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.

引用

页数：6

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