Table of Contents
ISRN Condensed Matter Physics
Volume 2011, Article ID 392917, 3 pages
http://dx.doi.org/10.5402/2011/392917
Research Article

Rare Earth Doped Alkali Earth Sulfide Phosphors for White-Light LEDs

1Department of Physics, CSR Sarma College, Ongole 523 001, India
2Department of Applied Physics, Faculty of Engineering and Technology, MS University of Baroda, Vadodara 390 001, India
3Department of Physics, VRS & YRN College, Chirala 523 157, India
4Department of Physics, VSR & NVR College, Tenali 522 201, India

Received 26 November 2011; Accepted 25 December 2011

Academic Editors: G. Astakhov and V. Kochereshko

Copyright © 2011 K. Suresh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

CaS:Eu and SrS:Eu phosphors were synthesized by solid-state reaction. The effects of doping concentrations on luminescent properties of phosphors are investigated. The samples are excited using electroluminescent blue light emitting diode (460 nm) to examine them as potential coating phosphors for white-light LEDs. The excitation and emission spectra of these phosphors are broadband which can be viewed as the typical emission of Eu2+ ascribed to the 4f–5d transitions. Because of their broadband absorption in the region 400–630 nm, these phosphors meet the application requirements for blue LED chips. A white-light LED was fabricated through the integration of a 460 nm chip. The results indicate that these phosphors can be considered as candidates for the application in blue LED chip-based white-light LEDs.