TY - JOUR
T1 - Up-conversion luminescence of crystalline rubrene without any sensitizers
AU - Liu, Huihui
AU - Yan, Fei
AU - Li, Wenlian
AU - Lee, Chun-Sing
AU - Chu, Bei
AU - Chen, Yiren
AU - Li, Xiao
AU - Han, Liangliang
AU - Su, Zisheng
AU - Zhu, Jianzhuo
AU - Kong, Xianggui
AU - Zhang, Ligong
AU - Luo, Yongshi
PY - 2010/5
Y1 - 2010/5
N2 - 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 × 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. © 2010 Elsevier B.V. All rights reserved.
AB - 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 × 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. © 2010 Elsevier B.V. All rights reserved.
KW - Crystallinity
KW - Organic
KW - Up-conversion
UR - http://www.scopus.com/inward/record.url?scp=77950594173&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-77950594173&origin=recordpage
U2 - 10.1016/j.orgel.2010.01.018
DO - 10.1016/j.orgel.2010.01.018
M3 - RGC 21 - Publication in refereed journal
SN - 1566-1199
VL - 11
SP - 946
EP - 950
JO - Organic Electronics: physics, materials, applications
JF - Organic Electronics: physics, materials, applications
IS - 5
ER -