Influence of shell thickness on the performance of light-emitting devices based on CdSe/Zn 1- X Cd x S core/shell heterostructured quantum dots

Jaehoon Lim, Byeong Guk Jeong, Myeongjin Park, Jai Kyeong Kim, Jeffrey M. Pietryga, Young Shin Park, Victor I. Klimov, Changhee Lee, Doh C. Lee, Wan Ki Bae

Research output: Contribution to journalArticle

150 Citations (Scopus)

Abstract

The rapid advance and growth of the display industry has provided an impetus for the development of novel emissive materials for high-energy-efficiency light-emitting diodes (LED). Quantum dots (QD) offer narrow, size-tunable emission over the full visible wavelength region, and consequently have received particular attention as a class of high-color-purity fluorophores. However, PL lifetimes drastically decrease when QDs are assembled into compact films and decrease further within the actual devices, with a severity noticeably dependent on shell thickness. Intriguingly, this tendency is markedly similar to absolute PL QYs measured on the same samples using an integrating sphere spectrometer. Spectroscopic analysis of the QLEDs demonstrates the influence of nonradiative recombination processes on the overall device characteristics.

Original languageEnglish
Pages (from-to)8034-8040
Number of pages7
JournalAdvanced Materials
Volume26
Issue number47
DOIs
Publication statusPublished - Jan 1 2014

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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