期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 798, 期 -, 页码 695-699出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.05.272
关键词
WLED; YAG:Ce3+/Mn2+/Si4+; CRI; Ceramics
资金
- International Partnership Program of Chinese Academy of Sciences [181231KYSB20160005]
- National Key R&D Program of China [2017YFB0403700]
Y3Al5O12:Ce3+/Mn2+/Si4+ phosphor ceramics were fabricated by solid state reaction. Red emission is obtained, which is attributed to the Mn2+: T-4(1) -> (6)A(1) spin-forbidden transition under the excitation of 450 nm via the efficient energy transfer from Ce3+ to Mn2+.The green emission (535 nm) originating from Ce3+ and the orange emission (587 nm) from Mn2+ ions were observed. Mn2+ ions are more inclined to occupy Al3+ octahedral sites and the Si4+ ions locate in the Al3+ tetrahedral sites and their codoping is for charge compensation. The red emission component in Ce3+/Mn2+/Si4+ doping YAG phosphor ceramics is significant for obtaining warm white lighting upon increasing Mn2+ concentration under 450 nm excitation. White light emitting diodes were successfully constructed by combining the fabricated ceramics with the GaN blue chips. (C) 2019 Elsevier B.V. All rights reserved.
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