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, Won Bin Im

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

A green-emitting phosphor, Ca14-xEuxMg2[SiO 4]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 4 f65d excited state to the 4 f7-ground state of a Eu 2+ 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 20mA was obtained. The structural and optical characterization of the phosphor is described.

Original languageEnglish
Pages (from-to)6248-6257
Number of pages10
JournalOptics Express
Volume20
Issue number6
DOIs
Publication statusPublished - 2012 Mar 12

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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