CN206863264U - Anti-blue light eyeglass, glasses, the equipment of a kind of colour balance - Google Patents
Anti-blue light eyeglass, glasses, the equipment of a kind of colour balance Download PDFInfo
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- CN206863264U CN206863264U CN201720296337.0U CN201720296337U CN206863264U CN 206863264 U CN206863264 U CN 206863264U CN 201720296337 U CN201720296337 U CN 201720296337U CN 206863264 U CN206863264 U CN 206863264U
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Abstract
The utility model discloses a kind of anti-blue light eyeglass of colour balance, including eyeglass body, eyeglass body front deposition has the all-dielectric multilayer-film heap with two selective transmission attenuation band characteristics, in the broadband antireflective multilayer thin film stack of back lens surface deposition visible light wave range；The all-dielectric multilayer-film heap is made up of the high-index material film layer and low-index material film layer being arranged alternately, and the first layer and outermost layer wherein in all-dielectric multilayer-film heap close to eyeglass body are high-index material film layer；The broadband antireflective multilayer thin film stack is made up of the high-index material film layer and low-index material film layer being arranged alternately, wherein the first layer close to eyeglass body is high-index material film layer, outermost layer is low-index material film layer.The suitable high low-index film of the utility model selection is designed to decay in specific high energy blue wave band and transmitted, and its complementary color wave band carries out respective attenuation compensation, so as to realize the distortionless anti-blue light human eye protection of colour balance.
Description
Technical field
It the utility model is related to a kind of lifestyle device, and in particular to anti-blue light eyeglass, glasses, the equipment of a kind of colour balance,
It can be applied to the fields such as display, life medical science.
Background technology
Display screen or illuminator in the market is often realized using white light LEDs, because LED light source has low pressure
The advantages of power supply, power consumption are less, strong applicability, stability are high, the response time is short, environmentally safe, multicolor luminous etc..It is and current
It is to add the mode of YAG fluorescent powder to realize with gallium-nitride blue LED to prepare the most frequently used mode of white light LEDs.Gallium-nitride blue LED
Radiation spectrum intensity focus primarily upon 400-500nm scopes, peak radiant intensity is confined near 415-455nm.It is this white
Light LED radiation spectrum intensity especially has very strong radiation intensity in blue light in low energy blue wave band.According to Einstein
Theory understands that wavelength is shorter, and energy is then stronger；Thus the greenish-yellow feux rouges of energy ratio of short wavelength's blue light is much better than, therefore it is to people
The injury of eye is also just much bigger.If human eye is had been under the irradiation of high energy blue light, it will visual fatigue, macula retinae become
Venereal disease becomes, even results in the symptoms such as visual impairment.So the concept of anti-blue light is ready to appear in recent years, the eyeglass of anti-blue light
Largely pour into market.
In general anti-blue light eyeglass, it is the high energy blue light by removing portion of energy in the blue region of short wavelength, so as to
Reduce its injury to human eye.However, because anti-blue light eyeglass filters out part short-wave band, thus through anti-blue light eyeglass institute
The image for being in is often partially yellow, and the transmission visual effect of part anti-blue light glasses then turns yellow significantly, and this is imitated for image vision itself
Fruit has tremendous influence.For example, white pattern transfers anti-blue light eyeglass can then become faint yellow or yellow；Bluish-green colored pattern
It can then become green etc. through anti-blue light eyeglass.Thus current anti-blue light eyeglass or the meeting distortion of glasses color, can not do
To colour balance.
Utility model content
The utility model provides a kind of anti-blue light eyeglass of colour balance, and glasses and equipment with the eyeglass, profit
Human eye can be greatly protected with the eyeglass to prevent the injury of high energy blue light that the equipment of LED light source is emitted, and simultaneously
The undistorted effect of transmitted colors is ensure that, ensure that colour balance.
The utility model additionally provides a kind of preparation method of the anti-blue light eyeglass of colour balance, and this method need to be only used to true
Empty deposition technique, the complex technologys such as electron beam exposure, laser direct-writing or nano impression being avoided, whole method and step is simple,
Suitable for industrialized production.
A kind of anti-blue light eyeglass of colour balance, including eyeglass body, eyeglass body front deposition have with two choosings
Select all-dielectric multilayer-film heap of the Transmission Attenuation with characteristic (filter out band with high energy blue light and match gold-tinted and filter out band), the mirror
Piece bulk material is common blank glass or resin, in the broadband antireflective multilayer film of back lens surface deposition visible light wave range
Heap.The anti-blue light eyeglass of the colour balance meets：
It is less than or equal to 65% in 420nm~450nm wave bands transmitance；
It is less than or equal to 70% in 565nm~595nm wave bands transmitance；
It is more than or equal to 85% in 460nm~555nm wave bands transmitance；
It is more than or equal to 85% in 605nm~700nm wave bands transmitance；
It is less than or equal to 1% in 300nm~380nm wave bands transmitance；
The chromaticity coordinates of overall transmitted spectrum close to center white point (0.333,0.333), i.e., positioned at (0.333 ± 0.005,
0.333 ± 0.005) in the range of.
Preferably, the anti-blue light eyeglass of the colour balance meets：
It is 55%~65% in 420nm~450nm wave bands transmitance；
It is 60%~70% in 565nm~595nm wave bands transmitance；
It is 85%~100% in 460nm~555nm wave bands transmitance；
It is 85%~100% in 605nm~700nm wave bands transmitance；
It is less than or equal to 1% in 300nm~380nm wave bands transmitance；
The chromaticity coordinates of overall transmitted spectrum close to center white point (0.333,0.333), i.e., positioned at (0.333 ± 0.005,
0.333 ± 0.005) in the range of.
In the utility model, optical characteristics and anti-indigo plant of the in general without the membrane system that the special membrane system on two pieces of eyeglasses is realized
Light microscopic piece has significantly different.In general anti-blue light eyeglass, it is only necessary to filter out part in shortwave blue wave band (410nm~455nm)
The shortwave high energy blue light of energy.And the eyeglass in a kind of anti-blue light eyeglass device of colour balance of the utility model is in visible light wave range
There are special spectral modulation characteristic and colour balance requirement in the range of 400nm~700nm.
(1) it is less than or equal to 65% in specific band 420nm~450nm wave bands transmitance.The wave band is white LED light source height
Energy blue ray radiation intensity highest wave band, this wave band are also bigger to the infringement caused by human eye.If we are this ripple
The energy efficient decay of section, it is possible to allow infringement of the white LED light source containing a large amount of high energy blue lights to human eye to substantially reduce.
However, in order to ensure enough blue light transmitances, we can not be too low by the transmitance setting of the wave band.Therefore, we will
The wave band transmitance is set smaller than the scope equal to 65%, ensures to reduce high energy blue light as far as possible to people while certain pass through
The infringement of eye.
(2) it is less than or equal to 70% in specific band 565nm~595nm wave bands transmitance.The wave band is foregoing (1) setting
The complementary color yellow band of high energy blue light specific band, after the special wave band of (1) setting is filtered out, to ensure entirety through color not
Generation distortion, it is necessary to certain decay matching is carried out in 565nm~595nm wave bands.Therefore, we set the wave band transmitance
The scope less than or equal to 70% is set to, colour cast problem caused by high energy blue light is filtered out with compensation, the visual of fidelity colour balance is presented
The world.
(3) it is more than or equal to 85% in 460nm~555nm wave bands transmitance.It is for reality that the spectral characteristic of this wave band, which is set,
Existing remaining blue wave band and green light band energy passes through eyeglass, is perceived so as to not influence colour vision of the human eye to blueness and green.
(4) it is more than or equal to 85% in 605nm~780nm wave bands transmitance.It is for reality that the spectral characteristic of this wave band, which is set,
Existing red spectral band energy passes through eyeglass, is perceived so as to not influence the red colour vision of human eye.
(5) it is less than or equal to 1% in 300nm~380nm wave bands transmitance.It is to realize that the spectral characteristic of this wave band, which is set,
The full cut-off of ultraviolet band energy, so as to prevent infringement of the ultraviolet light to human eye, protect human eye.
(6) chromaticity coordinates of overall visible light wave range 400nm~700nm transmitted spectrums close to center white point (0.333,
0.333), i.e., in the range of (0.333 ± 0.005,0.333 ± 0.005).The setting of this chromaticity coordinates requirement, is in order to more preferable
Matching colour balance, reach the effect of color fidelity.
A kind of optical characteristics of the selective transmission of the anti-blue light eyeglass device of colour balance of the utility model is by mirror
Piece surface deposits high low refractive index dielectric membrane stack (HL)sTo realize.Multilayer thin film stack now can cause 420nm~450nm ripples
Section, the decay of 565nm~595nm wave bands Energy Efficient, so as to reduce injury and compensation blue region of the high energy blue light to human eye
Colo(u)r bias caused by decay, the transmission effect of colour balance is ensure that, while the light of remaining wave band almost can be efficiently by protecting
The color and information of remaining wave band are demonstrate,proved.The broadband anti-reflection membrane system of back lens surface can cause through eyeglass light more
Side large angle incidence is caused not enter human eye to the energy of back lens surface simultaneously into human eye, so as to avoid dazzle et al.
The uncomfortable situation of eye, improve the usage experience of Integrated lenses.
In the utility model, the all-dielectric multilayer-film heap is by the high-index material film layer and low-refraction that are arranged alternately
Film layer forms, first layer and outermost as close eyeglass body in further preferred, described all-dielectric multilayer-film heap
Layer is high-index material film layer；The broadband antireflective multilayer thin film stack by the high-index material film layer that is arranged alternately and
Low-index material film layer forms, and outermost layer is low-index material film layer.
In general, (HL)sIn membrane system, high-index material can select titanium dioxide, hafnium oxide, tantalum pentoxide,
Silicon nitride, zinc sulphide；More preferably titanium dioxide.Low-index material can select silica, alundum (Al2O3), fluorine
Change magnesium or other fluorides；More preferably silica.Lens materials can select white glass, K9 glass, BK7 glass,
Epoxy resin, ZF6 glass, ultraviolet vitreous silica, ZF52, lucite (acrylic, PMMA, polymethyl methacrylate etc.),
CR-39 (polypropylene-base diglycol carbonates), PC (poly- second carbonic ester), PS (polystyrene).According to selected high low-refraction
Material and lens materials, can be according to required transmitted spectrum characteristic, and optimization design goes out required physical dimension.
In general, broadband anti-reflection membrane system is by high low refractive index dielectric membrane stack (HL)sComposition, high-index material can be selected
Select titanium dioxide, hafnium oxide, tantalum pentoxide, silicon nitride, zinc sulphide；More preferably titanium dioxide.Low-refraction material
Material can select silica, alundum (Al2O3), magnesium fluoride or other fluorides；More preferably silica.
Preferably, in multilayer dielectricity membrane system, high-index material be selected from titanium dioxide, hafnium oxide, tantalum pentoxide,
Silicon nitride, zinc sulphide；Namely the high-index material film layer is selected from titanium oxide film layer, hafnium oxide film layer, five oxidations two
Tantalum film layer, silicon nitride film layer, zinc sulphide film layer.The low-index material is selected from silica, alundum (Al2O3), magnesium fluoride,
Namely the low-index material film layer is selected from silica coating, alundum (Al2O3) film layer, magnesium fluoride film layer.Preferably,
The low-index material is silica；The high-index material is titanium dioxide；I.e. described high-index material film
Layer choosing is selected from silica coating from titanium oxide film layer, the low-index material film layer.
The anti-blue light glasses that the utility model provides colour balance are equipped, including the color described in any of the above-described technical scheme is put down
The anti-blue light eyeglass of weighing apparatus.
The utility model additionally provides a kind of preparation method of the anti-blue light glasses of colour balance, comprises the following steps：
(1) for selected high low-index material, lens materials, according to the center of the selective transmission attenuation band of determination
Wavelength and bandwidth, the transmission requirement of remaining wave band and colour balance requirement, optimization design go out with selective transmission decay spectrum
The assembly of thin films of characteristic and the broadband antireflective assembly of thin films of visible light wave range；
(2) as needed, two pieces of eyeglasses are carried out into wiping respectively with ethanol, acetone to clean；
(3) by two pieces of eyeglasses simultaneously be placed in vacuum coating equipment, control deposition parameter, eyeglass front deposition by
(1) the multilayer dielectricity membrane system with selective transmission attenuation spectral dependency of design gained, obtains all-dielectric multilayer-film heap；
(4) two pieces of eyeglass turn-overs are placed in vacuum coating equipment, control deposition parameter, eyeglass backside deposition by
(1) the visible ray broadband antireflective assembly of thin films of design gained, obtains the broadband antireflective multilayer thin film stack of visible light wave range.
(5) the anti-blue light eyeglass of colour balance is obtained, the eyeglass prepared is arranged on mirror holder, mirror pin is mixed, obtains color
The anti-blue light glasses of balance.
As preferable combination：The high-index material is titanium dioxide, and the low-index material is silica,
The lens materials are white glass, and the number of plies of the all-dielectric multilayer-film heap is 5~30 layers, the individual layer layer of high refractive index material layer
Thickness is 1~140nm, and the individual layer thickness of low refractive index material layer is 10~250nm.
As still more preferably, deposition (thickness) parameter of the all-dielectric multilayer-film heap of front lens surface deposition is：
And the chromaticity coordinates of overall transmitted spectrum is (0.332,0.337).
When from the design of broadband antireflective assembly of thin films, as preferable combination：The high index of refraction material
Expect for titanium dioxide, the low-index material is silica, and the lens materials are white glass, described broadband anti-reflection
The number of plies for penetrating multilayer thin film stack is 3~15 layers, and the thickness per floor height refraction materials is 5~80nm, every layer of low-index material
Thickness is 5~120nm.
As further preferred, deposition (thickness) parameter of the broadband antireflective multilayer thin film stack of back lens surface deposition is：
The anti-blue light eyeglass of colour balance of the present utility model employs the method for double shallow negative filters to specific blue light spoke
Penetrate peak band and carry out matching filtering so as to the low energy blue light being balanced, while it is short to filtering out to filter out the realization of some yellow light spectrum
The effective compensation of wavelength blue spectrum is so that it is guaranteed that color is undistorted.A kind of anti-blue light eyeglass of colour balance of the utility model retains
Distortionless color effect, has a wide market prospects.
Eyeglass and equipment configuration of the present utility model are simple, stable performance, environment-friendly, are adapted in LED light source environment
Or used during LED light source device use, thus the utility model can provide a kind of color for the high use groups of electronic equipment and put down
The eyeshield scheme of weighing apparatus color fidelity, greatly avoid colony human eye caused by long-time high energy blue light and damage.
In summary, the anti-blue light glasses equipment of colour balance of the present utility model, it is ingenious filtered out have to human eye it is larger
The high energy blue wave band of injury, while use and filter out specific complementary color wave band and filtered out with compensating high energy blue wave band to through color
Distortion, it is achieved thereby that the distortionless anti-blue light protection of colour balance.The equipment substantially increases the color of anti-blue light glasses device
Effect is presented, it is ensured that most color information, have huge application prospect using electronic equipment colony to long-time.
Moreover, anti-blue light glasses equipment compact overall structure, the manufacturing process of colour balance of the present utility model are simple, cost is low, is easy to
On a large scale, mass production.Therefore the utility model is expected in field extensive uses such as display, life medical science.
Brief description of the drawings
Fig. 1 is the structural representation of the anti-blue light glasses of the utility model colour balance, wherein (a) is the anti-blue light of colour balance
The stereogram of glasses, (b) are the sectional view of the anti-blue light glasses of colour balance, and (c) is the disassembly diagram of the anti-blue light glasses of colour balance；
Fig. 2 is the manufacturing flow chart of the anti-blue light glasses of the utility model colour balance；
Fig. 3 is target optical spectrum in the anti-blue light eyeglass optimization process of the utility model colour balance；
Fig. 4 is that the utility model uses titanium dioxide, silica as high and low refractive index material, using white glass as mirror
Transmitted spectrum after the equal plated film in the anti-blue light glasses front back side of the colour balance of sheet material design.
Embodiment
The utility model is further described in detail below in conjunction with the accompanying drawings.
In Fig. 1 shown in (a)~(c), a kind of anti-blue light glasses of colour balance, by mirror holder 1, be fixed on mirror holder 1 two
2, two mirror pins 3 of block eyeglass, multilayer thin film stack 4 and multilayer thin film stack 5 form, and wherein multilayer thin film stack 4 is deposited on the front of two pieces of eyeglasses 2
(we define the side away from eye as front), multilayer thin film stack 5 are deposited on the back side of two pieces of eyeglasses 2, and two pieces of eyeglasses can be with
It is plano lens, concave lens or hyperopic lens.
In the utility model, optical characteristics and anti-indigo plant of the in general without the membrane system that the special membrane system on two pieces of eyeglasses is realized
Light microscopic piece has significantly different.In general anti-blue light eyeglass, it is only necessary to filter out part in shortwave blue wave band (410nm -455nm)
The shortwave high energy blue light of energy.And the eyeglass in a kind of anti-blue light eyeglass device of colour balance of the utility model is in visible light wave range
There are special spectral modulation characteristic and colour balance requirement in the range of 400nm -700nm.
The anti-blue light glasses equipment of colour balance of the present utility model, it is ingenious to have filtered out the high energy having to human eye compared with major injury
Blue wave band, at the same use filter out specific complementary color wave band with compensate high energy blue wave band filter out to through color distortion, so as to
Realize the distortionless anti-blue light protection of colour balance.Effect is presented in the color that the equipment greatly improves existing anti-blue light glasses device
Fruit, it is ensured that most color information, have huge application prospect using electronic equipment colony to long-time.Moreover,
Anti-blue light glasses equipment compact overall structure, the manufacturing process of colour balance of the present utility model are simple, and cost is low, is easy to advise greatly
Mould, mass production.Therefore the utility model is expected in field extensive uses such as display, life medical science.
The anti-blue light lens structure of colour balance of the present utility model, it can also be used in other equipment, such as with eyeglass
Helmet structure etc..
As shown in Fig. 2 a kind of manufacture method of the anti-blue light glasses equipment of colour balance, comprises the following steps：
1) high and low refractive index material, lens materials are selected, according to the centre wavelength of the selective transmission attenuation band of determination and
(customized parameter that can be according to demand determines, also can basis for bandwidth, the transmission requirement of remaining wave band and colour balance requirement
Many experiments determine that the utility model selected parameter is determined by substantial amounts of sample), optimization design, which goes out, has selection saturating
The assembly of thin films and visible ray broadband anti-reflection membrane system of attenuation spectral dependency are penetrated, it is more so as to be obtained using existing simulation software
The precipitation parameters such as tunic system high and low refractive index material, plated film order, coating film thickness and coating layers；
Object penetrating spectrum in process of optimization is as shown in Figure 3.Target optical spectrum is arranged to 420nm -450nm scopes
Interior≤65% transmission, in the range of 565nm -595nm≤transmission of 70% transmission, in the range of 460nm -555nm >=85%,
In the range of 605nm -700nm >=transmission of 85% transmission, in the range of the 300nm -380nm≤1%, chromaticity coordinates of overall transmitted spectrum
In the range of (0.333 ± 0.005,0.333 ± 0.005).
It is as further preferred parameter：Target optical spectrum be arranged to transmissivity in the range of 420nm~450nm for 55~
65%th, the transmissivity in the range of 565nm~595nm be 60~70%, the transmissivity in the range of 460nm~555nm be 85~
100%th, the transmissivity in the range of 605nm~700nm be 85~100%, in the range of 300nm~380nm≤it is 1% transmission, overall
The chromaticity coordinates of transmitted spectrum is located in the range of (0.333 ± 0.005,0.333 ± 0.005), the chromaticity coordinates position of overall transmitted spectrum
In the range of (0.333 ± 0.005,0.333 ± 0.005).
In the present embodiment, high-index material is titanium dioxide, and low-index material is silica, and lens materials are white
Glass, what the front lens surface obtained by emulation mode deposited has the deposition parameter of the multilayer dielectricity membrane system of selection attenuation function
For：
In back lens surface, high-index material is titanium dioxide, and low-index material is silica, and back lens surface deposits
The deposition parameter of visible waveband broadband anti-reflection membrane system be：
| Film layer | Material | Thickness/nm |
| 1 | TiO2 | 7.29 |
| 2 | SiO2 | 47.41 |
| 3 | TiO2 | 24.18 |
| 4 | SiO2 | 21.08 |
| 5 | TiO2 | 72.88 |
| 6 | SiO2 | 10.38 |
| 7 | TiO2 | 29 |
| 8 | SiO2 | 90.47 |
In above-mentioned parameters of film, first layer is that layer close to eyeglass.
2) two pieces of eyeglasses are carried out into wiping respectively with ethanol, acetone to clean；
3) two pieces of eyeglasses are placed in vacuum coating equipment simultaneously, control deposition parameter, be sequentially depositing in the front of eyeglass
By the multilayer dielectricity membrane system with selection attenuation function for 1) designing gained；
4) two pieces of eyeglass turn-overs are placed in vacuum coating equipment, control deposition parameter, be sequentially depositing at the back side of eyeglass
By the visible light wave range broadband anti-reflection membrane system for 1) designing gained.
5) eyeglass prepared is arranged on mirror holder, mirror pin is mixed, so as to obtain a kind of colour balance of the utility model
Anti-blue light glasses are equipped.
Transmitted spectrum after the anti-blue light front lens surface back side coating film of the colour balance finally obtained is as shown in Figure 4.It can see
Arrive, each spectrum for transmiting rejection zone more coincide with target optical spectrum, shows good sideband filtering feature；High wave transparent section is put down
Equal transmissivity is more than 85%, illustrates that enough light can enter eyeglass, and chromaticity coordinates for (0.332,0.337) almost with center
White point (0.333,0.333) overlaps, thus the anti-blue light eyeglass of colour balance has the undistorted effect of good color.
Claims (5)
1. a kind of anti-blue light eyeglass of colour balance, including eyeglass body, it is characterised in that eyeglass body front deposition has tool
There is the all-dielectric multilayer-film heap of two selective transmission attenuation band characteristics, in the broadband anti-reflection of back lens surface deposition visible light wave range
Penetrate multilayer thin film stack；The all-dielectric multilayer-film heap is by the high-index material film layer and low-index material film layer group that are arranged alternately
Into；The broadband antireflective multilayer thin film stack is by the high-index material film layer and low-index material film layer group that are arranged alternately
Into outermost layer is low-index material film layer；
Described high-index material film layer is selected from titanium oxide film layer, and the low-index material film layer is selected from silicon dioxide film
Layer；
Every thickness degree of the all-dielectric multilayer-film heap is：
Wherein " 1 " layer is one layer of close eyeglass body, and " 21 " layer is outermost layer.
2. the anti-blue light eyeglass of colour balance according to claim 1, it is characterised in that the broadband antireflective multilayer film
The number of plies of heap is 3~15 layers, and the individual layer thickness of high refractive index material layer is 5~80nm, the individual layer thickness of low refractive index material layer
For 5~120nm.
3. the anti-blue light eyeglass of colour balance according to claim 1, it is characterised in that the broadband antireflective multilayer film
Every thickness degree of heap is：
Wherein：" 1 " layer is one layer of close eyeglass body, and " 8 " layer is outermost layer.
4. a kind of anti-blue light glasses of colour balance, including eyeglass, it is characterised in that the eyeglass is any one of claim 1-3
The anti-blue light eyeglass of described colour balance.
5. the anti-blue light equipment of a kind of colour balance, it is characterised in that anti-including the colour balance described in claim any one of 1-3
Blue light eyeglass.
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| CN201720296337.0U CN206863264U (en) | 2017-03-24 | 2017-03-24 | Anti-blue light eyeglass, glasses, the equipment of a kind of colour balance |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270616A (en) * | 2018-10-25 | 2019-01-25 | 杭州灯之塔科技有限公司 | A kind of more paddy transmissive elements and preparation method thereof |
| CN112840263A (en) * | 2018-09-28 | 2021-05-25 | 豪雅镜片泰国有限公司 | Glasses lens |
| CN113703078A (en) * | 2021-08-31 | 2021-11-26 | 重庆文理学院 | Broadband antireflection film for visible light region and preparation method thereof |
-
2017
- 2017-03-24 CN CN201720296337.0U patent/CN206863264U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112840263A (en) * | 2018-09-28 | 2021-05-25 | 豪雅镜片泰国有限公司 | Glasses lens |
| CN109270616A (en) * | 2018-10-25 | 2019-01-25 | 杭州灯之塔科技有限公司 | A kind of more paddy transmissive elements and preparation method thereof |
| CN113703078A (en) * | 2021-08-31 | 2021-11-26 | 重庆文理学院 | Broadband antireflection film for visible light region and preparation method thereof |
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