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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 8 — Apr. 12, 2010
  • pp: 8187–8192

High color rendering white light-emitting-diode illuminator using the red-emitting Eu2+-activated CaZnOS phosphors excited by blue LED

Te-Wen Kuo, Wei-Ren Liu, and Teng-Ming Chen  »View Author Affiliations

Optics Express, Vol. 18, Issue 8, pp. 8187-8192 (2010)

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A red phosphor CaZnOS:Eu2+ was synthesized by solid state reaction and has been evaluated as a candidate for white LEDs. For this material, the XRD, PL, PL excitation (PLE) and diffuse reflection spectra have also been investigated. CaZnOS:Eu2+ reveals a broad absorption band and good color purity. By utilizing a mixture of red-emitting CaZnOS:Eu2+, green-emitting (Ba,Sr)2SiO4:Eu2+ and yellow-emitting Y3Al5O12:Ce3+ as light converters, an intense white InGaN-based blue-LED (~460 nm) was fabricated to exhibit a high color-rendering index Ra of 85 at a correlated color temperature of 4870 K. Based on the results, we are currently evaluating the potential application of CaZnOS:Eu2+ as a red-emitting blue-chip convertible phosphor.

© 2010 OSA

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

ToC Category:

Original Manuscript: February 4, 2010
Revised Manuscript: March 30, 2010
Manuscript Accepted: April 1, 2010
Published: April 2, 2010

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

Te-Wen Kuo, Wei-Ren Liu, and Teng-Ming Chen, "High color rendering white light-emitting-diode illuminator using the red-emitting Eu2+-activated CaZnOS phosphors excited by blue LED," Opt. Express 18, 8187-8192 (2010)

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