National Laboratory of Solid State Microstructures, School of Physics & College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093 (China).
New and Renewable Energy of Beijing Key Laboratory, School of Renewable Energy, North China Electric Power University, Beijing 102206 (China).
Angew Chem Int Ed Engl. 2015 May 18;54(21):6222-6. doi: 10.1002/anie.201501396. Epub 2015 Apr 2.
By creating two triplet excitons from one photo-excited singlet exciton, singlet fission in organic semiconductors has drawn tremendous attention for its potential applications in boosting the efficiency of solar conversion. Here, we show that this carrier-multiplication effect can also be used to dramatically improve the nonlinear optical response in organic materials. We have observed large optical nonlinearity with a magnitude of χ((3)) up to 10(-9) esu in pentacene films, which is further shown to be a result of singlet fission by monitoring the temporal dynamics. The potential application of such efficient nonlinear optical response has been demonstrated with a singlet-fission-induced polarization rotation.
通过从一个单激发子中产生两个三重激子，有机半导体中的单态裂变因其在提高太阳能转换效率方面的潜在应用而引起了极大的关注。在这里，我们表明这种载流子倍增效应也可用于显著改善有机材料的非线性光学响应。我们已经在并五苯薄膜中观察到高达 10(-9) esu 的 χ((3)) 的大光学非线性，通过监测时间动力学进一步表明这是单态裂变的结果。通过单态裂变诱导的极化旋转证明了这种高效非线性光学响应的潜在应用。
