期刊
JOURNAL OF LUMINESCENCE
卷 135, 期 -, 页码 128-132出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2012.10.031
关键词
Er3+ doped NaYF4; Yb3+ codoping; Upconversion
类别
资金
- National Natural Science Foundation of China [11004021, 11204024, 11274057]
- 973 Program [2012CB626801]
- China Postdoctoral Science Foundation [2011M500623]
- Scientific and Technology Foundation of Dalian [2011J21DW021]
- Fundamental Research Funds for the Central Universities [DC12010208, DC120101173, DC120101171]
Photoluminescent Er3+-Yb3+:NaYF4 with 2 mol% Er3+ and a wide range of Yb3+ codoping concentration from 0 to 98 mol% were synthesized by sol-gel method. The phase transition from the mixture of hexagonal and cubic phases to single hexagonal phase of Er3+-Yb3+:NaYF4 phosphors was investigated with the increase of Yb3+ concentration. Both green and red emissions of Er3+ were observed from the Er3+-Yb3+:NaYF4 phosphors under 976 nm laser diode (LD) excitation, and gained the strongest emissions intensity at 20 mol% Yb3+ codoped. The green and red emissions of H-2(11/2), S-4(3/2) -> I-4(5/2) and F-4(9/2) -> I-4(15/2) transitions of Er3+ can be tuned by varying the Yb3+ codoping concentration. The intensity ratio of green emissions for H-2(11/2), S-4(3/2) -> I-4(5/2) transitions of Er3+ was related to Yb3+ codoping concentration and temperature, implying a potential application of Er3+-Yb3+:NaYF4 phosphors for optical temperature sensing. The upconversion properties of Er3+-Yb3+:NaYF4 phosphors were explained and discussed by the steady-state equations. (C) 2012 Elsevier B.V. All rights reserved.
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