TANG Jing, CHEN Li, XIE Wan-ying, LIU Wei-jie, HUANG Yu-xin, LI Jing, ZHANG Li-gong, LUO Yong-shi. Upconversion Luminescence of NaYF<sub>4</sub>: Yb,Er Nanocrystals Co-doped with 3d<sup>5</sup> Metal Ions[J]. 发光学报, 2016,37(9): 1056-1065
co-doped upconverting nanocrystals were prepared by hydrothermal method. The crystal phase
size and fluorescence intensity were modulated
via
changing the doping concentrations. The maximum intensity of upconversion luminescence (UCL) was observed in current work at the reaction time of 4 h when coating the silica shell of different thickness onto the NaYF
4
:Yb
Er
Fe nanocrystals through facilely altering the reaction time. The integrated overall intensity of upconversion luminescence was 3.7 and 4.5 times enhanced by co-doping Mn
2+
and Fe
3+
respectively. In particular
the red emission of NaYF
4
:Yb
Er
Fe nanocrystals was 7 times intensified selectively compared to the green band of Er
3+
. The intensified visible UCL especially the dominant red emission is mainly ascribed to the energy transfer from|
2
F
7/2
4
T
1g
>
(Yb
3+
-Mn
2+
/Fe
3+
dimer) to
4
F
9/2
(Er
3+
) states as well as the distortion of the crystalline field symmetry. The quenching of UCL as increasing dopants is stemming from the exchange interaction between 3d
5
metal ions.
关键词
Keywords
references
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