Upconversion emission tuning from green to red in Yb3+/Ho3+-codoped NaYF4 nanocrystals by tridoping with Ce3+ ions

被引：172
作者：
Chen, Guanying [1 ]
Liu, Haichun [1 ]
Somesfalean, Gabriel [1 ]
Liang, Huijuan [1 ]
Zhang, Zhiguo [1 ]
机构：
[1] Harbin Inst Technol, Dept Phys, Harbin 150001, Peoples R China
来源：
NANOTECHNOLOGY | 2009年 / 20卷 / 38期
关键词：
CRYSTAL-FIELD ANALYSIS; RARE-EARTH IONS; IN-VIVO; OPTICAL-SPECTRA; ENERGY-LEVELS; KRAMERS IONS; LUMINESCENCE; Y2O3; TM3+;
D O I：
10.1088/0957-4484/20/38/385704
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Upconversion (UC) emission tuning from green to red in monodisperse NaYF4:Yb3+/Ho3+ nanocrystals was successfully achieved by tridoping with Ce3+ ions under diode laser excitation of 970 nm. It is proposed that two efficient cross-relaxation processes, S-5(2)/F-5(4)(Ho) + F-2(5/2)(Ce) -> F-5(5)(Ho) + F-2(7/2)(Ce) and I-5(6)(Ho) + F-2(5/2)(Ce) -> I-5(7)(Ho) + F-2(7/2)(Ce) between Ho3+ and Ce3+ ions, have been employed to select UC pathways to tune the UC radiation. Theoretical investigations based on steady-state equations demonstrate the proposed UC mechanisms and explain well the observed linear increase of the UC red-to-green intensity ratio with the increment of Ce3+ ion concentrations.
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页数：6
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