EXCITON-PHONON INTERACTION IN MIXED SILVER-HALIDES - RESONANT RAMAN-SCATTERING VS PHOTO-LUMINESCENCE

被引：3

作者：

KOUMVAKALIS, N ^{[1
]}

STOLZ, H ^{[1
]}

VONDEROSTEN, W ^{[1
]}

机构：

[1] GESAMTHSCH PADERBORN,FACHBEREICH NATURWISSENSCH I,D-4790 PADERBORN,FED REP GER

来源：

SOLID STATE COMMUNICATIONS | 1979年 / 32卷 / 11期

关键词：

D O I：

10.1016/0038-1098(79)90834-2

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

An investigation of resonant Raman scattering in mixed crystals of AgBr:Cl at 1.8 K shows that the zero-phonon and LO phonon-assisted exciton luminescence excited in the free indirect exciton absorption, exhibits an anomalous dependence on the exciton photon energy EL. Close to the exciton gap, the bands show a Raman-like behaviour with their peaks at constant energetic distance from EL. As EL is tuned further into the absorption, the bands gradually develop into normal photoluminescence. The effect is explained by taking into account exciton relaxation via scattering by long-wavelength acoustic phonons, a process which is strongly energy dependent. In addition, resonant Raman scattering observed for excitation in the zero-phonon absorption suggests study for the first time of the mode behaviour of certain off-zone center phonons in this system. © 1979.

引用

页码：1079 / 1081

页数：3

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