Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 142, Issue 1, Pages 333-338Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2013.07.025
Keywords
Optical materials; Sol-gel growth; Photoluminescence spectroscopy; Optical properties
Categories
Funding
- National Natural Science Foundation of China [11004021, 11274057]
- 973 Program [2012CB626801]
- Scientific and Technology Foundation of Dalian [2011J21DW021]
- Fundamental Research Funds for the Central Universities [DC12010208, DC120101173]
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2 mol% Tm3+ doped NaYF4 phosphors with 0-98 mol% Yb3+ codoping were synthesized by sal-gel method. The phase transition from the mixture of hexagonal and cubic phases to single cubic phase of Tm3+ - Yb3+:NaYF4 phosphors was investigated with increasing of Yb3+ concentration. Near-infrared, red, blue, violet and ultraviolet upconversion emissions of Tm3+ were observed from the Tm3+ - Yb3+:NaYF4 phosphors under 976 nm laser diode excitation, with the strongest near-infrared to ultraviolet emissions at 20 mol% Yb3+ codoping. The violet and blue emissions for the D-1(2) -> F-3(4) and (1)G(4) -> H-3(6) transitions of Tm3+ can be tuned by varying Yb3+ codoping concentration, which was elucidated using steady-state equations. The intensity ratio of red emissions for the F-3(2) -> H-3(6) and F-3(3) -> H-3(6) transitions of Tm3+ was strongly related to the Yb3+ codoping concentration and temperature, implying a potential application of Tm3+ -> Yb3+:NaYE4 phosphors for optical temperature sensing. (C) 2013 Elsevier B.V. All rights reserved.
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