Fine tuning of emission property of white light-emitting diodes by quantum-dot-coating on YAG:Ce nanophosphors

Dal Sung Kong, Min Jeong Kim, Hee Jo Song, In Sun Cho, Sohee Jeong, Hyunjung Shin, Sangwook Lee, Hyun Suk Jung

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

We report fine tuning of emission color of Ce-doped yttrium aluminum garnet (Y 3 Al 5 O 12 :Ce 3+ , YAG:Ce) nanophosphor-based white light-emitting diodes (WLED), by coating CdSe/CdS/ZnS quantum dots (QDs) onto the surface of the YAG:Ce nanoparticles via surface functionalization of both the QDs and the YAG:Ce. Mixture of bromo-functionalized QDs and amino-functionalized YAG:Ce nanoparticles results in conformal coating of the QDs onto the YAG:Ce nanoparticles (QD@YAG:Ce). By varying the QD to YAG:Ce weight ratios, the luminescence spectra of the QD@YAG:Ce are tuned. A high-quality warm-white-light emission is achieved by appropriate combination of the yellow and red emissions from the QD@YAG:Ce, and the blue emission from InGaN LED chip. However, without surface functionalization, irregular mixtures of YAG:Ce and QDs are formed, which consequently make it hard to control the emission spectra. This study demonstrates a promising way to prepare uniformly QD-coated nanophosphors and an approach to control the emission spectra the nanophosphors.

Original languageEnglish
Pages (from-to)467-473
Number of pages7
JournalApplied Surface Science
Volume379
DOIs
StatePublished - 30 Aug 2016

Keywords

  • LED
  • Nanophosphor
  • QD
  • Surface functionalization
  • Warm white light
  • YAG

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