Enhancing the color rendering index for phosphor-converted white LEDs using cadmium-free CuInS2/ZnS QDs

Po Hsiang Chuang, Chun Che Lin, Heesun Yang, Ru Shi Liu

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

CuInS2 (CIS) I-III-VI-type quantum dots (QDs) were synthesized under different growth times by the facile solvothermal method. Emission wavelengths showed a deep red region (630-650 nm) with low quantum yields (QYs). The core CIS was effectively passivated by the coating layer of ZnS, thereby remarkably increasing the QYs (48% and 82%) and causing the blue shift of the emission band (580-623 nm). Red-emitting CIS/ZnS QDs that were blended with Y 3Al5O12:Ce3+ phosphor-based white light-emitting diodes (LEDs) were further demonstrated. The color rendering index of white LEDs was improved (Ra = 86) by using red-emitting CIS/ZnS QDs with broader spectra. The optical properties were evaluated under various forward currents; these properties included the electroluminescence spectra and luminous efficiency of CIS/ZnS QDs-assisted white LEDs. These results clearly showed that CIS/ZnS QDs are promising candidates for application in white LEDs.

Original languageEnglish
Pages (from-to)801-806
Number of pages6
JournalJournal of the Chinese Chemical Society
Volume60
Issue number7
DOIs
Publication statusPublished - Oct 21 2013
Externally publishedYes

Keywords

  • Color rendering index
  • CuInS2 I-III-VI
  • Quantum dots
  • White light-emitting diodes

ASJC Scopus subject areas

  • Chemistry(all)

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