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8478510 
Journal Article 
Investigation on charge transfer bands of Ce4+ in Sr2CeO4 blue phosphor 
Li, L; Zhou, S; Zhang, S; , 
2008 
Yes 
Chemical Physics Letters
ISSN: 0009-2614 
ELSEVIER SCIENCE BV 
AMSTERDAM 
283-289 
WOS:000254129500030 
Bulk and nano-materials Sr2CeO4 were prepared by solid-state reaction and sol-gel technique, respectively. Photoluminescence shows that luminescence has the characteristic of a ligand-to-metal charge transfer (CT) emission. Compared with bulk Sr2CeO4, the nano-material exhibits stronger emission intensity, longer decay time, and higher CT excitation energy. Three CT excitation peaks were observed in both bulk and nano samples. Based on the theoretical calculations of the average energy gap of the chemical bond using the dielectric theory of complex crystal, the highest and the lowest energy CT bands were assigned to the transitions O1 -> Ce4+ and O-2 -> Ce4+, respectively. The middle bands were due to the superposition of the transitions Ce-O1 and Ce-O2. (c) 2008 Elsevier B. V. All rights reserved.