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Oxide sulfide fluorescent powder for white light-emitting diode and preparation method thereof

A light-emitting diode, oxysulfide technology, applied in the field of fluorescent materials, can solve the problems of not meeting the requirements of LED applications, easy to absorb moisture and deliquescence, and large light decay.

Active Publication Date: 2009-12-02
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, the blue LED chip plus YAG:Ce yellow phosphor has been commercialized [T.Tamura, T.Setomoto, and T.Taguchi, J.Lumin.2003, 82, 685; P.Schlotter, J.Baur , C.Hielscher, M.Kunzer, H.Ovloh, R.Schmidt, and J.Schineider, Mater.Sci.Eng.B, 1999, 59, 390], this technology is monopolized by Japan Nichia Company, and its color rendering poor
The second is to coat green and red phosphors on the blue LED chips, but the efficiency of the red phosphors needs to be greatly improved
At present, the red and green phosphors with high conversion efficiency are mostly sulfide systems, which have poor luminous stability, large light attenuation or high cost
Such as the commercialized red phosphor-Eu-doped CaS and SrS, they are extremely hygroscopic and deliquescent [K.Kato, and F.Okamoto, Jpn.J.Appl.Phys.1983, 22, 76], and their poor Stability cannot meet the requirements of LED applications

Method used

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  • Oxide sulfide fluorescent powder for white light-emitting diode and preparation method thereof
  • Oxide sulfide fluorescent powder for white light-emitting diode and preparation method thereof
  • Oxide sulfide fluorescent powder for white light-emitting diode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Raw material ZnO, BaS, MnO according to BaZn0.9998 mn 0.0002 The stoichiometric ratio of OS was weighed, mixed evenly in a device filled with nitrogen or argon, filled with quartz glass, and vacuumed (less than 10 -2 Pa) and sealed with a hydrogen-oxygen flame, the glass tube containing the mixture was slowly heated to 830°C and kept for 24 hours, and then slowly cooled to room temperature. The same as before, finally made BaZnOS:Mn fluorescent material. Zn 0.9998 mn 0.0002 S was prepared by the same method as a reference for luminous intensity comparison. see test results image 3 .

Embodiment 2

[0043] The raw materials ZnO, BaS, MnO according to BaZn 0.9994 mn 0.0006 The stoichiometric ratio of OS was weighed, mixed evenly in a device filled with nitrogen or argon, put into a quartz glass tube, and vacuumed (less than 10 -2 Pa) and sealed with a hydrogen-oxygen flame, the glass tube containing the mixture was slowly heated to 830°C and kept for 24 hours, and then slowly cooled to room temperature. The same as before, finally made BaZnOS:Mn fluorescent material. Zn 0.9994 mn 0.0006 S was prepared by the same method as a reference for luminous intensity comparison. see test results image 3 .

Embodiment 3

[0045] The raw materials ZnO, BaS, MnCO 3 According to BaZn 0.999 mn 0.001 The stoichiometric ratio of OS was weighed, mixed evenly in a device filled with nitrogen or argon, put into a quartz glass tube, and vacuumed (less than 10 -2 Pa) and sealed with a hydrogen-oxygen flame, the glass tube containing the mixture was slowly heated to 830°C and kept for 24 hours, and then slowly cooled to room temperature. The same as before, finally made BaZnOS:Mn fluorescent material. Zn 0.999 mn 0.001 S was prepared by the same method as a reference for luminous intensity comparison. see test results image 3 .

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Abstract

The present invention relates to one kind of doped fluorescent oxysulfide BaZnOS material for white light LED and its preparation process, and features that the fluorescent oxysulfide material Mn or Cu doped BaZnOS in the general expression of BaZn1-xOS:Mnx, where, x=0.0002-0.1, or BaZn1-yOS:Cuy, where, y=0.0002-0.0025. The Mn doped BaZnOS fluorescent material emits red fluorescence with peak at 624 nm, and the Cu doped BaZnOS fluorescent material emits blue fluorescence with peak at 430 nm. The doped BaZnOS fluorescent material is used in white light LED and relevant display and lighting devices. The present invention has unique design, facile materials, simple preparation process, stable chemical property and excellent fluorescence emitting performance.

Description

technical field [0001] The invention relates to an oxysulfide fluorescent powder material which can be used for white light LED (light emitting diode) and a preparation method thereof. Said material is an electro-optical lighting material, which belongs to the field of fluorescent materials. Background technique [0002] White light LED is called the fourth generation green lighting source, which has many advantages compared with traditional incandescent and fluorescent lamps: such as solidification, small size, long life, stable performance, low cost, fast luminous response, etc. [Y.D.Huh, J.Y.Park , S.S. Kweon, J.H. Kim, J.G. Kim, and Y.R. Do, Bull. Korean Chem. Soc. 2004, 25, 1585]. It is widely used in display devices and short-distance, low-speed optical fiber communication light sources. [0003] There are many ways to realize white light LED. Considering factors such as feasibility and applicability, it is an ideal solution to use LED with shorter light-emitting wav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/57H01L33/00
CPCY02B20/181Y02B20/00
Inventor 黄富强夏玉娟王文邓邢精成
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI