Self-trapping of excitons in PbI2 clusters formed in Pb1-xCdxI2 mixed crystals

被引：4

作者：

Gu, P ^{[1
]}

Hayashi, T ^{[1
]}

机构：

[1] KYOTO UNIV, FAC INTEGRATED HUMAN STUDIES, DEPT FUNDAMENTAL SCI, KYOTO 60601, JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1997年 / 66卷 / 03期

关键词：

mixed crystals; luminescence; free exciton; self-trapped exciton;

D O I：

10.1143/JPSJ.66.868

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Luminescence of PbI2 clusters formed in Pb1-xCdxI2 mixed crystal has been investigated in the range of Pb2+ composition between 20 mol% and 40 mol%: The spectrum consists of a band of free exciton luminescence near the absorption edge and a band with large Stokes-shift. Temperature and excitation energy dependences of the spectra and decay profiles of the luminescence indicate that the low energy band originates from self-trapping of excitons in the clusters. Stability between the free and self-trapped exciton states is governed by the exciton hand width which depends on the size of clusters.

引用

页码：868 / 872

页数：5