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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 4
BKCSDE 33(4)
April 20, 2012 

 
Title
The Characteristics of YAG:Ce Phosphor Powder Prepared Using a NO3-Malonic Acid-NH4NO3-NH3·H2O System
Author
Jin An Jeong, Kyunghwan Park, Dong Hoon Lee, Hong Gun Kim, Yoo Young Kim*
Keywords
YAG:Ce phosphor, Combustion method, Malonic acid
Abstract
Ce-doped Y3Al5O12 (YAG:Ce) phosphor powder was prepared using a NO3 −-malonic acid-NH4NO3-NH3·H2O system. The YAG:Ce precursor was ignited at 240 oC and the resulting powder contained YAG:Ce crystallites (42%) - active in the visible region at 460 nm - amorphous particles (53%) - inactive at visible wavelengths - and less than 3% oxide (3%) crystallite impurities. The impurities transformed to acitive YAG:Ce crystallites at above 800 oC. At above 1000 oC, the amorphous phase became YAG phase and isolated Ce2O crystallites emerged. The powder particles comprised < 4 μm secondary aggregates of 20 nm primary particles. The thermal dusting of the secondary particles coincided with the aggregation of the secondary particles at above 900 oC.
Page
1141 - 1146
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