Exciton-phonon coupling in indirect gap AgBr nanocrystals

被引：7
|
作者：
Vogelsang, H [1 ]
Stolz, H [1 ]
vonderOsten, W [1 ]
机构：
[1] UNIV GESAMTHSCH PADERBORN,FACHBEREICH PHYS,D-33095 PADERBORN,GERMANY
来源：
JOURNAL OF LUMINESCENCE | 1996年 / 70卷 / 70期
关键词：
exciton-phonon interaction; resonant Raman scattering; AgBr nanocrystals;
D O I：
10.1016/0022-2313(96)00075-0
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The resonance Raman scattering observed in the exciton region of indirect AgBr nanocrystals with mean particle radius (R) approximate to 5 nm is analyzed. Considering the processes as absorption followed by emission and calculating the size dependent exciton energies by the donor-like exciton model of Ekimov et al. [1], the ITO(L) and 2TO(L)&LO(Gamma) resonance behavior can be well-reproduced. The analysis of the Raman spectral lineshape based on linear exciton-phonon coupling shows a substantial increase of coupling strength with excitation photon energy. It is attributed to enhanced acoustic and surface phonon interaction of higher exciton states.
引用
收藏
页码：414 / 420
页数：7
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