121st General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code MAT.P-330
Subject Tuning of the Photoluminescence Wavelengths of Eu2+-activated Thiogallate Phosphors
Authors Hye Jin Park, Young-Sik Cho1, min kyeong Jang, Young-Duk Huh1,*
Chemistry, Dankook University, Korea
1Department of Chemistry, Dankook University, Korea
Abstract Eu2+-activated MGa2S4 (M = Ca, Sr, Eu) phosphors were synthesized from MS, EuS, and Ga2S3 by carrying out solid-state reactions. The photoluminescence (PL) spectra of these phosphors under excitation at 465 nm, which was the emission wavelength of the commercial blue light emitting diode (blue LED), were examined to assess their applicability in phosphor converted light emitting diodes (pc-LEDs). The wavelength at maximum intensity of the PL spectra of the phosphors changed gradually from 559 to 545 nm, as europium ion mole fraction (x) was increased in (Ca1-xEux)Ga2S4 phosphors. For (Sr1-xEux)Ga2S4 phosphors, the wavelength at maximum intensity changed gradually from 534 to 545 nm with the europium ion mole fraction (x) in (Sr1-xEux)Ga2S4 phosphors. This wavelength changes with the value of europium ion mole fraction (x) in Eu2+-activated thiogallate phosphors was interpreted from crystal structures of these phosphors.
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