TY - JOUR
T1 - Enhancement of upconversion luminescence of Y2O 3:Er3+ nanocrystals by codoping Li+-Zn 2+
AU - Liang, Huijuan
AU - Zheng, Yangdong
AU - Chen, Guanying
AU - Wu, Li
AU - Zhang, Zhiguo
AU - Cao, Wenwu
N1 - Funding Information:
The work is supported by the SIDA Asian-Swedish Research Partnership Program, the 863 Hi-Tech Research and Development Program of People's Republic of China, the Harbin City Bureau of Science and Technology Key project fund (2009AA3BS131) and the Harbin Institute of Technology through Programs for Interdisciplinary Basic Research on Science, Engineering and Medicine.
Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/1/12
Y1 - 2011/1/12
N2 - The upconversion (UC) luminescence in sol-gel synthesized Li+, Zn2+, or Li+-Zn2+ codoped Y2O 3:Er3+ nanocrystals were investigated under the excitation of a 970 nm diode laser. Compared to undoped Y2O3:Er 3+ samples, proper doping of Li+-Zn2+ leads to an drastic increase of the UC luminescence centered at 560 nm by a factor of 28. The UC luminescence enhancement is a result of the increased lifetime of the intermediate state 4I11/2 (Er). The intensity ratio of the green over red emissions (green/red) is also affected by the codoping of Zn2+, Li+ and Li+-Zn2+ ions. Our results demonstrated that the Li+-Zn2+ codoping in Y 2O3:Er3+ phosphors produced remarkable enhancement of the UC luminescence and green/red ratio, making this nanocrystal a promising candidate for photonic and biological applications.
AB - The upconversion (UC) luminescence in sol-gel synthesized Li+, Zn2+, or Li+-Zn2+ codoped Y2O 3:Er3+ nanocrystals were investigated under the excitation of a 970 nm diode laser. Compared to undoped Y2O3:Er 3+ samples, proper doping of Li+-Zn2+ leads to an drastic increase of the UC luminescence centered at 560 nm by a factor of 28. The UC luminescence enhancement is a result of the increased lifetime of the intermediate state 4I11/2 (Er). The intensity ratio of the green over red emissions (green/red) is also affected by the codoping of Zn2+, Li+ and Li+-Zn2+ ions. Our results demonstrated that the Li+-Zn2+ codoping in Y 2O3:Er3+ phosphors produced remarkable enhancement of the UC luminescence and green/red ratio, making this nanocrystal a promising candidate for photonic and biological applications.
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U2 - 10.1016/j.jallcom.2010.09.044
DO - 10.1016/j.jallcom.2010.09.044
M3 - Article
AN - SCOPUS:78149283132
SN - 0925-8388
VL - 509
SP - 409
EP - 413
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 2
ER -