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

9 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
Externally publishedYes

Fingerprint

Phosphors
phosphors
Light emitting diodes
light emitting diodes
Ions
Quenching
quenching
Exchange coupling
ions
Energy barriers
Solid state reactions
ultraviolet radiation
Photoluminescence
Thermodynamic stability
thermal stability
Activation energy
Doping (additives)
activation energy
Color
Derivatives

Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

A novel green-emitting Ca15(PO4)2(SiO 4)6 : Eu2+ phosphor for applications in n-UV based w-LEDs. / Hur, Seyoon; Song, Hee Jo; Roh, Hee Suk; Kim, Dong-Wan; Hong, Kug Sun.

In: Materials Chemistry and Physics, Vol. 139, No. 2-3, 15.05.2013, p. 350-354.

Research output: Contribution to journalArticle

Hur, Seyoon ; Song, Hee Jo ; Roh, Hee Suk ; Kim, Dong-Wan ; Hong, Kug Sun. / A novel green-emitting Ca15(PO4)2(SiO 4)6 : Eu2+ phosphor for applications in n-UV based w-LEDs. In: Materials Chemistry and Physics. 2013 ; Vol. 139, No. 2-3. pp. 350-354.
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