TWI589048B - Light emitting device - Google Patents

Description

Illuminating device

The present invention relates to a light-emitting device, and more particularly to a light-emitting device that emits light by an organic light-emitting element.

Since the emergence of the cathode ray tube display in the industrial revolution, people can receive signals for each display to enable the viewing user of the display to obtain various messages related to the signal. However, cathode ray tubes have the disadvantages of excessive volume, excessive power consumption, and high radiation doses. Therefore, in recent years, various displays have been continuously developed to plead for volume reduction, power saving, and low radiation dose. Moreover, in addition to the disadvantages of the cathode ray tube described above, it is desirable to retain the advantages of the cathode ray tube such as bright color and wide viewing angle.

Among various displays, liquid crystal displays, plasma displays, and displays using organic light-emitting elements as display means have been developed. The organic light-emitting element has the advantages of bright color, contrast, high reaction rate, no flick of the picture, wide viewing angle, light volume, low power consumption and low radiation dose. However, after the organic light-emitting element is irradiated by other high-energy rays, the organic molecules in the organic light-emitting element may be broken, and there may be a case where the starting voltage is increased and the amount of light is lowered.

In view of the above problems, the present invention provides a light-emitting device that enhances the life of light by illuminating an organic light-emitting element.

An embodiment of the invention provides a light emitting device comprising an organic light emitting element and an optical layer set. The organic light emitting element has a light emitting surface. The optical layer set has opposing first and second 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 disposed on the light emitting surface of the light emitting element. The filter layer is disposed on the light emitting surface of the light emitting element. When the light passes through the optical layer from the second surface and becomes the first light through the first surface, the first light has a first spectrum, and when the light passes through the optical layer from the first surface and becomes the second light through the second surface, The second light has a second spectrum. The first spectrum is different from the second spectrum. The first spectrum has a transmittance of less than or equal to 2% at a wavelength value of 380 nm or less.

According to the illuminating device of the embodiment of the present invention, the optical layer group can be configured such that when the light passes through the optical layer group from the second surface and passes through the first surface, the light having a wavelength value of less than 380 nm can only transmit less than light. Or equal to 2%, without causing 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 is not affected by the optical layer group too much. The effect is to maintain the performance of the light emitted by the organic light-emitting element.

The above description of the present invention and the following description of the embodiments of the present invention are intended to illustrate and explain the spirit and principles of the invention.

The detailed features and advantages of the embodiments of the present invention are set forth in the Detailed Description of the Detailed Description. The objects and advantages of the present invention can be readily understood by those of ordinary skill in the art in the <RTIgt; The following examples are intended to describe the present invention in further detail, but are not intended to limit the scope of the invention.

"Upper" as used in the specification can be expressed as being suspended above or as being in contact with the upper surface.

1A and FIG. 1B, FIG. 1A is a perspective exploded view of a light-emitting device 1 according to an embodiment of the present invention, and FIG. 1B illustrates the intensity of blue light emitted by the organic light-emitting device 110 of FIG. 1A with respect to wavelength. schematic diagram. The light-emitting device 1 includes an organic light-emitting element 110 and an optical layer group 120. The organic light emitting element 110 has a light emitting surface 110a. The optical layer set 120 has opposing first and second surfaces 120a, 120b. The first surface 120a is closer to the organic light emitting element 110 than the second surface 120b.

The optical layer group 120 includes a polarizing layer 121 and a filter layer 122. The polarizing layer 121 is disposed on the light emitting surface 110a of the light emitting element 110. The polarizing layer 121 may include a phase retardation layer for delaying the phase of the passing light, wherein the phase retarding 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 that are different from each other. The 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 110a of the organic light emitting element 110. The filter layer 122 may 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 the 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 in the second fast axis direction N3 and the refractive index in the second slow axis direction N4 are different. The 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 the filter layer 122 is formed, the filter layer 122 can be completed by stretching the material of the filter layer 122 and attaching to other components, wherein the direction of the tensile filter layer 122 can be the second fast axis. In the direction N3, other elements to be attached may be the polarizing layer 121. But not limited to this. When the filter layer 122 is formed, the filter layer 122 may be completed by applying a material of the liquid filter layer to other components and curing the coating layer 122. In the second fast axis direction N3, the other elements to be coated may also be the polarizing layer 121. Further, the filter layer 122 may be formed in the second fast axis direction N3 and the second slow axis direction N4 in an alignment manner. The alignment method may be such that ions having filter characteristics are doped into a PET (polyethylene terephthalate) plastic film and uniformly arranged in a second fast axis direction N3 or a second slow axis direction N4.

In this embodiment, the wavelength of visible light may range from 380 nm to 780 nm, and the total transmittance of the filter layer 122 for visible light may be 90% or more, or the average transmittance for visible light may be 90% or more. The filter layer 122 may have a transmittance of less than 15% for light having a wavelength value of 420 nm or less. The total transmittance of the filter layer 122 and the polarizing layer 121 for visible light may be 43% or more. 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 graph in the figure is a schematic diagram of the intensity of the blue light emitted by the organic light-emitting element 110 of FIG. 1A with respect to the wavelength. In the present embodiment, the blue light emitted by the organic light emitting element 110 may range from 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 wavelength peak L, and the half-high intensity of the blue light at the strongest intensity can be expressed as H/2, which corresponds to the half-high intensity H. The width of the wavelength value of /2 hours can be expressed as the wavelength half width W, and the wavelength peak L of the blue light emitted by the organic light emitting element 110 minus the wavelength half width W of the blue light can be expressed as the wavelength value L-W. The transmittance of the filter layer 122 for light having a wavelength value of L-W or less may be less than 2%.

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

When the spectrum of the optical layer 120 is to be obtained, the optical layer 120 may be disposed on the cover 130, and the first surface 120a faces the cover 130, and the second surface 120b faces the cover 130. The filter layer 122 may be located between the cover 130 and the polarizing layer 121. The cover 130 can be glass. As shown in FIG. 2A, the test light L0 is passed through the optical layer group 120 from the second surface 120b to become the first light L1 through the first surface 120a, and the first light L1 is received by the cover 130 to obtain the first spectrum λ1. . As shown in FIG. 2B, the test light L0 is passed from the cover 130 through the first surface 120a and through the optical layer 120 to pass through the second surface 120b to become the second light L2, and to receive the second light on the second surface 120b. And the second spectrum λ2 is obtained. 2A and 2B, the first spectrum λ1 is different from the second spectrum λ2. The transmittance of the second spectrum λ2 at a wavelength value of 380 nm or less may be greater than 2%.

As can be seen from the first spectrum shown in FIG. 2A, the transmittance of the first light at a wavelength of about 380 nm or less is very close to zero, as shown by the portion of the dotted circle in the figure, indicating light having a wavelength of about 380 nm or less. For example, UV (ultraviolet) light hardly passes through the first surface 120a from the second surface 120b through the optical layer stack 120. In detail, the first spectrum λ1 may have a transmittance of less than or equal to 2% at a wavelength value of 380 nm or less. 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 with light having a wavelength of about 380 nm or less, and the organic light in the organic light emitting element 110 can be avoided. The rupture of the molecules thus increases the lifetime of the organic light-emitting element 110.

It can be seen from the second spectrum shown in FIG. 2B that, as shown in the portion of the dotted circle in the figure, the second light has a slight transmittance at a wavelength of about 380 nm or less, indicating light having a wavelength of about 380 nm or less. It is still possible to penetrate the optical layer stack 120 from the first surface 120a and pass through the second surface 120b. In detail, the transmittance of the second spectrum λ2 at a wavelength value of 380 nm or less may be greater than 2%. Therefore, when the organic light emitting element 110 is disposed on the first surface 120a as shown in FIG. 1A, the light having a wavelength of about 380 nm or less in the light emitted from the organic light emitting element 110 can also be illuminated through the optical layer group 120. The user of the device 1 views, and thus the color representation exhibited by the illumination device 1 can be maintained.

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

The test conditions here are to store the illuminating device in the non-operating operation in the solar radiation simulation instrument and test it according to the ground solar radiation simulation specification of IEC 60068-2-5, Sa test. Among them, the highest temperature is about 40 degrees Celsius, the lowest temperature is about 25 degrees Celsius, and the illumination is about 1120 W/m ² . In each cycle, it lasts for eight hours in the illumination state and sixteen hours in the dark state. The power source of the same current is turned on for the organic light-emitting element 110 each time the 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 intensity of red light emission of the organic light-emitting element 110 in a different structure with respect to the number of cycles. FIG. 3B is a schematic diagram showing the relationship between the green light emission intensity of the organic light-emitting element 110 and the number of cycles in a different structure. FIG. 3C is a schematic diagram showing the relationship between the intensity of blue light emission of the organic light-emitting element 110 under different structures with respect to the number of cycles. The test point with the triangular mark (▲) in the figure is a case where the optical layer group 120 is provided to protect the organic light-emitting element 110, and this structure is the first structure, such as the light-emitting device 1 of FIG. 1A. The test point with the diamond mark (◆) in the figure is a 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 with a circular mark (●) in the figure is a case where the other elements are not provided to protect the organic light-emitting element 110, and this structure is the third structure. The solid thick line is a reference value, indicating that the light-emitting device 1 of FIG. 1A is completely not subjected to the ground solar radiation simulation test.

As shown in FIG. 3A, in the third structure in which the other elements are not provided to protect the organic light-emitting element 110 after six cycles, the red light-emitting intensity of the organic light-emitting element 110 is reduced to 70% or less. In the second structure in which only the polarizing layer 121 is provided to protect the organic light emitting element 110, the red light emitting intensity of the organic light emitting element 110 is reduced to 95% or less. 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 at 95% or more. After ten cycles, the red light emission intensity of the organic light-emitting element 110 of the second structure is reduced to 90% or less, and the red light-emitting intensity of the organic light-emitting element 110 of the first structure can be maintained at 90% or more. The red light emitting intensity of the organic light emitting element 110 of the first structure is about 7.3% higher than the red light emitting intensity of the organic light emitting element 110 of the second structure.

As shown in FIG. 3B, in the third structure in which the other element is not provided to protect the organic light emitting element 110, the green light emitting element 110 has a green light emission intensity of less than 93% after the second cycle. In the first structure in which only the polarizing layer 121 is provided to protect the organic light emitting element 110 and the optical layer group 120 is disposed to protect the organic light emitting element 110, the green light emitting intensity of the organic light emitting element 110 in ten cycles can be maintained at 98. %the above. The second structure and the first structure showed little deterioration of the green light emission intensity of the organic light-emitting element 110 in this test.

As shown in FIG. 3C, in the third structure in which the other element is not provided to protect the organic light emitting element 110, the blue light emitting intensity of the organic light emitting element 110 is reduced to 63% or less after the second cycle, and the organic light emitting element of the first structure is reduced. There is almost no degradation of the blue light intensity of 110. In the second structure in which only the polarizing layer 121 is disposed to protect the organic light emitting element 110, the blue light emitting intensity of the organic light emitting element 110 is reduced to less than 88% after the second cycle, and the blue light emitting intensity is reduced to 82% after six cycles. Hereinafter, after eight cycles, the blue light emission intensity is reduced to 75% or less, and the blue light emission intensity after ten cycles is about 70 to 75%. In the first structure in which the optical layer group 120 is disposed to protect the organic light emitting element 110, the blue light emitting intensity of the organic light emitting element 110 can be maintained above 95% after four cycles, and the blue light emitting intensity is reduced to only 95% after four cycles. Left and right, after seven cycles, the blue light intensity is reduced to less than 90%, and the blue light intensity after ten cycles is still about 80-85%. Therefore, after ten cycles, the blue light emission intensity of the organic light-emitting element 110 protected by the optical layer group 120 is about 13.7% higher than that of the blue light-emitting intensity of the organic light-emitting element 110 only by the polarizing layer 121.

As can be seen from the above, the optical layer group 120 can effectively protect the organic light emitting element 110 to slow the generation of luminance attenuation.

Please refer to FIG. 4A, FIG. 4B and FIG. 4C. FIG. 4A is a schematic diagram showing the relationship between the cross voltage of the red organic light-emitting element 110 under the different structure with respect to the number of cycles. FIG. 4B is a schematic diagram showing the relationship between the voltage across the green light-emitting organic light-emitting element 110 and the number of cycles in a different structure. FIG. 4C is a schematic diagram showing the relationship between the voltage across the blue organic light-emitting element 110 and the number of cycles in a different structure. The test point with the triangular mark (▲) in the figure is a case where the optical layer group 120 is provided to protect the organic light-emitting element 110, and this structure is the first structure, such as the light-emitting device 1 of FIG. 1A. The test point with the diamond mark (◆) in the figure is a 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 with a circular mark (●) in the figure is a case where the other elements are not provided to protect the organic light-emitting element 110, and this structure is the third structure.

As shown in FIG. 4A, in the third configuration in which the other elements are not provided to protect the organic light-emitting element 110, the voltage across the red organic light-emitting element 110 is continuously increased, and the voltage across the ten cycles is increased by about 4.5 to 5 volts. In the second structure in which only the polarizing layer 121 is provided to protect the organic light emitting element 110, the voltage across the red organic light emitting element 110 rises slowly, and the voltage across the ten cycles increases by about 3 volts. In the first configuration in which the optical layer group 120 is provided to protect the organic light emitting element 110, the voltage across the red organic light emitting element 110 rises more slowly, and the voltage across the ten cycles increases by only about 1.5 volts. After ten cycles, the voltage-to-pressure ratio of the red organic light-emitting element 110 protected by the optical layer group 120 is only about 1.5 volts lower than the cross-voltage of the red light-emitting organic light-emitting element 110 protected by the polarizing layer 121.

Similarly, as shown in FIG. 4B, in the third structure when the other elements are not provided to protect the organic light emitting element 110, the voltage across the green organic light emitting element 110 will continuously rise, and the voltage across the ten cycles will increase by about 4.5~. 5 volts. In the second structure in which only the polarizing layer 121 is provided to protect the organic light emitting element 110, the voltage across the green organic light emitting element 110 rises slowly, and the voltage across the ten cycles increases by about 2 to 2.5 volts. In the first configuration in which the optical layer group 120 is provided to protect the organic light emitting element 110, the voltage across the green organic light emitting element 110 rises more slowly, and the voltage across the ten cycles increases by about 1.5 volts. After ten cycles, the voltage-to-pressure ratio of the green organic light-emitting element 110 protected by the optical layer group 120 is only about 0.8 volts lower than the cross-voltage of the green organic light-emitting element 110 protected by the polarizing layer 121.

Similarly, as shown in FIG. 4C, in the third structure in which the other elements are not provided to protect the organic light emitting element 110, the voltage across the blue organic light emitting element 110 is continuously increased, and the voltage across the ten cycles is increased by about 5 to 5.5 volts. . In the second structure in which only the polarizing layer 121 is provided to protect the organic light emitting element 110, the voltage across the blue organic light emitting element 110 rises slowly, and the voltage across the ten cycles increases by about 3 to 3.5 volts. In the first structure in which the optical layer group 120 is provided to protect the organic light emitting element 110, the voltage across the blue organic light emitting element 110 rises more slowly, and the voltage across the ten cycles increases by about 2.5 to 3 volts. After ten cycles, the voltage-to-pressure ratio of the blue organic light-emitting element 110 protected by the optical layer group 120 is only about 0.6 volts lower than the cross-voltage of the organic light-emitting element 110 protected by the polarizing layer 121.

As can be seen from the above, the optical layer group 120 can effectively protect the organic light emitting element 110 to slow down the voltage rise, thereby reducing power consumption.

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

Referring to FIG. 5A, a cross-sectional view of a light emitting device 2 in accordance with another embodiment of the present invention is shown. In the present embodiment, the light-emitting device 2 includes an organic light-emitting element 110, a polarizing layer 121 and a filter layer 122, which may be used as an optical layer group, a first protective layer 131, and a second protective layer 132. The organic light-emitting element 110, the polarizing layer 121, and the filter layer 122 of FIG. 5A may be similar or identical to the organic light-emitting element 110, the polarizing layer 121, and the filter layer 122 of FIG. 1A, and thus the details thereof will not be repeated herein. The second protective layer 132 is disposed on the organic light emitting element 110 , and the light emitting surface 110 a faces the second protective layer 132 . The second protective layer 132 is disposed between the first protective layer 131 and the organic light emitting element 110. The first protective layer 131 has a hardness greater than that of the second protective layer 132. Each of the first protective layer 131 and the second protective layer 132 may be a light transmissive material. The first protective layer 131 can be, for example, a tempered glass cover, but is not limited thereto. The second protective layer can be, for example, glass or plastic, but is not limited thereto.

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

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

Referring to FIG. 5C, a cross-sectional view of a light emitting device 4 in accordance with another embodiment of the present invention is shown. In this embodiment, the second protective layer 132 can be disposed on the light emitting surface 110a of the organic light emitting element 110. The filter layer 122 may be disposed on the second protective layer 132. The first protective layer 131 may be disposed on the filter layer 122. The polarizing layer 121 may be disposed on the first protective layer 131. Wherein, the layers may be directly and tightly joined, or may be sandwiched with a glue layer or an air layer, or may be partially tightly joined and partially sandwiched with a glue layer or an air layer.

Referring to FIG. 5D, a cross-sectional view of a light emitting device 5 in accordance with another embodiment of the present invention is shown. In this embodiment, the filter layer 122 can be disposed on the light emitting surface 110a of the organic light emitting element 110. The polarizing layer 121 may be disposed on the filter layer 122. The second protective layer 132 may be disposed on the polarizing layer 121. The first protective layer 131 may be disposed on the second protective layer 132. Wherein, the layers may be directly and tightly joined, or may be sandwiched with a glue layer or an air layer, or may be partially tightly joined and partially sandwiched with a glue layer or an air layer.

Referring to FIG. 5E, a cross-sectional view of a light emitting device 6 in accordance with another embodiment of the present invention is shown. In this embodiment, the filter layer 122 can be disposed on the light emitting surface 110a of the organic light emitting element 110. The second protective layer 132 may be disposed on the filter layer 122. The polarizing layer 121 may be disposed on the second protective layer 132. The first protective layer 131 may be disposed on the polarizing layer 121. Wherein, the layers may be directly and tightly joined, or may be sandwiched with a glue layer or an air layer, or may be partially tightly joined and partially sandwiched with a glue layer or an air layer.

Referring to FIG. 5F, a cross-sectional view of a light-emitting device 7 in accordance with another embodiment of the present invention is shown. In this embodiment, the filter layer 122 can be disposed on the light emitting surface 110a of the organic light emitting element 110. The second protective layer 132 may be disposed on the filter layer 122. The first protective layer 131 may be disposed on the second protective layer 132. The polarizing layer 121 may be disposed on the first protective layer 131. Wherein, the layers may be directly and tightly joined, or may be sandwiched with a glue layer or an air layer, or may be partially tightly joined and partially sandwiched with a glue layer or an air layer.

In summary, the illuminating device of the embodiment of the present invention can be configured by the optical layer group 120 such that when the light passes through the optical layer group from the second surface and passes through the first surface, the wavelength is less than 380 nm. The higher light can only transmit less than or equal to 2% without causing damage to the organic light-emitting element, and the light emitted by the organic light-emitting element passes through the optical layer from the second surface and passes through the first surface. It is not affected by too many optical layer groups, and can maintain the performance of light emitted by the organic light-emitting element.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11‧‧‧ illuminating devices
110‧‧‧Organic light-emitting elements
110a ‧‧‧Lighting surface
120‧‧‧Optical layer group
120a‧‧‧ first surface
120b‧‧‧second surface
121‧‧‧ polarizing layer
122‧‧‧Filter layer
130‧‧‧ cover
131‧‧‧First protective layer
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

FIG. 1A is a perspective exploded view of a light emitting device according to an embodiment of the invention. FIG. 1B is a schematic diagram showing the wavelength peak value of the blue light emitted by the organic light-emitting element of FIG. 1A minus the wavelength half-width of the blue light. FIG. 2A is a schematic diagram showing a first spectrum of a first ray when light passes through the optical layer from the second surface and becomes the first ray through the first surface in the optical layer set of FIG. 1A. 2B is a schematic view showing a second spectrum of the second light when the light passes through the optical layer group from the first surface and becomes the second light through the second surface in the optical layer group of FIG. 1A. FIG. 3A is a schematic diagram showing the relationship between the intensity of red light emission of the organic light-emitting element under the different structure of FIG. 1A with respect to the number of cycles. FIG. 3B is a schematic diagram showing the relationship between the green light emission intensity of the organic light-emitting element in the different structure of FIG. 1A with respect to the number of cycles. FIG. 3C is a schematic diagram showing the relationship between the blue light emission intensity of the organic light-emitting element under the different structure of FIG. 1A with respect to the number of cycles. 4A is a schematic diagram showing the relationship between the voltage across the red light organic light-emitting element of FIG. 1A under different structures with respect to the number of cycles. 4B is a schematic diagram showing the relationship between the voltage across the green light organic light-emitting element of FIG. 1A under different structures with respect to the number of cycles. 4C is a schematic view showing the relationship between the voltage across the blue organic light-emitting element of FIG. 1A in a different structure with respect to the number of cycles. FIG. 5A is a schematic cross-sectional view of a light emitting device according to another embodiment of the present invention. FIG. 5B is a schematic cross-sectional view of a light emitting device according to another embodiment of the present invention. FIG. 5C is a schematic cross-sectional view of a light emitting device according to another embodiment of the present invention. FIG. 5D is a schematic cross-sectional view of a light emitting device according to another embodiment of the present invention. FIG. 5E is a 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.

1‧‧‧Lighting device

110‧‧‧Organic light-emitting elements

110a‧‧‧Lighting surface

120‧‧‧Optical layer group

120a‧‧‧ first surface

120b‧‧‧second surface

121‧‧‧ polarizing layer

122‧‧‧Filter layer

N1‧‧‧ first fast axis direction

N2‧‧‧ first slow axis direction

N3‧‧‧second fast axis direction

N4‧‧‧second slow axis direction

Claims (14)

A light-emitting device comprising: an organic light-emitting element having a light-emitting surface; and an optical layer set having a first surface and a second surface, the first surface being closer to the organic light-emitting element than the second surface The optical layer set includes: a filter layer disposed on the light emitting surface of the organic light emitting element; and a polarizing layer disposed on the light emitting surface of the organic light emitting element; wherein, when a light is from the second surface Passing through the optical layer group to form a first light through the first surface, the first light having a first spectrum, the light passing through the optical layer from the first surface and passing through the second surface The second light, the second light has a second spectrum, the first spectrum being different from the second spectrum, wherein the first spectrum has a transmittance of less than or equal to 2% at a wavelength value below 380 nm. The light-emitting device of claim 1, wherein the filter layer is located between the organic light-emitting element and the polarizing layer. The light-emitting device of claim 1, wherein the second spectrum has a transmittance of greater than 2% at a wavelength value of 380 nm or less. The illuminating device of claim 1, wherein the filter layer has a fast axis direction and a slow axis direction different from each other, and the refractive index of the filter layer along the fast axis direction and the refraction along the slow axis direction The rates are different. The light-emitting device of claim 1, wherein the filter layer has a transmittance of less than 15% for light having a wavelength value of 420 nm or less. The light-emitting device of claim 1, wherein the filter layer has a transmittance of less than 2% below a wavelength value of a wavelength of the blue light minus a wavelength half-width of the blue light emitted by the organic light-emitting element. The illuminating device of claim 6, wherein the blue light has a wavelength ranging from 420 nm to 480 nm. The light-emitting device of claim 1, wherein the filter layer has a transmittance for visible light of 90% or more. The illuminating device of claim 1, wherein the sum of the thickness of the filter layer and the thickness of the polarizing layer is less than or equal to 180 microns. The light-emitting device of claim 1, wherein the filter layer and the polarizing layer have a total transmittance of visible light of 43% or more. The illuminating device of claim 1, wherein the polarizing layer comprises a phase retarding layer disposed on the organic luminescent element and configured to delay the phase of the passing light. The illuminating device of claim 11, wherein the phase retardation layer is a quarter wave plate. The illuminating device of claim 1, further comprising a first protective layer disposed on the organic luminescent element, wherein the illuminating surface faces the first protective layer. The illuminating device of claim 13 further comprising a second protective layer disposed between the first protective layer and the organic light emitting element, the first protective layer having a hardness greater than the second protective layer.