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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 3, Iss. 2 — Feb. 1, 2013
  • pp: 229–236

Design, synthesis and characterization of a new apatite phosphor Sr4La2Ca4(PO4)6O2:Ce3+ with long wavelength Ce3+ emission

Ge Zhu, Yurong Shi, Masayoshi Mikami, Yasuo Shimomura, and Yuhua Wang  »View Author Affiliations

Optical Materials Express, Vol. 3, Issue 2, pp. 229-236 (2013)

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A new apatite phosphor Sr4La2Ca4(PO4)6O2:Ce3+ with bright long wavelength emission was synthesized by solid state reaction. The crystal structure and its photoluminescence properties were studied through X-ray diffraction refinement, excitation and emission spectra. Sr4La2Ca4(PO4)6O2:Ce3+ phosphor can be effectively excited by UV light and emit intense green emission band at 506 nm due to the 5d-4f transitions of Ce3+. The concentration quenching as well as thermal quenching properties were also investigated in detail and were compared with the commercial green phosphor (LMS520B). In addition, a white LED lamp was fabricated by combining the optimized green-emitting Sr4La2Ca4(PO4)6O2:Ce3+ and the commercial red phosphor (ZYP630) with a GaN chip (365~370 nm). The Commission International de l'Eclairage (CIE) chromaticity coordinates, correlated color temperature (CCT) and color-rendering index (CRI) were found to be (0.347, 0.340), 4868 K and 84.6, respectively, and the luminous efficacy is measured to be 30.63 lm/W at room temperature with a forward-bias current of 200mA.

© 2013 OSA

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(250.5230) Optoelectronics : Photoluminescence

ToC Category:
Fluorescent and Luminescent Materials

Original Manuscript: December 12, 2012
Revised Manuscript: December 31, 2012
Manuscript Accepted: December 31, 2012
Published: January 11, 2013

Ge Zhu, Yurong Shi, Masayoshi Mikami, Yasuo Shimomura, and Yuhua Wang, "Design, synthesis and characterization of a new apatite phosphor Sr4La2Ca4(PO4)6O2:Ce3+ with long wavelength Ce3+ emission," Opt. Mater. Express 3, 229-236 (2013)

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