| Abnormal Energy Dependence of Photoluminescence Decay Time in InGaN Epilayer |
| |
| 作者姓名： | 黄劲松 罗向东 杨旭东 孙征 孙宝权 徐仲英 葛惟昆 |
| |
| 作者单位： | [1]InstituteofSemiconductors,ChineseAcademyofSciences,Beijing100083 [2]DepartmentofPhysics,HongKongUniversityofSciencesandTechnology,HongKong |
| |
| 摘 要： | We employ photoluminescence (PL) and time-resolved PL to study exciton localization effect in InGaN epilayers.By measuring the exciton decay time as a function of the monitored emission energy at different temperatures,we have found unusual behaviour of the energy dependence in the PL decay process. At low temperature, the measured PL decay time increases with the emission energy. It decreases with the emission energy at 200K, and remains nearly constant at the intermediate temperature of 12OK. We have studied the dot size effect on the radiative recombination time by calculating the temperature dependence of the exciton recombination lifetime in quantum dots, and have found that the observed behaviour can be well correlated to the exciton localization in quantum dots. This suggestion is further supported by steady state PL results.
|
| 关 键 词： | 光激发光 异常能量 时滞 激子定位效应 |
Abnormal Energy Dependence of Photoluminescence Decay Time in InGaN Epilayer |
| |
| HUANG Jin-Song,LUO Xiang-Dong,YANG Xu-Dong,SUN Zheng,SUN Bao-Quan,XU Zhong-Ying,GE Wei-Kun.Abnormal Energy Dependence of Photoluminescence Decay Time in InGaN Epilayer[J].Chinese Physics Letters,2004,21(12):2529-2532. |
| |
| Authors: | HUANG Jin-Song LUO Xiang-Dong YANG Xu-Dong SUN Zheng SUN Bao-Quan XU Zhong-Ying GE Wei-Kun |
| |
| Affiliation: | Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083
Department of Physics, Hong Kong University of Sciences and Technology, Hong Kong |
| |
| Abstract: | We employ photoluminescence (PL) and time-resolved PL to study exciton localization effect in InGaN epilayers. By measuring the exciton decay time as a function of the monitored emission energy at different temperatures, we have found unusual behaviour of the energy dependence in the PL decay process. At low temperature, the measured PL decay time increases with the emission energy. It decreases with the emission energy at 200K, and remains nearly constant at the intermediate temperature of 120K. We have studied the dot size effect on the radiative recombination time by calculating the temperature dependence of the exciton recombination lifetime in quantum dots, and have found that the observed behaviour can be well correlated to the exciton localization in quantum dots. This suggestion is further supported by steady state PL results |
| |
| Keywords: | 78 55 -m 78 55 Cr 68 67 Hc |
| 本文献已被 维普 等数据库收录！ |
| 点击此处可从《中国物理快报》浏览原始摘要信息 |
|
点击此处可从《中国物理快报》下载免费的PDF全文 |
