Guo-tao XIANG, Xiao-tong LIU, Qing XIA, et al. Upconversion Luminescence Properties of β-NaYF4:Yb3+/Er3+@β-NaYF4:Yb3+[J]. Chinese journal of luminescence, 2020, 41(6): 679-683.
DOI:
Guo-tao XIANG, Xiao-tong LIU, Qing XIA, et al. Upconversion Luminescence Properties of β-NaYF4:Yb3+/Er3+@β-NaYF4:Yb3+[J]. Chinese journal of luminescence, 2020, 41(6): 679-683. DOI: 10.3788/fgxb20204106.0679.
Upconversion Luminescence Properties of β-NaYF4:Yb3+/Er3+@β-NaYF4:Yb3+
a solvothermal process was used to synthesize the β-NaYF
4
:20%Yb
3+
/2%Er
3+
core nanoparticles(NPs) and β-NaYF
4
:20%Yb
3+
/2%Er
3+
@β-NaYF
4
:
x
%Yb
3+
(
x
=0
20
50
70
100) core-shell NPs. The size of the core NPs and core-shell NPs is about 30 nm and 40 nm respectively
implying that the thickness of the layer is 5 nm. After coating a β-NaYF
4
shell without Yb
3+
doping
the upconversion(UC) intensity is increased with a factor of 14 and 25 for green emission and red emission respectively
resulting from the suppression of deexcitation of Yb
3+
ions by the core-shell structure. However
the UC intensity is decreased dramatically with the increasing Yb
3+
ions concentration in the shell
due to the inefficient energy transfer process between the Yb
3+
ions in the shell and the Er
3+
ions in the core caused by the large distance between them. As the β-NaYF
4
shell completely converts to β-NaYbF
4
the UC intensity decreased 98.8% and 99.4% for green and red emission
respectively.
关键词
Keywords
references
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