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Journal of Applied Physics / Volume 111 / Issue 1 / ARTICLES / Lasers, Optics, and Optoelectronics

J. Appl. Phys. 111, 013101 (2012); http://dx.doi.org/10.1063/1.3673331 (7 pages)

Luminescent properties of LiBaPO4:RE (RE = Eu2+, Tb3+, Sm3+) phosphors for white light-emitting diodes

Jiayue Sun1, Xiangyan Zhang1, Zhiguo Xia2, and Haiyan Du1

1School of Science, Beijing Technology and Business University, Beijing, 100048, China
2School of Materials Sciences and Technology, China University of Geosciences, Beijing, 100083, China

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(Received 19 September 2011; accepted 21 November 2011; published online 4 January 2012)

Multicolor emitting phosphors LiBaPO4:RE (RE = Eu2+, Tb3+, Sm3+) reported as interesting down-conversion luminescent materials in white light-emitting diodes (w-LEDs) have been prepared by a conventional solid-state reaction. The excitation and emission spectra indicate that these phosphors can be effectively excited by the near-UV light, and emit blue, green, and red light, respectively. The photoluminescence properties, decay times, and Commission Internationale de I’Eclairage (CIE) chromaticity indexes are determined for various concentrations of the activators Eu2+, Tb3+, and Sm3+ in LiBaPO4 host. Furthermore, the temperature-dependent luminescence of these phosphors was investigated. The emission intensities of Tb3+- and Sm3+-doped LiBaPO4 increased unexpectedly with increasing temperature. This interesting phenomenon is proposed to be the result of two ground states in the configurational coordination diagram. The present investigation suggests that LiBaPO4:RE (RE = Eu2+, Tb3+, Sm3+) were potential candidates for application in w-LEDs.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL
  3. RESULTS AND DISCUSSION
  4. CONCLUSION

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KEYWORDS and PACS

Keywords

barium compounds, europium, ground states, light emitting diodes, lithium compounds, phosphors, photoluminescence, samarium, terbium, ultraviolet spectra

PACS

  • 78.55.Hx

    Other solid inorganic materials

  • 78.40.Ha

    Other nonmetallic inorganics

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3673331

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    J. K. Park, C. H. Kim, S. H. Park, H. D. Park, and S. Y. Choi, Appl. Phys. Lett.84, 1647 (2004)APPLAB000084000010001647000001.

    R. J. Xie, N. Hirosaki, N. Kimura, K. Sakuma, and M. Mitomo, Appl. Phys. Lett. 90, 191101 (2007)APPLAB000090000019191101000001.


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