Luminescent properties of phosphor converted LED using an orange-emitting Rb 2CaP 2O 7:Eu 2+ phosphor

Hee Jo Song, Dong Kyun Yim, In Sun Cho, Hee Suk Roh, Ju Seong Kim, Dong Wan Kim, Kug Sun Hong

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A series of orange-emitting Rb 2CaP 2O 7:Eu 2+ phosphors were synthesized by a conventional solid-state reaction method. The as-prepared phosphors were characterized by X-ray powder diffraction (XRD), fluorescence spectroscopy, and spectroradiometry. XRD showed that all prepared samples exhibited a monoclinic Rb 2CaP 2O 7 phase. Fluorescence spectroscopy showed that the photoluminescence efficiency of Rb 2Ca 1-xP 2O 7:Eu x 2+ phosphors increased with increasing Eu 2+ concentration until x = 0.006, then decreased at higher concentrations, due to a concentration quenching effect. The thermal activation energy was also measured to be 0.40 eV. Furthermore, a phosphor-converted LED (pc-LED) coated with Rb 2Ca 0.994P 2O 7:Eu 0.006 2+ was fabricated, which exhibited bright orange emission under a forward bias, from 200 to 300 mA. The color rendering index (CRI) of pc-LED coated with Rb 2Ca 0.994P 2O 7:Eu 0.006 2+ was higher than the CRI of pc-LED coated with commercial red phosphor, due to the broad emission band of Rb 2CaP 2O 7:Eu 2+ phosphor. In applying with three-band pc-LEDs, moreover, white pc-LED using Rb 2CaP 2O 7:Eu 2+ phosphor had a higher CRI, than using commercial phosphor. These results indicated that Rb 2CaP 2O 7:Eu 2+ phosphor could be a good candidate for a near-UV based w-LED.

Original languageEnglish
Pages (from-to)4522-4526
Number of pages5
JournalMaterials Research Bulletin
Volume47
Issue number12
DOIs
Publication statusPublished - 2012 Dec

Keywords

  • A. Inorganic compounds
  • A. Optical materials
  • D. Luminescence
  • D. Optical properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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