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Red-light-emitting glass ceramic and preparation method thereof, and LED/LD light emitting device

A technology of glass ceramics and light-emitting devices, which is applied in the direction of optical elements, lighting devices, and components of lighting devices used to change the spectral characteristics of emitted light, to achieve excellent performance, excellent device performance, and excellent thermal stability of light emission.

Active Publication Date: 2021-01-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the invention and preparation of all-inorganic red light-emitting glass ceramics with high luminous quantum efficiency and good luminous thermo-optical and thermal stability is of great significance. Related research is expected to promote the rapid development of high-power white light sources. High-quality red-emitting glass-ceramics / ceramics for applications

Method used

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  • Red-light-emitting glass ceramic and preparation method thereof, and LED/LD light emitting device
  • Red-light-emitting glass ceramic and preparation method thereof, and LED/LD light emitting device
  • Red-light-emitting glass ceramic and preparation method thereof, and LED/LD light emitting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Analytically pure SiO 2 , Al 2 O 3 , MgO and Eu 2 O 3 Powder, according to 40SiO 2 : 35Al 2 O 3 : 24MgO: 1Eu 2 O 3 (molar ratio) is accurately weighed and placed in an agate ball mill, mixed and ground evenly, placed in an alumina crucible, placed in a tube furnace with nitrogen-hydrogen mixed gas, heated to 1450 ° C and kept warm It was melted for 1 hour. The melt is cooled with the furnace to obtain the precursor glass. Still in a mixed atmosphere of nitrogen and hydrogen, the bulk glass was heated to 1100° C. and kept for 20 minutes to crystallize it to obtain a red light-emitting glass-ceramic sample.

[0049] X-ray diffraction data showed that the prepared Mg 2 Al 4 Si 5 O 18 :Eu 2+ Micron-ceramics (such as figure 1 shown). figure 2 For the excitation and emission spectra of the sample at room temperature, the glass ceramic can emit light in the wavelength range of 500-850 nm under the excitation of near-ultraviolet light and blue light, and the e...

Embodiment 2

[0051] Analytically pure SiO 2 , Al 2 O 3 , MgO, CaO and Eu 2 O 3 Powder, according to 40SiO 2 : 30Al 2 O 3 : 20MgO: 9CaO: 1Eu 2 O 3 (molar ratio) is accurately weighed and placed in an agate ball mill, mixed and ground evenly, placed in an alumina crucible, placed in a tube furnace with a nitrogen-hydrogen mixture, heated to 1700 ° C and kept warm It was melted for 8 hours. The melt is cooled with the furnace to obtain the precursor glass. Still in the mixed atmosphere of nitrogen and hydrogen, the lower block glass was heated to 700° C. and kept for 12 hours to crystallize it to obtain a red light emitting glass ceramic sample.

[0052] After testing, Mg was prepared 1.5 Ca 0.5 Al 4 Si 5 O 18 :Eu 2+ Nanocrystalline glass ceramics, the luminous internal / external quantum efficiency is 90% / 70% respectively. The device performance was tested by coupling the red-emitting sample to a blue-light laser, and the maximum luminous flux and lumen efficiency were ~250 lu...

Embodiment 3

[0054] Analytically pure SiO 2 , Al 2 O 3 , MgO, BaO and Eu 2 O 3 Powder, according to 40SiO 2 : 30Al 2 O 3 : 20MgO: 9BaO: 1Eu 2 O 3 (molar ratio) is accurately weighed and placed in an agate ball mill, mixed and ground evenly, placed in an alumina crucible, placed in a tube furnace with a nitrogen-hydrogen mixture, heated to 1700 ° C and kept warm 30 minutes to melt. The melt is cooled with the furnace to obtain the precursor glass. Still in the mixed atmosphere of nitrogen and hydrogen, the lower block glass was heated to 1000° C. and kept for 4 hours to make it crystallized to obtain a red light emitting glass ceramic sample.

[0055] After testing, Mg was prepared 1.5 Ba 0.5 Al 4 Si 5 O 18 :Eu 2+ Microcrystalline glass ceramics, the luminous internal / external quantum efficiency is 96% / 75% respectively. The device performance was tested by coupling the red-emitting sample to a blue-light laser, and the maximum luminous flux and lumen efficiency were ~260 lu...

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Abstract

The invention provides red-light-emitting glass ceramic and a preparation method thereof, and an LED / LD light-emitting device. A2Al4Si5O18: Eu<2+> cordierite capable of realizing blue-light-excited red light emission is a crystalline phase material, wherein A is at least one selected from the group consisting of Mg, Ca, Sr, Ba and Zn and at least contains Mg. The invention especially relates to red-light-emitting glass ceramic containing cordierite with the chemical formula Mg2Al4Si5O18: Eu<2+> as a crystalline phase. The invention also provides a preparation method of the transparent glass ceramic. The glass ceramic containing Mg2Al4Si5O18: Eu<2+> as the crystalline phase emits red light under the excitation of blue light, and internal / external quantum efficiency is up to 94.5% / 70.6% respectively. The luminous flux and lumen efficiency of the red light device coupling the glass ceramic with a blue light laser are ~274 lm and ~54 lm / W respectively. The glass ceramic provided by the invention can be applied to the conversion type LED / LD light-emitting device.

Description

technical field [0001] The invention relates to the field of solid light-emitting materials, in particular to red light-emitting glass ceramics, a preparation method thereof, and an LED / LD light-emitting device. Background technique [0002] White LEDs converted by fluorescent materials have many advantages such as energy saving, environmental protection, and long service life. They are considered to be the fourth generation of white light sources and are used in lighting and display fields. However, with the increase of the input current density, the LED chip faces the problem of "efficiency dip" that is not related to heat, which is not conducive to its application in high-brightness, high-power white light illumination and display. [0003] The laser diode (LD) has no "efficiency dip" phenomenon under the input of high current density. It can output a high lumen density beam with a small beam spread angle. Program. The realization method of laser white light adopts the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/08C03C4/12F21V9/30F21Y115/10F21Y115/30
CPCC03C10/0045C03C4/12F21V9/30F21Y2115/10F21Y2115/30C09K11/77344C03C10/0036C03C3/095C03B5/16C03B32/02H01L33/502H01S5/02218C03B1/00C03C2204/00H01L2933/0041
Inventor 夏志国胡桃张勤远
Owner SOUTH CHINA UNIV OF TECH
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