CN110534631B - Wide color gamut backlight source for display of LED combined perovskite quantum dot glass ceramics - Google Patents
Wide color gamut backlight source for display of LED combined perovskite quantum dot glass ceramics Download PDFInfo
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- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
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Abstract
The invention provides an LEDThe wide color gamut backlight source for display combined with the perovskite quantum dot glass ceramics is used for providing a light source for a display, the backlight source comprises an LED and the perovskite quantum dot glass ceramics, and the perovskite quantum dot glass ceramics comprise red light, green light and blue light perovskite quantum dot glass ceramics; the perovskite quantum dot microcrystalline glass material is CsPbX3(X ═ Cl, Br, I), or CsPb (Cl)xBr1‑x)3Or CsPb (Br)xI1‑x)3(ii) a The backlight spectrum contains the own blue light component of the blue light LED, and the blue light LED excites CsPbBr3Or CsPb (Br)xI1‑x)3Narrow line width green light component generated by quantum dot microcrystalline glass, and CsPbI excited by blue light LED3Or CsPb (Br)xI1‑x)3Narrow line width red light component generated by quantum dot glass ceramics; the backlight spectrum may also be such that the short wavelength LED, which contains an absorption cutoff wavelength below that of the quantum dots, excites blue CsPb (Cl)xBr1‑x)3Narrow-linewidth blue light component generated by quantum dot microcrystalline glass, short-wavelength or blue light LED excites CsPbBr3Or CsPb (Br)xI1‑x)3CsPbI excited by narrow-linewidth green light component, short-wavelength or blue light LED generated by quantum dot microcrystalline glass3Or CsPb (Br)xI1‑x)3Narrow line width red light component generated by quantum dot glass ceramics.
Description
Technical Field
The invention relates to the technical field of backlight sources, in particular to a wide color gamut backlight source for display, which combines an LED with perovskite quantum dot glass ceramics.
Background
The prior main technology and the advantages and the disadvantages of the prior wide color gamut backlight source for display are as follows:
1. blue light LED chip combined with Ce3+YAG yellow light fluorescent powder technology. The color gamut display technology is an existing mass production technology and has high technical maturity, but the defects that red light and green light components are insufficient, the color gamut is low and only reaches 72% of the color gamut standard of the National Television Standards Committee (NTSC), and the application of wide color gamut display cannot be met. FluorescencePowder and silica gel combinations are also prone to performance aging problems.
2. Blue, violet, or near ultraviolet LEDs combine commercial red and green phosphor technologies. The main commercial red phosphors: (1) y is2O3S:Eu3+And Y2O3S:Eu3+The red powder has small absorption section and low light effect under near ultraviolet excitation; (2) nitride red powder CaAlSiN3:Eu2+And M2Si5N8:Eu2+(M ═ Ca, Sr, Ba), divalent Eu2+The luminescent spectrum is too wide, which is not suitable for wide color gamut display application, and the synthesis condition of the fluorescent powder is harsh and the cost is high; (3) k2SiF6:Mn4+(KSF:Mn4+) Red powder, which has a narrow spectrum but poor stability under humid and hot conditions. In addition, some red phosphors emit light with a problem of long emission lifetime and display tailing. The main commercial green phosphors are: (1) ce3+:Lu3Al5O12Green powder, (2) Sr2SiO4:Eu2+Green powder, (3) Si6-xAlxOxN8-x:Eu2+(β-sialon:Eu2+) Green powder. The three green powders have the common characteristics of low light effect and wide spectrum, wherein the ratio of beta-sialon to Eu is2+The synthesis conditions of the green powder are strict and the cost is high. By combining the LED with the red fluorescent powder and the green fluorescent powder, the color gamut can only reach about 80% of the NTSC standard. Similarly, the combination of the phosphor and the silica gel is prone to performance degradation, and may cause display color deviation due to different degradation degrees of the red phosphor and the green phosphor.
3. The blue light LED chip is combined with CdSe/ZnS and other II-VI group or InP/ZnS and other III-V group core-shell structure quantum dot crystal powder and a film thereof: the technical scheme has a small amount of mass production, has the advantages of improving the color gamut to reach the NTSC standard of 105 percent, but has poor light effect, needs to manufacture a core-shell structure, has poor environmental stability and mechanical stability, needs special moisture-proof and anti-oxidation treatment, is easy to generate quantum dot displacement, and has short service life.
4. Perovskite CsPbX3(X ═ Cl, Br, I) quantum dot glass and its derivative CsPb (Cl)xBr1-x)3And CsPb (Br)xI1-x)3The quantum dot crystal powder and the quantum dot crystal film have the advantages of adjustable luminescence wavelength in a visible light range, narrow and symmetrical luminescence spectrum, high luminescence quantum efficiency, short luminescence service life, simple process, low cost and the like, but have poor environmental stability and mechanical stability, the luminescence performance is obviously reduced in air and damp and hot environments, and the position of a quantum dot is easy to move.
Perovskite CsPbX3(X ═ Cl, Br, I) quantum dot glass and its derivative CsPb (Cl)xBr1-x)3And CsPb (Br)xI1-x)3Quantum dot glass is a brand-new quantum dot material, and the application of quantum dot glass in white light LED illumination is discussed in the prior art. In the prior art, the application of the LED combined with perovskite quantum dot glass on display is to grind the glass into powder and combine the powder with silica gel or AB gel on an LED chip, so that the advantages of mechanical stability and thermal stability of the quantum dot glass are lost, and the larger particles of the quantum dot glass are difficult to meet the requirements of LED display packaging uniformity and precision. And a few researches utilize the combination of the LED chip and the green perovskite quantum dot glass and the combination of the red rare earth luminescent phosphor powder, which also partially loses the advantages of good environmental stability and mechanical stability of the quantum dot glass.
The existing II-VI and III-V quantum dot crystal powder and film backlight technology can manufacture a quantum dot film with a red, green and blue pixel pattern with a tiny size (about 25 mu m) by a pattern transfer technology such as imprinting, so that a color filter can be omitted, and the light efficiency is improved. At present, perovskite quantum dot glass is not suitable for the application of micro patterning, but the quantum dot glass does not need a core-shell structure, moisture protection and anti-oxidation treatment, and the environmental and mechanical stability is far better than that of the existing rare earth fluorescent powder, quantum dot crystal particles, quantum dot glass particles and films thereof; and the luminous quantum efficiency is very high, the luminous spectrum is very narrow (20-40nm), the spectrum is very symmetrical, it is very easy to match with the transmission spectrum of the color filter through adjusting the wavelength, thus red, green and blue light can all pass the color filter with high efficiency, its light loss is small.
5. There are two other wide gamut display technologies, electroluminescent quantum dot light emitting diode (QLED) and electroluminescent Organic Light Emitting Diode (OLED) technologies, that compete with quantum dot glass LED backlight technologies. Compared with the QLED technology, the perovskite quantum dot LED backlight source technology provided by the invention has great advantages in manufacturing process, cost, environment and mechanical stability. The current better service life of the QLED is 2-3 ten thousand hours, which is still slightly lower, and during the service life, the luminous efficiency is gradually attenuated, which causes the display performance to be reduced. The service life of the quantum dot glass in the quantum dot backlight technology provided by the invention can be equivalent to that of an LED (light-emitting diode), and can reach more than 10 ten thousand hours, and the display performance reduction in the period is far less than that of the QLED. Compared with the OLED technology, the quantum dot backlight technology provided by the invention has the advantages of wide light-emitting color gamut, high efficiency, simple manufacturing process, low cost, stable performance and long service life.
Disclosure of Invention
According to the technical problems that the existing rare earth fluorescent powder, quantum dot crystal particles, quantum dot glass particles and films thereof, the electroluminescent quantum dot light-emitting diode and the electroluminescent organic light-emitting diode are low in color gamut, low in light efficiency, trailing in display, ageing in performance, needing to manufacture a core-shell structure, needing special moisture-proof and anti-oxidation treatment, poor in environmental stability and mechanical stability and high in cost when applied to display, the wide color gamut backlight source for display of the LED combined with the perovskite quantum dot glass-ceramics is provided. The invention mainly utilizes the perovskite quantum dot microcrystalline glass and the LED as the backlight source for display, thereby improving the luminous quantum efficiency, the environmental stability and the mechanical stability, prolonging the service life and reducing the cost.
The technical means adopted by the invention are as follows:
the wide color gamut backlight source for the display of the perovskite quantum dot glass ceramic combined with the LED is used for providing a light source for a display, and comprises the LED and the perovskite quantum dot glass ceramic;
the quantum dots in the perovskite quantum dot glass ceramics material are core materials for generating narrow-linewidth red, green and blue three-primary-color spectrums for display, and comprise CsPbX3(X ═ Cl, Br, I), or CsPb (Cl)xBr1-x)3(x-0-1), or CsPb (Br)xI1-x)3(x＝0-1)；
The wide color gamut backlight source spectrum for display contains the self blue light component of the blue light LED, and the blue light LED excites CsPbBr3Or CsPb (Br)xI1-x)3(x is 0-1) narrow line width green light component generated by quantum dot glass ceramics, and the blue light LED excites CsPbI3Or CsPb (Br)xI1-x)3(x ═ 0-1) narrow line width red light component produced by quantum dot glass ceramics; the backlight spectrum may also be short wavelength LED excited blue CsPb (Cl) containing absorption cutoff wavelengths below the quantum dotsxBr1-x)3(x is 0-1) narrow line width blue light component generated by quantum dot glass ceramics, and short wavelength or blue light LED excites CsPbBr3Or CsPb (Br)xI1-x)3(x is 0-1) narrow line width green light component generated by quantum dot glass ceramics, and short wavelength or blue light LED excites CsPbI3Or CsPb (Br)xI1-x)3(x is 0-1) narrow line width red light component generated by quantum dot glass ceramics.
The luminescence peak wavelength of the perovskite quantum dot microcrystalline glass in the wide color gamut backlight source for display is easily adjusted to the wavelengths of red light, green light and blue light which are suitable for display application, the full width at half maximum of the luminescence spectrum of the quantum dot glass is narrow, the spectral symmetry is excellent, wherein the full width at half maximum is 20nm-40nm, the luminescence quantum efficiency is very high and can reach 45-90%, the environmental stability and the mechanical stability are good, the luminescence service life is short, the magnitude of 100ns is achieved, and no display tailing effect exists; the perovskite quantum dot glass ceramics is prepared by a high-temperature melting method, the process is simple, the cost is low, and the compatibility of an LED combined quantum dot glass backlight source technology and the existing backlight source technology is good. According to the experimental results: CsPbCl3Quantum dot purple light(peak wavelength of 400nm-430nm), CsPbBr3Quantum dot blue-green light (peak wavelength 500nm-530nm), CsPbI3The quantum dot red light (the peak wavelength is 660nm-700nm) can be used for adjusting the CsPb (Cl) in a wider range through different anion alloyingxBr1-x)3(x＝0-1)、CsPb(BrxI1-x)3(x is 0 to 1) and realizes all visible spectrum luminescence of 400nm to 760 nm.
The glass matrix material of the perovskite quantum dot glass ceramics in the wide color gamut backlight source for display is borate, borosilicate, borophosphate, aluminate, aluminosilicate, aluminoborosilicate, silicate, phosphate, phosphosilicate, tellurate, germanate, borogermanate, titanate, antimonate or arsenate.
Furthermore, the luminous quantum efficiency of the green perovskite quantum dot glass ceramics can reach 90%; the luminous quantum efficiency of the red perovskite quantum dot glass ceramics can reach 60 percent; the luminous quantum efficiency of the blue perovskite quantum dot glass ceramics can reach 45%.
Furthermore, the wide color gamut backlight source for display is an LED combined perovskite quantum dot microcrystalline glass side-entering type backlight source or an LED combined perovskite quantum dot microcrystalline glass direct type backlight source.
Further, when the wide color gamut backlight source for display is an LED combined perovskite quantum dot glass ceramic side-in type backlight source, the perovskite quantum dot glass ceramic is packaged on an LED chip, or on the side surface of a light guide plate, or on the back surface of the light guide plate in a packaging manner in the backlight source system.
Further, when the wide color gamut backlight source for display is an LED combined perovskite quantum dot microcrystalline glass direct-type backlight source, the perovskite quantum dot microcrystalline glass is packaged on an LED chip in a manner of being packaged in a backlight source system.
Further, the perovskite quantum dot glass ceramics are arranged in a laminated mode or in a single layer mode according to a certain proportion in a backlight source system.
Compared with the prior art, the invention has the following advantages:
1. the wide color gamut backlight source for display of the LED combined with the perovskite quantum dot microcrystalline glass is compatible with the existing LED backlight source technology, and the performance is remarkably improved; the LED combines perovskite quantum dot microcrystalline glass backlight, and in an actual backlight system, three packaging modes are provided, namely three application modes of packaging on an LED chip, packaging on the side surface of a light guide plate and packaging on the back surface of the light guide plate, and the corresponding packaging modes can be selected according to different applications.
2. The wide color gamut backlight source for the display of the LED combined perovskite quantum dot glass ceramics provided by the invention has the advantages that the perovskite quantum dot glass ceramics can strongly absorb exciting light shorter than a cut-off wavelength and emit green light, red light and blue light, the photoluminescence spectrum of the perovskite quantum dot glass ceramics is narrow and is distributed quite symmetrically, the spectral color purity is very high, the luminous wavelength of the red light, green light and blue light perovskite quantum dot glass ceramics can be adjusted to the wavelength of red, green and blue primary colors suitable for the display through the components and the size of quantum dots, and the perovskite quantum dot glass ceramics is combined with an LED excitation source and is very suitable for the wide color gamut backlight source for the display.
3. According to the wide color gamut backlight source for the display of the LED combined with the perovskite quantum dot glass ceramics, the luminous quantum efficiency of the perovskite quantum dot glass ceramics is high, the luminous quantum efficiency of the green perovskite quantum dot glass ceramics can reach 90%, the luminous quantum efficiency of the red perovskite quantum dot glass ceramics can reach 60%, and the luminous quantum efficiency of the blue perovskite quantum dot glass ceramics can reach 45%.
4. The wide color gamut backlight source for the display of the LED combined with the perovskite quantum dot glass ceramics, provided by the invention, has the advantages that the perovskite quantum dot glass ceramics are prepared by a high-temperature solid phase method, the quantum dot glass ceramics are precipitated and uniformly distributed in a glass matrix, the process is simple, and the manufacturing cost is low.
5. According to the wide color gamut backlight source for the display of the LED combined perovskite quantum dot glass-ceramic, provided by the invention, the perovskite quantum dot glass-ceramic is protected by glass, is not easily affected by moisture and air oxidation, has good environmental stability, and does not need to prepare a core-shell structure and perform high-cost moisture-proof and anti-oxidation treatment like the existing II-VI group quantum dot crystal powder of CdSe/ZnS and the like and III-V group core-shell structure quantum dot crystal powder of InP/ZnS and the like and films thereof. The perovskite quantum dot glass ceramics used as the backlight source has quite long service life, and can save higher moisture-proof and oxidation-proof packaging cost of the quantum dots.
6. The wide color gamut backlight source for display of the LED combined with the perovskite quantum dot glass ceramics provided by the invention has good mechanical stability, is obviously improved compared with the existing rare earth fluorescent powder, quantum dot crystal particles, quantum dot glass ceramics particles and films thereof, and does not have the problems of thermal degradation and the like caused by powder particle movement or the mixing of silica gel and the fluorescent powder or the quantum dot particles.
7. According to the wide color gamut backlight source for display of the LED combined with the perovskite quantum dot glass ceramics, the photoluminescence life of the perovskite quantum dot glass ceramics reaches the level of 100ns, the response speed of the perovskite quantum dot glass ceramics is equivalent to that of the LED, and the display tailing effect of some fluorescent powder with slow response speed does not exist. The final display speed depends on the response speed of the liquid crystal due to the ultra-fast response speed, and the liquid crystal display device is suitable for being applied to a field sequential working mode.
In conclusion, the technical scheme of the invention can solve the problems of low color gamut, low light efficiency, display tailing, performance aging, core-shell structure manufacturing, special moisture and oxidation resistance treatment, poor mechanical stability and thermal stability and high cost in the application of rare earth fluorescent powder, quantum dot crystal particles, quantum dot glass particles and films thereof, electroluminescent quantum dot light-emitting diodes and electroluminescent organic light-emitting diodes in display in the prior art. Due to the excellent performance of the perovskite quantum dot glass ceramics, the perovskite quantum dot glass ceramics are suitable for being applied to LED backlight sources for display, which have wide color gamut, high efficiency, low cost, good stability and quick response.
Based on the reasons, the invention can be widely popularized in the display application fields of color televisions, computers, electronic advertising boards, communication equipment, instruments, large-screen display and the like.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a spectrum of a backlight source of a blue light LED combined with green light quantum dot glass ceramics and red light quantum dot glass ceramics passing through a color filter, wherein (a) is a schematic diagram of a light emission spectrum of the blue light LED combined with the perovskite quantum dot glass ceramics, (b) is a schematic diagram of a transmission spectrum of the color filter, and (c) is a schematic diagram of red, green and blue light spectrums output by a display in a certain proportion.
Fig. 2 is a schematic diagram of three applications of the LED quantum dot glass-ceramic side-in backlight source of the present invention, wherein (a) is perovskite quantum dot glass-ceramic packaged on an LED chip, (b) is a partial enlarged view of an LED and quantum dots of (a), (c) is a partial enlarged view of a perovskite quantum dot glass-ceramic packaged on a side surface of a light guide plate, (d) is a partial enlarged view of quantum dots of (c), (e) is a perovskite quantum dot glass-ceramic packaged on a back surface of a light guide plate, and (f) is a partial enlarged view of quantum dots of (e).
FIG. 3 is a schematic diagram of an application of a direct type backlight source of LED quantum dot microcrystalline glass in the invention.
Fig. 4 is a schematic diagram of the application of the field sequential LED backlight source of the perovskite quantum dot glass ceramics in the invention, wherein (a) is a schematic diagram of red light, green light and blue light respectively generated by combining the blue light LED with the red perovskite quantum dot glass ceramics, the green perovskite quantum dot glass ceramics and the blue light LED, b) is a schematic diagram of red light, green light and blue light respectively generated by combining the LED with the red perovskite quantum dot glass ceramics, the green perovskite quantum dot glass ceramics and the blue perovskite quantum dot glass ceramics, and c) is a schematic diagram of a video field formed by sequentially flashing the red light, the green light and the blue light in the field sequential application.
Fig. 5 is a schematic diagram of an emission spectrum and an excitation spectrum of the green perovskite quantum dot glass ceramics in the invention, wherein (a) is a schematic diagram of an emission spectrum, and (b) is a schematic diagram of an excitation spectrum.
FIG. 6 is a schematic diagram of the temperature stability of the luminescence spectrum of the green perovskite quantum dot glass ceramics in the invention.
Fig. 7 is a schematic diagram of an emission spectrum and an excitation spectrum of the red perovskite quantum dot glass ceramics in the invention, wherein (a) is a schematic diagram of an emission spectrum, and (b) is a schematic diagram of an excitation spectrum.
FIG. 8 is a schematic diagram of color coordinates of a blue LED, an LED combined with green perovskite quantum dot glass ceramics and red perovskite quantum dot glass ceramics in the invention.
In the figure: 1. perovskite quantum dot glass ceramics; 2. a blue LED; 3. a light guide plate; 4. a reflector; 5. green-light perovskite quantum dot glass ceramics; 6. red-light perovskite quantum dot glass ceramics; 7. a diffusion membrane; 8. a brightness enhancement film; 9. a dual brightness enhancement film; 10. an LCD panel; 11. blue light perovskite quantum dot glass ceramics.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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.
FIG. 1 is a schematic diagram of a blue LED combined green perovskite quantum dot glass ceramic backlight source and a red perovskite quantum dot glass ceramic backlight source passing through a color filter spectrum according to the invention, wherein (a)The light emission spectrum of the combination of the blue LED and the perovskite quantum dot glass ceramics is shown in the figure, (b) the transmission spectrum of the color filter is shown in the figure, and (c) the red, green and blue light spectrums with certain proportions output by the display are shown in the figure. As shown in figure 1, the perovskite quantum dot glass ceramics 1 has narrow and symmetrical light-emitting spectrum and adjustable light-emitting wavelength, and can adjust red, green and blue three-color spectra of quantum dots to be near the maximum value of the transmission spectrum of a color filter, so that the optimal transmission effect is achieved, and the light utilization efficiency is greatly improved. Existing blue light LED combines Ce3+YAG yellow phosphor powder technology and LED combine other red, green phosphor powder technology have many spectral composition waste not in the light transmission range of the color filter, and also have the defect such as being bad in the color purity of the spectrum, response speed slow, and the blue light LED combines red light and green light perovskite quantum dot glass ceramic backlight technology to have obvious advantage.
Example 1
Fig. 2 is a schematic diagram of three applications of the LED quantum dot glass-ceramic side-in backlight source of the present invention, wherein (a) is a perovskite quantum dot glass-ceramic packaged LED chip, (b) is a partial enlarged view of the LED and quantum dot glass of (a), (c) is a perovskite quantum dot glass-ceramic packaged on the side of the light guide plate, (d) is a partial enlarged view of the quantum dot glass of (c), (e) is a perovskite quantum dot glass-ceramic packaged on the back surface of the light guide plate, and (f) is a partial enlarged view of the quantum dot glass of (e). The lateral backlight source comprises perovskite quantum dot microcrystalline glass 1, a blue light LED2, a light guide plate 3 and a reflector 4, and is required to generate three-color mixed light of red, green and blue, and then the proportion of red light, green light and blue light output is controlled by a liquid crystal light valve and a color filter together on each pixel.
As shown in fig. 2 (a), the perovskite quantum dot glass ceramics 1 is packaged on an LED chip, and the structure has high requirements on thermal stability, and needs reasonable thermal design. The perovskite quantum dot glass ceramics 1 in the embodiment comprises green perovskite quantum dot glass ceramics 5 and red perovskite quantum dot glass ceramics 6. As shown in fig. 2 (c), the perovskite quantum dot glass ceramics 1 is encapsulated at the side of the light guide plate 3, and the thermal stability requirement of the structure is reduced. As shown in fig. 2 (e), the perovskite quantum dot glass ceramics 1 is encapsulated on the back surface of the light guide plate 3, and in this structure, the perovskite quantum dot glass ceramics 1 is used in the largest amount and has the lowest requirement on thermal stability. In the above three structures, the red perovskite quantum dot glass ceramics 6 and the green perovskite quantum dot glass ceramics 5 may be arranged in a stacked manner or may be arranged in a single layer in a certain ratio, which are respectively shown in fig. 2 (b), (d) and (f). In the case of lamination arrangement, the preferred scheme is that the LED light source irradiates the red perovskite quantum dot glass ceramics 6 and the green perovskite quantum dot glass ceramics 5 in sequence. In the case of proportional single-layer arrangement, for fig. 2 (a), the perovskite quantum dot glass ceramics 1 can be packaged on different LED chips; for (c) and (e) in fig. 2, perovskite quantum dot glass ceramics 1 are arranged in a single layer at a certain ratio on the side and back surfaces of the light guide plate 3.
Example 2
FIG. 3 is a schematic diagram of an application of a direct type backlight source of LED quantum dot microcrystalline glass in the invention. As shown in fig. 3, the direct type backlight source includes a blue LED2, a reflector 4, a green perovskite quantum dot glass ceramic 5, a red perovskite quantum dot glass ceramic 6, a diffusion film 7, a brightness enhancement film 8, a dual brightness enhancement film 9, and an LCD panel 10 including a color filter, and is required to generate three-color mixed light of red, green, and blue, and then the ratio of the output red, green, and blue light is controlled by a liquid crystal light valve and a color filter together at each pixel.
As shown in fig. 3, the direct type backlight source is suitable for packaging perovskite quantum dot microcrystalline glass 1 on an LED chip, and in order to prevent performance reduction caused by temperature rise, a reasonable thermal design is required, and the LED chip can have a certain distance from green perovskite quantum dot microcrystalline glass 5 and red perovskite quantum dot microcrystalline glass 6. The direct type backlight source can independently control red light, green light and blue light, and further adopts a field sequential working mode.
Example 3
Fig. 4 is a schematic diagram of the application of the field sequential LED backlight source of the perovskite quantum dot glass ceramics in the invention, wherein (a) is a schematic diagram of red light, green light and blue light respectively generated by combining the blue light LED with the red perovskite quantum dot glass ceramics, the green perovskite quantum dot glass ceramics and the blue light LED, b) is a schematic diagram of red light, green light and blue light respectively generated by combining the LED with the red perovskite quantum dot glass ceramics, the green perovskite quantum dot glass ceramics and the blue perovskite quantum dot glass ceramics, and c) is a schematic diagram of a video field formed by sequentially flashing the red light, the green light and the blue light in the field sequential application. The field sequential LED backlight includes blue LED2, green perovskite quantum dot glass ceramic 5, red perovskite quantum dot glass ceramic 6, and blue perovskite quantum dot glass ceramic 11, where blue LED2 may also be LEDs shorter than the quantum dot absorption cutoff wavelength. As shown in fig. 4 (a), green light is generated by the blue LED2 and the green perovskite quantum dot glass ceramic 5, red light is generated by the blue LED2 and the red perovskite quantum dot glass ceramic 6, and blue light is directly generated by the blue LED 2. As shown in fig. 4 (b), in order to pursue blue light of high color purity, blue light may be generated from the short-wavelength LED and the blue perovskite quantum dot glass ceramics 11, and green and red light are also generated from the blue LED2 and the corresponding perovskite quantum dot glass ceramics. As shown in fig. 4 (c), in the case of field sequential application, red light, green light, and blue light are controlled in a time division multiplexing manner, and the red light, the green light, and the blue light are respectively flashed during the persistence time of human vision, so that the human brain can generate a color light effect. The field-sequential backlight source LED combines perovskite quantum dot glass ceramics to require that red light, green light and blue light with high color purity are independently generated through circuit control, the luminous flux of the red light, the green light and the blue light passing through each pixel is controlled through a liquid crystal light valve, so that a color filter of a backlight system can be omitted, the utilization efficiency of the light is greatly improved, the cost of the filter is saved, the production time is reduced, the reliability is improved, and the like. The perovskite quantum dot glass ceramics 1 of the embodiment has quick photoluminescence response time, about 100ns magnitude, is equivalent to the response time of an LED, can meet the millisecond-level response requirement required by field sequence application by matching with a liquid crystal material with high response speed, and is expected to realize an LED display light source with high performance and low cost. Because red light, green light and blue light are generated independently, the field sequence application is only suitable for encapsulating the perovskite quantum dot glass ceramics 1 on an LED chip, and certain thermal design is needed for preventing the performance from being influenced by temperature rise. In the field sequential application case, a side-in type LED backlight or a direct type LED backlight structure can be adopted.
Fig. 5 is a schematic diagram of an emission spectrum and an excitation spectrum of the green quantum dot glass ceramics according to the present invention, wherein (a) is a schematic diagram of an emission spectrum, and (b) is a schematic diagram of an excitation spectrum. As shown in fig. 5 (a), the perovskite quantum dot glass ceramics 1 has stable emission wavelength due to the exciton emission characteristics, and does not change with the change of the excitation wavelength. The luminescent spectrum is very narrow (the full width at half maximum is 26nm), and is very symmetrical, the luminescent peak wavelength is 515nm, and the peak wavelength can be adjusted within the range of 500nm-530nm by adjusting the size of the quantum dots. The luminous quantum efficiency under 365nm light excitation is 86.8%, and the average life of the luminescence is 170 ns. As shown in fig. 5 (b), quantum dot glass ceramics can be excited to emit light by a large number of wavelengths shorter than the absorption cutoff wavelength.
FIG. 6 is a schematic diagram of the temperature stability of the luminescence spectrum of the green perovskite quantum dot glass ceramics in the invention. As shown in FIG. 6, the spectrum of the light emitted at different temperatures under excitation of blue light with a wavelength of 465nm is shown, and as shown in FIG. 6, the intensity of the light emitted gradually decreases with the temperature ranging from 27 ℃ to 125 ℃, but the peak wavelength is stable, the spectrum pattern is not changed, and the symmetry is maintained. The change of the luminous intensity along with the temperature requires that the perovskite quantum dot glass ceramics 1 needs temperature control management in application so as to ensure the stability of the color prepared by red, green and blue.
Fig. 7 is a schematic diagram of an emission spectrum and an excitation spectrum of the red perovskite quantum dot glass ceramics in the invention, wherein (a) is a schematic diagram of an emission spectrum, and (b) is a schematic diagram of an excitation spectrum. As shown in fig. 7 (a), the perovskite quantum dot glass ceramics 1 has stable spectral patterns because the emission wavelength does not change with the change of the excitation wavelength due to the exciton emission characteristics. The luminescent spectrum is very narrow (the full width at half maximum is 39nm), the luminescent peak wavelength is 675nm, and the peak wavelength can be adjusted within the range of 660nm-700nm by adjusting the size of the quantum dot. The luminous quantum efficiency measured under the excitation of 405nm light is 56%.
FIG. 8 is a schematic diagram of color coordinates of a blue LED, the blue LED combined with green perovskite quantum dot glass ceramics and red perovskite quantum dot glass ceramics in the invention. As shown in fig. 8, point a represents the color coordinates of blue light of blue LED2 itself, point B represents the color coordinates of narrow line width green light produced by blue LED2 in combination with green perovskite quantum dot glass ceramic 5, and point C represents the color coordinates of narrow line width red light produced by blue LED2 in combination with red perovskite quantum dot glass ceramic 6. As can be taken from fig. 8, a very wide color gamut can be achieved, up to 130% of the NTSC color gamut standard.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. The wide color gamut backlight source for the display of the LED combined perovskite quantum dot glass ceramic is used for providing a light source for a display and is characterized in that the backlight source comprises an LED and perovskite quantum dot glass ceramic, and the perovskite quantum dot glass ceramic comprises red perovskite quantum dot glass ceramic, green perovskite quantum dot glass ceramic and blue perovskite quantum dot glass ceramic;
quantum dots in the perovskite quantum dot glass ceramic material are core materials for generating three primary color spectrums of red, green and blue with narrow line widths for display, and the quantum dots comprise CsPbX3(X ═ Cl, Br, I), or CsPb (Cl)xBr1-x)3X is 0-1, or CsPb (Br)xI1-x)3，x＝0-1；
The wide color gamut backlight source spectrum for display contains the self blue light component of the blue light LED, and the blue light LED excites CsPbBr3Or CsPb (Br)xI1-x)3Narrow line width green light component generated by quantum dot microcrystalline glass, and CsPbI excited by blue light LED3Or CsPb (Br)xI1-x)3Narrow line width red light generated by quantum dot glass ceramicsDividing; or the backlight spectrum contains short-wavelength LED excited blue light CsPb (Cl) lower than the absorption cut-off wavelength of the quantum dotsxBr1-x)3Narrow-linewidth blue light component generated by quantum dot microcrystalline glass, and CsPbBr excited by blue light LED3Or CsPb (Br)xI1-x)3Narrow line width green light component generated by quantum dot microcrystalline glass, and CsPbI excited by blue light LED3Or CsPb (Br)xI1-x)3Narrow line width red light component generated by quantum dot glass ceramics;
wherein, the half-height width of the luminescent spectrum of the quantum dot glass ceramics is 20nm-40nm, and the luminescent quantum efficiency reaches 45-90%; the perovskite quantum dot glass ceramics are prepared by a high-temperature melting method;
the luminous quantum efficiency of the green perovskite quantum dot glass ceramics can reach 90%; the luminous quantum efficiency of the red perovskite quantum dot glass ceramics can reach 60 percent; the luminous quantum efficiency of the blue perovskite quantum dot glass ceramics can reach 45%.
2. The wide color gamut backlight source for display of LED-integrated perovskite quantum dot glass ceramics according to claim 1, wherein the glass matrix material of the perovskite quantum dot glass ceramics is borate, or borosilicate, or borophosphate, or aluminate, or aluminosilicate, or aluminoborosilicate, or silicate, or phosphate, or phosphosilicate, or tellurate, or germanate, or borogermanate, or titanate, or antimonate, or arsenate.
3. The LED perovskite quantum dot glass ceramic combined wide color gamut backlight source for display as claimed in claim 1, wherein the LED perovskite quantum dot glass ceramic combined side-in type backlight source or the LED perovskite quantum dot glass ceramic combined direct type backlight source is adopted.
4. The wide color gamut backlight source for display of LED combined with perovskite quantum dot glass ceramic as claimed in claim 3, wherein when the wide color gamut backlight source for display is an LED combined perovskite quantum dot glass ceramic side-in type backlight source, the perovskite quantum dot glass ceramic is packaged on an LED chip, or on the side surface of a light guide plate, or on the back surface of the light guide plate in a backlight source system.
5. The wide color gamut backlight source for display of LED combined with perovskite quantum dot glass ceramics as claimed in claim 3, wherein when the wide color gamut backlight source for display is a direct type backlight source of LED combined with perovskite quantum dot glass ceramics, the perovskite quantum dot glass ceramics are packaged on an LED chip in a manner of packaging in a backlight source system.
6. The wide color gamut backlight source for display of LED combined with perovskite quantum dot glass ceramics according to claim 4, wherein the perovskite quantum dot glass ceramics are arranged in a laminated layer or in a single layer according to a certain proportion in the backlight source system.
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Application publication date: 20191203 Assignee: Riyu optical technology (Suzhou) Co.,Ltd. Assignor: Dalian Maritime University Contract record no.: X2024210000016 Denomination of invention: A Wide Color Gamma Backlight Source for Display of LED Combined with Perovskite Quantum Dot Microcrystalline Glass Granted publication date: 20210115 License type: Common License Record date: 20240308 |