Ratzke Wolfram, Schmitt Lisa, Matsuoka Hideto, Bannwarth Christoph, Retegan Marius, Bange Sebastian, Klemm Philippe, Neese Frank, Grimme Stefan, Schiemann Olav, Lupton John M, Höger Sigurd
Institut für Experimentelle und Angewandte Physik, Universität Regensburg , Universitätsstr. 31, 93040 Regensburg, Germany.
Kekulé-Institut für Organische Chemie und Biochemie, University of Bonn , Gerhard-Domagk-Str. 1, 53121 Bonn, Germany.
J Phys Chem Lett. 2016 Nov 17;7(22):4802-4808. doi: 10.1021/acs.jpclett.6b01907. Epub 2016 Nov 11.
Metal-free dual singlet-triplet organic light-emitting diode (OLED) emitters can provide direct insight into spin statistics, spin correlations and spin relaxation phenomena, through a comparison of fluorescence to phosphorescence intensity. Remarkably, such materials can also function at room temperature, exhibiting phosphorescence lifetimes of several milliseconds. Using electroluminescence, quantum chemistry, and electron paramagnetic resonance spectroscopy, we investigate the effect of the conjugation pathway on radiative and nonradiative relaxation of the triplet state in phenazine-based compounds and demonstrate that the contribution of the phenazine nπ* excited state is crucial to enabling phosphorescence.
无金属双单重态-三重态有机发光二极管（OLED）发光体通过比较荧光与磷光强度，能够直接洞察自旋统计、自旋关联和自旋弛豫现象。值得注意的是，这类材料在室温下也能发挥作用，展现出几毫秒的磷光寿命。我们利用电致发光、量子化学和电子顺磁共振光谱，研究了共轭途径对吩嗪基化合物中三重态辐射和非辐射弛豫的影响，并证明吩嗪nπ*激发态的贡献对于实现磷光至关重要。
