Enhanced photoluminance of layered quantum dot-phosphor nanocomposites as converting materials for light emitting diodes

Ju Yeon Woo, Kyungnam Kim, Sohee Jeong, Chang Soo Han

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

This paper reports on the enhanced photoluminescence (PL) of nanocomposites through the layered structuring of phosphor and quantum dot (QD). Green phosphor of Sr2SiO4:Eu, red QDs of CdSe/CdS/CdZnS/ZnS core-multishell, and thermo-curable resin were used for this study. Two kinds of composite (layered and mixed) were prepared, and the schemes for optical energy transfer between QD and phosphor were suggested and investigated based on PL decay characteristics. It was found that the layered structure is more effective than the mixed one with respect to PL intensity, PL decay, and thermal loss. When this layered nanocomposite (QDs on phosphor) is used to make a white light emitting diode (LED), the brightness is increased by 37%, and the color rendering index (CRI) value is raised to 88.4 compared to the mixed case of 80.4.

Original languageEnglish
Pages (from-to)20945-20952
Number of pages8
JournalJournal of Physical Chemistry C
Volume115
Issue number43
DOIs
Publication statusPublished - 2011 Nov 3

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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