Fabrication of white light-emitting diodes based on UV light-emitting diodes with conjugated polymers-(CdSe/ZnS) quantum dots as hybrid phosphors

Hyunchul Jung, Wonkeun Chung, Chang Hun Lee, Sung Hyun Kim

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

White light-emitting diodes (LEDs) were fabricated using GaN-based 380-nm UV LEDs precoated with the composite of blue-emitting polymer (poly[(9,9-dihexyl?uorenyl-2,7-diyl)-alt-co-(2-methoxy5-{2-ethylhexyloxy}-1, 4-phenylene)]), yellow green-emitting polymer (poly[(9,9-dioctyl?uorenyl-2, 7diyl)-co-(1,4-benzo-{2, 1′, 3}-thiadiazole)]), and 605-nm red-emitting quantum dots (QDs). CdSe cores were obtained by solvothermal route using CdO, Se precursors and ZnS shells were synthesized by using diethylzinc, and hexamethyldisilathiane precursors. The optical properties of CdSe/ZnS QDs were characterized by UV-visible and photoluminescence (PL) spectra. The structural data and composition of the QDs were transmission electron microscopy (TEM), and EDX technique. The quantum yield and size of the QDs were 58.7% and about 6.7 nm, respectively. Three-band white light was generated by hybridizing blue (430 nm), green (535 nm), and red (605 nm) emission. The color-rendering index (CRI) of the device was extremely improved by introducing the QDs. The CIE-1931 chromaticity coordinate, color temperature, and CRI of a white LED at 20 mA were (0.379, 0.368), 3969 K, and 90, respectively.

Original languageEnglish
Pages (from-to)5407-5411
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume12
Issue number7
DOIs
Publication statusPublished - 2012 Jul

Keywords

  • CdSe/ZnS Quantum Dot
  • Conjugated Polymer
  • White Light-Emitting Diode

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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