CN114551696A - Micro-nano structured polarized white light emitting device - Google Patents
Micro-nano structured polarized white light emitting device Download PDFInfo
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- CN114551696A CN114551696A CN202210084304.5A CN202210084304A CN114551696A CN 114551696 A CN114551696 A CN 114551696A CN 202210084304 A CN202210084304 A CN 202210084304A CN 114551696 A CN114551696 A CN 114551696A
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 41
- 239000002184 metal Substances 0.000 claims abstract description 41
- 239000002086 nanomaterial Substances 0.000 claims abstract description 14
- 230000010287 polarization Effects 0.000 claims abstract description 13
- 239000000758 substrate Substances 0.000 claims description 18
- 238000005566 electron beam evaporation Methods 0.000 claims description 6
- 238000001755 magnetron sputter deposition Methods 0.000 claims description 6
- 229910052709 silver Inorganic materials 0.000 claims description 6
- 239000004332 silver Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000010894 electron beam technology Methods 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 abstract description 2
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 9
- 238000002834 transmittance Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/868—Arrangements for polarized light emission
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- Microelectronics & Electronic Packaging (AREA)
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Abstract
The invention discloses a polarized white light emitting device with a micro-nano structure, and belongs to the technical field of optical materials. The metal film layer is divided into a plurality of rectangular areas, each rectangular area is used as a red light emitting subunit, a green light emitting subunit or a blue light emitting subunit, and each rectangular area is provided with a first grating which is longitudinally arranged, a second grating and a third grating which are transversely arranged. The invention adopts the scheme of the super-surface micro-cavity, and has higher polarization and transmissivity of emergent light through the cyclic utilization of photons.
Description
Technical Field
The invention relates to the technical field of optical materials, in particular to a polarized white light emitting device with a micro-nano structure.
Background
At present, main components of a display screen in a mobile phone can be divided into a backlight module, a light emitting module and a display module, and a polaroid is an important component in the display module. The display principle of the polaroid is that light generated by the backlight source is converted into polarized light, and then bright and dark contrast is generated according to the emergent polarized light to generate a display picture. Common polarizer devices can be classified into a reflective-refractive polarization type, a selective absorption (dichroic) type, a crystal birefringence type, and the like, and the basic principle thereof is to eliminate or separate linearly polarized light in other directions, so as to emit the desired polarized light.
Since linearly polarized light in other directions is eliminated or separated, corresponding light energy loss is necessarily brought about. Assuming that light generated by the backlight can be converted into polarized light of X-polarization and Y-polarization, and the emitted light is only one of them, the efficiency of electro-optical conversion WPE (which can be simply understood as the transmission efficiency Ty of incident light, Ty can be defined as Ty ═ Txy + Tyy)/2, where Txy represents the transmittance of incident light of X-polarization exiting Y-polarization, and Tyy represents the transmittance of incident light of Y-polarization exiting Y-polarization) is at most 50% for the conventional polarizing device. The WPE tends to be lower if various losses in polarization and emergence (e.g., structure intrinsic loss, higher order diffraction loss, etc.) are taken into account.
In addition, in the prior art, the white light emission is often formed by mixing red, green and blue light emission, and the white light emission is obtained by dividing the light emission unit into a red light emission subunit, a green light emission subunit and a blue light emission subunit, which are correspondingly arranged.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention aims to provide a polarized white light emitting device with a micro-nano structure to achieve better polarization performance.
The technical scheme disclosed by the invention is as follows: the white light is emitted by mixing the red light emitting subunit, the green light emitting subunit and the blue light emitting subunit, and the white light comprises a metal film layer, a light emitting layer, a metal backlight layer and a substrate layer which are sequentially stacked, wherein the substrate layer is used as a substrate, the metal backlight layer is used for reflecting light, the light emitting layer is used as a light source, and the metal film layer is used for converting polarized light; setting the thickness of the metal film layer as t, wherein the t is 140-160 nm; the metal film layer is divided into a plurality of rectangular areas, and each rectangular area is used as a red light emitting subunit, a green light emitting subunit or a blue light emitting subunit; setting the transverse length of each rectangular area as p and the longitudinal length as d; three gratings are arranged in each rectangular area, namely a first grating which is longitudinally arranged and a second grating and a third grating which are transversely arranged, wherein the first grating is longitudinally arranged between the second grating and the third grating, the second grating and the third grating respectively extend transversely from two longitudinal ends of the first grating in opposite directions, the lengths of the slotted holes of the first grating, the second grating and the third grating are all l, the widths of the slotted holes are all w, the groove depths of the second grating and the third grating are t, and the groove depth of the first grating is h; when the rectangular area is used as a red light emitting subunit, values should be taken in the ranges of p being 360-; when the rectangular area is used as a green light emitting subunit, values are taken in the ranges of p being 330-360nm, d being 330-360nm, h being 35-60nm, w being 60-70nm and l being 160-190nm on the premise of meeting 2l-w < p and 2w + l < d; when the rectangular region is used as a blue light emitting subunit, values should be taken in the ranges of p-280-330 nm, d-300-330 nm, h-65-80 nm, w-40-55 nm, l-145-180 nm on the premise of satisfying 2l-w < p and 2w + l < d.
Further, t is 150 nm.
Further, the substrate layer is a silicon oxide substrate.
Further, the metal backlight layer adopts metal aluminum or silver.
Further, the metal film layer is made of metal silver.
Further, the light emitting layer adopts an LED or OLED light source.
Further, the metal backlight layer is obtained by adopting electron beam evaporation or magnetron sputtering on the substrate layer.
Further, the metal film layer is obtained by adopting electron beam evaporation or magnetron sputtering on the luminescent layer.
Further, the grating structure in each rectangular area is manufactured on the metal film layer by adopting electron beam exposure or nano-imprinting.
Further, the light emitting layer corresponding to each red light emitting subunit is a red light monochromatic light source or a white light source, the light emitting layer corresponding to each green light emitting subunit is a green light monochromatic light source or a white light source, and the light emitting layer corresponding to each blue light emitting subunit is a blue light monochromatic light source or a white light source.
The invention has the following beneficial effects: the invention adopts the scheme of the super-surface microcavity, light emitted by the light emitting layer is incident to the metal film layer, one part of the light is transmitted, one part of the light is reflected, the reflected light is reflected by the metal backlight layer to be transmitted and reflected again, the process is repeated continuously, the transmission and the reflection of the metal film layer to the incident light both have polarization conversion effects, so that the recycling of photons is realized, the theoretical transmittance of the light can reach 100%, and the light can far exceed the design index of the traditional polarizing device even if the factors such as actual loss and the like are considered, so that the light emitting device has higher polarization and transmittance compared with the traditional scheme.
Drawings
FIG. 1 is a schematic diagram of a polarization structure of the present invention.
FIG. 2 is a schematic view of the surface structure of the metal film layer of the present invention.
Fig. 3 is a schematic diagram of the transmission performance of the red light emitting subunit of the present invention.
Fig. 4 is a schematic diagram of the transmission performance of the green light-exiting subunit of the present invention.
Fig. 5 is a schematic diagram of the transmission performance of the blue light emitting subunit of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples.
Example 1
One embodiment of the present invention, which is primarily a super-surface microcavity solution, attempts to achieve photon recycling. If the non-radiative loss of the light source is not considered, the WPE theoretical efficiency can reach 100%, and even if factors such as actual loss are considered, the WPE theoretical efficiency can far exceed the design index of the traditional polarizing device. Specifically, by the design of the micro-nano structure, when longitudinal TE waves are incident, the transmission is still TE waves, and when transverse TM waves are incident, the transmission polarization direction is rotated by 90 degrees to convert the TE waves into the TE waves. Therefore, the present embodiment can realize the TE polarization transmission of the same RGB three colors and mix the three colors into white light, the theoretical transmittance is 100%, and the degree of polarization DOP (DOP is defined as (Iy-Ix)/(Iy + Ix), Iy is the intensity of the TE wave, Ix is the intensity of the TM wave) is also quite high.
In order to achieve the above purpose, as shown in fig. 1, the present embodiment includes a metal film layer 1, a light emitting layer 2, a metal backlight layer 3, and a substrate layer 4, which are sequentially stacked, wherein the substrate layer 4 serves as a substrate, the metal backlight layer 3 is used to reflect light, the light emitting layer 2 serves as a light source, and the metal film layer 1 is used to convert polarized light. In this embodiment, the substrate layer 4 is a silicon oxide substrate; the metal backlight layer 3 is made of metal aluminum, is obtained by adopting electron beam evaporation or magnetron sputtering on the substrate layer 4, and can also be made of other high-reflection metal materials (such as silver); the light emitting layer 2 can be a white light source or an RGB single-color light source, and can be realized by adopting an LED or an OLED; the metal film layer 1 is made of a metal material having as low absorption as possible and strong plasmon resonance effect, and is made of metal silver in this embodiment, and is formed by electron beam evaporation or magnetron sputtering on the light emitting layer 2.
Referring to fig. 1 and 2, the metal film layer 1 is divided into a plurality of rectangular areas, and each rectangular area is used as a red light emitting subunit, a green light emitting subunit or a blue light emitting subunit. Three gratings are arranged in each rectangular area, namely a first grating which is longitudinally arranged and a second grating and a third grating which are transversely arranged, wherein the first grating is longitudinally arranged between the second grating and the third grating, and the second grating and the third grating respectively extend transversely in opposite directions from the two longitudinal ends of the first grating. These grating structures can be made by electron beam exposure or nanoimprint on the metal film layer 1. The red light emitting subunit, the green light emitting subunit or the blue light emitting subunit are mixed to emit white light, and the light emitting layer light source corresponding to each emitting subunit is a corresponding RGB single-color light source or a corresponding white light source.
Specifically, in the structural dimension, the thickness of the metal film layer 1 is t, is 140-160 nm, and is preferably 150 nm. The transverse length of each rectangular area is p, the longitudinal length of each rectangular area is d, the lengths of the slotted holes of the first grating, the second grating and the third grating are l, the widths of the slotted holes are w, the groove depths of the second grating and the third grating are t, the groove depth of the first grating is h, and 2l-w < p and 2w + l < d.
When the grating structures are in different sizes, different transmission effects can be generated for different emergent light. According to the experiment, when the rectangular area is used as the red light emitting subunit, values should be taken in the ranges of p being 360-; when the rectangular area is used as a green light emitting subunit, values should be taken in the ranges of p being 330-360nm, d being 330-360nm, h being 35-60nm, w being 60-70nm and l being 160-190nm on the premise that 2l-w < p and 2w + l < d are satisfied, and the transmittance of green light emission can reach 54.2% at the most, specifically as shown in fig. 4, the degree of polarization DOP reaches 92.4% at the most; when the rectangular region is used as a blue light emitting subunit, values should be taken in the ranges of p being 280-330nm, d being 300-330nm, h being 65-80nm, w being 40-55nm, and l being 145-180nm on the premise that 2l-w < p and 2w + l < d are satisfied, and the transmittance of blue light emission can reach 39.8% at the maximum, as shown in fig. 5, the degree of polarization DOP reaches 98.9% at the maximum.
The above description is only a preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a polarization white light of micro-nano structure goes out device, goes out subunit, green glow and blue light and goes out subunit and mix emergent white light through ruddiness, its characterized in that:
the metal film layer, the light emitting layer, the metal backlight layer and the substrate layer are sequentially stacked, the substrate layer serves as a substrate, the metal backlight layer is used for reflecting light, the light emitting layer serves as a light source, and the metal film layer is used for converting polarized light; setting the thickness of the metal film layer as t, wherein the t is 140-160 nm;
the metal film layer is divided into a plurality of rectangular areas, and each rectangular area is used as a red light emitting subunit, a green light emitting subunit or a blue light emitting subunit; setting the transverse length of each rectangular area as p and the longitudinal length as d;
three gratings are arranged in each rectangular area, namely a first grating which is longitudinally arranged and a second grating and a third grating which are transversely arranged, wherein the first grating is longitudinally arranged between the second grating and the third grating, the second grating and the third grating respectively extend transversely from two longitudinal ends of the first grating in opposite directions, the lengths of the slotted holes of the first grating, the second grating and the third grating are all l, the widths of the slotted holes are all w, the groove depths of the second grating and the third grating are t, and the groove depth of the first grating is h;
when the rectangular area is used as a red light emitting subunit, values should be taken in the ranges of p being 360-;
when the rectangular area is used as a green light emitting subunit, values are taken in the ranges of p being 330-360nm, d being 330-360nm, h being 35-60nm, w being 60-70nm and l being 160-190nm on the premise of meeting 2l-w < p and 2w + l < d;
when the rectangular region is used as a blue light emitting subunit, the value should be taken within the range of p being 280-330nm, d being 300-330nm, h being 65-80nm, w being 40-55nm, l being 145-180nm on the premise of satisfying 2l-w < p and 2w + l < d.
2. The polarized white light emitting device of the micro-nano structure according to claim 1, wherein t is 150 nm.
3. The polarized white light emitting device of a micro-nano structure according to claim 1, wherein the substrate layer is a silicon oxide substrate.
4. The polarized white light emitting device of the micro-nano structure according to claim 1, wherein the metal backlight layer is made of aluminum or silver.
5. The polarized white light emitting device of the micro-nano structure according to claim 1, wherein the metal film layer is made of metal silver.
6. The polarized white light emitting device of the micro-nano structure according to claim 1, wherein the light emitting layer is an LED or OLED light source.
7. The polarized white light emitting device of a micro-nano structure according to claim 1, wherein the metal backlight layer is obtained by electron beam evaporation or magnetron sputtering on the substrate layer.
8. The polarized white light emitting device of the micro-nano structure according to claim 1, wherein the metal film layer is obtained by electron beam evaporation or magnetron sputtering on the light emitting layer.
9. The polarized white light emitting device of a micro-nano structure according to claim 1, wherein a grating structure in each rectangular region is fabricated on the metal film layer by electron beam exposure or nanoimprint.
10. The polarized white light emitting device of the micro-nano structure according to any one of claims 1 to 9, wherein the light emitting layer corresponding to each red light emitting subunit is a red light monochromatic light source or a white light source, the light emitting layer corresponding to each green light emitting subunit is a green light monochromatic light source or a white light source, and the light emitting layer corresponding to each blue light emitting subunit is a blue light monochromatic light source or a white light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210084304.5A CN114551696A (en) | 2022-01-20 | 2022-01-20 | Micro-nano structured polarized white light emitting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210084304.5A CN114551696A (en) | 2022-01-20 | 2022-01-20 | Micro-nano structured polarized white light emitting device |
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| CN114551696A true CN114551696A (en) | 2022-05-27 |
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| CN202210084304.5A Pending CN114551696A (en) | 2022-01-20 | 2022-01-20 | Micro-nano structured polarized white light emitting device |
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- 2022-01-20 CN CN202210084304.5A patent/CN114551696A/en active Pending
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