Variation of fluorescence lifetimes and Judd-Ofelt parameters between Eu3+ doped bulk and nanocrystalline cubic LU2O3

被引:252
作者
Boyer, JC
Vetrone, F
Capobianco, JA
Speghini, A
Bettinelli, M
机构
[1] Concordia Univ, Dept Chem & Biochem, Montreal, PQ H4B 1R6, Canada
[2] Univ Verona, Dipartimento Sci & Tecnol, I-37134 Verona, Italy
[3] INSTM, I-37134 Verona, Italy
关键词
D O I
10.1021/jp0480504
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The luminescent properties of 1 mol % Eu3+ -doped cubic Lu2O3 nanocrystals prepared by a combustion synthesis route were investigated. The visible emission spectrum of the europium doped Lu2O3 nanocrystals indicate that the structural environment surrounding the dopant Eu3+ ion is distorted when compared to a bulk sample with a micrometer particle size. From the resulting emission spectra, the Omega(2) and Omega(4) Judd-Ofelt intensity parameters were calculated. The lifetimes of the D-5(0) excited state for both the C-2 and C-3i sites were found to be nearly double that found for a similarly doped sample with larger particle size (bulk sample). This behavior is attributed to a change in the refractive index of the nanocrystalline material that in turn modifies the oscillator strength of the 4f <----> 4f transitions.
引用
收藏
页码:20137 / 20143
页数:7
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