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Photoluminescence of Nano-scaled YAG:Ce Phosphor Powders

Published online by Cambridge University Press:  01 February 2011

In-Gann Chen ,
Yulin Chen ,
Chii-Shyang Hwang ,
F.S. Juang ,
S.J. Chang ,
Y.K. Su ,
G.O. Mueller  and
R. Mueller-Mach
In-Gann Chen
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan TAIWAN
Yulin Chen
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan TAIWAN
Chii-Shyang Hwang
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan TAIWAN
F.S. Juang
Affiliation:
Department of Electro-Optics Engineering, National Huwei Inst. of Tech, Huwei, Yunlin, Taiwan.
S.J. Chang
Affiliation:
Department of Electrical Engineer, National Cheng Kung University, Tainan, TAIWAN
Y.K. Su
Affiliation:
Department of Electrical Engineer, National Cheng Kung University, Tainan, TAIWAN
G.O. Mueller
Affiliation:
Lumileds Lighting, LLC, San Jose, CA, U.S.A.
R. Mueller-Mach
Affiliation:
Lumileds Lighting, LLC, San Jose, CA, U.S.A.
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Abstract

Four series of YAG:Ce phosphor powders were synthesized by solid state, co-precipitation, and sol-gel (with two different growth inhibitors, HMDS and PAA respectively) methods, which results in the average particle sizes of 800, 56, 43, and 32 nm respectively. All the nano-scale YAG powders were heat treated below 1000_. Both TEM and XRD results of these nano-scale YAG powders show high degree of crystalline structure. Photoluminescence (PL) characterization shows that the nano-scale YAG phosphor powders emit a higher intensity of luminescence than that of sub-micro sized samples. The effect of different Ce doping level on the PL of (Y3-xCex)Al5O12 shows a maximum at x ∼ 0.01. The Commissiom International de I.Eclairage (CIE) chromaticity coordinates were determined and show different trends of shifts in the resulting PL spectra. Systematic study of the processing parameters characterized by DTA/TGA, XRD, FTIR, and BET will be discussed in detail in the report.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 727: Symposium R – Nanostructured Interfaces , 2002 , R8.1
Copyright
Copyright © Materials Research Society 2002

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