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Red phosphor powder and preparation method thereof

A technology of red fluorescent powder and chemical structural formula, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve problems such as low luminous efficiency, low luminous efficiency of packaged LEDs, and restrictions on the industrial production and application of phosphors, and achieve luminescence Efficiency improvement, broad application prospects, and stable properties

Inactive Publication Date: 2016-03-16
HANGZHOU YINGHE PHOTOELECTRONICS MATERIALS
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  • Abstract
  • Description
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Problems solved by technology

[0005] So far, this silicon-based nitride red phosphor still has the following defects: (1) The luminous efficiency is still low, only about half of the brightness of YAG yellow phosphor
(2) Due to the wide emission spectrum of this series of nitride phosphors, there is still a lot of emission above 700nm, resulting in low light efficiency of the packaged LED
(3) Due to the relative inertness of nitride phosphor raw materials, the synthesis of silicon-based nitride phosphors usually requires harsh conditions such as active raw materials, high temperature and high pressure, which greatly restricts the industrial production and application of this series of phosphors

Method used

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  • Red phosphor powder and preparation method thereof
  • Red phosphor powder and preparation method thereof
  • Red phosphor powder and preparation method thereof

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preparation example Construction

[0035]The preparation method of the above-mentioned red fluorescent powder is a multi-step nitriding reaction in which the compound hydride is dehydrogenated and then nitrided, including the following steps in sequence:

[0036] 1) Press Ca 1-x-y Sr x Eu y L z Al 3 o δ N 4-δ The stoichiometric ratio weighs raw materials, grinds and mixes;

[0037] 2) Roasting the material obtained in step A at a high temperature in a reducing atmosphere at a temperature of 800 to 1300° C. and a firing time of 1 to 15 hours;

[0038] 3) Crushing and sieving the material obtained in step B to obtain a nitride red phosphor.

Embodiment 1

[0040] Weigh SrH 2 (4N)0.0996mol, LiAlH 4 (4N)0.1mol, AlN(4N)0.06667mol, Eu 2 o 3 (4N) 0.0002mol; put the above raw materials into the boron nitride crucible after mixing evenly in the glove box, and then quickly move it into the tube furnace, at 900 ℃ 0.1MpaN 2 Insulated in the atmosphere for 4 hours, the resulting product is crushed, washed to remove impurities, sieved, and dried to obtain the phosphor Sr 0.996 Eu 0.004 LiAl 3 o 0.006 N 3.96 . The SEM electron microscope picture, XRD collection of illustrative plates and absorption spectrogram of embodiment 1 are shown in figure 1 , figure 2 with image 3 .

Embodiment 2

[0042] Weigh CaH 2 (4N)0.0996mol, LiAlH 4 (4N)0.1mol, AlN(4N)0.06667mol, Eu 2 o 3 (4N) 0.0002mol; put the above raw materials into the boron nitride crucible after mixing evenly in the glove box, and then quickly move it into the tube furnace, at 900 ℃ 0.1MpaN 2 Insulated in the atmosphere for 4 hours, the resulting product is crushed, washed to remove impurities, sieved, and dried to obtain the phosphor Ca 0.996 Eu 0.004 LiAl 3 o 0.006 N 3.96 .

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Abstract

The present invention discloses red phosphor powder and a preparation method thereof, wherein the chemical structure formula of the red phosphor powder is Ca1-x-ySrxEuyLzAl3O[delta]N4-[delta], L is at least one selected from Li, Na and K, X is more than or equal to 0 and is less than 1, Y is more than 0 and is less than or equal to 0.1, Z is more than or equal to 0.5 and is less than or equal to 1, and [delta] is more than 0 and is less than 0.5. According to the present invention, the trace oxygen is introduced to balance the charge so as to improve the light emitting efficiency of the synthesized red phosphor powder; the phosphor powder can emit narrow brand visible light having the peak value of 630-680 nm under excitation of 400-500 nm violet light or blue light so as to improve the color rendering index of the product and meet the application requirements of the backlight and the display product on the narrow peak emission phosphor powder; and the red phosphor powder is prepared through the multi-step nitriding reaction method of the composite hydride dehydrogenation nitriding, and can be used for high color rendering index illumination, and backlighting and display devices.

Description

technical field [0001] The invention relates to the fields of lighting technology, display and optoelectronic materials, in particular to a red fluorescent powder and a preparation method thereof. Background technique [0002] The United States, Japan, Europe and China have successively issued policies restricting incandescent lamps, mercury lamps and dichromatic fluorescent lamps, and the American Energy Star standard stipulates that the color rendering index of indoor lighting CRI≥80, and some high-end applications require CRI≥ 90. As a new generation of solid-state lighting and display technology, LEDs can meet the requirements for high color rendering through various methods. Adding high-quality LED red phosphor is one of the important means. [0003] m 2 Si 5 N 8 :Eu 2+ (M=Ca, Sr, Ba) and CaAlSiN 3 :Eu 2+ This kind of nitride red phosphor has very stable physical and chemical properties, is stable and does not decompose in air and water, and has the advantages o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80C09K11/64H01L33/50
Inventor 王风昌邹行施威邓华支波
Owner HANGZHOU YINGHE PHOTOELECTRONICS MATERIALS
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