Nitride red phosphor for white light LED and preparation method thereof

A technology of red phosphor and red fluorescence, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of reducing white light luminous efficiency, low luminous intensity, harmful to human body, etc. The effect of shortening the reaction sintering time

Inactive Publication Date: 2019-12-03
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, red phosphor materials commonly used in this method such as Y2O3:Eu3+ and Y2O2S:Eu3+ has a lower luminous intensity, which will greatly reduce the luminous efficiency of white light
And the stability of Y2O2S:Eu3+ is low, and harmful gases will be produced during the preparation and use

Method used

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  • Nitride red phosphor for white light LED and preparation method thereof
  • Nitride red phosphor for white light LED and preparation method thereof
  • Nitride red phosphor for white light LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: prepare Al 0.994 N:Mn 0.005 ,Nd 0.001

[0026] (1) Set the target product Al 0.994 N:Mn 0.005 ,Nd 0.001 The quality is 2.5g, according to the ratio of the amount of substance of Al:Mn:Nd being 0.994:0.005:0.001, take raw material AlN (99.9%), MnCO 3 (99.9%) and Nd 2 o 3 (99.99%), put into an agate mortar and grind and mix uniformly to obtain a precursor mixture;

[0027] (2) Put the precursor mixture obtained in step (1) into a high-purity boron nitride crucible, then place it in a gas pressure sintering furnace with graphite as a heating element, and sinter in a nitrogen atmosphere at a pressure of 1.0 MPa and a temperature of 1900°C, keep warm for 2 hours, the heating rate is 500°C / h, and the synthesized phosphor is water-cooled with the furnace body;

[0028] (3) Take out the fluorescent powder synthesized in step (2), put it into a beaker filled with deionized water, add concentrated hydrochloric acid with a mass fraction of 36%-38%, wherein t...

Embodiment 2

[0029] Embodiment 2: prepare Al 0.989 N:Mn 0.01 ,Nd 0.001

[0030] (1) Set the target product Al 0.989 N:Mn 0.01 ,Nd 0.001 The quality is 2.5g, according to the ratio of the amount of substance of Al:Mn:Nd being 0.989:0.01:0.001, take raw material AlN (99.9%), MnCO 3 (99.9%) and Nd 2 o 3 (99.99%), put into an agate mortar and grind and mix uniformly to obtain a precursor mixture;

[0031] (2) Put the precursor mixture obtained in step (1) into a high-purity boron nitride crucible, then place it in a gas pressure sintering furnace with graphite as a heating element, and sinter in a nitrogen atmosphere at a pressure of 1.0 MPa and a temperature of 1900°C, keep warm for 2 hours, the heating rate is 500°C / h, and the synthesized phosphor is water-cooled with the furnace body;

[0032](3) Take out the fluorescent powder synthesized in step (2), put it into a beaker filled with deionized water, add concentrated hydrochloric acid with a mass fraction of 36%-38%, wherein the v...

Embodiment 3

[0033] Embodiment 3: prepare Al 0.984 N:Mn 0.015 ,Nd 0.001

[0034] (1) Set the target product Al 0.984 N:Mn 0.015 ,Nd 0.001 The quality is 2.5g, according to the ratio of the amount of substance of Al:Mn:Nd being 0.984:0.015:0.001, take raw material AlN (99.9%), MnCO 3 (99.9%) and Nd 2 o 3 (99.99%), put into an agate mortar and grind and mix uniformly to obtain a precursor mixture;

[0035] (2) Put the precursor mixture obtained in step (1) into a high-purity boron nitride crucible, then place it in a gas pressure sintering furnace with graphite as a heating element, and sinter in a nitrogen atmosphere at a pressure of 1.0 MPa and a temperature of 1900°C, keep warm for 2 hours, the heating rate is 500°C / h, and the synthesized phosphor is water-cooled with the furnace body;

[0036] (3) Take out the fluorescent powder synthesized in step (2), put it into a beaker filled with deionized water, add concentrated hydrochloric acid with a mass fraction of 36%-38%, wherein t...

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Abstract

The invention discloses a nitride red phosphor for a white light LED and a preparation method thereof. A chemical general formula of the phosphor is Al<(1-X-Y)>N:Mn<x>,M<y>, wherein the matrix is AlN,the Mn ion is a luminescence center, M is one of Nd, Dy, Tb and Pr, 0.005<=x<=0.02, and 0<y<=0.001. The phosphor is prepared by a gas pressure sintering method. A sample of the prepared phosphor emits a red light of about 600 nm under excitation of ultraviolet light, luminous intensity is high, and thermal stability is excellent. Preparation of the red phosphor is simple, and the production costis low.

Description

technical field [0001] The invention belongs to the field of inorganic luminescent materials, and relates to a red fluorescent powder, in particular to a nitride red fluorescent powder for white LEDs and a preparation method thereof. Background technique [0002] Phosphor powder is widely used in fields such as flat panel displays, field emission displays, cathode ray tubes, and light emitting diodes (Light Emitting Diode, referred to as LEDs). Among them, LEDs have attracted extensive attention due to their advantages of high efficiency, energy saving, green environmental protection, simple structure, and strong designability, and are known as the green lighting source of the 21st century. So far, there are two mainstream schemes for using LEDs to obtain white light: one is to coat the surface of blue LEDs with yellow phosphor (Y 3 Al 5 o 12 : Ce 3 + ) way; the other is to combine ultraviolet LEDs chips with red, green and blue three primary color phosphors to obtain w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
CPCC09K11/77C09K11/7743C09K11/7756
Inventor 王晓君李东振谷池
Owner XUZHOU NORMAL UNIVERSITY
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