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Volume-conserved Twist Excited-state of π-Conjugated Molecules
孙钦超,刘建勇*,郝艳,杨希川
Author NameAffiliationE-mail
孙钦超 State Key Lab of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China  
刘建勇* State Key Lab of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China beam@dicp.ac.cn 
郝艳 State Key Lab of Fine Chemicals, Dalian University of Technology, Dalian 116012, China  
杨希川 State Key Lab of Fine Chemicals, Dalian University of Technology, Dalian 116012, China  
Abstract:
The excited state characters of HY103 have been studied by means of time-resolved photon emission (time-correlated single photon counting) and time dependent density functional theory calculations. The experimental and theoretical results demonstrate that HY103 dyes undergo an efficient one-bond-flip motion after photoexicitation at room temperature, which leads to a very short lifetime of the normal fluorescence state, and a weak fluorescence emission around 670 nm. However, when HY103 are excited in amorphous glasses at 77 K, the normal fluorescence emission is prolonged to nanoseconds time scale about 2 ns, and the fluorescence emission is enhanced. Furthermore, a new emission state is produced, which is characterized as a volume-conserved twisted (VCT) state. This is the first observation of a VCT state. The experiment indicates that the VCT motion of excited state of ?-conjugated molecules in restricted environment can form a stable emission state, and the excited state character of ?-conjugated molecules in restricted environment is complex.
Key words:  Volume-conserved twisted state, Time-resolved photon emission, Photoisomer-ization
FundProject:
碳碳双键共轭分子在玻璃态形成一个新的体积保守的扭转辐射态
Qin-chao Sun,Jian-yong Liu*,Yan Hao,Xi-chuan Yang
摘要:
采用时间分辨的单光子计数技术和TDDFT计算方法研究了激发态HY103分子的特性. 在室温下溶液中HY103分子被光激发后会发生光诱导的沿双键旋转的异构化,导致了HY103分子非常短的荧光辐射寿命和较弱的荧光辐射强度. 当HY103分子在77 K的玻璃态被光激发后,HY103分子的正常荧光辐射寿命被延长至2 ns左右,而且荧光辐射的强度也得到增强. 此外还观察到了一个新的辐射态和具有的性质. 这不仅能够诱导碳碳双键的共轭分子在空间束缚的环境中发生光致异构化,也可以形成一个新的稳定的辐射态.
关键词:  体积保守的扭转态,时间分辨的荧光辐射,光致异构化
DOI:10.1088/1674-0068/23/06/637-642
分类号: