Four-photon upconversion induced by infrared diode laser excitation in rare-earth-ion-doped Y2O3 nanocrystals

被引：52
作者：
Chen, G. Y.
Liu, Y.
Zhang, Z. G. [1 ]
Aghahadi, B.
Somesfalean, G.
Sun, Q.
Wang, F. P.
机构：
[1] Harbin Inst Technol, Dept Phys, Harbin 150001, Peoples R China
[2] Harbin Inst Technol, Dept Appl Chem, Harbin 150001, Peoples R China
来源：
CHEMICAL PHYSICS LETTERS | 2007年 / 448卷 / 1-3期
关键词：
D O I：
10.1016/j.cplett.2007.09.078
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Room-temperature blue and violet upconversion (UC) emissions of Er3+ at 409 nm (H-2(9/2) -> I-4(15/2)) and 390 nm ((4)G(11/2) -> I-4(15/2)) were observed in Y2O3:Yb3+-Er3+ nanocrystals by diode laser excitation of 980 nm. At low Yb3+ concentration both wavelengths result from three-photon UC processes. Unexpectedly, a four-photon and a decreased three-photon UC processes were observed at high Yb3+ concentration for the violet and the blue emissions, respectively. The four-photon process supposably results from the cross relaxation D-4(7/2) + I-4(15/2) -> (4)G(11/2) + I-4(13/2) of Er3+ ions with the D-4(7/2) state populated by the 2(2)F(5/2)(Yb) + F-4(9/2)(Er) -> 2(2)F(7/2)(Yb) + D-4(7/2)(Er) process, whereas the decreased photon process arises from the larger UC rate at high Yb3+ concentration. (c) 2007 Elsevier B.V. All rights reserved.
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页码：127 / 131
页数：5
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