TY - JOUR
T1 - Tunable upconversion emission in Ba2YF7:Yb 3+/Er3+ nanocrystals with different Yb3+ concentration
AU - Chuai, Xiaohong
AU - Yin, Feixiang
AU - Liu, Zhenyu
AU - Shi, Feng
AU - Wang, Jianshuo
AU - Wang, Lili
AU - Zheng, Kezhi
AU - He, Chunfeng
AU - Qin, Weiping
N1 - Funding Information:
This work was supported by the National High Technology Research and Development Program of China (863 Program: 2009AA03Z309 ), the National Natural Science Foundation of China (NNSFC) (grants 10874058 , 51072065 , and 60908031 , 61108023 ), and the basic scientific research item of Jilin University (grant 421033461411 ).
PY - 2013/6
Y1 - 2013/6
N2 - Ba2YF7:xYb3+,0.02Er3+ nanocrystals with different Yb3+ concentration (x = 0.2, 0.4, 0.6, 0.8, 0.98) were synthesized via a solvothermal method. Their X-ray diffraction patterns reveal that all the samples are cubic phase without phase change at arbitrary Yb3+ concentration. Upon excitation of 980 nm laser, these nanocrystals display upconversion emission in the green and red spectral regions. The relative emission intensity at these two regions can be tuned by Yb3+ concentration. To investigate the effect of Yb3+ ion, the decay times of 650 nm emission were measured and analyzed. Ba 2YF7:0.6Yb3+,0.02Er3+ nanocrystals have the longest lifetime and highest emission intensity among all the samples. We concluded the lifetime of 4F9/2 level has an effect on its own population and intensity ratio of red and green emission. Our results show Yb3+ ion can tune the upconversion emission and improve upconverison emission intensity.
AB - Ba2YF7:xYb3+,0.02Er3+ nanocrystals with different Yb3+ concentration (x = 0.2, 0.4, 0.6, 0.8, 0.98) were synthesized via a solvothermal method. Their X-ray diffraction patterns reveal that all the samples are cubic phase without phase change at arbitrary Yb3+ concentration. Upon excitation of 980 nm laser, these nanocrystals display upconversion emission in the green and red spectral regions. The relative emission intensity at these two regions can be tuned by Yb3+ concentration. To investigate the effect of Yb3+ ion, the decay times of 650 nm emission were measured and analyzed. Ba 2YF7:0.6Yb3+,0.02Er3+ nanocrystals have the longest lifetime and highest emission intensity among all the samples. We concluded the lifetime of 4F9/2 level has an effect on its own population and intensity ratio of red and green emission. Our results show Yb3+ ion can tune the upconversion emission and improve upconverison emission intensity.
KW - A. Fluorides
KW - A. Optical materials
KW - B. Chemical synthesis
KW - D. Luminescence
KW - D. Optical properties
UR - http://www.scopus.com/inward/record.url?scp=84875963363&partnerID=8YFLogxK
U2 - 10.1016/j.materresbull.2013.02.075
DO - 10.1016/j.materresbull.2013.02.075
M3 - Article
AN - SCOPUS:84875963363
VL - 48
SP - 2361
EP - 2364
JO - Materials Research Bulletin
JF - Materials Research Bulletin
SN - 0025-5408
IS - 6
ER -