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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  • Abstract
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  • Claims
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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 r

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

Examples

Experimental program
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Example Embodiment

[0058] The invention also provides a method for preparing phosphors, which includes 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 states of C and D; C is one selected from Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Mn, Cr, Bi, Pb, Fe or The luminescence center of several elements, D is a mixture of alkaline earth metals other than Ba ​​and one or several elements in Zn.

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

Example Embodiment

[0073] Example 1

[0074] Form Ba according to the chemical formula 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 add 0.1288gH 3 BO 3 As a flux, put them in a silica mortar and grind them for 20 minutes to mix the various raw materials. Put the mixed powder into a BN crucible with a relative density of about 30%, then cover with a non-sealed top cover and put it in a corundum tube furnace. Vacuum the high temperature furnace for the purpose of reducing oxygen content , And then pass into the mixed reducing gas that is flowing N with a purity of 99.999% 2 / NH 3 (The volume ratio is 10:1) In an ambient atmosphere, the temperature is increased to 800°C at a heating rate of 10°C / min, and then to 1550°C at a heating rate of 5°C / min. The temperature is kept for 4 hours, and then at 10°C / min. The cooling rate of min is lowered to 800°C and then naturally cooled to room temperature. The obtained ...

Example Embodiment

[0075] Example 2

[0076] Form Ba according to the chemical formula 0.95 Ce 0.05 Si 3 Al 3 O 4 N 5 , Weigh 2.2345gBa(NO 3 ) 2 , 0.9139gAl 2 O 3 , 0.3726gAlN, 1.3151gSi 3 N 4 , 0.0775gCeO 2 The starting powders are put into a silicon nitride mortar and ground for 20 minutes to mix the various raw materials. Put the mixed powder into a BN crucible with a relative density of about 30%, then cover the unsealed top cover, put the BN crucible into the graphite crucible, and finally put the graphite crucible into the vacuum carbon tube furnace. Carry out a vacuum operation, and then pass in flowing N with a purity of 99.999% 2 The temperature is increased 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 at 5°C The cooling rate per minute is cooled to 1200°C and then naturally cooled to room temperature. The obtained powder is taken out and then pulverized into powder in a mortar t...

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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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