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Layered perovskite red phosphor for white LED and preparation method thereof

A technology of red phosphor and perovskite, which is applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve the problems of poor chemical stability and low luminous intensity of red phosphor, and achieve good stability and color purity Good color rendering and economical raw materials

Inactive Publication Date: 2015-10-21
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a novel layered perovskite red phosphor for white LED and its preparation method in view of the problems of low luminous intensity and poor chemical stability of the existing red phosphor for white LED

Method used

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  • Layered perovskite red phosphor for white LED and preparation method thereof
  • Layered perovskite red phosphor for white LED and preparation method thereof
  • Layered perovskite red phosphor for white LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 # ((Ca 0.995 Eu 0.005 Li 0.005 ) 4 Ti 3 o 10 ):

[0028] Composition as in Table 1 1 # Shown, specific preparation method comprises the following steps:

[0029]① Weighing, ball milling and mixing: Weigh the solid powder raw material according to the composition in Table 1, place it in a high-purity alumina ball milling tank, and add absolute ethanol as the ball milling medium at the same time, the total mass ratio of absolute ethanol to raw material powder is 2:1, the mass ratio of raw material powder: ball = 1:3, put the ball mill jar on the ball mill, set the ball mill speed to 200r / min, and mill for 10h.

[0030] ②Drying: Take out the ball-milled slurry, put it in a drying oven at 80°C, and dry it for 8 hours.

[0031] ③Calcination: The dried and sieved mixture is calcined at high temperature, kept at 1300°C for 6 hours, and then cooled to room temperature with the furnace to obtain layered perovskite red phosphor.

[0032] ④ Grind the obtained p...

Embodiment 2

[0035] Example 2 # ((Sr 0.95 PR 0.05 Na 0.05 ) 4 Ti 3 o 10 ):

[0036] Composition as in Table 1 2 # Shown, specific preparation method comprises the following steps:

[0037] ① Weighing, ball milling and mixing: Weigh the solid powder raw material according to the composition in Table 1, place it in a high-purity alumina ball milling tank, and add absolute ethanol as the ball milling medium at the same time, the total mass ratio of absolute ethanol to raw material powder is 3:1, the mass ratio of raw material powder: ball = 1:2, put the ball mill jar on the ball mill, set the ball mill speed to 300r / min, and mill for 6h.

[0038] ②Drying: Take out the ball-milled slurry, put it in a drying oven at 60°C, and dry it for 15 hours.

[0039] ③ Calcination: The dried and sieved mixture is calcined at high temperature, kept at 1400°C for 4 hours, and then cooled to room temperature with the furnace to obtain layered perovskite red phosphor.

[0040] ④ Grind the obtained pr...

Embodiment 3

[0043] Example 3 # ((Sr 0.9 Eu 0.1 K 0.1 ) 4 Ti 3 o 10 ):

[0044] Composition as in Table 1 3 # Shown, specific preparation method comprises the following steps:

[0045] ① Weighing, ball milling and mixing: Weigh the solid powder raw material according to the composition in Table 1, place it in a high-purity alumina ball milling tank, and add absolute ethanol as the ball milling medium at the same time, the total mass ratio of absolute ethanol to raw material powder is 4:1, the mass ratio of raw material powder: ball = 1:1, put the ball mill jar into the ball mill, set the ball mill speed to 100r / min, and mill for 15h.

[0046] ②Drying: Take out the ball-milled slurry, put it in a drying oven at 70°C, and dry it for 10 hours.

[0047] ③Calcination: The dried and sieved mixture is calcined at a high temperature, kept at 1500°C for 2 hours for calcination, and then cooled to room temperature with the furnace to obtain a layered perovskite red phosphor.

[0048] ④ Gri...

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Abstract

The invention relates to layered perovskite red phosphor for a white LED and a preparation method thereof. The structural formula of the layered perovskite red phosphor is (A1-xMexBx) 4Ti3O10, wherein A is Ca or Sr, Me is rare earth element Eu or rare earth element Pr, B is Li or Na or K, and x is larger than or equal to 0.005 and smaller than or equal to 0.1. The layered perovskite red phosphor is prepared through a solid phase method. The excitation spectrum of the layered perovskite red phosphor ranges from 350 nm to 400 nm, and the layered perovskite red phosphor can be applied to the white LED and other luminescent material fields; the emission wavelength of the layered perovskite red phosphor is in the red light range of 590 nm to 650 nm, the emission intensity is high, and the color purity and the color rending index are high; raw materials are economical, the technology is simple and controllable, an experimental production period is short, and the layered perovskite red phosphor is high in stability.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and relates to a layered perovskite red fluorescent powder for white LEDs and a preparation method thereof. Background technique [0002] White LEDs, as a new type of solid-state lighting device, have been widely used in flat panel display, road lighting and other fields due to their advantages of energy saving, high efficiency, small size, no pollution and planarization. [0003] The currently commercialized way to obtain white light is to excite Y with 460nm blue light GaN chips. 3 al 5 o 12: Ce 3+ Yellow phosphor, the yellow light emitted by the phosphor and the remaining blue light after the chip is excited combine to form white light, and the weak red emission in the spectrum causes its color rendering index to be low, so it is necessary to mix the same excited red powder into the phosphor to Compensate red light emission and improve light conversion efficiency; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
CPCY02B20/00
Inventor 张乐王骋杨浩乔学斌唐定远沈德元
Owner XUZHOU NORMAL UNIVERSITY
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