NDLI: Preparation and performance of white LED packaged YAG phosphor

Content Provider	IEEE Xplore Digital Library
Author	Rongfeng Guan Wenqing Zhao Shuaimou Li
Copyright Year	2009
Description	Author affiliation: Institute of Materials Science and Engineering, Henan Polytechnic University No. 2001, Century Avenue, Jiaozuo 454003, Henan Province, China (Rongfeng Guan; Wenqing Zhao; Shuaimou Li)
Abstract	In recent years, the preparation technology of the white light LED packaged YAG phosphor develops very quickly. The preparation methods include solid-phase method, sol-gel method, precipitation method, combustion method and so on. The traditional solid-phase method is still dominant in all of them, whereas this method also has shortcomings such as a high synthesis temperature, longer reaction time, bulky grains and larger hardness. So it requires a new approach to achieve the phosphor synthesis. Using metal nitrate as raw materials and citric acid as a complexing agent, we prepared $Y3A15O12:Ce^{3+}$ yellow phosphor by the sol-gel method (sol-gel). The X-ray powder diffraction (XRD) shows that it has been pure yttrium aluminum garnet phase (YAG) at 900°C. The infrared absorption spectra of the powders show that YAG phase has been formed when the calcination temperature is 900°C, because there are the characteristic vibrational peaks of metal and oxygen atoms, which are in the low-frequency area at $724cm^{−1},$ $792cm^{−1}$ peak. With scanning electron microscopy (SEM) analysis of its morphology, the result proves the grain diameter ranges from 1 to 3μm, averaged at 2μm. Their fluorescence spectra were studied using fluorescence spectrometer and the results show luminous intensity reach at the maximum when calcination temperature up to 1200°C.
Starting Page	786
Ending Page	789
File Size	778000
Page Count	4
File Format	PDF
ISBN	9781424446582
DOI	10.1109/ICEPT.2009.5270641
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-08-10
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Light emitting diodes Packaging Phosphors Temperature Powders Calcination Scanning electron microscopy Fluorescence Combustion Raw materials
Content Type	Text
Resource Type	Article

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