CN106972112B - light emitting device - Google Patents

Abstract

The invention provides a light-emitting device, which includes an organic light-emitting element and an optical layer group. The organic light-emitting element has a light-emitting surface. The optical layer set has first and second opposite surfaces. The first surface is closer to the light emitting element than the second surface. The optical layer group includes a polarizing layer and a filter layer. The polarizing layer is arranged on the light-emitting surface of the light-emitting element. The filter layer is arranged on the light-emitting surface of the light-emitting element. When the light passes through the optical layer group from the second surface and passes through the first surface to become a first light, the first light has a first spectrum; when the light passes through the optical layer group from the first surface and passes through the second surface to become a second light, The second light has a second spectrum. The first spectrum is different from the second spectrum. The transmittance of the first spectrum at a wavelength value below 380 nm is less than or equal to 2%.

Description

light emitting device

technical field

The present invention relates to a light-emitting device, in particular to a light-emitting device that uses an organic light-emitting element to emit light.

Background technique

Since the appearance of cathode ray tube monitors in the industrial revolution, people can send signals to be received by each monitor, so that the viewers of the monitors can obtain various information related to the signals. However, cathode ray tubes have disadvantages such as large volume, high power consumption, and high radiation dose. Therefore, in recent years, various displays have been continuously developed in order to reduce the volume, save power and lower the radiation dose. Moreover, in addition to overcoming the disadvantages of the above-mentioned cathode ray tube, it is also desired to retain the advantages of the cathode ray tube, such as bright colors and wide viewing angles.

Among various displays, liquid crystal displays, plasma displays, and displays using organic light-emitting elements as display means have been developed. Organic light-emitting devices have the advantages of bright colors, sharp contrast, high response rate, no flickering, wide viewing angle, light and thin volume, low power consumption and low radiation dose. However, after the organic light-emitting device is irradiated by other high-energy rays, the organic molecules in the organic light-emitting device may be broken, and the start-up voltage may increase and the light emission may decrease.

Contents of the invention

In view of the above problems, the present invention proposes a light emitting device, which prolongs the lifetime of the organic light emitting device by limiting the light irradiated on it.

An embodiment of the present invention provides a light emitting device including an organic light emitting element and an optical layer set. An organic light emitting element has a light emitting surface. The optical layer set has opposite first surface and second surface. The first surface is closer to the light emitting element than the second surface. The optical layer group includes a polarizing layer and a filter layer. The polarizing layer is arranged on the light emitting surface of the light emitting element. The filter layer is arranged on the light emitting surface of the light emitting element. When the light passes through the optical layer group from the second surface and passes through the first surface to become the first light, the first light has a first spectrum; when the light passes through the optical layer group from the first surface and passes through the second surface to become the second light, The second light has a second spectrum. The first spectrum is different from the second spectrum. The transmittance of the first spectrum at a wavelength below 380nm is less than or equal to 2%.

According to the light-emitting device of the embodiment of the present invention, through the configuration of the optical layer group, when the light passes through the optical layer group from the second surface to the first surface, the light with a wavelength value below 380nm can only transmit light less than or equal to 2%, so as not to cause damage to the organic light-emitting element, and when the light emitted by the organic light-emitting element passes through the optical layer group from the second surface and passes through the first surface, the light will not be too much affected by the optical layer group, Therefore, the performance of the light emitted by the organic light-emitting element can be maintained.

The above descriptions about the content of the present invention and the following descriptions of the embodiments are used to demonstrate and explain the spirit and principle of the present invention, and provide further explanations of the claims of the present invention.

Description of drawings

FIG. 1A is a three-dimensional exploded schematic diagram of a light emitting device according to an embodiment of the present invention;

FIG. 1B is a schematic diagram showing the peak wavelength of the blue light emitted by the organic light-emitting element in FIG. 1A minus the wavelength value of the FWMW of the blue light;

2A is a schematic diagram of the first spectrum of the first light when the light passes through the optical layer group from the second surface and passes through the first surface to become the first light in the optical layer group of FIG. 1A;

2B is a schematic diagram of a second spectrum of the second light when the light passes through the optical layer group from the first surface and passes through the second surface to become a second light in the optical layer group of FIG. 1A;

3A is a schematic diagram showing the relationship between the red light emission intensity of the organic light-emitting device in different structures and the number of cycles tested in FIG. 1A;

FIG. 3B is a schematic diagram showing the relationship between the green light emission intensity of the organic light-emitting device in different structures and the number of cycles tested in FIG. 1A;

3C is a schematic diagram showing the relationship between the blue light emission intensity and the cycle number of the organic light-emitting device in different structures tested in FIG. 1A;

4A is a schematic diagram showing the relationship between the cross-voltage and the number of cycles of testing the red organic light-emitting device in FIG. 1A under a different structure;

FIG. 4B is a schematic diagram showing the relationship between the cross-voltage of the green organic light-emitting device in different structures and the number of cycles tested in FIG. 1A;

FIG. 4C is a schematic diagram showing the relationship between the cross-voltage of the blue organic light-emitting device in different structures and the number of cycles tested in FIG. 1A;

5A is a schematic cross-sectional view of a light emitting device according to another embodiment of the present invention;

5B is a schematic cross-sectional view of a light emitting device according to another embodiment of the present invention;

5C is a schematic cross-sectional view of a light emitting device according to another embodiment of the present invention;

5D is a schematic cross-sectional view of a light emitting device according to another embodiment of the present invention;

5E is a schematic cross-sectional view of a light emitting device according to another embodiment of the present invention;

FIG. 5F is a schematic cross-sectional view of a light emitting device according to another embodiment of the present invention.

reference sign

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 Lighting devices

110 organic light-emitting elements

110a luminous surface

120 optical layer groups

120a first surface

120b second surface

121 Polarizing layer

122 filter layer

130 Cover

131 First layer of protection

132 Second protective layer

L0, L1, L2 rays

N1 First fast axis direction

N2 First slow axis direction

N3 Second fast axis direction

N4 Second slow axis direction

Detailed ways

The detailed features and advantages of the embodiments of the present invention are described in detail below in the implementation manner, the content is enough for any person skilled in the art to understand the technical content of the embodiments of the present invention and implement them accordingly, and according to the content disclosed in this specification , claims and drawings, anyone skilled in the art can easily understand the related objects and advantages of the present invention. The following examples are to further describe the viewpoints of the present invention in detail, but not to limit the scope of the present invention in any way.

The "upper" mentioned in the specification may mean suspended above, or be in contact with the upper surface.

Please refer to FIG. 1A and FIG. 1B. FIG. 1A shows a three-dimensional exploded view of a light-emitting device 1 according to an embodiment of the present invention, and FIG. 1B shows the luminous intensity of the blue light emitted by the organic light-emitting element 110 in FIG. 1A relative to the wavelength. schematic diagram. The light emitting device 1 includes an organic light emitting element 110 and an optical layer set 120 . The organic light emitting element 110 has a light emitting surface 110a. The optical layer set 120 has opposite first surface 120a and second surface 120b. The first surface 120a is closer to the organic light emitting element 110 than the second surface 120b.

The optical layer set 120 includes a polarizing layer 121 and a filter layer 122 . The polarizing layer 121 is disposed on the light emitting surface 110 a of the light emitting element 110 . The polarizing layer 121 may include a phase retardation layer for retarding the phase of passing light, wherein the phase retardation layer may be a quarter-wave plate. The polarizing layer 121 has a first fast axis direction N1 and a first slow axis direction N2 which are different from each other. The included angle between the first fast axis direction N1 and the first slow axis direction N2 may be 90°.

The filter layer 122 is disposed on the light emitting surface 110 a of the organic light emitting element 110 . The filter layer 122 can be located between the organic light emitting element 110 and the polarizing layer 121 . The material of the filter layer 122 may be polyethylene terephthalate (PET). The filter layer 122 may have a second fast axis direction N3 and a second slow axis direction N4 that are different from each other, and an included angle between the second fast axis direction N3 and the second slow axis direction N4 may be 90°. The refractive index of the filter layer 122 along the second fast axis direction N3 is different from the refractive index along the second slow axis direction N4. The included angle between the first fast axis direction N1 of the polarizing layer 121 and the second fast axis direction N3 of the filter layer 122 may be about 3°. For example, when the angle of the first fast axis direction N1 of the polarizing layer 121 is 0° or 180°, the angle of the second fast axis direction N3 of the filter layer 122 may be about 177°.

When making the filter layer 122, the material of the filter layer 122 can be stretched and attached to other components to complete the filter layer 122, wherein the direction of stretching the filter layer 122 can be the second fast axis direction N3, other attached components may be the polarizing layer 121 . But not limited to this. When making the filter layer 122, the filter layer 122 can also be completed by coating the material of the filter layer in liquid state on other elements and then solidified, wherein the direction of coating the filter layer 122 can also be the first In the direction of the two fast axes N3, other components coated can also be the polarizing layer 121 . In addition, the filter layer 122 can also be formed along the second fast axis direction N3 and the second slow axis direction N4 in an alignment manner. Wherein, the alignment method is to dope PET (polyethylene terephthalate) plastic film with ions having light filtering properties, and arrange them uniformly in the second fast axis direction N3 or the second slow axis direction N4.

In this embodiment, the wavelength range of visible light may be 380nm-780nm, and the total transmittance of visible light of the filter layer 122 may be above 90%, or the average transmittance of visible light may be above 90%. The transmittance of the filter layer 122 for light with a wavelength below 420 nm may be less than 15%. The total transmittance of the filter layer 122 and the polarizing layer 121 for visible light may be above 43%. The sum of the thickness of the filter layer 122 and the thickness of the polarizing layer 121 may be less than or equal to 180 microns.

Moreover, as shown in FIG. 1B , the curve in the figure is a schematic diagram of the luminous intensity of the blue light emitted by the organic light emitting element 110 in FIG. 1A relative to the wavelength. In this embodiment, the wavelength range of the blue light emitted by the organic light emitting element 110 may be 420 nm to 480 nm. The strongest intensity of the blue light can be expressed as H, and the wavelength value corresponding to the strongest intensity can be expressed as the peak wavelength L, and the half-high intensity of the blue light at the strongest intensity can be expressed as H/2, and the blue light corresponds to half The width of the wavelength value at high intensity H/2 can be expressed as the wavelength half maximum width W, and the wavelength peak value L of the blue light emitted by the organic light emitting element 110 minus the wavelength half maximum width W of the blue light can be expressed as the wavelength value L− W. The transmittance of the filter layer 122 for the light below the wavelength value L-W may be less than 2%.

Please refer to FIG. 2A and FIG. 2B . FIG. 2A shows the first spectrum of the first light L1 in the optical layer group 120 of FIG. 1A when the light L0 passes through the optical layer group 120 from the second surface 120b and passes through the first surface 120a to become the first light L1. Schematic diagram of λ1. FIG. 2B shows that in the optical layer group 120 of FIG. 1A, when the light L0 passes through the optical layer group from the first surface 120a and becomes the second light L2 through the second surface 120b, the second spectrum λ2 of the second light L2 schematic diagram.

When it is desired to obtain the spectrum of light passing through the optical layer group 120 , the optical layer group 120 can be disposed on the cover body 130 , with the first surface 120 a facing the cover body 130 and the second surface 120 b facing away from the cover body 130 . The filter layer 122 can be located between the cover 130 and the polarizing layer 121 . The cover 130 can be glass. As shown in FIG. 2A , let the test light L0 pass through the optical layer group 120 from the second surface 120b and pass through the first surface 120a to become the first light L1, and receive the first light L1 at the cover 130 to obtain the first spectrum λ1 . As shown in FIG. 2B , let the test light L0 pass through the first surface 120a from the cover 130 and pass through the optical layer group 120 to become the second light L2 through the second surface 120b, and receive the second light at the second surface 120b And the second spectrum λ2 is obtained. From FIG. 2A and FIG. 2B , it can be seen that the first spectrum λ1 is different from the second spectrum λ2 . The transmittance of the second spectrum λ2 at wavelengths below 380 nm may be greater than 2%.

As can be seen from the first spectrum shown in FIG. 2A , as shown in the part circled by the dotted circle in the figure, the transmittance of the first light at a wavelength below about 380nm is very close to zero, indicating that the light at a wavelength below about 380nm, for example UV (ultraviolet) light hardly penetrates the optical layer group 120 from the second surface 120b and passes through the first surface 120a. Specifically, the transmittance of the first spectrum λ1 at wavelengths below 380 nm may be less than or equal to 2%. Therefore, when the organic light-emitting element 110 is disposed on the first surface 120a as shown in FIG. 1A, the organic light-emitting element 110 can be largely prevented from being irradiated by light with a wavelength of about 380 nm or less, and the organic molecules in the organic light-emitting element 110 can be avoided. Therefore, breakage occurs, thereby increasing the lifetime of the organic light emitting element 110 .

From the second spectrum shown in Figure 2B, it can be seen that, as shown in the part circled by the dotted circle in the figure, the second light can still have a little transmittance at a wavelength below about 380nm, which means that the light with a wavelength below about 380nm still has a little The optical layer group 120 can be penetrated from the first surface 120a to pass through the second surface 120b. Specifically, the transmittance of the second spectrum λ2 at wavelengths below 380 nm may be greater than 2%. Therefore, when the organic light emitting element 110 is arranged on the first surface 120a as shown in FIG. 1 for viewing by users, and thus the color performance presented by the light emitting device 1 can be maintained.

The protection effect of the optical layer group 120 in FIG. 1A on the organic light emitting device 110 will be described below.

The test condition here is to store the non-operating light-emitting device in a solar radiation simulation instrument, and conduct the test according to IEC 60068-2-5, the ground solar radiation simulation specification for the Sa test. Among them, the highest temperature is about 40 degrees Celsius, the lowest temperature is about 25 degrees Celsius, and the illuminance is about 1120W/m ² . In each cycle, the light state lasted for eight hours and the dark state lasted for sixteen hours. A power supply with the same current is turned on to the organic light-emitting element 110 every time a test point is taken to test its luminous intensity.

Please refer to FIG. 3A , FIG. 3B and FIG. 3C . FIG. 3A is a schematic diagram showing the relationship between the red light emission intensity of the organic light emitting device 110 and the cycle number under different structures. FIG. 3B is a schematic diagram showing the relationship between the green light emission intensity of the organic light emitting device 110 and the cycle number under different structures. FIG. 3C is a schematic diagram showing the relationship between the blue light emission intensity of the organic light emitting device 110 and the cycle number under different structures. The test point marked with a triangle (▲) in the figure is the situation where the optical layer group 120 is installed to protect the organic light emitting device 110, and this structure is the first structure, such as the light emitting device 1 of FIG. 1A. The test point marked with a diamond (◆) in the figure is the case where only the polarizing layer 121 is provided to protect the organic light emitting element 110, and this structure is the second structure. The test point marked with a circle (●) in the figure is the situation where no other elements are installed to protect the organic light emitting element 110 , and this structure is the third structure. The solid thick line is a reference value, which represents the situation when the light emitting device 1 in FIG. 1A is not subjected to the ground solar radiation simulation test at all.

As shown in FIG. 3A , after six cycles, in the third structure in which no other elements are provided to protect the organic light emitting element 110 , the red light emission intensity of the organic light emitting element 110 drops below 70%. In the second structure where only the polarizing layer 121 is provided to protect the organic light emitting element 110, the red light emission intensity of the organic light emitting element 110 is reduced to below 95%. In the first structure in which the optical layer group 120 is provided to protect the organic light emitting element 110, the red light emission intensity of the organic light emitting element 110 can be maintained above 95%. After ten cycles, the red light emission intensity of the organic light emitting device 110 of the second structure drops below 90%, and the red light emission intensity of the organic light emitting device 110 of the first structure can be maintained above 90%. Wherein, the red light emission intensity of the organic light emitting element 110 of the first structure is about 7.3% higher than the red light emission intensity of the organic light emitting element 110 of the second structure.

As shown in FIG. 3B , in the third structure in which no other elements are provided to protect the organic light emitting element 110 , the green light emission intensity of the organic light emitting element 110 drops below 93% after the second cycle. In the second structure in which only the polarizing layer 121 is provided to protect the organic light emitting element 110 and in the first structure in which the optical layer group 120 is provided to protect the organic light emitting element 110, the green light emission intensity of the organic light emitting element 110 in ten cycles can be maintained at 98 %above. In the test of the second structure and the first structure, the green light emission intensity of the organic light-emitting element 110 has almost no decline.

As shown in FIG. 3C , in the third structure in which no other elements are installed to protect the organic light emitting element 110, the blue light emission intensity of the organic light emitting element 110 drops below 63% after the second cycle, while the organic light emitting element in the first structure The luminous intensity of blue light of 110 has almost no decline. In the second structure in which only the polarizing layer 121 is provided to protect the organic light-emitting element 110, the blue light emission intensity of the organic light-emitting element 110 will drop to below 88% after two cycles, and its blue light emission intensity will drop to 82% after six cycles. Below, the blue luminous intensity drops to below 75% after eight cycles, and the blue luminous intensity is about 70-75% after ten cycles. In the first structure in which the optical layer group 120 is set to protect the organic light-emitting element 110, the blue light emission intensity of the organic light-emitting element 110 can be maintained above 95% before four cycles, and its blue light emission intensity only drops to 95% after four cycles After about seven cycles, the blue luminous intensity drops below 90%, and after ten cycles, the blue luminous intensity still maintains about 80-85%. Therefore, after ten cycles, the blue light emission intensity of the organic light emitting device 110 protected by the optical layer set 120 is about 13.7% higher than that of the organic light emitting device 110 protected only by the polarizing layer 121 .

It can be known from the above that the optical layer set 120 can effectively protect the organic light emitting element 110 to slow down the generation of brightness attenuation.

Please refer to FIG. 4A , FIG. 4B and FIG. 4C . FIG. 4A is a schematic diagram showing the relationship between the cross voltage and the cycle number of the red OLED 110 under different structures. FIG. 4B is a schematic diagram illustrating the relationship between the voltage across the green organic light emitting device 110 and the number of cycles in different structures. FIG. 4C is a schematic diagram illustrating the relationship between the cross-voltage of the blue organic light-emitting device 110 and the number of cycles in different structures. The test point marked with a triangle (▲) in the figure is the situation where the optical layer group 120 is installed to protect the organic light emitting device 110, and this structure is the first structure, such as the light emitting device 1 of FIG. 1A. The test point marked with a diamond (◆) in the figure is the case where only the polarizing layer 121 is provided to protect the organic light emitting element 110, and this structure is the second structure. The test point marked with a circle (●) in the figure is the situation where no other elements are installed to protect the organic light emitting element 110 , and this structure is the third structure.

As shown in FIG. 4A , in the third structure when no other elements are installed to protect the organic light emitting element 110 , the cross voltage of the red light organic light emitting element 110 will continue to rise, and the cross voltage will increase by about 4.5-5 volts after ten cycles. In the second structure where only the polarizing layer 121 is provided to protect the organic light-emitting element 110 , the cross-voltage of the red-light organic light-emitting element 110 rises slowly, and the cross-voltage rises by about 3 volts after ten cycles. In the first structure when the optical layer group 120 is provided to protect the organic light emitting element 110 , the cross voltage of the red light organic light emitting element 110 will rise more slowly, and the cross voltage only rises about 1.5 volts after ten cycles. After ten cycles, the voltage across the red organic light emitting device 110 protected by the optical layer set 120 is about 1.5 volts lower than that of the red organic light emitting device 110 protected only by the polarizing layer 121 .

Similarly, as shown in FIG. 4B , in the third structure when no other elements are installed to protect the organic light emitting element 110 , the cross-voltage of the green organic light-emitting element 110 will continue to rise, and the cross-voltage after ten cycles will increase by about 4.5- 5 volts. In the second structure where only the polarizing layer 121 is provided to protect the organic light-emitting element 110 , the cross-voltage of the green organic light-emitting element 110 rises relatively slowly, and the cross-voltage rises by about 2-2.5 volts after ten cycles. In the first structure when the optical layer group 120 is provided to protect the organic light emitting element 110 , the cross voltage of the green organic light emitting element 110 will rise more slowly, and the cross voltage will rise by about 1.5 volts after ten cycles. After ten cycles, the voltage across the green organic light emitting device 110 protected by the optical layer set 120 is about 0.8 volts lower than that of the green organic light emitting device 110 protected only by the polarizing layer 121 .

Similarly, as shown in FIG. 4C , in the third structure in which no other elements are installed to protect the organic light emitting element 110 , the cross voltage of the blue organic light emitting element 110 will continue to rise, and the cross voltage rises by about 5-5.5 volts after ten cycles. . In the second structure where only the polarizing layer 121 is provided to protect the organic light-emitting element 110 , the cross-voltage of the blue-light organic light-emitting element 110 rises relatively slowly, and the cross-voltage rises by about 3-3.5 volts after ten cycles. In the first structure in which the optical layer group 120 is provided to protect the organic light emitting element 110 , the cross voltage of the blue organic light emitting element 110 will rise more slowly, and the cross voltage will rise by about 2.5-3 volts after ten cycles. After ten cycles, the voltage across the blue organic light emitting device 110 protected by the optical layer set 120 is about 0.6 volts lower than that of the organic light emitting device 110 protected only by the polarizing layer 121 .

It can be seen from the above that the optical layer set 120 can effectively protect the organic light emitting device 110 to slow down the rise of the cross voltage, thereby reducing power consumption.

In addition, light emitting devices according to various embodiments of the present invention will be described below.

Please refer to FIG. 5A , which is a schematic cross-sectional view of a light emitting device 2 according to another embodiment of the present invention. In this embodiment, the light-emitting device 2 includes an organic light-emitting element 110 , a polarizing layer 121 and a filter layer 122 , a first protection layer 131 and a second protection layer 132 , which can be used as an optical layer group. The organic light-emitting element 110, polarizing layer 121, and filter layer 122 in FIG. 5A may be similar or identical to the organic light-emitting element 110, polarizing layer 121, and filter layer 122 in FIG. 1A, so details thereof will not be repeated here. The second protection layer 132 is disposed on the organic light emitting element 110 , and the light emitting surface 110 a faces the second protection layer 132 . The second protection layer 132 is disposed between the first protection layer 131 and the organic light emitting element 110 . The hardness of the first protective layer 131 is greater than that of the second protective layer 132 . Both the first protection layer 131 and the second protection layer 132 can be light-transmitting materials. The first protective layer 131 can be, for example, a tempered glass cover, but not limited thereto. The second protective layer can be, for example, glass or plastic, but not limited thereto.

In this embodiment, the second protection layer 132 can be disposed on the light emitting surface 110 a of the organic light emitting element 110 . The filter layer 122 can be disposed on the second protection layer 132 . The polarizing layer 121 can be disposed on the filter layer 122 . The first protective layer 131 can be disposed on the polarizing layer 121 . Wherein, the layers may be directly tightly bonded, or may be sandwiched with an adhesive layer or an air layer, or may be partially tightly bonded and partially sandwiched with an adhesive layer or an air layer.

Please refer to FIG. 5B , which is a schematic cross-sectional view of a light emitting device 3 according to another embodiment of the present invention. In this embodiment, the second protection layer 132 can be disposed on the light emitting surface 110 a of the organic light emitting element 110 . The first protection layer 131 may be disposed on the second protection layer 132 . The filter layer 122 can be disposed on the first protection layer 131 . The polarizing layer 121 can be disposed on the filter layer 122 . Wherein, the layers may be directly tightly bonded, or may be sandwiched with an adhesive layer or an air layer, or may be partially tightly bonded and partially sandwiched with an adhesive layer or an air layer.

Please refer to FIG. 5C , which is a schematic cross-sectional view of a light emitting device 4 according to another embodiment of the present invention. In this embodiment, the second protection layer 132 can be disposed on the light emitting surface 110 a of the organic light emitting element 110 . The filter layer 122 can be disposed on the second protection layer 132 . The first protection layer 131 can be disposed on the filter layer 122 . The polarizing layer 121 can be disposed on the first protection layer 131 . Wherein, the layers may be directly tightly bonded, or may be sandwiched with an adhesive layer or an air layer, or may be partially tightly bonded and partially sandwiched with an adhesive layer or an air layer.

Please refer to FIG. 5D , which is a schematic cross-sectional view of a light emitting device 5 according to another embodiment of the present invention. In this embodiment, the filter layer 122 can be disposed on the light emitting surface 110 a of the organic light emitting device 110 . The polarizing layer 121 can be disposed on the filter layer 122 . The second protective layer 132 can be disposed on the polarizing layer 121 . The first protection layer 131 may be disposed on the second protection layer 132 . Wherein, the layers may be directly tightly bonded, or may be sandwiched with an adhesive layer or an air layer, or may be partially tightly bonded and partially sandwiched with an adhesive layer or an air layer.

Please refer to FIG. 5E , which is a schematic cross-sectional view of a light emitting device 6 according to another embodiment of the present invention. In this embodiment, the filter layer 122 can be disposed on the light emitting surface 110 a of the organic light emitting device 110 . The second protective layer 132 can be disposed on the filter layer 122 . The polarizing layer 121 can be disposed on the second protection layer 132 . The first protective layer 131 can be disposed on the polarizing layer 121 . Wherein, the layers may be directly tightly bonded, or may be sandwiched with an adhesive layer or an air layer, or may be partially tightly bonded and partially sandwiched with an adhesive layer or an air layer.

Please refer to FIG. 5F , which is a schematic cross-sectional view of a light emitting device 7 according to another embodiment of the present invention. In this embodiment, the filter layer 122 can be disposed on the light emitting surface 110 a of the organic light emitting device 110 . The second protective layer 132 can be disposed on the filter layer 122 . The first protection layer 131 may be disposed on the second protection layer 132 . The polarizing layer 121 can be disposed on the first protection layer 131 . Wherein, the layers may be directly tightly bonded, or may be sandwiched with an adhesive layer or an air layer, or may be partially tightly bonded and partially sandwiched with an adhesive layer or an air layer.

To sum up, the light-emitting device of the embodiment of the present invention can configure the optical layer group 120 so that when the light passes through the optical layer group from the second surface to the first surface, the energy with a wavelength value below 380nm is relatively high. The light can only transmit less than or equal to 2%, and will not cause damage to the organic light-emitting element, and when the light emitted by the organic light-emitting element passes through the optical layer group from the second surface and passes through the first surface, the light will not Affected by too many optical layer groups, the performance of the light emitted by the organic light-emitting device can be maintained.

Although the present invention is disclosed by the aforementioned embodiments, they are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, all changes and modifications made belong to the scope of patent protection of the present invention. Please refer to the claims for the scope of protection defined by the present invention.

Claims (14)

1. a kind of light-emitting device, which is characterized in that the light-emitting device includes：

One organic illuminating element has a light-emitting surface；And

There is one optical layer group opposite a first surface and a second surface, the first surface second surface to connect The nearly organic illuminating element, the optical layer group include：

One filter layer is set on the light-emitting surface of the organic illuminating element；And

One polarizing layer is set on the light-emitting surface of the organic illuminating element；

Wherein, when a light becomes one first light across the optical layer group from the second surface by the first surface Line, first light has one first spectrum, when the light passes through from the first surface across the optical layer group The second surface becomes one second light, and there is second light one second spectrum, first spectrum to be different from described Second spectrum, wherein first spectrum is that 380nm penetrances below are less than or equal to 2% in wavelength value.

2. light-emitting device as described in claim 1, which is characterized in that the filter layer is located at the organic illuminating element and institute It states between polarizing layer.

3. light-emitting device as described in claim 1, which is characterized in that second spectrum is that 380nm is below in wavelength value Penetrance is more than 2%.

4. light-emitting device as described in claim 1, which is characterized in that the filter layer has a fast axis direction different each other And a slow-axis direction, the filter layer are different along the refractive index of the fast axis direction and along the refractive index of the slow-axis direction.

5. light-emitting device as described in claim 1, which is characterized in that the filter layer is that 420nm is below for wavelength value The penetrance of light is less than 15%.

6. light-emitting device as described in claim 1, which is characterized in that the filter layer sends out the organic illuminating element The wavelength value penetrance below that the wavelength peak of the blue light gone out subtracts the wavelength halfwidth of the blue light is less than 2%.

7. light-emitting device as claimed in claim 6, which is characterized in that the wave-length coverage of the blue light is 420nm to 480nm.

8. light-emitting device as described in claim 1, which is characterized in that the filter layer is 90% for the penetrance of visible light More than.

9. light-emitting device as described in claim 1, which is characterized in that the thickness of the thickness of the filter layer and the polarizing layer Summation be less than or equal to 180 microns.

10. light-emitting device as described in claim 1, which is characterized in that the filter layer and the polarizing layer are for visible light Total penetrance be 43% or more.

11. light-emitting device as described in claim 1, which is characterized in that the polarizing layer includes a phase delay layer, is set to On the organic illuminating element, and to postpone the phase of passed through light.

12. light-emitting device as claimed in claim 11, which is characterized in that the phase delay layer is quarter-wave plate.

13. light-emitting device as described in claim 1, which is characterized in that the light-emitting device further includes one first protective layer, if It is placed on the organic illuminating element, and the light-emitting surface is towards first protective layer.

14. light-emitting device as claimed in claim 13, which is characterized in that the light-emitting device further includes one second protective layer, It is set between first protective layer and the organic illuminating element, the hardness of first protective layer is more than described second and protects Sheath.