作者:Abhimanyu S. Paraskar、A. Ravikumar Reddy、Asit Patra、Yair H. Wijsboom、Ori Gidron、Linda J. W. Shimon、Gregory Leitus、Michael Bendikov
DOI:10.1002/chem.200800802
日期:——
crystal, rubrene shows very low mobility in vacuum-sublimed or solution-processed organic thin-film transistors. We synthesized several rubrene analogues with electron-withdrawing and electron-donating substituents and found that most of the substituted rubrenes are not planar in the solid state. Moreover, we conclude (based on experimental and calculated data) that even parent rubrene is not planar in solution
efficiency of photon upconversion (UC) from nearinfrared (NIR) to visible emission by the triplet–triplet annihilation (TTA) mechanism in solids has been limited in spite of its importance. The singlet fission (SF) quenching of the fluorescence of rubrene, widely used annihilator and emitter, and back energy transfer (BET) from the emitter to sensitizer can be major reasons interfering with NIR TTA-UC