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Energy Express

  • Editor: Bernard Kippelen
  • Vol. 19, Iss. S3 — May. 9, 2011
  • pp: A331–A339

Eu2+-activated silicon-oxynitride Ca3Si2O4N2: a green-emitting phosphor for white LEDs

Yi-Chen Chiu, Chien-Hao Huang, Te-Ju Lee, Wei-Ren Liu, Yao-Tsung Yeh, Shyue-Ming Jang, and Ru-Shi Liu  »View Author Affiliations

Optics Express, Vol. 19, Issue S3, pp. A331-A339 (2011)

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The green-emitting phosphor Ca3Si2O4N2:Eu2+ was synthesized using a solid-state reaction. The luminescence properties, diffuse reflection spectrum, and thermal quenching were firstly studied, and a white light-emitting diode (wLED) was fabricated using the Eu2+-activated Ca3Si2O4N2 phosphor. Eu2+-doped Ca3Si2O4N2 exhibited a broad green emission band centered between 510 and 550 nm depending on the concentration of Eu2+. The optimal doping concentration of Eu2+ in Ca3Si2O4N2 was 1 mol%. The energy transfer between Eu2+ ions proceeds by an electric multipolar interaction mechanism, with a critical transfer distance of approximately 30.08 Å. A wLED with an color-rendering index Ra of 88.25 at a correlated color temperature of 6029 K was obtained by combining a GaN-based n-UV LED (380 nm) with the blue-emitting BaMgAl10O17:Eu2+, green-emitting Ca3Si2O4N2:Eu2+, and red-emitting CaAlSiN3:Eu2+ phosphors. The results present Ca3Si2O4N2:Eu2+ as an attractive candidate for use as a conversion phosphor for wLED applications.

© 2011 OSA

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(250.5230) Optoelectronics : Photoluminescence
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence

ToC Category:
Fluorescent and Luminescent Materials

Original Manuscript: March 31, 2011
Revised Manuscript: April 27, 2011
Manuscript Accepted: April 27, 2011
Published: April 28, 2011

Yi-Chen Chiu, Chien-Hao Huang, Te-Ju Lee, Wei-Ren Liu, Yao-Tsung Yeh, Shyue-Ming Jang, and Ru-Shi Liu, "Eu2+-activated silicon-oxynitride Ca3Si2O4N2: a green-emitting phosphor for white LEDs," Opt. Express 19, A331-A339 (2011)

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