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Near-ultraviolet-excited fluorophosphates-base fluorescent powder and preparation method thereof

A technology of fluorophosphate and phosphor, which is applied in the field of fluorophosphate-based phosphor and its preparation, can solve the problems of high correlated color temperature and low color rendering of white LED, and achieve the effects of high luminous efficiency and wide excitation spectrum range

Active Publication Date: 2018-01-19
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a fluorophosphate-based phosphor for near-ultraviolet excitation and its preparation method, which solves the problems of low color rendering and high correlated color temperature of currently obtained white LEDs due to the lack of red light components

Method used

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  • Near-ultraviolet-excited fluorophosphates-base fluorescent powder and preparation method thereof
  • Near-ultraviolet-excited fluorophosphates-base fluorescent powder and preparation method thereof
  • Near-ultraviolet-excited fluorophosphates-base fluorescent powder and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] Weigh SrCO 3 33.22 grams, Lu 2 o 3 19.90 g, NH 4 h 2 PO 4 34.51 g, SrF 2 7.53 g, Na 2 CO 3 5.30 g, Eu 2 o 3 1.06 g, MnCO 3 1.03 grams, fully ground and mixed, put into an alumina crucible, cover the crucible lid, put into a high-temperature furnace, at a temperature of 900 ° C ~ 1200 ° C, H 2 / N 2 H in the mixture 2 The content is 5%-20% in a reducing atmosphere, roasted for 1-5 hours, taken out when cooled to room temperature, and after grinding and dispersing, a nitrogen oxide-based phosphor powder for near-ultraviolet excitation is obtained, which consists of (Sr 0.95 Eu 0.02 mn 0.03 ) 6 Lu 2 Na 2 P 6 o 24 f 2 .

Embodiment 2

[0026] Weigh SrCO 3 32.77 grams, Lu 2 o 3 19.90 g, NH 4 h 2 PO 4 34.51 g, SrF 2 7.53 g, Na 2 CO 3 5.30 g, Eu 2 o 3 2.64 g, MnCO 3 1.37 grams, fully ground and mixed, put into an alumina crucible, cover the crucible lid, put into a high-temperature furnace, at a temperature of 900 ° C ~ 1200 ° C, H 2 / N 2 H in the mixture 2 The content is 5%-20% in a reducing atmosphere, roasted for 1-5 hours, taken out when cooled to room temperature, and after grinding and dispersing, a nitrogen oxide-based phosphor powder for near-ultraviolet excitation is obtained, which consists of (Sr 0.94 Eu 0.02 mn 0.04 ) 6 Lu 2 Na 2 P 6 o 24 f 2 . .

Embodiment 3

[0028] Weigh SrCO 3 32.33 grams, Lu 2 o 3 19.90 g, NH 4 h 2 PO 4 34.51 g, SrF 2 7.53 g, Na 2 CO 3 5.30 g, Eu 2 o 3 2.64 g, MnCO 3 1.72 grams, fully ground and mixed, put into an alumina crucible, cover the crucible lid, put into a high-temperature furnace, at a temperature of 900 ° C ~ 1200 ° C, H 2 / N 2 H in the mixture 2 The content is 5%-20% in a reducing atmosphere, roasted for 1-5 hours, taken out when cooled to room temperature, and after grinding and dispersing, a nitrogen oxide-based phosphor powder for near-ultraviolet excitation is obtained, which consists of (Sr 0.93 Eu 0.02 mn 0.05 ) 6 Lu 2 Na 2 P 6 o 24 f 2 .

[0029] The single-matrix white light phosphor powder provided by the present invention can emit relatively stable white light under the excitation of 250-420nm ultraviolet light, which improves the disadvantages of color imbalance caused by multi-phase mixing of three primary color phosphor powders, and avoids the red and green phosphor...

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Abstract

The invention discloses near-ultraviolet-excited fluorophosphates-base fluorescent powder and a preparation method thereof. A chemical constitution formula of the fluorescent powder is (Sr1-0.02-xEu0.02Mnx)6Lu2Na2P6O24F. The preparation method comprises the following steps: weighing corresponding compounds as starting raw materials of reaction according to the chemical constitution formula, and uniformly mixing, wherein the element F exceeds the amount by 10%-50%; roasting the obtained mixture at 900-1300 DEG C for 1-10 hours in a reducing atmosphere, so as to obtain the fluorescent powder; and grinding and dispersing the obtained fluorescent powder, so as to obtain near-ultraviolet-excited europium-manganese-codoped fluorophosphates-base fluorescent powder. The near-ultraviolet-excited fluorophosphates-base fluorescent powder has the beneficial effects that the excitation spectrum range is relatively wide, and the light emitting efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of novel fluorescent materials, and relates to a fluorophosphate-based fluorescent powder for near-ultraviolet excitation and a preparation method thereof. Background technique [0002] The all-solid-state light source white LED has many advantages such as high conversion efficiency, long life, and no pollution, showing broad market prospects and great application value. At present, white LEDs are widely used in liquid crystal display backlight, color display, traffic lights, landscape lighting and other fields. At the same time, in the field of indoor lighting, they are expected to replace various bulbs and fluorescent lamps and become a new generation of general lighting sources. , Improving the quality of life of the people has extensive and far-reaching significance. [0003] White light LEDs can be obtained through the combination of chips and phosphors. At present, the combination of "blue light chips...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/86
Inventor 焦蒙蒙徐钦峰杨传路刘明良
Owner LUDONG UNIVERSITY