期刊
CRYSTENGCOMM
卷 20, 期 14, 页码 1945-1953出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ce02227a
关键词
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资金
- National Key Research and Development Program of China [2016YFB0701003]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2015181]
- Key Research Program of Frontier Sciences, CAS [YZDY-SSW-JSC018]
- National Natural Science Foundation of China [21590794, 21210001, 21521092]
Hexagonal phase (beta-) NaYF4:Yb/Er upconversion (UC) microrods doped with Cu2+ ions were prepared via a facile solvothermal method. Simultaneous phase and shape control of NaYF4:Yb/Er crystals with enhanced upconversion luminescence (UCU was successfully realized by codoping with Cu2+ ions. With an increasing Cu2+ ion concentration in the NaYF4:Yb/Er system, the crystal structure changed from a mixture of alpha- and beta-phases to the pure beta-phase and was converted into highly uniform microrods. As for the Cu2+ ion doped beta-NaYF4:Yb/Er upconversion microrods, the maximum emission occurs with the sample added with 60 mol% Cu2+ ions and the UCL intensities of the green and red emissions were enhanced 37 and 25 times, respectively. Meanwhile, the possible mechanisms for the enhanced UCL of NaYF4:Yb/Er crystals were also discussed in detail. Moreover, the temperature dependent UCL properties of 60 mol% Cu2+ ion doped beta-NaYF4:Yb/Er were studied under 980 nm excitation, which were temperature-sensitive over a wide temperature range from 123 K to 423 K. The change in UCL intensity influenced by temperature was discussed in detail.
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