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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 5 — Mar. 1, 2010
  • pp: 5089–5099

Ca9La(PO4)7:Eu2+,Mn2+: an emission-tunable phosphor through efficient energy transfer for white light-emitting diodes

Chien-Hao Huang and Teng-Ming Chen  »View Author Affiliations

Optics Express, Vol. 18, Issue 5, pp. 5089-5099 (2010)

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We have synthesized a series of single-composition emission-tunable Ca9La(PO4)7:Eu2+,Mn2+ (CLP:Eu2+,Mn2+) phosphors by solid state reactions. Through an effective resonance-type energy transfer, the CLP:Eu2+,Mn2+ phosphors exhibit a systematically varied hues from green, yellow, and eventually to red and the relative intensity of green and red emissions can be tuned by adjusting the concentration of Mn2+, respectively. The energy transfer from Eu2+ to Mn2+ in CLP:Eu2+,Mn2+ has been studied and demonstrated to be a resonant type via a dipole-quadrupole mechanism based on the decay lifetime data and the energy transfer critical distance was estimated to be 11.36 Å by using the spectral overlap methods. A warm white light emitting diode (WLED) with CIE chromaticity coordinates of (0.35, 0.31), superior color-rendering index (Ra) of 91.5 and lower correlated color temperature (CCT) of 4,496 K was fabricated by combining a 365 nm UV-InGaN chip and a phosphor blend of yellow-emitting (Ca0.98Eu0.005Mn0.015)9La(PO4)7 and blue-emitting BaMgAl10O17:Eu2+.

© 2010 OSA

OCIS Codes
(000.2700) General : General science

ToC Category:
Optical Devices

Original Manuscript: October 26, 2009
Revised Manuscript: January 16, 2010
Manuscript Accepted: January 18, 2010
Published: February 25, 2010

Virtual Issues
Focus Issue: Solar Concentrators (2010) Optics Express

Chien-Hao Huang and Teng-Ming Chen, "Ca9La(PO4)7:Eu2+,Mn2+: an emission-tunable phosphor through efficient energy transfer for white light-emitting diodes," Opt. Express 18, 5089-5099 (2010)

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