Effect of Zn2+ Ions on Upconversion Emission of Er3+ in Zn/Er:LiNbO3 Crystal

Chemical Research in Chinese Universities ›› 2012, Vol. 28 ›› Issue (2): 295-298 .

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Effect of Zn²⁺ Ions on Upconversion Emission of Er³⁺ in Zn/Er:LiNbO₃ Crystal

QIAN Yan-nan, WANG Rui, XING Li-li, XU Yan-ling, YANG Chun-hui

Department of Chemistry, Harbin Institute of Technology, Harbin 150001, P. R. China

Received:2011-04-18 Revised:2011-07-05 Online:2012-03-25 Published:2012-03-08
Supported by:
Supported by the National Natural Science Foundation of China(No.10732100) and the Natural Science Foundation of Hei-longjiang Province of China(No.B200903).

Abstract

Abstract: The effect of Zn²⁺ ions codoped on the upconversion emission of Er³⁺ ions in Er:LiNbO₃ crystal under different excitation wavelength was reported. The upconversion emission spectra of Zn/Er:LiNbO₃ following 800 nm excitation reveal an enhanced green emission and a suppressed red emission simultaneously. The cross relaxation processes(²H_11/2+⁴I_13/2→⁴I_11/2+⁴F_9/2 and ⁴F_7/2+⁴I_11/2→⁴F_9/2+⁴F_9/2) are responsible for populating the red ⁴F_9/2 emitting state. The dissociation effect of Zn²⁺ ions on the Er³⁺ cluster sites makes these cross relaxation processes inefficient. Under 980 nm excitation, the Zn²⁺ codoped leads to the decreased intensities of green and red upconversion emissions. These reductions are attributed to the inefficient cross relaxation processes(⁴I_11/2+⁴I_11/2→⁴F_7/2+⁴I_15/2 and ⁴F_7/2+⁴I_11/2→⁴F_9/2+⁴F_9/2) caused by the same dissociation effect of Zn²⁺ ions.

Key words: Upconversion, Zn²⁺, Zn/Er：LiNbO₃

QIAN Yan-nan, WANG Rui, XING Li-li, XU Yan-ling, YANG Chun-hui. Effect of Zn²⁺ Ions on Upconversion Emission of Er³⁺ in Zn/Er:LiNbO₃ Crystal[J]. Chemical Research in Chinese Universities, 2012, 28(2): 295-298 .

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Effect of Zn²⁺ Ions on Upconversion Emission of Er³⁺ in Zn/Er:LiNbO₃ Crystal

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