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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 28, Number 8
BKCSDE 28(8)
August 20, 2007

Title	Preparation, Characterization and Photoluminescence Properties of Ca_1-xSr_xS:Eu Red-emitting Phosphors for a White LED
Author	Hye-Jin Sung, Young-Sik Cho, Young-Duk Huh*, Young Rag Do
Keywords	Ca_1-xSr_xS:Eu phosphor, Three-band white LED, Photoluminescence
Abstract	A series of Ca_1-xSr_xS:Eu (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) phosphors were synthesized by solid-state reactions. The Ca_1-xSr_xS:Eu phosphors have a strong absorption at 455 nm, which corresponds to the emission wavelength of a blue LED. The emission peak of Ca_1-xSr_xS:Eu is blue shifted from 655 to 618 nm with increasing Sr content. The characteristics of Ca_1-xSr_xS:Eu phosphors make them suitable for use as wavelengthtunable red-emitting phosphors for three-band white LEDs pumped by a blue LED. In support of this, we fabricated a three-band white LED by coating SrGa₂S₄:Eu and Ca_0.6Sr_0.4S:Eu phosphors onto a blue LED chip, and characterized its optical properties.
Page	1280 - 1284
Full Text	PDF

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