Excitonic state in anatase TiO2 single crystal

被引：57

作者：

Hosaka, N ^{[1
]}

Sekiya, T ^{[1
]}

Kurita, S ^{[1
]}

机构：

[1] YOKOHAMA NATL UNIV,FAC ENGN,APPL PHYS LAB,YOKOHAMA,KANAGAWA 240,JAPAN

来源：

JOURNAL OF LUMINESCENCE | 1997年 / 72-4卷

关键词：

anatase; TiO2; self-trapped exciton; steepness index;

D O I：

10.1016/S0022-2313(96)00253-0

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Temperature dependence of polarized absorption near the band gap was measured for as-grown anatase single crystals and annealed ones which were heat-treated in oxygen atmosphere. The steepness index obtained indicates that an exciton is self-trapped. An absorption band appears at 2.9 eV after heat treatment. A broad luminescence was observed at 2.3 eV. The large Stokes shift is consistent with the fact that the exciton relaxes to a self-trapped state.

引用

页码：874 / 875

页数：2