期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 787, 期 -, 页码 1120-1127出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.02.070
关键词
NaYF4:Yb/Er@ NaYF4:Yb/Tm microcrystals; White-light color; Distinct lifetime; Multicolor emission
资金
- Natural Science Foundation of Tianjin, key project [17JCZDJC37800]
- Nature Science Foundation of China [11674183, 11811530075]
- 111 Project [B07013]
- Shandong Provincial Natural Science Foundation, China [ZR2017BA013]
Intense white-light color emission of lanthanide-doped core-shell structured particles at microscale level was presented under 980 nm excitation. The prepared NaYF4:Yb/Er@ NaYF4:Yb/Tm microcrystals not only can effectively prevent the deleterious cross-relaxation that occurs between the Er3+ and Tm3+ due to the location of the activator ions within different layers, but also possess a high luminescence efficiency due to dimensions of the micro-scale structure. The core-shell structured microcrystals presented satisfactory capacity for color control in the white region. The results show great potential in attaining white light-emitting diodes within the field emission display on specific device applications. Furthermore, the core-shell microcrystals emit white-light that presents obvious and distinct lifetimes of green, red, and blue emissions, which could achieve multicolor emissions by setting a suitable delay time. This feature demonstrates that the core-shell structured microrods offer practical use as security ink to prevent forgery, such as in identifying currency. (C) 2019 Published by Elsevier B.V.
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