Investigation of carrier relaxation dynamics in single CdSe/ZnSe self-organized quantum dot by time-resolved micro-photoluminescence

Takeshi Ota, Yasuhiro Murase, Kenzo Maehashi, Hisao Nakashima, Chikara Watatani, Keiichi Edamatsu, Tadashi Itoh, Kenichi Oto, Kazuo Murase

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We have investigated carrier relaxation dynamics in single CdSe/ZnSe quantum dot (QD) by time-resolved micro-photoluminescence (PL). The discrete sharp lines, originated from individual QD states, exhibit various rise and decay time constants. The decay times of the sharp lines from ground states and excited states are estimated to be 700-800 psec and 400-500 psec, respectively, and the rise times of the ground states become longer compared with those of the excited states. These results are in contrast to successive change of the rise and decay times observed in time-resolved macro-PL with varying the detection wave-length. The quasi-continuum higher states with much shorter decay times are clearly observed over the discrete states of the QDs.

Original languageEnglish
Pages (from-to)448-452
Number of pages5
JournalJournal of Electronic Materials
Volume30
Issue number5
DOIs
Publication statusPublished - 2001 May
Externally publishedYes

Keywords

  • Carrier dynamics
  • Self-organized CdSe quantum dot
  • Single quantum dot
  • Time-resolved micro-photoluminescence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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