Affordable Access

Yellow phosphors coated with TiO2for the enhancement of photoluminescence and thermal stability

Authors
Journal
Applied Surface Science
0169-4332
Publisher
Elsevier
Publication Date
Volume
257
Issue
20
Identifiers
DOI: 10.1016/j.apsusc.2011.03.137
Keywords
  • Phosphor
  • Tio2 Coating
  • Thermal Stability
  • Surface Modification

Abstract

Abstract In order to improve the phosphor efficiency of yellow emission of the phosphor-converted white light emitting diode (pcW-LED), the Ba 2+ Mg 2+ co-doped Sr 2SiO 4:Eu phosphors were synthesized and were coated with thin and uniform TiO 2. The TiO 2 layer with 20 nm was uniformly coated over the phosphor surface. The photoluminescence (PL) properties of the TiO 2-coated phosphors showed improved yellow-emission intensity compared to the pristine phosphors. The temperature dependence of photoluminescence was measured from 25 to 150 °C. The TiO 2-coated phosphors showed superior thermal quenching property compared to pristine phosphors. We concluded that the TiO 2-coated surface of the phosphor is an effective way to improve the phosphor efficiency and enhance the thermal quenching stability.

There are no comments yet on this publication. Be the first to share your thoughts.