Up-conversion luminescence of crystalline rubrene without any sensitizers

被引:6
|
作者
Liu, Huihui [1 ,2 ]
Yan, Fei [1 ,2 ]
Li, Wenlian [1 ,2 ]
Lee, Chun-Sing [3 ,4 ]
Chu, Bei [1 ,2 ]
Chen, Yiren [1 ,2 ]
Li, Xiao [1 ,2 ]
Han, Liangliang [1 ,2 ]
Su, Zisheng [1 ,2 ]
Zhu, Jianzhuo [1 ,2 ]
Kong, Xianggui [1 ,2 ]
Zhang, Ligong [1 ,2 ]
Luo, Yongshi [1 ,2 ]
机构
[1] Chinese Acad Sci, Key Lab Excited State Proc, Changchun 130033, Peoples R China
[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
[3] City Univ Hong Kong, COSDAF, Hong Kong, Hong Kong, Peoples R China
[4] City Univ Hong Kong, Dept Phys & Mat Sci, Hong Kong, Hong Kong, Peoples R China
基金
中国国家自然科学基金;
关键词
Organic; Up-conversion; Crystallinity; TRIPLET-TRIPLET ANNIHILATION; 2-PHOTON; FLUORESCENCE; ABSORPTION; MORPHOLOGY;
D O I
10.1016/j.orgel.2010.01.018
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Up-conversion luminescence (UCL) in crystalline rubrene samples in absence of any sensitizers under excitation of 980 nm laser was observed. The optimal quasi-single crystal rubrene sample with the highest crystallinity shows the strongest UCL at 610 nm with up-conversion quantum efficiency of 0.19%. The UCL intensity depends on the proportion of orthorhombic crystal phase, particle size, structural defects, and reabsorption of fluorescence in all samples, while amorphous rubrene sample, such as, both polymethylmethacrylate film dispersed with 0.1 wt.% rubrene and 0.5 x 10 (3) M rubrene chloroform solution, do not exhibit UCL. According to the dependence of the integral UCL intensity on the excitation power density of 980 nm laser, a two-photon absorption feature in our UCL system was obtained. The mechanism of UCL process was also discussed in detail. (c) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:946 / 950
页数:5
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