Open AccessThe new red-emitting phosphor of oxyfluoride Ca_2RF_4PO_4:Eu^3+ (R=Gd, Y) for solid state lighting applications
Author(s) -
Yanlin Huang,
Yosuke Nakai,
Taijū Tsuboi,
Hyo Jin Seo
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.006303
Subject(s) - phosphor , luminescence , materials science , light emitting diode , excited state , quantum efficiency , solid state lighting , excitation , optoelectronics , color temperature , analytical chemistry (journal) , optics , atomic physics , chemistry , physics , quantum mechanics , chromatography
The novel red-emitting phosphors of Eu3+-activated Ca2RF4PO4:Eu3+ (R=Gd, Y) prepared by a solid-state reaction have been evaluated as a candidate for white solid state lighting. The detailed luminescence properties, e.g., the excitation spectra, the luminescence spectra and quantum efficiency under the excitation of near-UV, and decay lifetimes were reported. The phosphors can be efficiently excited by near UV light and exhibit a dominant emission peaked at 611 nm (5D0-7F2) with CIE coordinates of (x=0.661, y=0.333). The thermal stabilities were investigated from the luminescence intensities, color purity and the decay curves by increasing temperature. The luminescence parameters related to white LEDs applications were compared to some red phosphors and discussed in details. The red-emitting Ca2RF4PO4:Eu3+ (R=Gd, Y) may be potentially useful in the fabrication of white LEDs.