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A glass-ceramic with high-efficiency white light emission and its preparation method

A technology of glass ceramics and white light, applied in the field of solid luminescent materials, can solve the problems of unsatisfactory high-performance devices, insufficient red light emission intensity, low color rendering index, etc., to avoid easy aging, stable physical and chemical properties, and simple preparation process Effect

Active Publication Date: 2018-06-05
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of phosphor has high luminous efficiency, but due to insufficient red light emission intensity, the color rendering index is low, and the color temperature is high, and white light is easy to drift, which cannot meet the needs of high-performance devices.

Method used

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  • A glass-ceramic with high-efficiency white light emission and its preparation method
  • A glass-ceramic with high-efficiency white light emission and its preparation method
  • A glass-ceramic with high-efficiency white light emission and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Accurately weigh the raw materials according to the proportion.

[0033] According to SiO 2 :91%, Al 2 o 3 :3%, SrO:6%, Dy 3+ A total of 11 g of raw materials were weighed with a doping amount of 2%. The glass composition and raw material quality are shown in Table 1.

[0034] (2) First, the solution containing TEOS, ethanol, and deionized water was continuously stirred at room temperature for 1 hour, and the molar ratio of TEOS:ethanol:H 2 O=1:1:3. Second, the Sr(NO 3 ) 2 Soluble in deionized water.

[0035] (3) Al 2 o 3 、Dy 2 o 3 dilute HNO 3 Dissolve, heat and stir to remove excess nitric acid in the solution, in which dilute HNO 3 According to volume ratio water:HNO 3 =3:1 preparation.

[0036] (4) Mix the solutions of step (2) and step (3) to control the molar ratio H in the final solution 2 O:TEOS=15:1, and the resulting mixture was continuously stirred for 2 hours. Then the solution was added to a plastic petri dish and left to stand at room...

Embodiment 2

[0041] (1) Accurately weigh the raw materials according to the proportion.

[0042] According to SiO 2 :82%, Al 2 o 3 :6%, SrO:12%, Dy 3+ Raw materials were weighed at a ratio of 2% doping. The quality of each raw material is shown in Table 2.

[0043] (2) First, the solution containing TEOS, ethanol, and deionized water was continuously stirred at room temperature for 1 hour, and the molar ratio of TEOS:ethanol:H 2O=1:1:5. Second, the Sr(NO 3 ) 2 Soluble in deionized water.

[0044] (3) Al 2 o 3 、Dy 2 o 3 dilute HNO 3 Dissolve, heat and stir to remove excess nitric acid in the solution, in which dilute HNO 3 According to volume ratio water:HNO 3 =3:1 preparation.

[0045] (4) Mix the solutions of step (2) and step (3) to control the molar ratio H in the final solution 2 O:TEOS=15:1, and the resulting mixture was continuously stirred for 2 hours. Then the solution was added to a plastic petri dish and left to stand at room temperature for 30 days to obtain a ...

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Abstract

The invention discloses glass ceramic with efficient white light emission and a preparation method thereof. With rare-earth ions Dy<3+> as a light-emitting core, the rare-earth ions Dy<3+> are uni-doped into the glass ceramic containing Sr2SiO4 nanocrystal to emit warm white light under near ultraviolet excitation. A simple sol-gel method which is simple to operate is prepared. The method mainly comprises the following steps of: (a) selecting raw materials; (b) dissolving, mixing, stirring and standing the raw materials; and (c) sintering the glass ceramic. The transparent glass ceramic emits the white light when uni-doped with the Dy<3+> under near ultraviolet excitation. The glass ceramic can be used for building a near ultraviolet-excited novel white LED device as a fluorescent material.

Description

technical field [0001] The design of the invention belongs to the field of solid luminescent materials, and in particular relates to a transparent glass ceramic capable of realizing high-efficiency white light emission under near-ultraviolet excitation and a preparation method thereof. Background technique [0002] LED is a solid-state light source with high efficiency, stable performance and low cost. It can be widely used in various lighting equipment and has a bright future. White LEDs are expected to become the fourth generation of new lighting sources, realizing energy-saving and environmentally friendly green lighting. There are many ways to realize white LED. At present, most commercialized white LED lighting devices use blue-light InGaN LED chips combined with phosphors that can emit yellow, green, and orange light. This type of phosphor has high luminous efficiency, but due to insufficient red light emission intensity, the color rendering index is low, and the colo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/04C03C4/12
CPCC03C4/12C03C10/0018
Inventor 于立新孙家驹李宋楚满孝琴
Owner NANCHANG UNIV
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