CN111276593A - Wide color gamut backlight source for display - Google Patents
Wide color gamut backlight source for display Download PDFInfo
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- CN111276593A CN111276593A CN202010105865.XA CN202010105865A CN111276593A CN 111276593 A CN111276593 A CN 111276593A CN 202010105865 A CN202010105865 A CN 202010105865A CN 111276593 A CN111276593 A CN 111276593A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
- H01L33/504—Elements with two or more wavelength conversion materials
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
Abstract
The invention relates to the technical field of backlight sources, and particularly discloses a wide color gamut backlight source for display, which comprises a blue light LED chip and a composite fluorescent material; the composite fluorescent material comprises perovskite quantum dot glass ceramics and a red fluorescent film, wherein the core material in the perovskite quantum dot glass ceramics is CsPbBr3Quantum dots for generating a narrow-band green spectrum for display; the core component of the red fluorescent film is K2SiF6:Mn4+For producing a narrow-band red spectrum; in red, green and blue three-primary-color spectral components in the wide color gamut backlight source for display, the blue LED chip generates blue light components, and the blue LED excites CsPbBr3The quantum dot glass ceramics generate narrow-band green light components, and the blue light LED excites the red fluorescent film to generate narrow-band red light components. The invention effectively improvesThe whole luminous efficiency and the environmental stability of the device are improved, the service life is prolonged, and the use cost is reduced.
Description
Technical Field
The invention relates to the technical field of backlight sources, in particular to a wide color gamut backlight source for display.
Background
The LED is a novel green light source, and has been widely applied to various fields such as liquid crystal displays, backlight sources, general illumination and the like due to the advantages of small size, energy conservation, environmental protection, long service life, quick response, safety, environmental protection and the like. The definition of the color gamut coverage rate is that the area of a triangle formed by coordinates of three primary colors of RGB displayed by the display device accounts for the percentage of the whole CIE chromaticity space area. The NTSC (national television standards committee) standard is generally used in the industry, and the higher the NTSC color gamut value is, the more vivid the color of an object can be displayed by the display device, and the closer the color is to the color of a real object. Therefore, the development of fluorescent materials with high color purity is particularly important in the preparation of wide color gamut backlights.
The prior wide color gamut backlight source technology for display has the following advantages and disadvantages:
1. the mainstream white light LED light source is formed by matching a blue light LED chip with YAG (yttrium aluminum garnet): Ce3+Yellow phosphor, but because of the insufficient red and green components, the color rendering is low, the color gamut is low, only reaching 72% of NTSC. The short-range packaging easily causes serious problems such as yellow flower aging of organic matters;
2. blue, ultraviolet and near ultraviolet LED coupled commercial red and green phosphor technologies: conventional Eu3+ doped oxide Y2O3 and sulfur oxide Y2O2The problem that the absorption cross section is small and the quantum efficiency is low under the excitation of ultraviolet or near ultraviolet exists in S; eu developed in recent years2+Doped nitride CaAlSiN3And M2Si5N8(M ═ Ca, Sr, Ba) has an excessively broad emission spectrum and a low color purity, and is not suitable for use in the display field; k2SiF6：Mn4+(KSF:Mn4+) The method is a hotspot of the research of the narrow-band red fluorescent powder, effectively solves the problem of weather resistance by means of coating and the like, and can greatly improve the color gamut coverage rate of liquid crystal display. Primary commercial green fluorescenceThe light powder comprises: ce3+Doped Lu3Al5O12(LuAG)、Eu2+Doped Sr2SiO4The color gamut obtained by combining the red fluorescent powder and the green fluorescent powder with an LED chip is only 80% of NTSC, and the problem that packaging materials are easy to age also exists by adopting short-range coating packaging;
3. blue light LED coupling CdSe/ZnS and other II-VI group or InP/ZnS and other III-V group core-shell structure quantum dots: due to the excellent color purity of the quantum dots, the product obtained by the technical scheme reaches 105% of the NTSC standard, but the product has poor light effect, complex preparation process and flow, poor environmental stability, and short service life, and needs to be subjected to moisture-proof and anti-oxidation treatment;
4. all-inorganic halide perovskite CsPbX3The (X ═ Cl, Br, I) quantum dot material is gradually becoming a research hotspot in the display field due to the excellent luminescence characteristics, such as high luminous efficiency, high color purity, narrow-band emission, etc., but the only disadvantage is that it is not environment-friendly. In order to improve the stability of the quantum dots, researchers adopt methods such as mesoporous material coating and polymer material coating to isolate the quantum dots from the outside so as to improve the stability of the quantum dots. However, these methods cannot fundamentally improve CsPbX3The stability of the quantum dots;
the quantum dot fluorescent glass ceramics have excellent color stability and long-term material damage resistance, and can ensure good luminous performance under high-flux laser irradiation and thermal shock, so the glass ceramics have great application prospect in the field of power type white light LEDs and high-end display fields, and the research on the fluorescent glass ceramics converter becomes a hot spot, and a plurality of well-known institutions at home and abroad are engaged in the research on the aspect. The green material in the quantum dot glass exists the most excellent luminous performance, and the red light component lacking in the display is KSF: Mn which can be effectively excited by blue light4+Optimally, such a coupling may be up to 129% of the NTSC standard. Also important, the choice of building the backlight from a phosphor composite in a remote package can be madeThe influence of blue light wavelength on organic materials is effectively reduced;
5. at present, electroluminescent quantum dot diode (QLED) and electroluminescent organic diode (OLED) technologies are competitors to quantum dot glass LED backlight technologies, but the technology has obvious advantages over the above two display technologies: compared with the QLED technology, the perovskite quantum dot composite fluorescent material provided by the invention has the best compatibility with the existing liquid crystal display technology as the LED backlight technology, and has great advantages in the aspects of process, cost, stability and service life; compared with the OLED technology, the invention has the advantages of simple technical thought, high luminous efficiency, low cost, stable performance and long service life.
Disclosure of Invention
The invention aims to provide a wide color gamut backlight source for display, which is characterized in that a composite fluorescent material prepared from CsPbBr3 perovskite quantum dot microcrystalline glass and a KSF fluorescent film is matched with a blue LED (light-emitting diode) as the backlight source for display, so that the overall luminous efficiency and environmental stability of a device are effectively improved, the service life is prolonged, and the use cost is reduced.
In order to solve the technical problem, the invention provides a wide color gamut backlight source for display, which comprises a blue light LED chip and a composite fluorescent material;
the composite fluorescent material comprises perovskite quantum dot glass ceramics and a red fluorescent film, wherein the core material in the perovskite quantum dot glass ceramics is CsPbBr3Quantum dots for generating a narrow-band green spectrum for display; the core component of the red fluorescent film is K2SiF6:Mn4+For producing a narrow-band red spectrum;
in red, green and blue three-primary-color spectral components in the wide color gamut backlight source for display, the blue LED chip generates blue light components, and the blue LED excites CsPbBr3The quantum dot glass ceramics generate narrow-band green light components, and the blue light LED excites the red fluorescent film to generate narrow-band red light components.
Preferably, the full width at half maximum of the emission spectrum of the perovskite quantum dot glass ceramics is 20nm-40 nm; and the luminous quantum efficiency of the perovskite quantum dot glass ceramics is 50-95%.
Preferably, the composite fluorescent material is encapsulated on the LED chip.
Preferably, the glass composition material of the perovskite quantum dot glass ceramics is at least one of silicate, borosilicate, aluminosilicate, aluminoborosilicate, phosphate, phosphosilicate, germanate, silicate germanium, tellurate and bismuthate.
Preferably, the luminous quantum efficiency of the perovskite quantum dot glass ceramics can reach 85%; the luminous efficiency of the red fluorescent film can reach 95%.
Preferably, the composite fluorescent material is packaged remotely.
As a preferred scheme, one side of the red fluorescent glass in the fluorescent composite material is opposite to the LED blue light chip.
The invention has the following beneficial effects:
1. the wide color gamut backlight source for display of the perovskite quantum dot glass-ceramic composite fluorescent material for the blue light LED is compatible with the existing LED backlight source technology, and the performance is remarkably improved; the composite fluorescent material formed by spin-coating the red fluorescent film on the perovskite quantum dot glass adopts remote encapsulation in an actual backlight source system, so that the problem of organic matter aging is effectively reduced.
2. The perovskite quantum dot microcrystalline glass composite fluorescent material for the blue light LED has the advantages that the perovskite quantum fluorescent glass can effectively absorb ultraviolet light, near ultraviolet light and blue light and can emit efficient green light, the photoluminescence spectrum is narrow and highly symmetrical, the color purity is high, the red fluorescent film can effectively absorb the near ultraviolet light and the blue light, narrow-band red light is emitted, the color purity is high, the multicolor fluorescent composite material can be obtained by adjusting the thicknesses of the red fluorescent film and the quantum dot microcrystalline glass, and the perovskite quantum dot microcrystalline glass composite fluorescent material is combined with an LED excitation light source and is very suitable for displaying the wide-color-gamut backlight source.
3. The perovskite quantum dot microcrystalline glass composite fluorescent material used for the blue light LED has the advantages that the perovskite quantum dot microcrystalline glass has high luminous quantum efficiency of 85 percent, high color purity and half-peak width of 16 nm; the red fluorescent film has high luminous quantum efficiency of 95%, high color purity and half-peak width of 8 nm.
4. The invention provides a wide color gamut backlight source for display of a perovskite quantum dot microcrystalline glass composite fluorescent material for a blue light LED, which relates to a high-temperature solid phase method adopted by perovskite quantum dot microcrystalline glass, wherein quantum dot nanocrystals are uniformly embedded in a glass matrix, and the wide color gamut backlight source is suitable for being made into various shapes, simple in process and low in preparation cost; the red fluorescent film in the composite fluorescent material adopts a spin-coating method, so that the process is simple and the preparation cost is low.
5. According to the wide color gamut backlight source for display of the perovskite quantum dot microcrystalline glass composite fluorescent material for the blue LED, the perovskite quantum dots are embedded in the glass substrate and are not easily affected by the external environment, so that the environmental stability is good, the stability of the quantum dots is not improved by adopting a core-shell or coating method, the service life is prolonged, and the cost in the preparation process is reduced; the wide color gamut backlight source adopts a remote packaging technology, and effectively prevents the aging of the organic fluorescent film.
6. The wide color gamut backlight source for displaying the perovskite quantum dot microcrystalline glass composite fluorescent material for the blue light LED, which is provided by the invention, has the photoluminescence life of reaching 90ns, the response speed matched with that of the LED and no tailing problem in displaying.
In conclusion, the problems of low color gamut, low light efficiency, aging performance, need of special protective measures and high cost in the prior display technology can be effectively solved by applying the invention. The perovskite quantum dot glass ceramics and the red fluorescent film are combined, the remote packaging technology has excellent availability, and the perovskite quantum dot glass ceramics and the red fluorescent film are suitable for being applied to LED backlight sources for display with wide color gamut, high efficiency, low cost, good stability and high response speed.
Drawings
FIG. 1 is a schematic diagram of the luminescence spectra of a blue LED, green perovskite quantum dots and a red fluorescent thin film.
FIG. 2 is a diagram showing a ratio of red, green and blue light spectra outputted from the display.
FIG. 3 is a schematic diagram of the manner in which the composite phosphor material is combined with an LED.
FIG. 4 is an X-ray diffraction pattern of green perovskite quantum dots.
Fig. 5 is a high resolution transmission electron microscope image of green perovskite quantum dots.
Fig. 6 is an absorption spectrum of the quantum dot glass ceramics.
FIG. 7 is an emission spectrum of the quantum dot glass ceramics.
FIG. 8 is an excitation spectrum of a red fluorescent film.
FIG. 9 shows the emission spectrum of the red fluorescent film.
FIG. 10 is a graph of the luminescence spectrum of perovskite quantum dot glass ceramics at different temperatures.
FIG. 11 is a graph showing the emission spectra of a red fluorescent film at different temperatures.
FIG. 12 is a schematic diagram of color coordinates of a blue LED, green perovskite quantum dot glass ceramics excited by the blue LED and a red fluorescent film.
Reference numerals:
1. a blue LED; 2. a reflective cup; 3. a red light fluorescent film; 4. perovskite quantum dot glass ceramics; 5. a diffusion membrane; 6. a brightness enhancement film; 7. a dual brightness enhancement film; 8. an LCD panel.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The preferred embodiment of the invention provides a wide color gamut backlight source for display, which comprises a blue LED chip and a composite fluorescent material;
the composite fluorescent material comprises calciumThe titanium ore quantum dot glass ceramics and the red fluorescent film, wherein the core material in the perovskite quantum dot glass ceramics is CsPbBr3Quantum dots for generating a narrow-band green spectrum for display; the core component of the red fluorescent film is K2SiF6:Mn4+For producing a narrow-band red spectrum;
in red, green and blue three-primary-color spectral components in the wide color gamut backlight source for display, the blue LED chip generates blue light components, and the blue LED excites CsPbBr3The quantum dot glass ceramics generate narrow-band green light components, and the blue light LED excites the red fluorescent film to generate narrow-band red light components.
In a preferred embodiment of the invention, the full width at half maximum of the emission spectrum of the perovskite quantum dot glass ceramics is 20nm-40 nm; and the luminous quantum efficiency of the perovskite quantum dot glass ceramics is 50-95%.
In a preferred embodiment of the present invention, the composite fluorescent material is encapsulated on an LED chip.
In a preferred embodiment of the invention, the glass composition material of the perovskite quantum dot glass-ceramics is at least one of silicate, borosilicate, aluminosilicate, aluminoborosilicate, phosphate, phosphosilicate, germanate, silicon germanate, tellurate and bismuthate.
In a preferred embodiment of the invention, the luminescent quantum efficiency of the perovskite quantum dot glass ceramics can reach 85%; the luminous efficiency of the red fluorescent film can reach 95%.
In a preferred embodiment of the present invention, the composite fluorescent material is packaged remotely.
In a preferred embodiment of the invention, one side of the red fluorescent glass in the fluorescent composite material is opposite to the LED blue light chip.
Fig. 1 and fig. 2 are schematic diagrams of spectra of a backlight source obtained by combining a blue LED with a composite fluorescent material in a preferred embodiment of the present invention, where fig. 1 is a schematic diagram of light emission spectra of the blue LED, a green perovskite quantum dot, and a red fluorescent thin film, and fig. 2 is a schematic diagram of red, green, and blue light spectra output by a display in a certain ratio. As shown in FIG. 1 and FIG. 2, red, green, and,The spectrum of the blue three colors is very narrow, the color purity of each color is very high, and the full utilization of light rays is facilitated. Existing blue LED combined yellow YAG Ce3+The excessive spectral width in the phosphor technology and other red and green phosphor technologies combined with LEDs causes spectral waste in the color filter, and the color purity is not high enough and the response speed is slow, but the composite phosphor material combined with the blue LED provided in the preferred embodiment of the present invention has significant advantages as a backlight technology.
FIG. 3 is a schematic diagram of a manner of combining a composite fluorescent material with an LED according to a preferred embodiment of the present invention, and a blue LED1, a reflective cup 2, a red fluorescent thin film 3, a perovskite quantum dot glass ceramic 4, a diffusion film 5, a brightness enhancement film 6, a dual brightness enhancement film 7, and an LCD panel 8 are sequentially disposed; the composite fluorescent material is remotely packaged on the blue LED1, and the packaging mode is favorable for increasing heat dissipation and simultaneously reduces the thermal shock effect of organic matters. The red fluorescent film 3 in the embodiment is spin-coated on one surface of the perovskite quantum microcrystalline glass 4, and one surface of the red fluorescent film 3 is opposite to the blue LED1, so that the absorption rate of the green perovskite quantum dots on the blue light spectrum is reduced, and the output three primary colors spectrum is more uniform. The ratio of red light, green light and blue light is controlled by the liquid crystal light valve and the color filter together through the diffusion film 5, the brightness enhancement film 6, the double brightness enhancement film 7 and the LCD panel 8 with the filter inside.
FIGS. 4 and 5 are X-ray diffraction patterns (and high-resolution transmission electron micrographs) of green perovskite quantum dots in a preferred embodiment of the present invention, respectively3 BO 320～30％；SiO 220～40％；ZnO 10～20％；Cs2CO35～15％；Na2CO35～15％；PbBr210-20%; 5-15% of CsBr; mixing and grinding the components uniformly, heating to 1050 ℃ and 1150 ℃, and preserving heat for 10-20 minutes; and after the heat preservation is finished, quickly pouring the mixture into a mold, annealing at high temperature, preserving the heat at the glass heat treatment temperature T for 4-10 hours, then cooling to room temperature, and taking out to obtain the glass material. The obtained quantum dot microcrystalThe glass inherits the excellent optical property of the perovskite quantum dot and has high quantum efficiency. More importantly, the material has good stability, simple preparation process, easily obtained raw materials and low cost.
Fig. 6 is an absorption spectrum of the quantum dot glass ceramic in the preferred embodiment of the invention, and fig. 7 is an emission spectrum of the quantum dot glass ceramic. As shown in fig. 6, photons in a wide wavelength band shorter than the absorption cutoff wavelength can be obtained to excite the quantum dot glass-ceramic to emit light. As shown in fig. 7, the perovskite quantum dot glass ceramics do not exhibit a behavior in which the emission wavelength changes with the excitation wavelength due to the exciton emission characteristics, and are excellent in color stability. The emission spectrum is very narrow and is 21nm, the peak shape is highly symmetrical, the peak wavelength is 520nm, the efficiency of the luminescent quantum dot is up to 83.2% under 450nm, and the average luminescent life is 94.5 ns.
Fig. 8 and 9 are schematic diagrams of an excitation spectrum and an emission spectrum of a red fluorescent thin film with a certain thickness obtained by spin coating according to a preferred embodiment of the present invention, respectively, where fig. 8 is the excitation spectrum and fig. 9 is the emission spectrum. As shown in fig. 8, the effective excitation band of the red fluorescent film is mainly concentrated in the ultraviolet region and the blue region, matching with the current blue LED chip. As shown in FIG. 9, the emission peak of the fluorescent thin film is narrow and sharp under the excitation of the 450nm blue light band, the main peak wavelength is 631nm, and the emission quantum efficiency under the excitation of 450nm is 95%.
Fig. 10 and 11 are schematic diagrams respectively illustrating the temperature stability of the luminescence spectrum of the composite fluorescent material in the preferred embodiment of the present invention. As shown in FIG. 10, the luminescence spectrum of green perovskite quantum dot glass ceramics at different temperatures gradually decreases with the temperature change from 30 to 150 ℃, but the peak wavelength does not change and the peak shape remains unchanged. FIG. 11 shows the emission spectrum of the red fluorescent film at different temperatures, and the emission intensity gradually decreases with the temperature change from 30 to 150 ℃, but the peak wavelength does not change and the peak shape remains unchanged. The composite material is required to have corresponding temperature control management in the use process along with the temperature change so as to ensure the color stability of the red, green and blue matching.
Fig. 12 is a schematic diagram of color coordinates of a blue LED, a green perovskite quantum dot glass ceramic excited by the blue LED, and a red fluorescent thin film in a preferred embodiment of the invention. As shown in fig. 12, point a in the figure represents a blue color coordinate of a blue LED chip itself, point B represents a color coordinate of a narrow-band green light generated by the blue LED exciting the green perovskite quantum dot glass ceramic, and point C represents a narrow-band red color coordinate generated by the blue LED exciting the red fluorescent thin film. As can be taken from fig. 12, a very wide color gamut can be achieved, up to 128% of the NTSC color gamut standard.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (7)
1. A wide color gamut backlight for display, which is used for the backlight of a display, is characterized in that: the backlight source comprises a blue LED chip and a composite fluorescent material;
the composite fluorescent material comprises perovskite quantum dot glass ceramics and a red fluorescent film, wherein the core material in the perovskite quantum dot glass ceramics is CsPbBr3Quantum dots for generating a narrow-band green spectrum for display; the core component of the red fluorescent film is K2SiF6:Mn4+For producing a narrow-band red spectrum;
in red, green and blue three-primary-color spectral components in the wide color gamut backlight source for display, the blue LED chip generates blue light components, and the blue LED excites CsPbBr3The quantum dot glass ceramics generate narrow-band green light components, and the blue light LED excites the red fluorescent film to generate narrow-band red light components.
2. The method of manufacturing a wide color gamut backlight for display according to claim 1, wherein: the full width at half maximum of the emission spectrum of the perovskite quantum dot glass ceramics is 20nm-40 nm; and the luminous quantum efficiency of the perovskite quantum dot glass ceramics is 50-95%.
3. The method for manufacturing a wide color gamut backlight source for display according to claim 1, wherein the composite fluorescent material is encapsulated on an LED chip.
4. The method for manufacturing a wide color gamut backlight source for display according to claim 1, wherein the glass composition material of the perovskite quantum dot glass-ceramic is at least one of silicate, borosilicate, aluminosilicate, aluminoborosilicate, phosphate, phosphosilicate, germanate, silicate-germanate, tellurate and bismuthate.
5. The method for preparing a wide color gamut backlight source for display as claimed in claim 1, wherein the luminescent quantum efficiency of the perovskite quantum dot glass ceramics can reach 85%; the luminous efficiency of the red fluorescent film can reach 95%.
6. The method for preparing a wide color gamut backlight source for display according to claim 1, wherein the composite fluorescent material is packaged remotely.
7. The method for manufacturing a wide color gamut backlight source for display according to claim 1, wherein one surface of the red fluorescent glass in the fluorescent composite material faces the LED blue light chip.
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| CN202010105865.XA CN111276593A (en) | 2020-02-19 | 2020-02-19 | Wide color gamut backlight source for display |
| PCT/CN2020/081911 WO2021164103A1 (en) | 2020-02-19 | 2020-03-28 | Wide color gamut backlight source for display |
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| CN114315165A (en) * | 2021-11-17 | 2022-04-12 | 无锡极电光能科技有限公司 | Colored perovskite glaze glass, preparation method thereof and solar cell |
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| CN116875313A (en) * | 2023-06-21 | 2023-10-13 | 西北大学 | Narrow-band green fluorescent material and application thereof |
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| US10907092B2 (en) * | 2016-07-07 | 2021-02-02 | University Of Central Florida Research Foundation, Inc. | Methods of making highly stable perovskite-polymer composites and structures using same |
| CN107353899A (en) * | 2017-06-15 | 2017-11-17 | 华南理工大学 | A kind of Mn4+Doped fluoride monocrystalline red light material and preparation method and application |
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| CN108258099A (en) * | 2018-01-12 | 2018-07-06 | 惠州市华星光电技术有限公司 | A kind of quantum dot LED and preparation method |
| CN110471215A (en) * | 2018-05-11 | 2019-11-19 | 逢甲大学 | Quantum dot shows equipment |
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| CN114315165A (en) * | 2021-11-17 | 2022-04-12 | 无锡极电光能科技有限公司 | Colored perovskite glaze glass, preparation method thereof and solar cell |
| CN114315165B (en) * | 2021-11-17 | 2023-12-26 | 无锡极电光能科技有限公司 | Colored perovskite glaze glass, preparation method thereof and solar cell |
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