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Silica nitride fluorescent powder and preparation method thereof

A silicon oxynitride and phosphor technology, which is used in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve the problems of brightness reduction and application limitations, and achieve small brightness reduction, high characteristics, and grain size. uniform effect

Inactive Publication Date: 2011-09-14
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are many types of phosphors, including silicate phosphors, phosphate phosphors, aluminate phosphors, sulfide phosphors, etc. Phosphors have the problem of brightness reduction when exposed to excitation sources for a long time. is limited, so it is necessary to explore new phosphor materials with small brightness reduction and stable performance

Method used

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  • Silica nitride fluorescent powder and preparation method thereof
  • Silica nitride fluorescent powder and preparation method thereof
  • Silica nitride fluorescent powder and preparation method thereof

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preparation example Construction

[0058] The present invention also provides a preparation method of fluorescent powder, comprising the following steps:

[0059] 1) According to the chemical expression Ba e C f D. g E. 3+a (Al, Ga, In) 3+b o 4+c N 5+d , calculate the amount of each raw material according to the ratio of each element, where -2C +gv D =2, e>0, v C , v D Represents the valence state of C and D; C is one or The luminescent center of several elements, D is an alkaline earth metal other than Ba ​​and a mixture of one or several elements in Zn.

[0060] Each raw material is: one or several barium-containing compounds in barium oxide or barium carbonate or barium oxalate that can be converted into barium oxide, including Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, One or several elements of Tm, Yb, Mn, Cr, Bi, Pb, Fe, oxides, nitrides or compounds that can be converted into oxides or nitrides, containing alkaline earth metals other than Ba ​​and one of Zn Or several simple substances, oxides, n...

Embodiment 1

[0074] According to the chemical formula Ba 0.85 Eu 0.15 Si 3 Al 3 o 4 N 5 , Weigh 2.6560gBaCO 3 , 1.7536gSi 3 N 4 , 0.3168gEu 2 o 3 , 0.4968gAlN, 1.2186gAl 2 o 3 starting powder, and added 0.1288gH 3 BO 3 As a flux, put them together into a silica mortar and grind thoroughly for 20 minutes to fully mix various raw materials. Put the mixed powder into a BN crucible with a bulk relative density of about 30%, then cover it with a non-sealed top cover, put it into a corundum tube furnace, and vacuumize the high-temperature furnace to reduce the oxygen content , and then pass into the mixed reducing gas, that is, the flowing N with a purity of 99.999% 2 / NH 3 (Its volume ratio is 10:1) in the ambient atmosphere, the temperature was raised to 800°C at a heating rate of 10°C / min, and then to 1550°C at a heating rate of 5°C / min, kept for 4 hours, and then heated at a temperature of 10°C / min Cool down to 800°C at a cooling rate of min, then cool naturally to room tempe...

Embodiment 2

[0076] According to the chemical formula Ba 0.95 Ce 0.05 Si 3 Al 3 o 4 N 5 , weighed 2.2345gBa(NO 3 ) 2 , 0.9139gAl 2 o 3 , 0.3726gAlN, 1.3151gSi 3 N 4 , 0.0775g CeO 2 The starting powder is put into a silicon nitride mortar and ground for 20 minutes to fully mix various raw materials. Put the mixed powder into the BN crucible, the bulk relative density is about 30%, then cover the non-sealed top cover, put the BN crucible into the graphite crucible, and finally put the graphite crucible into the vacuum carbon tube furnace, first Carry out a vacuum operation, and then pass in flowing N with a purity of 99.999% 2 The temperature was raised to 800°C at a heating rate of 4°C / min, then to 1200°C at a heating rate of 6°C / min, and finally to 1600°C at a heating rate of 5°C / min for 8 hours, and then to 5°C / min cooling rate to 1200°C, then naturally cool to room temperature, take out the obtained powder, put it in a mortar and grind it into powder to obtain the required ...

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Abstract

The invention provides a silica nitride fluorescent powder. A general formula of the fluorescent powder is BaeCfDgSi3+a(Al, Ga, In) 3+bO4+cN5+d, wherein a is more than -2 and less than 2; b is more than -2 and less than 2; c is more than -2 and less than 2; d is more than -2 and less than 2; f is not less than 0 and not more than 0.30; g is not less than 0 and not more than 0.5; the sum of 2e+fvC+gvD is 2; e is more than 0; vC and vD represent valence states of C and D; C is a light emitting center of one or more elements selected from Ce (Cerium), Pr (praseodymium), Nd (Neodymium), Sm (Samarium), Eu (Europium), Gd (Gadolinium), Tb (Terbium), Dy (Dysprosium), Ho (Holmium), Er (Erbium), Tm (Thulium), Yb (Ytterbium), Mn (Manganese), Cr (Chromium), Bi (Bismuth), Pb (Plumbum) and Fe (Ferrum); and D is a mixture of one or more elements selected from alkaline-earth metals and Zn (Zinc) except for Ba (Barium). The silica nitride fluorescent powder provided by the invention has the advantages of small brightness reduction while being exposed in an excitation source, excellent conversion efficiency to blue light or near ultraviolet, excellent color purity, thermal stability, high chemical stability, small and uniform crystallite dimension, low calcining temperature, simple process, easiness for continuous industrial production and broad industrial application prospect.

Description

technical field [0001] The invention relates to the field of inorganic luminescent materials, in particular to a silicon oxynitride fluorescent powder and a preparation method thereof. Background technique [0002] Compared with traditional lighting technology, White Light Emitting Diodes (WLED) lighting technology has its significant advantages: light-emitting diodes have small size, low calorific value, low power consumption, long life, fast response, environmental protection, etc. Advantages, flat packaging and easy thinning and other advantages. Among them, white LEDs excited by near-ultraviolet and blue light (360nm-450nm) are widely used in automotive lighting, backlight and other electronic devices. The new Plasma Display Panel (PDP) has the advantages of small size, lighter weight, no X-ray radiation, high brightness, good color reproduction, rich gray scale, and fast response to rapidly changing pictures. More lighting display technologies include trichromatic flu...

Claims

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Application Information

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IPC IPC(8): C09K11/64C09K11/80C09K11/66H01L33/50H01J17/49H01J31/12
CPCY02B20/181Y02B20/00
Inventor 徐鑫唐家业黄凯杨秀芳
Owner UNIV OF SCI & TECH OF CHINA
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