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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 6 — Mar. 12, 2012
  • pp: 6248–6257

Bredigite-structure orthosilicate phosphor as a green component for white LED: the structural and optical properties

Kyoung Hwa Lee, Seung Hyok Park, Ho Shin Yoon, Yong-Il Kim, Ho Gyeom Jang, and Won Bin Im  »View Author Affiliations


Optics Express, Vol. 20, Issue 6, pp. 6248-6257 (2012)
http://dx.doi.org/10.1364/OE.20.006248


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Abstract

A green-emitting phosphor, Ca14–xEuxMg2[SiO4]8 (CMS:Eu2+), has been synthesized as a component of white light emitting diodes (WLEDs). The emission spectrum is broad, with a maximum at about 505 nm under 400 nm excitation due to the transition from the 4f65d excited state to the 4f7-ground state of a Eu2+ ion. The dipole-dipole interaction was a dominant energy transfer mechanism of the electric multipolar character of CMS:Eu2+. The critical distance was calculated as 12.9 Å and 14.9 Å using a critical concentration of Eu2+ and Dexter’s theory for energy transfer. When CMS:Eu2+ and red phosphor are incorporated with an encapsulant on an ultraviolet (λmax = 395 nm) light emitting diodes (LEDs), white light with a color rendering index of 91 under a forward bias current of 20 mA was obtained. The structural and optical characterization of the phosphor is described.

© 2012 OSA

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(230.3670) Optical devices : Light-emitting diodes
(250.5230) Optoelectronics : Photoluminescence

ToC Category:
Optical Devices

History
Original Manuscript: January 17, 2012
Revised Manuscript: February 18, 2012
Manuscript Accepted: February 20, 2012
Published: March 2, 2012

Citation
Kyoung Hwa Lee, Seung Hyok Park, Ho Shin Yoon, Yong-Il Kim, Ho Gyeom Jang, and Won Bin Im, "Bredigite-structure orthosilicate phosphor as a green component for white LED: the structural and optical properties," Opt. Express 20, 6248-6257 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-6-6248


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