JP3611015B2 - Method and apparatus for measuring optical properties of phosphor sample - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for measuring optical properties of a phosphor sample used in a display device or a fluorescent lamp.
[0002]
[Prior art]
Phosphors are widely used in the fields of various display devices such as CRT displays and plasma displays, and light source devices such as fluorescent lamps and mercury lamps.
[0003]
The characteristics of the phosphor used in these devices include the quantum efficiency of the phosphor when the phosphor is excited to emit light, the spectral characteristics of the fluorescence emission, the luminance characteristics of the light emitting surface, and the fluorescence when the phosphor is excited. Optical characteristics such as emission rise time characteristics, phosphor reflection, and transmission characteristics are important.
[0004]
Among these characteristics, the luminance characteristic indicating how bright the phosphor emits light is particularly important.
[0005]
Conventionally, the luminance characteristics of phosphors are measured by irradiating the phosphor with excitation light of a specific wavelength and specific intensity to measure the luminance (or radiance) in a specific direction and comparing it with a standard phosphor with a known luminance. Or by directly measuring with a luminance meter.
[0006]
[Problems to be solved by the invention]
Conventionally, however, it measures the luminance characteristics when the phosphor is irradiated with excitation light from a specific direction. When the phosphor layer is thin, the luminance depends on the irradiation direction of the excitation light and the light receiving direction for measuring the luminance. (For example, A. Bernes et al .: Fluorescent quantum efficiency, JOSA Vol. 54, 747 (1964)).
[0007]
FIG. 6 qualitatively shows how the luminance distribution and the transmitted light distribution of the fluorescence emission are when the phosphor 31 is applied to the glass surface and the excitation light is irradiated from the direction perpendicular to the phosphor surface. Is.
[0008]
6A shows the transmission luminance characteristic, and FIG. 6B shows the transmission characteristic.
[0009]
The luminance characteristic varies depending on the coating weight per unit area of the phosphor 31, that is, the film thickness. The transmission luminance characteristic when the film thickness is large has a distribution as indicated by a1, and when the film thickness is small, it is indicated by a2. Distribution.
[0010]
Further, the transmittance characteristic when the film thickness is thick has a distribution as shown by b1, and when the film thickness is thin, the distribution becomes as shown by b2.
[0011]
For this reason, for example, when the luminance of the phosphor surface is measured from a direction perpendicular to the surface, the measured value of the luminance is different when measured from a direction of 45 degrees to the surface.
[0012]
This phenomenon is remarkable when the thickness of the applied phosphor is thin and the transmittance is low.
[0013]
Therefore, when measuring the luminance of the phosphor surface on the excitation light side (hereinafter referred to as “diffuse reflection luminance”) and the luminance of the phosphor surface opposite to the excitation light side (hereinafter referred to as “diffuse transmission luminance”). Needs to be measured in accordance with the purpose, and when the amount of light emission becomes a problem, it is necessary to measure the luminance integrated in each direction by a method such as placing an integrating sphere on the light receiving surface side.
[0014]
In addition, in a fluorescent lamp, ultraviolet radiation mainly having a wavelength of 254 nm that excites the phosphor is diffused light. Therefore, when an attempt is made to appropriately evaluate the luminance characteristics of the phosphor used in the fluorescent lamp, diffused excitation light is applied to the phosphor surface. It is necessary to measure the luminance characteristics after irradiation.
[0015]
However, a simple measuring method and measuring apparatus for this purpose have not yet been put into practical use.
[0016]
The present invention solves the above-described problems and provides a phosphor sample that can easily measure optical properties such as diffuse transmission luminance, diffuse reflection luminance, and the sum of diffuse transmission luminance and diffuse reflection luminance of the phosphor sample. An object is to provide an optical characteristic measuring apparatus.
[0017]
[Means for Solving the Problems]
The phosphor optical property measuring apparatus of the present invention is characterized in that the means for measuring the optical properties of the phosphor sample has a special configuration.
[0018]
According to the present invention, the optical characteristics of the phosphor sample can be easily obtained.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
The optical property measuring apparatus for a phosphor sample according to claim 1 comprises:Visual radiation and ultraviolet radiation that excites phosphorsA light source unit that can radiate and independently extract and project one of these, and ultraviolet radiation and visible radiation from the light source unit.DiffuseA first integrating sphere, a first light receiving unit for measuring an inner wall illuminance of the first integrating sphere, and the first integrating sphere;Diffused byUV or visible radiationIn the position to receiveThe sample mounting portion for holding the phosphor sample has the same inner diameter and inner surface reflectance as the first integrating sphere, and captures the fluorescence emission on the opposite side of the excitation light projection side of the fluorescence emission of the phosphor. A phosphor sample optical property measuring apparatus comprising: a second integrating sphere; a second light receiving unit for measuring an inner wall illuminance of the second integrating sphere; and a computing unit. Arithmetic unit, a certain amount of visible radiation F₀ To the first integrating sphereWhen put,Measured value M obtained by measuring the inner wall illuminance of the first integrating sphere and the second integrating sphere with the first light receiving unit and the second light receiving unit, respectively.₁₀, M₂₀And a certain amount of ultraviolet radiation P in the first integrating sphere₀Measured value M obtained by measuring the inner wall illuminance of the first integrating sphere and the second integrating sphere when the phosphor is excited and measuring the first and second integrating spheres, respectively.₁, M₂And these measured values M₁₀, M₂₀, M₁, M₂Based on the above, at least one of the diffuse transmission luminance, the diffuse reflection luminance, and the sum of the diffuse transmission luminance and the diffuse reflection luminance of the phosphor sample is obtained.
[0020]
The optical property measuring apparatus for a phosphor sample according to claim 2 is the following, when the opening area through which the radiation projected from the first integrating sphere to the phosphor sample is passed is S in claim 1. It is characterized in that the diffuse transmission luminance Lt of the phosphor sample is obtained from [Equation 1].
[0021]
[Equation 9]
[0022]
The optical property measuring apparatus for a phosphor sample according to claim 3 is the optical sample measuring apparatus according to claim 1, in which, in S 1, when the opening area through which the radiation projected from the first integrating sphere to the phosphor sample passes is S, The present invention is characterized in that the diffuse reflection luminance Lr of the phosphor sample is obtained by [Expression 2].
[0023]
[Expression 10]
[0024]
According to a fourth aspect of the present invention, there is provided the optical property measuring apparatus for a phosphor sample according to the first aspect, wherein when the opening area through which the radiation projected from the first integrating sphere is transmitted to the phosphor sample is S, [Equation 3] and diffuse reflection luminance Lr of the phosphor sample and diffusionTransparentThe present invention is characterized in that the sum Lrt of the luminance Lt is obtained.
[0025]
[Expression 11]
[0026]
According to a fifth aspect of the present invention, there is provided the optical property measuring apparatus for a phosphor sample according to the first aspect, wherein the calculation unit includes the diffuse transmission luminance Lt and the diffuse reflection luminance Lr of the phosphor sample whose diffuse reflection luminance Lr is known from The sum Lrt is obtained.
[0027]
[Expression 12]
[0028]
An optical property measuring apparatus for a phosphor sample according to claim 6 is the calculation unit according to claim 1, configured to obtain the diffuse transmission luminance Lt of the phosphor sample whose diffuse reflection luminance Lr is known by the following [Equation 5]: It is characterized in that the diffuse reflection luminance and diffuse transmission luminance for obtaining the device constant K of the following [Equation 5] are composed of a known standard phosphor.
[0029]
[Formula 13]
[0030]
The optical property measuring apparatus for a phosphor sample according to claim 7 according to any one of claims 1 to 6, wherein a light source that emits at least ultraviolet radiation and visible radiation as a light source of the light source unit, an optical filter,Multi-layer coating appliedA spectroscopic means selected from the group of an optical mirror and a diffraction grating is used in combination.
[0031]
According to an eighth aspect of the present invention, there is provided the optical property measuring apparatus for a phosphor sample according to the seventh aspect, wherein a xenon lamp is used as the light source.
[0032]
The optical property measuring apparatus for a phosphor sample according to claim 9 is the optical material measuring device according to any one of claims 1 to 6, wherein the light source unit is a light source that emits ultraviolet radiation, a light source that emits visible radiation, and an optical source. Filter andMulti-layer coating appliedA spectroscopic means selected from the group of an optical mirror and a diffraction grating is combined.
[0033]
The optical property measuring apparatus for a phosphor sample according to claim 10 includes, in any one of claims 1 to 6, a means for measuring ultraviolet radiation and visible radiation projected from the light source section onto the integrating sphere. It is characterized by that.
[0036]
Claim11The optical property measuring apparatus for a phosphor sample described in claim 2 determines the luminous flux divergence Mt on the diffuse transmission luminance surface of the phosphor sample by using the following [Formula 1 ′] instead of [Formula 1]. It is characterized by.
[0037]
[Expression 15]
[0038]
Claim12The optical property measuring apparatus for a phosphor sample described in claim 1 obtains the luminous flux divergence Mr of the diffuse reflection luminance surface of the phosphor sample by using the following [Expression 2 ′] instead of [Expression 2]. It is characterized by.
[0039]
[Expression 16]
[0040]
Claim13The method for measuring the optical properties of the phosphor samples described is for ultraviolet radiation and visible radiation.Diffuse radiationThe first integrating sphere, the second integrating sphere having the same inner diameter and inner surface reflectance as the first integrating sphere, and capturing the fluorescence emission on the side opposite to the excitation light projection side of the fluorescence emission of the phosphor. And, Through the sample mounting portion for mounting the phosphor sample, and connected so that the sample mounting portion is located at a position that receives ultraviolet radiation or visible radiation diffused and emitted by the first integrating sphere,A fixed amount of visible radiation F on the first integrating sphere₀And the inner wall surface illuminance of the first integrating sphere and the second integrating sphere is set to the first light receiving portion provided in the first integrating sphere and the second light receiving provided in the second integrating sphere. And measured value M₁₀, M₂₀A certain amount of ultraviolet radiation P in the first integrating sphere₀The inner wall surface illuminance of the first integrating sphere and the second integrating sphere when the phosphor is excited with the first and second integrating spheres measured by the first light receiving unit and the second light receiving unit.₁, M₂These measured values M₁₀, M₂₀, M₁, M₂Based on the above, at least one of the diffuse transmission luminance, the diffuse reflection luminance, and the sum of the diffuse transmission luminance and the diffuse reflection luminance of the phosphor sample is obtained.
[0041]
Each embodiment of the present invention will be described below with reference to FIGS.
[0042]
(Embodiment 1)
1 to 3 show (Embodiment 1) of the present invention.
[0043]
Unlike the conventional optical characteristic measuring apparatus, in this (Embodiment 1), the first integrating sphere is used to generate diffusion excitation light, and this diffusion excitation light is applied to a phosphor coated on a glass substrate. The optical characteristic measuring device is configured to generate fluorescent light emission and integrate the components in each direction of the fluorescent light emission by a second integrating sphere to obtain the luminance of the phosphor sample.
[0044]
Details are described below.
[0045]
FIG. 1 shows an apparatus for measuring optical properties of a phosphor sample.
[0046]
As shown in FIG. 1 (a), the first amount of ultraviolet radiation and visible radiation from the light source section 2 is measured via the sample mounting section 1 on which a phosphor sample 30 for measuring optical properties is mounted. Integrating sphere 3 and a second integrating sphere having the same inner diameter and inner surface reflectance as those of first integrating sphere 3 for capturing the fluorescence emission on the opposite side of the excitation light projection side of the fluorescence emission of the phosphor. 4 is connected.
[0047]
The phosphor sample 30 is mounted on the sample mounting unit 1, and ultraviolet radiation and visible radiation are supplied from the light source unit 2, and the optical characteristics of the phosphor sample 30 are measured.
[0048]
The light source unit 2 is configured to emit at least ultraviolet radiation and visible radiation that excite the phosphor, and any one of these can be independently extracted and projected.
[0049]
Specifically, the light source unit 2 includes, for example, an ultraviolet radiation source including a germicidal lamp 10 that emits ultraviolet radiation of 254 nm and a narrow-band optical filter 12 having a peak at 254 nm, a halogen lamp 11 and a visible light of 400 to 700 nm. And a visible radiation source composed of a broadband optical filter 13 that transmits radiation.
[0050]
The first integrating sphere 3 for measuring the amount of ultraviolet radiation and visible radiation from the light source section 2 is provided with a first light receiving section 5 for measuring the inner wall surface illuminance. The second integrating sphere 4 is provided with a second light receiving unit 6 for measuring the inner wall illuminance of the second integrating sphere 4.
[0051]
The first integrating sphere 3 applies diffuse radiation to the phosphor, and the second integrating sphere 4 is configured to integrate and receive light transmitted through the phosphor sample 30 and light with diffuse transmission luminance.
[0052]
The first light receiving unit 5, the second light receiving unit 6, and the light source unit 2 are connected to a calculation unit 7 for calculating an optical characteristic measurement value based on the measurement data. A display unit 8 for displaying and a storage unit 9 for storing measurement data and calculation results are provided.
[0053]
Further, a third light receiving unit 14 that measures the amount of visible radiation and ultraviolet radiation projected onto the first integrating sphere 3 is provided at the outlet of the light source unit 2.
[0054]
As shown in FIG. 1B, the third light receiving unit 14 is provided with an ultraviolet light receiver 17 for receiving ultraviolet radiation and a visible light receiver 16 for receiving visible radiation. The light receiver is rotated around the drive shaft 19 by the rotation driving means, and the light receiver can be selected and arranged corresponding to the type of radiation to be measured.
[0055]
Reference numeral 15 denotes an amplification / display unit 15 that amplifies and displays a signal from the light receiver 14 and adjusts the ultraviolet radiation and visible radiation output of the light source unit 2 to a certain constant value by looking at the output display value.
[0056]
Reference numeral 18 denotes an opening for guiding ultraviolet or visible radiation adjusted to a certain amount from the light source unit 2 to the first integrating sphere 3.
[0057]
In the optical property measuring apparatus configured as described above, when measuring the optical property of the phosphor sample 30, it is impossible to place a very thin phosphor on the sample mounting portion 1, so in actual measurement, A phosphor sample 30 in which a phosphor is coated on a thin glass substrate is prepared, and the optical characteristics of the phosphor sample 30 may be measured.
[0058]
In the optical property measuring apparatus for the phosphor sample 30 configured as described above, the calculation unit 7 is configured as follows.
[0059]
A phosphor sample 30 is mounted on the sample mounting portion 1 and a certain amount of visible radiation F is emitted from a visible radiation source composed of the halogen lamp 11 and the broadband filter 13 of the light source portion 2.₀, The inner wall surface illuminance of the first integrating sphere 3 and the second integrating sphere 4 is measured by the first light receiving unit 5 and the second light receiving unit 6 respectively, and the measured value M₁₀And M₂₀Ask for.
[0060]
Similarly, a certain amount of ultraviolet radiation P is emitted from an ultraviolet radiation source composed of the germicidal lamp 10 of the light source unit 2 and the narrow-band optical filter 12.₀, The inner wall surface illuminance of the first integrating sphere 3 and the second integrating sphere 4 is measured by the first light receiving unit 5 and the second light receiving unit 6 respectively, and the measured value M₁, M₂Ask for.
[0061]
Obtained measured value M₁₀, M₂₀, M₁, M₂Is sent to the calculation unit 7 and stored in the storage unit 9.
[0062]
And the measurement data F memorize | stored in the memory | storage part 9₀, M₁₀, M₂₀, M₁, M₂And the opening area S in the mounting portion of the phosphor sample 30 stored in advance is calculated by calling from the data calculation unit, and diffuse transmission luminance Lt, diffuse reflection luminance Lr, diffuse transmission luminance Lt, and diffuse reflection luminance Lr, One or more of the sums Lrt are obtained and displayed on the display unit 8.
[0063]
At this time, visible radiation F₀Is adjusted so as to be a certain amount when the output display of the visible light receiver 16 of the amplification / display unit 15 is viewed, and the ultraviolet radiation P₀This amount is adjusted to a certain fixed amount by looking at the output display of the ultraviolet light receiver 17 of the amplification / display unit 15.
[0064]
The amount of radiation is F₀And P₀In the adjustment, the electric input to the lamp may be finely adjusted or may be adjusted using a neutral density filter.
[0065]
Further, a metal interference filter was used as the narrow band optical filter 12 used in the light source unit 2, and a gelatin filter was used as the wide band optical filter 13.
[0066]
Further, as the visible light receiver 16 and the ultraviolet light receiver 17 of the light receiving unit 3, a silicon photodiode, a photomultiplier tube, a thermal detector, or the like was used.
[0067]
Further, in the above (Embodiment 1), an example in which the germicidal lamp 10, the halogen lamp 11, the narrow band optical filter 12, and the broadband optical filter 13 are used as the light source is shown, but the present invention is not limited to this. A light source that emits at least ultraviolet radiation and visible radiation as a light source of the light source unit and an optical filter such as a metal interference optical filter or a spectroscopic means such as an optical mirror coated with a multilayer film or a diffraction grating is used in combination. Any xenon lamp can be preferably used as the lamp serving as the light source.
[0068]
Alternatively, as the light source of the light source unit, a combination of at least a light source that emits ultraviolet radiation, a light source that emits at least visible radiation, and one or two spectroscopic means such as an optical filter, an optical mirror, or a diffraction grating is preferable. Can be used for
[0069]
Further, it is preferable to apply barium sulfate to the inner wall surfaces of the first integrating sphere 3 and the second integrating sphere 6.
Example 1
In the optical property measuring apparatus for a phosphor sample configured as described above, the diffuse transmission luminance Lt, the diffuse reflection luminance Lr, and the sum Lrt of the diffuse transmission luminance Lt and the diffuse reflection luminance Lr of the phosphor sample are as follows. Is required.
[0070]
FIGS. 2A and 2B are schematic views showing the main part of FIG. 1 showing the above (Embodiment 1).
[0071]
A first integrating sphere 3 and a second integrating sphere 4 are arranged above and below the sample mounting portion 1 of the phosphor sample 30 for measuring the optical characteristics, and the first integrating sphere 3 and the second integrating sphere 4 A first light receiving unit 5 and a second light receiving unit 6 are provided at the upper part of the light receiving window, respectively.
[0072]
The first integrating sphere 3 and the second integrating sphere 4 configured as described above have the same inner diameter and internal reflectance, and are considered to be optically equivalent.
[0073]
First, as shown in FIG. 2A, a sample phosphor is mounted on the sample mounting portion 1, and a certain amount of visible radiation F is applied to the first integrating sphere 3.₀(Lm), βF₀Is incident on the second integrating sphere 4.
[0074]
Here, β is an index for evaluating the light flux transmission amount from the first integrating sphere 3 to the second integrating sphere 4 when the phosphor sample 30 is mounted on the sample mounting portion 1.
[0075]
At this time, the outputs of the first light receiving unit 5 and the second light receiving unit 6 are respectively M₁₀, M₂₀In the case where the film thickness is small as in the case of a phosphor coating film such as a fluorescent lamp, the following [Expression 7] is approximately established.
[0076]
[Expression 17]
[0077]
Also figure2As shown in (b), when visible radiation of Fr (lm) is incident on the first integrating sphere 3 and Ft (lm) is incident on the second integrating sphere 4, the first integrating sphere 3 and the second integrating sphere 4 Output M₁, M₂Is represented by the following [Equation 8].
[0078]
[Expression 18]
[0079]
From above [Formula 8] to F₀Alternatively, when Fr is eliminated, the transmitted light flux Ft is expressed by the following [Equation 9].
[0080]
[Equation 19]
[0081]
FIG. 3 shows an integrating sphere having the same shape and the same optical characteristics as the first integrating sphere 3 and the second integrating sphere 4, which are configured in the same manner as FIGS.
[0082]
A certain amount of ultraviolet radiation P in the first integrating sphere 3₀For example, when radiation of 254 nm is entered, the reflected light beam Fr to the first integrating sphere 3 and the transmitted light beam Ft to the second integrating sphere 4 by this phosphor are expressed by the following [Equation 10].
[0083]
[Expression 20]
[0084]
From the above [Expression 9] and [Expression 10], the diffuse transmission luminance Lt of the sample phosphor is as shown in [Expression 11] below.
[0085]
[Expression 21]
[0086]
Therefore, the measurement data F stored in the storage unit 9₀, M₁₀, M₂₀, M₁, M₂Then, the value of the diffuse transmission luminance Lt is obtained by calling the phosphor sample 30 mounting portion opening area S stored in advance from the data calculation unit and calculating based on the above [Expression 1]. The value is displayed in.
[0087]
[Expression 22]
[0088]
Further, the diffuse reflection luminance Lr of the phosphor sample 30 is obtained by the following [Expression 2] obtained by modifying the above [Expression 11].
[0089]
[Expression 23]
[0090]
Further, the sum Lrt of the diffuse transmission luminance Lt and the diffuse reflection luminance Lr is obtained by the following [Expression 3] obtained from [Expression 1] and [Expression 2].
[0091]
[Expression 24]
[0092]
Example 2
In the first embodiment, the case where any of the diffuse transmission luminance Lt, the diffuse reflection luminance Lr, and the sum Lrt of the diffuse transmission luminance Lt and the diffuse reflection luminance Lr has been described is described. In the second embodiment, the diffuse reflection luminance is used. A case where a phosphor sample 30 having a known Lr is used will be described.
[0093]
Measured value M as in Example 1 above₁₀, M₂₀, M₁, M₂Ask for.
[0094]
The sum Lrt of the diffuse transmission luminance Lt and the diffuse reflection luminance Lr is obtained by the following [Expression 4] obtained from the above [Expression 9].
[0095]
[Expression 25]
[0096]
Further, the diffuse transmission luminance Lt is obtained by the following [Equation 5].
[0097]
[Equation 26]
[0098]
The above [Formula 5] is obtained by the following procedure.
[0099]
In FIG. 2A described above, the visible radiation F appears on the first integrating sphere 3.₀When (1m) is inserted, βF₀Is incident on the second integrating sphere 4. The output of the first light receiving unit 5 at this time is M₁₀The output of the second light receiving unit 6 is M₂₀Then, the following [Equation 12] is established as in the first embodiment.
[0100]
[Expression 27]
[0101]
Now, a sample phosphor having a diffuse reflection luminance of Lr and a diffuse transmission luminance of Lt is placed on the sample mounting portion 1, and ultraviolet radiation, for example, 254 nm radiation that excites the phosphor instead of visible radiation is emitted to the second integrating sphere 4. The output of the second light receiving unit 6 corresponding to the diffuse transmission luminance Lt is M₂Then, M₂Is approximately given by
[0102]
[Expression 28]
[0103]
Therefore, if K is known for the measuring device and Lr of the sample phosphor is known, M₁₀, M₂₀, M₁, M₂Is obtained, the diffuse transmission luminance Lt of the measurement sample is obtained by the following [Equation 14].
[0104]
[Expression 29]
[0105]
The constant K for the measuring device is obtained by performing the following calibration operation of the measuring device.
[0106]
A certain amount of radiation F from a visible radiation source comprising the halogen lamp 11 of the light source unit 2 and a broadband optical filter that transmits the visible region of 400-700 nm.₀Is adjusted while looking at the output display of the visible light receiver 16 so that is projected onto the integrating sphere 1.
[0107]
And the diffuse reflection luminance and the diffuse transmission luminance are each known Lr_(Ref)And Lt_(Ref)The light receiving unit output M of the first integrating sphere 3 and the second integrating sphere 4 for visible radiation using a standard phosphor that is_{10 (ref)}, M_{20 (ref)}Measure.
[0108]
This data is sent to the calculation unit 7 and the following [Expression15], An index β (ref) representing the amount of transmitted light from the first integrating sphere 3 to the second integrating sphere 4 is obtained, and this data is sent to the storage unit 9 for storage.
[0109]
Next, the light source and the filter are moved so that the ultraviolet radiation can be supplied to the first integrating sphere 3 from the ultraviolet radiation source composed of the germicidal lamp 10 and the narrow-band optical filter 12.
[0110]
And the amount of ultraviolet radiation is a certain amount P₀The output M corresponding to the illuminance on the inner wall surface of the second integrating sphere 4 is adjusted by the second light receiving unit 6 while viewing the output display of the ultraviolet light receiver 17._{2 (ref)}Is sent to the calculation unit 7.
[0111]
Here, M measured earlier_{10 (ref)}And M_{20 (ref)}The device constant K is obtained as shown in [Equation 15] below. This completes the calibration work.
[0112]
[30]
[0113]
(Embodiment 2)
FIG. 4 shows (Embodiment 2) of the present invention.
[0114]
This (Embodiment 2) differs from the above (Embodiment 1) in that the configuration of the light source unit 2a is special, but the other configuration is substantially the same as the above (Embodiment 1).
[0115]
Specifically, the light source unit 2a emits both a xenon lamp 20 as a light source that emits both ultraviolet radiation and visible radiation, a narrow-band optical filter 22 having a peak at 254 nm as an optical filter, and visible radiation in the range of 400 to 700 nm. A transmitting broadband optical filter 23 is used. Reference numeral 21 denotes a lighting control device for the xenon lamp 20.
[0116]
A narrow band optical filter 22 can be selected and arranged through the rotary drive mechanism 24 when it is desired to put ultraviolet radiation for exciting the phosphor into the first integrating sphere 3 and visible radiation can be put into the first integrating sphere 3. It is configured as follows.
[0117]
Reference numeral 25 denotes a light receiver having sensitivity in the ultraviolet region and the visible region for measuring the amount of radiation projected from the light source unit 2a onto the first integrating sphere 3, and reference numeral 26 denotes an amplification signal of the signal from the light receiver 25. It is a display unit.
[0118]
As the light receiver 25, for example, a silicon photodiode can be used.
[0119]
The amount of ultraviolet radiation projected onto the first integrating sphere 3 is a certain constant value P₀Adjustment for achieving the above is performed by the lighting control device 21 of the xenon lamp 20. Also, certain visible radiation F₀Is also performed by the lighting control device 21 in the same manner.
[0120]
In the phosphor sample optical characteristic apparatus configured as described above, a certain amount of visible radiation F₀Or a certain amount of ultraviolet radiation P₀Into the first integrating sphere 3, and the measured value M in the first light receiving unit 5 and the second light receiving unit 6.₁₀, M₂₀, M₁, M₂To obtain these measured values M₁₀, M₂₀, M₁, M₂The procedure for obtaining the diffuse transmission luminance Lt, the diffuse reflection luminance Lr, and the sum Lrt of the diffuse transmission luminance and the diffuse reflection luminance of the phosphor sample 30 based on the above is the same as the above (Embodiment 1).
[0121]
In the above (Embodiment 2), an example is shown in which the xenon lamp 20 and the optical filter are used as the light source of the light source unit 2a. However, the present invention is not limited to this, and at least ultraviolet radiation and visible light are used. A light source that emits radiation and an optical filter such as a metal interference optical filter or a spectroscopic means such as an optical mirror or a diffraction grating coated with a multilayer film can be used in combination.
[0122]
In the above (Embodiment 2), the narrow band optical filter 22 and the wide band filter 23 are replaced with each other through the rotation drive mechanism 24. However, the present invention is not limited to this, and the rotation drive is performed. For example, a slide rail or the like may be used instead of the mechanism 24.
[0123]
(Embodiment 3)
FIG. 5 shows (Embodiment 3) of the present invention.
[0124]
This (Embodiment 3) differs from FIG. 1 in that the configuration of the light source unit 2b is special in order to obtain the transmittance of the phosphor sample 30, but the basic configuration other than that is as described above (Embodiment 3). It is almost the same as the first embodiment.
[0125]
A visible radiation source 27 in the range of 400 to 700 nm is placed in the light source unit 2b, and a lighting control device 28 for adjusting the output thereof is provided. Reference numeral 29 denotes a filter mounting means that allows a narrow band optical filter to be disposed when it is desired to know the wavelength characteristic of the transmittance of the phosphor.
[0126]
The transmittance is usually measured without a filter.
[0127]
That is, a certain amount of visible radiation F present in the first integrating sphere 3 in a state where the phosphor sample 30 is not mounted on the sample mounting portion 1.₀The inner wall illuminance of the first integrating sphere 3 and the second integrating sphere 4 when the first light receiving portion is inserted is measured by the first light receiving portion 5 and the second light receiving portion 6 respectively, and the measured value M₁₀₀, M₂₀₀Ask for.
[0128]
This data is sent to the calculation unit, and β₀₀And this β₀₀Are stored in the storage unit 9.
[0129]
Next, a phosphor sample 30 whose transmittance T is to be measured is placed on the sample mounting portion 1, and a certain amount of visible radiation F₀The inner wall illuminance of the first integrating sphere 3 and the second integrating sphere 4 when the first light receiving portion is inserted is measured by the first light receiving portion 5 and the second light receiving portion 6 respectively, and the measured value M₁₀, M₂₀Ask for.
[0130]
Similarly, this data is sent to the calculation unit and β₀And this β₀Are stored in the storage unit 9.
[0131]
Next, measurement data M from the storage unit₂₀, M₂₀₀And the calculation result β₀And β₀₀And the transmittance of the phosphor sample 30 is calculated based on [Equation 6], and the value is displayed on the display unit 8.
[0132]
[31]
[0133]
Here, T is the transmittance of the phosphor.
[0134]
In the measurement of the transmittance, since it is the ratio of the amount of light transmitted through the phosphor sample 30, the absolute amount of visible radiation F₀There is no meaning in itself, and it may be held at a constant value. For this purpose, monitoring may be performed so that the output of the first light receiving unit 5 of the first integrating sphere 3 is constant.
[0135]
In addition, when it is desired to obtain the transmittance Tp of the phosphor itself from the diffuse transmittance data of the phosphor sample 30 in which the phosphor is coated on the glass substrate, the diffuse reflectance of the phosphor sample 30 and the base glass and the base glass It is only necessary to measure the transmittance of and to obtain Tp by calculation.
[0136]
(Embodiment 4)
In the above (Embodiment 1), if the algorithm of the following [Equation 1 ′] is used instead of [Equation 1], the luminous flux divergence Mt on the diffuse transmission luminance surface is changed instead of the diffuse transmission luminance Lt of the phosphor sample 30. Desired.
[0137]
[Expression 32]
[0138]
Similarly, if the algorithm of the following [Equation 2 '] is used instead of [Equation 2], the luminous flux divergence Mr of the diffuse reflection luminance surface Lr of the phosphor sample 30 can be obtained.
[0139]
[Expression 33]
[0140]
In the above (Embodiment 1), the phosphor sample optical property measuring apparatus in which each of the calculation unit 7, the display unit 8, and the storage unit 9 is controlled by the control unit is used. The measurement value M is not limited, and the measurement value M is the same as described above by using the measurement device from which the calculation unit 7 and the storage unit 9 are removed.₁₀, M₂₀, M₁, M₂To obtain these measured values M₁₀, M₂₀, M₁, M₂Based on the above, at least one of diffuse transmission luminance, diffuse reflection luminance, and the sum of diffuse transmission luminance and diffuse reflection luminance of the phosphor sample 30 may be obtained by manual calculation.
[0141]
【The invention's effect】
As described above, by using the phosphor sample optical property measuring apparatus of the present invention, it is possible to easily measure optical characteristics such as diffuse transmission luminance and diffuse reflection luminance when the phosphor sample is irradiated with diffuse excitation light. Can do.
[0142]
In particular, a luminance meter measures the emission luminance and diffuse transmission luminance when the fluorescent light emission surface is off the complete diffusion surface when the fluorescent material is excited, such as when the fluorescent material is thinly applied to the glass tube of a fluorescent lamp. Even in this case, it is possible to measure with higher accuracy than in the past.
[0143]
This is particularly effective when the amount of radiation from the light emitting surface is more important than the luminance in the specific direction of the fluorescent light emitting surface.
[0144]
Further, the diffuse transmission luminance, the diffuse reflection luminance, or the sum of the diffuse transmission luminance and the diffuse reflection luminance can be measured with the same physical configuration and only by changing the algorithm of the measurement data calculation process.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of an optical property measuring apparatus for a phosphor sample in (Embodiment 1).
FIG. 2 is a schematic diagram of an optical property measuring apparatus for a phosphor sample in (Embodiment 2).
FIG. 3 is a schematic diagram of an optical property measuring apparatus for a phosphor sample in (Embodiment 3).
FIG. 4 is a schematic diagram showing the main part of FIG. 1 in (Embodiment 1).
5 is a schematic diagram showing the main part of FIG.
FIG. 6 is a schematic diagram showing how the luminance distribution and transmitted light distribution of phosphor emission are changed.
[Explanation of symbols]
1 Sample mounting part
2 Light source
3 First integrating sphere
4 Second integrating sphere
5 1st light-receiving part
6 Second light receiving section
7 Calculation unit
8 Display section
9 Memory part

Claims (13)

A light source unit that emits visible radiation and ultraviolet radiation that excites a phosphor, and can independently take out and project one of them,
A first integrating sphere that diffuses and emits ultraviolet radiation and visible radiation from the light source section;
A first light receiving unit for measuring the inner wall illuminance of the first integrating sphere;
A sample mounting part for holding a phosphor sample at a position where it receives ultraviolet radiation or visible radiation diffused by the first integrating sphere;
An inner diameter and an inner surface reflectance are the same as those of the first integrating sphere, and a second integrating sphere for capturing the fluorescence emission on the side opposite to the excitation light projection side of the fluorescence emission of the phosphor;
A second light receiving unit for measuring the inner wall illuminance of the second integrating sphere;
An optical property measuring device for a phosphor sample composed of an arithmetic unit,
The computing unit is
Measure the inner wall illuminance of the first integrating sphere and the second integrating sphere when a certain amount of visible radiation F ₀ is put in the first integrating sphere with the first light receiving unit and the second light receiving unit, respectively. Measured values M ₁₀ and M ₂₀ obtained by
The first light receiving unit and the second light receiving unit represent the inner wall illuminance of the first integrating sphere and the second integrating sphere when a certain amount of ultraviolet radiation P ₀ is put in the first integrating sphere to excite the phosphor. Measured values M ₁ and M ₂ respectively obtained by measuring with
Based on these measured values M ₁₀ , M ₂₀ , M ₁ and M ₂ , at least _one of the diffuse transmission luminance, the diffuse reflection luminance, and the sum of the diffuse transmission luminance and the diffuse reflection luminance of the phosphor sample is obtained. An optical property measuring apparatus for a phosphor sample configured as described above. The calculation unit is configured to obtain the diffuse transmission luminance Lt of the phosphor sample by the following [Equation 1], where S is an opening area through which radiation projected from the first integrating sphere to the phosphor sample passes. 1. The optical property measuring apparatus for a phosphor sample according to 1.
The calculation unit is configured to obtain the diffuse reflection luminance Lr of the phosphor sample according to the following [Equation 2], where S is an opening area through which radiation projected from the first integrating sphere to the phosphor sample passes. 1. The optical property measuring apparatus for a phosphor sample according to 1.
When the opening area through which the radiation projected from the first integrating sphere to the phosphor sample passes is S, the sum of the diffuse reflection luminance Lr and the diffuse transmission luminance Lt of the phosphor sample is expressed by the following [Equation 3]. 2. The optical property measuring apparatus for a phosphor sample according to claim 1, wherein Lrt is obtained.
2. The optical characteristic measurement of a phosphor sample according to claim 1, wherein the calculation unit is configured to obtain a sum Lrt of the diffuse transmission luminance Lt and the diffuse reflection luminance Lr of the phosphor sample whose diffuse reflection luminance Lr is known by the following [Equation 4]. apparatus.
An arithmetic unit configured to obtain the diffuse transmission luminance Lt of a phosphor sample having a known diffuse reflection luminance Lr according to the following [Equation 5], and the diffuse reflection luminance and diffuse transmission luminance for obtaining the device constant K of the following [Equation 5]. 2. The phosphor sample optical property measuring apparatus according to claim 1, wherein said phosphor sample comprises a known standard phosphor.
Where K is the diffuse reflection luminance Lr _(ref) and diffuse transmission luminance L known for the standard phosphor.
An apparatus determined by using the above [Expression 5] from t _(ref) and M _{10 (ref)} , M _{20 (ref)} , and M _{2 (ref)} measured using this apparatus for this standard phosphor. It is a constant. 2. A light source that emits at least ultraviolet radiation and visible radiation as a light source of the light source section, and a spectroscopic means selected from the group consisting of an optical filter, an optical mirror coated with a multilayer film, and a diffraction grating are used in combination. The optical property measuring apparatus for a phosphor sample according to claim 6. The apparatus for measuring optical characteristics of a phosphor sample according to claim 7, wherein a xenon lamp is used as the light source. As a light source of the light source section,
6. A light source that emits ultraviolet radiation, a light source that emits visible radiation, and a spectroscopic means selected from the group consisting of an optical filter, an optical mirror coated with a multilayer film, and a diffraction grating. An optical property measuring apparatus for a phosphor sample according to any one of the above. The optical property measuring apparatus for a phosphor sample according to any one of claims 1 to 6, wherein means for measuring ultraviolet radiation and visible radiation projected from the light source section onto the integrating sphere are incorporated in the light source section. The optical property measurement apparatus for a phosphor sample according to claim 2, wherein the luminous flux divergence Mt on the diffuse transmission luminance surface of the phosphor sample is obtained by using the following [Expression 1 '] instead of [Expression 1].
The apparatus for measuring optical characteristics of a phosphor sample according to claim 1, wherein the luminous intensity Mr of the diffuse reflection luminance surface of the phosphor sample is obtained by using the following [Expression 2 '] instead of [Expression 2].
The first integrating sphere that diffuses and emits ultraviolet radiation and visible radiation, the inner diameter and the internal reflectance are the same as those of the first integrating sphere, and the fluorescence on the opposite side to the excitation light projection side of the fluorescence emission of the phosphor A second integrating sphere that captures luminescence is passed through a sample mounting portion for mounting a phosphor sample, and the sample is received at a position that receives ultraviolet radiation or visible radiation diffused by the first integrating sphere. Connect so that the mounting part is located,
A first amount of visible radiation F ₀ is put in the first integrating sphere, and the inner wall surface illuminance of the first integrating sphere and the second integrating sphere is set to the first light receiving unit provided in the first integrating sphere, and Measurements M ₁₀ and M ₂₀ are respectively obtained by measurement with a second light receiving unit provided in the second integrating sphere,
Illumination of the inner wall surface of the first integrating sphere and the second integrating sphere when the phosphor is excited by inserting a certain amount of ultraviolet radiation P ₀ into the first integrating sphere is used for the first light receiving unit and the second light receiving unit. To measure the measured values M ₁ and M ₂ respectively,
Based on these measured values M ₁₀ , M ₂₀ , M ₁ , M ₂ , at least _one of the diffuse transmission luminance, the diffuse reflection luminance, and the sum of the diffuse transmission luminance and the diffuse reflection luminance of the phosphor sample is obtained. A method for measuring optical properties of a phosphor sample.