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Red phosphor powder with high luminous efficiency and preparation method thereof

A technology of red phosphor and luminous efficiency, applied in the field of fluorescent materials, can solve the problems of difficulty in meeting the application requirements of high-performance devices, low conversion efficiency and low brightness, and achieve the effect of excellent intensity and high luminous efficiency.

Inactive Publication Date: 2019-05-03
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] More recent research is to use a single chip of purple light and red, blue, and green three primary color phosphors to package white LEDs, which can obtain high-quality white light, but the traditional red phosphors have problems of low conversion efficiency and brightness. It is difficult to meet the application requirements of high-performance devices

Method used

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  • Red phosphor powder with high luminous efficiency and preparation method thereof
  • Red phosphor powder with high luminous efficiency and preparation method thereof
  • Red phosphor powder with high luminous efficiency and preparation method thereof

Examples

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Embodiment 1

[0032] A red fluorescent powder with high luminous efficiency, the general chemical formula is A x B y C z D. 6 ,in

[0033] A is Li, B is Ca, C is Eu, D is O,

[0034] x satisfies the following conditions: x=1,

[0035] y meets the following conditions: y=0.8,

[0036] Z satisfies the following condition: z=2.4.

[0037] The preparation method of the red fluorescent powder with high luminous efficiency described in this embodiment comprises the following steps:

[0038] 1) Take the following raw materials according to the molar ratio in the general chemical formula: lithium carbonate, calcium carbonate and europium oxide;

[0039] 2) Lithium carbonate, calcium carbonate and europium oxide were mixed, put into a tube furnace and calcined at a temperature of 620°C for 42 minutes, then quickly taken out and cooled naturally at room temperature to obtain a mixture;

[0040] 3) Pulverize the naturally cooled mixture, pass through a 150-mesh sieve, and stir and mix evenly t...

Embodiment 2

[0047] A red fluorescent powder with high luminous efficiency, the general chemical formula is A x B y C z D. 6 ,in

[0048] A is Li, B is Ca, C is Eu, D is O,

[0049] x satisfies the following conditions: x=1.6,

[0050] y meets the following conditions: y=2.8,

[0051] Z satisfies the following condition: z=4.2.

[0052] The preparation method of the red fluorescent powder with high luminous efficiency described in this embodiment comprises the following steps:

[0053] 1) Take the following raw materials according to the molar ratio in the general chemical formula: lithium carbonate, calcium carbonate and europium oxide;

[0054] 2) Lithium carbonate, calcium carbonate and europium oxide were mixed, put into a tube furnace and calcined at a temperature of 680° C. for 48 minutes, then quickly taken out and cooled naturally at room temperature to obtain a mixture;

[0055] 3) Pulverize the naturally cooled mixture, pass through a 150-mesh sieve, and stir and mix even...

Embodiment 3

[0062] A red fluorescent powder with high luminous efficiency, the general chemical formula is A x B y C z D. 6 ,in

[0063] A is Li, B is Ca, C is Eu, D is O,

[0064] x satisfies the following conditions: x=1.8,

[0065] y satisfies the following condition: y=2.4

[0066] Z satisfies the following condition: z=4.

[0067] The preparation method of the red fluorescent powder with high luminous efficiency described in this embodiment comprises the following steps:

[0068] 1) Take the following raw materials according to the molar ratio in the general chemical formula: lithium carbonate, calcium carbonate and europium oxide;

[0069] 2) Lithium carbonate, calcium carbonate and europium oxide were mixed, put into a tube furnace and calcined at a temperature of 720°C for 50 minutes, then quickly taken out and cooled naturally at room temperature to obtain a mixture;

[0070] 3) Pulverize the naturally cooled mixture, pass through a 150-mesh sieve, and stir and mix evenly t...

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Abstract

The invention discloses a red phosphor powder with high luminous efficiency, which relates to the field of fluorescent materials and mainly solves the problem of low luminous efficiency of the existing red phosphor powder. The chemical formula of red phosphor is AxByCzD6, wherein A is Li, B is Ca, C is Eu, D is O, x satisfies the following conditions: 1<=x<=2.6, y satisfies the following conditions: 0.8<=y<=4, Z satisfies the following conditions: 2.4<=z<=5. The red phosphor powder of the invention appears that in the aspects of thermal stability, particle size and chromaticity, the red phosphor powder can generate excellent red light with good purity under the excitation of about 460 nm blue light, the red phosphor powder has high luminous efficiency and excellent performance in intensity, meets the application requirements of high-performance devices, and is worth popularizing and using.

Description

technical field [0001] The invention relates to the field of fluorescent materials, in particular to a red fluorescent powder with high luminous efficiency and a preparation method thereof. Background technique [0002] In recent years, white light LEDs have been hailed as the fourth-generation solid-state lighting devices by industry insiders because of their small size, long life, low energy consumption, good safety and stability, and no pollution to the environment. They have attracted much attention and developed rapidly. and widely used. White light is a mixture of multiple colors. [0003] At the beginning of the 19th century, people developed fluorescent lamps and phosphors in the process of studying the phenomenon of discharge luminescence. Fluorescent lamps at that time used zinc beryllium silicate phosphors, which had low luminous efficiency and were toxic. In 1942, A.H. McGeeger invented calcium halophosphate phosphor and used it in fluorescent lamps, which cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
Inventor 郑昌冉刘全生
Owner CHANGCHUN UNIV OF SCI & TECH