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A red light-emitting glass-ceramic for wide color gamut backlight display and its preparation technology

A technology of glass ceramics and glass, applied in the field of red light-emitting glass ceramics and its preparation, can solve problems such as yellowing, white LED light decay and color drift, and reduce device service life

Active Publication Date: 2019-09-20
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional organic silica gel is prone to aging and yellowing under the long-term irradiation of high-power blue light chips, resulting in light decay and color drift of white LEDs, thus greatly reducing the service life of the device

Method used

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  • A red light-emitting glass-ceramic for wide color gamut backlight display and its preparation technology
  • A red light-emitting glass-ceramic for wide color gamut backlight display and its preparation technology
  • A red light-emitting glass-ceramic for wide color gamut backlight display and its preparation technology

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0038] Example 1: Analyzing pure SiO 2 、Al 2 o 3 , NbF 5 , KF, K 2 CO 3 、K 2 MnF 7 Powder, according to 40SiO 2 : 30Al 2 o 3 : 9NbF 5 : 10B 2 o 3 :5KF :5K 2 CO 3 : 1K 2 MnF 6 The proportion (molar ratio) is accurately weighed and placed in an agate ball mill jar, mixed and ground evenly, placed in a platinum crucible, placed in a resistance furnace, heated to 1450°C and kept for 1 hour to melt, and then, the glass The melt is taken out and quickly poured into a mold to form a block precursor glass. Finally, the obtained precursor glass is placed in a resistance furnace for annealing at 550°C to eliminate internal stress; the obtained precursor glass is placed in a resistance furnace again for heating After reaching 750°C, keep it warm for 6 hours to partially crystallize it to obtain bulk transparent glass ceramics.

[0039] X-ray diffraction data indicated that K was precipitated in the glass matrix 2 NbF 7 Microcrystalline phase (such as figure 1 shown). ...

example 2

[0040] Example 2: Analyzing pure SiO 2 、Al 2 o 3 , TaF 5 , KF, K 2 CO 3 、K 2 MnF 6 Powder, according to 35SiO 2 : 35Al 2 o 3 : 9.5TaF 5 :10KF: 10K 2 CO 3 : 0.5K 2 MnF 6 The proportion (molar ratio) is accurately weighed and placed in an agate ball mill jar, mixed and ground evenly, placed in a platinum crucible, placed in a resistance furnace, heated to 1400°C and kept for 2 hours to melt, and then the glass The melt is taken out and quickly poured into a mold to form a block precursor glass. Finally, the obtained precursor glass is placed in a resistance furnace for annealing at 600°C to eliminate internal stress; the obtained precursor glass is placed in a resistance furnace again for heating After reaching 700°C, keep it warm for 1 hour to partially crystallize it, and obtain block-shaped transparent glass ceramics. After testing, K was precipitated in the glass matrix 2 TaF 7 Microcrystalline, the fluorescence quantum efficiency of the sample is 93%. β-si...

example 3

[0041] Example 3: Analyzing pure SiO 2 、Al 2 o 3 , NbF 5 , KF, K 2 MnF 6 Powder, according to 60SiO 2 : 20Al 2 o 3 : 3.5NbF 5 : 15KF : 1.5K 2 MnF 6 (Molar ratio) is accurately weighed and placed in an agate ball mill jar, mixed and ground evenly, placed in a platinum crucible, placed in a resistance furnace, heated to 1000°C, and kept for 5 hours to melt, then, the glass The melt is taken out and quickly poured into a mold to form a block precursor glass. Finally, the obtained precursor glass is placed in a resistance furnace for annealing at 450°C to eliminate internal stress; the obtained precursor glass is placed in a resistance furnace again for heating After reaching 800°C, keep it warm for 8 hours to make it partly crystallized, and obtain bulk transparent glass ceramics. After testing, K was precipitated in the glass matrix 2 NbF 7 Microcrystalline, the fluorescence quantum efficiency of the sample is 85%. β-sialon:Eu 2+ The green powder is spin-coated on...

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Abstract

The invention provides a glass ceramic capable of realizing blue light excitation and high-efficiency and narrow-band red light emission and containing a microcrystalline phase K2XF7:Mn<4+> (X is equal to Nb or Ta). The transparent microcrystallite glass ceramic is characterized in that a large amount of K2XF7:Mn<4+> (X is equal to Nb or Ta) fluorescent microcrystalline is uniformly inlaid in an oxide glass matrix. The glass ceramic provided by the invention is prepared from the following glass components in percentage by mol: 20 to 60 mol percent of SiO2, 20 to 45 mol percent of Al2O3, 0 to 15 mol percent of NbF5, 0 to 15 mol percent of TaF5, 5 to 15 mol percent of KF, 0 to 20 mol percent of K2CO3 and 0.1 to 2.0 mol percent of K2MnF6, wherein the total mol amount of the components is 100 mol percent. The invention also provides a preparation technology of the transparent glass ceramic. The glass ceramic disclosed by the invention is excited by blue light to emit red light, and the quantum efficiency of the glass ceramic is as high as 95 percent; beta-sialon:Eu<2+> green powder is spun on the surface of the red light emission transparent glass ceramic and is coupled with a blue light chip; by optical filtering of standard commercial red, green and blue optical filters, a maximum color gamut of the glass ceramic in a CIE1931 chrominance space is as high as 90 percent NTSC.

Description

technical field [0001] The invention relates to the field of solid luminescent materials, in particular to a red light emitting glass ceramic used for wide color gamut backlight display and its preparation technology. Background technique [0002] In the liquid crystal display (LCD) field, high brightness, small size, low energy consumption, and mercury-free are the general trend, which also promotes the replacement of backlight sources—phosphor-converted white LEDs gradually replace traditional cold-cathode fluorescent lamps. [0003] The current LCD technology has strict requirements on image quality and color saturation, and its color gamut should be wide enough to reflect the rich colors in nature. The width of the color gamut depends on the spectrum of the backlight and the corresponding red, green and blue color filters (the spectral shape of the backlight should be as narrow as possible, and its wavelength must match the maximum transmission area of ​​the filter). Du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/062C03C3/064C03C3/112C03C3/118C03C4/12C03C10/16C03B19/02G02F1/13357
CPCC01P2002/72C03B19/02C03C3/062C03C3/064C03C3/112C03C3/118C03C4/12C03C10/16G02F1/133621G02F1/133614
Inventor 林航胡桃王元生
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI