期刊
JOURNAL OF LUMINESCENCE
卷 135, 期 -, 页码 20-25出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2012.10.023
关键词
Optical materials; Energy transfer; Luminescence
类别
资金
- National Natural Science Foundations of China [51002146, 41172053, 51272242]
- Ph.D. Programs Foundation of Ministry of Education of China [20090022120002]
- Fundamental Research Funds for the Central Universities [2010ZY35, 2011YYL131]
- Funds of the State key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences [RERU2011014]
A series of color-tunable blue-green emitting Na2Ca4(PO4)(3)F:Eu2+,Tb3+ phosphors were prepared by a high temperature solid-state reaction. Their luminescence properties reveal that there is an efficient energy transfer from Eu2+ to Tb3+ ions via a dipole-quadrupole mechanism where Eu2+ ions exhibit a strong excitation band in near ultraviolet (UV) region, matching well with the dominant emission band of near UV (350-420 nm) LED chips, and Eu2+ and Tb3+ ions can give characteristic blue and green emission light. The varied color of the phosphors from blue to green can be achieved by properly tuning the relative ratio of Eu2+ to Tb3+ dopant through the energy transfer from Eu2+ to Tb3+ ions. Thermal quenching luminescence results reveal that Na2Ca4(PO4)(3)F:Eu2+,Tb3+ exhibits good thermal stability. These results demonstrate that Tb3+ ion with low 4f-4f absorption efficiency in near UV region can play the role of an activator in narrow green-emitting phosphor through efficient energy feeding by allowing 4f-5d absorption of Eu2+ with high oscillator strength. The present Eu2+-Tb3+ codoped Na2Ca4(PO4)(3)F phosphor will have potential application for the near UV white LEDs. (C) 2012 Elsevier B.V. All rights reserved.
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