个人信息Personal Information
副教授
硕士生导师
性别:女
毕业院校:Regensburg大学
学位:博士
所在单位:化学学院
学科:分析化学
电子邮箱:guohm@dlut.edu.cn
Organic Triplet Sensitizer Library Derived from a Single Chromophore (BODIPY) with Long-Lived Triplet Excited State for Triplet-Triplet Annihilation Based Upconversion
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论文类型:期刊论文
发表时间:2011-09-02
发表刊物:JOURNAL OF ORGANIC CHEMISTRY
收录刊物:ESI高被引论文、Scopus、SCIE、EI、PubMed
卷号:76
期号:17
页面范围:7056-7064
ISSN号:0022-3263
摘要:Triplet-triplet annihilation (TTA) based upconversions are attractive as a result of their readily tunable excitation/emission wavelength, low excitation power density, and high upconversion quantum yield. For TTA upconversion, triplet sensitizers and acceptors are combined to harvest the irradiation energy and to acquire emission at higher energy through triplet-triplet energy transfer (TTET) and TTA processes. Currently the triplet sensitizers are limited to the phosphorescent transition metal complexes, for which the tuning of UV-vis absorption and T(1) excited state energy level is difficult. Herein for the first time we proposed a library of organic triplet sensitizers based on a single chromophore of boron-dipyrromethene (BODIPY). The organic sensitizers show intense UV-vis absorptions at 510-629 nm (epsilon up to 180,000 M(-1) cm(-1)). Long-lived triplet excited state (tau(T) up to 66.3 mu s) is populated upon excitation of the sensitizers, proved by nanosecond time-resolved transient difference absorption spectra and DFT calculations. With perylene or 1-chloro-9,10-bis(phenylethynyl)anthracene (1CBPEA) as the triplet acceptors, significant upconversion (Phi(UC) up to 6.1%) was observed for solution samples and polymer films, and the anti-Stokes shift was up to 0.56 eV. Our results pave the way for the design of organic triplet sensitizers and their applications in photovoltaics and upconversions, etc.
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