Title: Synthesis and Luminescence Properties of Novel Ce3+- and Eu2+-Doped Lanthanum Bromothiosilicate La3Br(SiS4)(2) Phosphors for White LEDs
Authors: Lee, Szu-Ping
Liu, Shuang-De
Chan, Ting-Shan
Chen, Teng-Ming
Department of Applied Chemistry
Institute of Molecular science
Keywords: thiosilicate phosphor;rare-earth activator;luminescence;light emitting diodes;solid-state lighting
Issue Date: 13-Apr-2016
Abstract: Novel Ce3+- and Eu2+-doped lanthanum bromothiosilicate La3Br(SiS4)(2):Ce3+ and La3Br(SiS4)(2):Eu2+ phosphors were prepared by solid-state reaction in an evacuated and sealed quartz glass ampule. The La3Br(SiS4)(2):Ce3+ phosphor generates a cyan emission upon excitation at 375 nm, whereas the La3Br(SiS4)(2):Eu2+ phosphor could be excited with extremely broad range from UV to blue region (300 to 600 nm) and generates a reddish-orange broadband emission centered at 640 nm. In addition, thermal luminescence properties of La3Br(SiS4)(2):Ce3+ and La3Br(SiS4)(2):Eu2+ phosphors from 20 to 200 degrees C were investigated. The combination of a 450 nm blue InGaN-based LED chip with the red-emitting La3Br(SiS4)(2):Eu2+ phosphor, and green-emitting BOSE:Eu2+ commercial phosphor produced a warm-white light with the CRI value of similar to 95 and the CCT of 5,120 K. Overall, these results show that the prepared phosphors may have potential applications in pc-WLED.
URI: http://dx.doi.org/10.1021/acsami.5b12125
ISSN: 1944-8244
DOI: 10.1021/acsami.5b12125
Volume: 8
Issue: 14
Begin Page: 9218
End Page: 9223
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