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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 24 — Nov. 22, 2010
  • pp: 25177–25182

Enriching red emission of Y3Al5O12: Ce3+ by codoping Pr3+ and Cr3+ for improving color rendering of white LEDs

Lei Wang, Xia Zhang, Zhendong Hao, Yongshi Luo, Xiao-jun Wang, and Jiahua Zhang  »View Author Affiliations

Optics Express, Vol. 18, Issue 24, pp. 25177-25182 (2010)

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Triply doped Y3Al5O12: Ce3+, Pr3+, Cr3+ phosphors are prepared by solid state reaction. The emission spectra are enriched in the red region with the luminescence of both Pr3+ and Cr3+ through Ce3+→Cr3+ and Ce3+→Pr3+→Cr3+ energy transfers. The properties of photoluminescence and fluorescence decay indicates larger macroscopic Ce3+→Cr3+ transfer rates in the triply doped phosphors in comparison to Ce3+ and Cr3+ doubly doped one, reflecting the effect of competition between Ce3+→Cr3+ and Ce3+→Pr3+ transfers. White LEDs fabricated using the triply doped phosphor coated on blue LED chips show a color rendering index of 81.4 higher than that either using Ce3+ and Cr3+ doubly doped or Ce3+ singly doped phosphor.

© 2010 OSA

OCIS Codes
(160.5690) Materials : Rare-earth-doped materials
(230.3670) Optical devices : Light-emitting diodes
(250.5230) Optoelectronics : Photoluminescence
(260.2160) Physical optics : Energy transfer

ToC Category:
Optical Devices

Original Manuscript: September 8, 2010
Revised Manuscript: October 24, 2010
Manuscript Accepted: October 28, 2010
Published: November 17, 2010

Lei Wang, Xia Zhang, Zhendong Hao, Yongshi Luo, Xiao-jun Wang, and Jiahua Zhang, "Enriching red emission of Y3Al5O12: Ce3+ by codoping Pr3+ and Cr3+ for improving color rendering of white LEDs," Opt. Express 18, 25177-25182 (2010)

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