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SrAl2O4:Eu2+,Dy3+ nanobelts: Synthesis by combustion and properties of long-persistent phosphorescence

Published online by Cambridge University Press:  13 May 2011

Baochang Cheng ,
Zhaodong Zhang ,
Zhihui Han ,
Yanhe Xiao  and
Shuijin Lei
Baochang Cheng*
Affiliation:
Institute for Advanced Studying and School of Materials Science and Engineering, Nanchang University, Nanchang 330031, People’s Republic of China
Zhaodong Zhang
Affiliation:
Institute for Advanced Studying and School of Materials Science and Engineering, Nanchang University, Nanchang 330031, People’s Republic of China
Zhihui Han
Affiliation:
Institute for Advanced Studying and School of Materials Science and Engineering, Nanchang University, Nanchang 330031, People’s Republic of China
Yanhe Xiao
Affiliation:
Institute for Advanced Studying and School of Materials Science and Engineering, Nanchang University, Nanchang 330031, People’s Republic of China
Shuijin Lei
Affiliation:
Institute for Advanced Studying and School of Materials Science and Engineering, Nanchang University, Nanchang 330031, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: bcheng@vip.sina.com
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Abstract

SrAl2O4:Eu2+,Dy3+ polynary complex nanobelts with long-persisting phosphorescence were synthesized via a facile but efficient combustion method followed by a postannealing reaction at temperature above 900 °C. All the samples emit greenish-yellow light from the d-f transition of Eu2+, and moreover, their wavelength redshifts with increasing calcination temperature since the increase in crystal size and crystalline quality causes a large average optical path and high crystal symmetry, respectively. The decay constant of the sample calcined at low temperature is smaller than that of the one annealed at high temperature owing to the presence of higher densities and depths of electron traps donated by host defects, and the initial brightness of the sample calcined at low temperature is relatively low owing to the small volume fraction from relatively low crystallinity.

Keywords

Combustion synthesisNanostructureOptical properties
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 17: Focus Issue: Nanowires: Fundamentals and Applications , 14 September 2011 , pp. 2311 - 2315
Copyright
Copyright © Materials Research Society 2011

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