CN201875453U - High-CRI (color rendering index) high-lighting effect LED (light-emitting diode) bulb - Google Patents

Abstract

The utility model discloses an LED bulb lamp with high color rendering index and high luminous efficiency, which makes up for the deficiencies of the existing technology. The module consists of several white LEDs with YAG phosphors excited by blue light, white LEDs with nitride red phosphors added to a little YAG phosphors, and a little red LEDs packaged on aluminum substrates or metal conductive epoxy PCB boards; blue light stimulates YAG For white LEDs with phosphor, the peak wavelength of blue light is 455±5nm, and the half-width of the spectrum is 25±5nm; the emission peak wavelength of YAG phosphor is 570±10nm, and the half-width of the spectrum is 150±10nm. For white LEDs with nitride red phosphors added to YAG phosphors, the peak wavelength of blue light is 455±5nm, and the spectral half-width is 25±5nm; the emission peak wavelength of YAG phosphors is 570±10nm, and the spectral half-width is 150±10nm; The emission peak wavelength of the nitride red phosphor is 635±10nm, and the half-width of the spectrum is 50±5nm; the peak wavelength of the red LED is 640±10nm, and the half-width of the spectrum is 22±5nm. By adopting different numbers of LEDs, the color rendering index and luminous efficacy of the LED bulb lamp can be relatively ideal, and can be widely used in various lighting occasions.

Description

A high color rendering index and high light efficiency LED bulb lamp

technical field

The utility model relates to LED lighting technology, in particular to an LED bulb lamp with high color rendering index and high light efficiency and a preparation method thereof.

Background technique

In recent years, in the field of lighting, more and more attention has been paid to energy-saving and environment-friendly lamps, especially LED lighting lamps. LED lighting fixtures have gradually entered people's field of vision due to their long life, stable structure, power saving, no ultraviolet radiation, strong plasticity of lamps, and more beautiful decoration. They are regarded as the fourth generation of lighting sources that replace traditional lighting sources.

With the continuous advancement of LED technology, white LEDs have made great progress in light efficiency, lifespan and cost control, and their application in various lighting fields has been realized. As the best choice to replace incandescent lamps, LED ball running lights can be used in home lighting, school lighting, bar lighting, office lighting, corridor lighting, etc., and its effect is very obvious.

The color rendering index (Ra) of the light source describes the degree to which the light source presents the true color of the object, and the luminous efficacy (η _v ) describes the ability of the light source to convert electrical energy into light energy. Therefore Ra and η _v are two important parameters to evaluate the performance of LED light source.

At present, the existing LED running lights on the market mostly use blue light to excite white light LEDs with YAG phosphor powder in their light-emitting modules. Meet high-quality lighting requirements. There are also LEDs that add a small amount of sulfide red phosphor powder to YAG phosphor powder. Although this type of LED has a high color rendering index, its light efficiency is reduced, and its life is affected by the erosion of sulfide on the LED chip, which also cannot meet the lighting requirements. . Another LED uses nitride red phosphor powder added to YAG phosphor powder. Although the light efficiency and color rendering index of this LED are relatively ideal, the preparation of nitride phosphor powder is difficult and expensive, which greatly increases the cost of this LED. It is widely used in LED lamps. Therefore, there is an urgent need for an LED bulb lamp that is easy to implement, can meet the requirements of various lighting occasions for color rendering index, has high luminous efficiency, and is relatively affordable.

Contents of the invention

The purpose of the utility model is to provide a LED bulb lamp with high color rendering index and high luminous efficiency, so as to make up for the above-mentioned deficiencies in the prior art.

In order to realize the purpose of this utility model, adopt following technology:

An LED bulb lamp with high color rendering index and high luminous efficiency, its structure includes a lamp housing, an LED light-emitting module, a heat sink, a driving power supply, a lamp body, and a lamp holder. White LEDs, white LEDs with nitride red phosphors added to a little YAG phosphor powder, and a little red LEDs are packaged on aluminum substrates or metal conductive epoxy PCB boards. By setting the number of different LEDs used, the required differences can be obtained. Color temperature, color rendering index and light effect of LED bulbs, so as to get more ideal results.

The blue light excites the white light LED of YAG phosphor powder, the blue light peak wavelength is 455±5nm, and the spectral half width is 25±5nm; the emission peak wavelength of the YAG phosphor powder is 570±10nm, and the spectral half width is 150±10nm.

In the white LED with nitride red phosphor powder added to the YAG phosphor powder, the blue light peak wavelength is 450±5nm, and the spectral half-width is 25±5nm; the emission peak wavelength of the YAG phosphor powder is 570±10nm, and the spectral half-width is 150±5nm. 10nm; the emission peak wavelength of the nitride red phosphor is 635±10nm, and the spectral half-width is 50±5nm.

The red light LED has a red light peak wavelength of 640±10nm and a spectral half-width of 22±5nm.

The LED primary color spectrum selection formula is as follows:

S _LED (λ, λ ₀ , Δλ _0.5 )={g(λ, λ ₀ , Δλ _0.5 )+2·g ⁵ (λ, λ ₀ , Δλ _0.5 )}/3  …(1)

λ₀为峰值波长，Δλ_0.5光谱半宽。in,

λ ₀ is the peak wavelength, and Δλ _0.5 is the half-width of the spectrum.

The spectral distribution of the white light LED of the above-mentioned blue light exciting YAG phosphor powder is represented by the following formula:

S ₁ (λ)＝k _blue S _LED (λ, 455, 25)+k _YAG S _LED (λ, 570, 150)  …(2)

Among them, k _blue and k _YAG are the proportional coefficients of the blue light peak and the yellow light peak, respectively.

The spectral distribution of the white LED with nitride red phosphor added to the above YAG phosphor is represented by the following formula:

S ₂ (λ)＝k _blue-2 S _LED (λ, 455, 25)+k _YAG-2 S _LED (λ, 570, 150)+k _N-red S _LED (λ, 635, 50) ......(3)

Among them, k _blue-2 , k _YAG-2 and k _N-red are proportional coefficients among the blue light peak, yellow light peak and red light peak, respectively.

The spectral distribution of the above-mentioned red LED is represented by the following formula:

S ₃ (λ) = S _LED (λ, 640, 22) ... (4)

From the formulas (2), (3), and (4), and according to the number of three different LEDs used, the spectral distribution results of the three LEDs after light mixing can be obtained:

S _total (λ)=k ₁ ·S ₁ (λ)+k ₂ ·S ₂ (λ)+k ₃ ·S ₃ (λ) ...(5)

Among them, _k1 is the number of white light LEDs using YAG phosphor powder excited by blue light, _k2 is the number of white light LEDs using nitride red phosphor powder in the above YAG phosphor powder, and _k3 is the number of red light LEDs used above. . By normalizing formula (5), the relative spectral power distribution of the mixed diffuse reflection light finally emitted from the lamp housing can be obtained.

The LED light-emitting module is formed by packaging the above three kinds of LEDs on an aluminum substrate or a metal conductive epoxy PCB board. The three kinds of LEDs emit light respectively and mix light in the lamp housing, and then emit mixed diffuse reflection light from the lamp housing. Among them, 4 to 20 blue light-excited white LEDs with YAG phosphors are distributed on the periphery, 1 to 8 white LEDs with nitride red phosphors added to YAG phosphors and 1 to 8 red LEDs are interlaced on the aluminum substrate or metal conductive ring. Oxygen in the center of the PCB board.

The LED light-emitting module is placed on the top of the heat sink, and the top of the heat sink is connected with the lamp housing at the same time, and the lower part of the heat sink is connected with the lamp body loaded with the driving power and connected to the lamp cap. The lamp housing is a milky white plastic lamp housing or a milky white glass lamp housing.

Adopt above-mentioned technical scheme, it is characterized in that:

1. Choose a white light LED and a little red light LED that add nitride red phosphor powder to a little YAG phosphor powder. The color rendering index of white LEDs that only use blue light to excite YAG phosphors is not ideal; adding pure red LEDs to white LEDs that use blue light to excite YAG phosphors will greatly affect the light efficiency of the entire LED light-emitting module; using blue light to excite YAG phosphors The pure use of nitride red phosphors in white LEDs is expensive and not suitable for large-scale use; a small amount of red LEDs and a small amount of nitride red phosphors are used to compensate for the lack of red component spectrum in the entire LED light-emitting module, which not only achieves a more ideal display. Color index effect, and cost savings.

2. The LED bulb lamp prepared by using the above technical solution has the light source characteristics of the three LEDs in the LED light-emitting module, which makes the color rendering index Ra and luminous efficacy _ηv of this LED bulb lamp ideal.

Description of drawings

Fig. 1 shows the schematic diagram of the exploded structure of Embodiment 1 of the utility model;

Fig. 2 shows a schematic structural diagram of the LED light-emitting module of Embodiment 1 of the present utility model;

Fig. 3 shows a combined structure schematic diagram of Embodiment 1 of the utility model;

Fig. 4 shows the white light LED spectral distribution diagram of blue light exciting YAG fluorescent powder that the utility model implements;

Fig. 5 shows the white light LED spectral distribution figure that adds nitride red phosphor powder in the YAG phosphor powder that the utility model implements;

Fig. 6 shows the red light LED spectrum distribution figure that the utility model implements;

Fig. 7 shows the comprehensive spectral distribution figure of the utility model embodiment one;

Detailed ways

As shown in Figures 1 to 3, a high color rendering index and high light efficiency LED bulb lamp, its structure includes: lamp housing (1), LED light emitting module (2), radiator (3), driving power supply (4) , a lamp body (5), and a lamp holder (6), characterized in that: the LED light-emitting module (2) is a white light LED (7) in which a plurality of blue light excite YAG phosphor powder, and a white light in which a nitride red phosphor powder is added to a little YAG phosphor powder LED (8) and a little red light LED (9) are packaged on an aluminum substrate or a metal conductive epoxy PCB (10). By setting the number of different LEDs used, different color temperature, color rendering index and luminance can be obtained. Efficient LED bulbs, so as to get more ideal results.

The LED light-emitting module (2) is placed on the top of the radiator (3), and the top of the radiator (3) is connected with the lamp housing (1) at the same time, and the lower part of the radiator (3) is loaded with the driving power supply (4) and connected to the lamp holder The lamp body (5) of (6) is matched and connected. The lamp housing (1) is a milky white plastic lamp housing or a milky white glass lamp housing.

The blue light excites the white light LED of YAG phosphor powder, the blue light peak wavelength is 455±5nm, and the spectral half width is 25±5nm; the emission peak wavelength of the YAG phosphor powder is 570±10nm, and the spectral half width is 150±10nm. Figure 4 shows its spectral distribution, where the ratio of the blue light peak to the yellow light peak is: 1:0.58.

In the white LED with nitride red phosphor added to the YAG phosphor, the peak wavelength of blue light is 455±5nm, and the spectral half-width is 25±5nm; the emission peak wavelength of the YAG phosphor is 570±10nm, and the spectral half-width is 150±5nm. 10nm; the emission peak wavelength of the nitride red phosphor is 635±10nm, and the spectral half-width is 50±5nm. Fig. 5 shows its spectral distribution, wherein the ratio among the blue light peak, the yellow light peak and the red light peak is: 1:0.55:0.65.

The red LED has a peak wavelength of 640±10nm and a spectral half-width of 22±5nm. Figure 6 shows its spectral distribution.

As shown in Figure 2, the LED lighting module (2) is formed by encapsulating the above three kinds of LEDs on an aluminum substrate or a metal conductive epoxy PCB (10), and the three kinds of LEDs emit light respectively and are placed in the lamp housing (1) The light is mixed, and then the mixed diffused light is emitted from the lamp housing (1). Among them, 4 to 20 white LEDs (7) that excite YAG phosphor powder with blue light are distributed on the periphery, 1 to 8 white LEDs (8) that add nitride red phosphor powder to YAG phosphor powder, and 1 to 8 red LEDs (9) ) are staggeredly distributed in the center of the aluminum substrate or metal conductive epoxy PCB board (10).

Using the above method, use 11 white LEDs with YAG phosphors excited by blue light, 4 white LEDs with nitride red phosphors added to YAG phosphors, and 4 red LEDs to obtain a color temperature of 4794K and a color rendering index Ra of 93.77, LED bulb lamp with luminous efficacy _ηv of 86.31m/W. Figure 7 shows its integrated spectral distribution.

Using the above method to test, set the number of different LEDs used respectively, and obtain LED bulb lamps with different color temperature, color rendering index and luminous efficacy. Part of the experimental results of the color temperature, color rendering index and luminous efficacy are as follows:

Table 1 The situation of using 1 red LED

Table 1 shows the experimental results obtained when one red LED is used and 1 to 3 white LEDs are added to the YAG phosphor, and the color temperature is greater than 5000K. The number of white LEDs, the impact on the results is that the color temperature continues to increase, the luminous efficiency increases, but the color rendering index decreases; increasing the number of white LEDs with nitride red phosphors added to the YAG phosphor, the impact on the results is that the color temperature changes greatly. Small, the light effect is slightly reduced, and the color rendering index is improved.

Table 2 The situation of using 5 red LEDs

Table 2 shows the experimental results obtained when 5 red LEDs are used and 3 to 5 white LEDs with nitride red phosphors added to the YAG phosphor are used. The color temperature is between 3700K and 5100K, increasing The number of white LEDs with YAG phosphors excited by blue light affects the results in that the color temperature continues to rise, the light efficiency increases, and the color rendering index first increases and then decreases; increase the number of white LEDs that add nitride red phosphors to the YAG phosphors The number, the effect on the result is that the color temperature changes very little, the light effect is basically unchanged, and the color rendering index is improved.

Table 3 The situation of using 7 red LEDs

Table 3 shows the experimental results obtained when 7 red LEDs are used and 1 to 3 white LEDs with nitride red phosphors added to the YAG phosphor are used. The color temperature is between 2700K and 4800K, increasing The number of white LEDs with YAG phosphors excited by blue light affects the results in that the color temperature continues to rise, the light efficiency increases, and the color rendering index first increases and then decreases; increase the number of white LEDs that add nitride red phosphors to the YAG phosphors The number, the effect on the result is that the color temperature is slightly increased, the light effect is basically unchanged, and the color rendering index is improved.

In summary, the LED bulb lamp with high color rendering index and high luminous efficacy prepared by the utility model is characterized in that LED bulbs with different color temperatures, color rendering indexes and luminous efficacy are prepared according to the needs of different occasions according to the number of different LEDs used. lamp. The LED bulb lamp with high color rendering index and high light efficiency prepared by the utility model basically has a color rendering index of more than 90, and at the same time, the light efficiency is basically kept above 80lm/W, which can meet the lighting requirements of various occasions and is widely used. For home lighting, school lighting, bar lighting, office lighting, corridor lighting, etc.

Claims (5)

1. A LED bulb lamp with high color rendering index and high luminous efficiency, the structure includes: lamp housing, LED light-emitting module, heat sink, driving power supply, lamp body, lamp holder, characterized in that: the LED light-emitting module is excited by a plurality of blue light YAG fluorescence Powdered white LED, white LED with nitride red phosphor added to a little YAG phosphor, and a little red LED are packaged on an aluminum substrate or a metal conductive epoxy PCB board. By setting the number of different LEDs used, the obtained LED bulbs with different color temperature, color rendering index and light effect. 2. The LED bulb lamp with high color rendering index and high luminous efficiency according to claim 1, characterized in that: 4 to 20 white LEDs whose blue light excites YAG phosphor powder are distributed on the periphery of the LED light-emitting module, and 1 to 8 YAG phosphor powder The white LEDs with nitride red phosphor powder added thereto and 1 to 8 red LEDs are alternately distributed in the center of the LED light emitting module. 3. The LED bulb lamp with high color rendering index and high luminous efficiency according to claim 1, characterized in that: the blue light excites the white light LED of YAG phosphor powder, the peak wavelength of the blue light is 455±5nm, and the half width of the spectrum is 25±5nm; The emission peak wavelength of the phosphor is 570±10nm, and the spectral half-width is 150±10nm. For white LEDs with nitride red phosphors added to YAG phosphors, the peak wavelength of blue light is 455±5nm, and the spectral half-width is 25nm±5; the emission peak wavelength of YAG phosphors is 570±10nm, and the spectral half-width is 150±10nm; The emission peak wavelength of the nitride red phosphor is 635±10nm, and the spectral half-width is 50±5nm; for the red LED, the red light peak wavelength is 640±10nm, and the spectral half-width is 22±5nm. 4. The LED bulb lamp with high color rendering index and high luminous efficacy according to claim 1, wherein the lamp housing is a milky white plastic lamp housing or a milky white glass lamp housing. 5. The LED bulb lamp with high color rendering index and high luminous efficiency according to claim 1, wherein the LED is packaged on an aluminum substrate or a metal conductive epoxy PCB. the

Images