Photoluminescence characterization of ZnCdSe/ZnSe quantum dot systems with different ZnCdSe coverages

Jen Yi Jen, Chen Yen Lin, Jia Ren Lee, Chien Rong Lu*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

3 引文 斯高帕斯(Scopus)

摘要

We have characterized the temperature and excitation power density dependence of the photoluminescence (PL) spectra from ZnCdSe/ZnSe quantum dot (QD) system with different ZnCdSe coverages. A single spectral peak was observed from the sample composed of thick ZnCdSe layers while two peaks were observed from those with thin ZnCdSe layers. The temperature dependence of the peak position and width indicated that the spectral features originated from three-dimensionally confined QD systems. The relative intensity of spectral peaks remained the same even when the excitation power density was 80-fold weaker, and verified that different spectral lines originated from different groups of QDs instead of emissions from different excited states within one group of QDs. The thickness variation of spectral profiles also characterized the growth-mode evolution with the ZnCdSe thickness.

原文英語
頁(從 - 到)485-489
頁數5
期刊Journal of Physics and Chemistry of Solids
69
發行號2-3
DOIs
出版狀態已發佈 - 2008 二月

ASJC Scopus subject areas

  • 化學 (全部)
  • 材料科學(全部)
  • 凝聚態物理學

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