A novel green-emitting Ca15(PO4)2(SiO 4)6:Eu2+ phosphor for applications in n-UV based w-LEDs

Seyoon Hur, Hee Jo Song, Hee Suk Roh, Dong Wan Kim, Kug Sun Hong

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A novel green-emitting phosphor Eu2+-doped Ca 15(PO4)2(SiO4)6 with a structure derivative of α′-Ca2SiO4 is synthesized by a conventional solid-state reaction method. The photoluminescence properties, the concentration quenching of Eu2+ ion, and the thermal stability are investigated. The Ca15(PO4) 2(SiO4)6:Eu2+ phosphor is excited efficiently at a wavelength of 330 nm. At the optimum doping concentration of 0.5 mol% Eu2+ ion, the Ca15(PO4) 2(SiO4)6:Eu2+ phosphor has the strongest emission intensity at 491 nm. The main mechanism of concentration quenching is found to be the rapid migration of excitation between the excited Eu2+ ions by exchange coupling. The thermal activation energy barrier is confirmed as 0.244 eV. Furthermore, the performance of this phosphor is tested by the fabrication of a phosphor-converted LED (pc-LED) through the integration of an InGaN-based near-ultraviolet light-emitting diode (LED) and driving under from 50 mA to 300 mA. The pc-LED reveals high color rendering index (CRI) value over 50, which is good for applications in w-LED.

Original languageEnglish
Pages (from-to)350-354
Number of pages5
JournalMaterials Chemistry and Physics
Volume139
Issue number2-3
DOIs
Publication statusPublished - 2013 May 15

Keywords

  • A. Optical materials
  • B. Heat treatment
  • C. Photoluminescence spectroscopy
  • D. Luminescence

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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