Efficient exciplex organic light-emitting diodes with a bipolar acceptor

Doping-free tandem white organic light-emitting diodes

“…4, the Bepp 2 based device without Ir(dmppy) 2 (dpp) exhibits a strong blue emission which originates from Bepp 2 [39,40], while the blue emission is totally eliminated in the device with Ir(dmppy) 2 (dpp), in which only the yellow emission originating from Ir(dmppy) 2 (dpp) can be observed [20]. Similarly, the TmPyPB based device without FIrpic exhibits a white emission which originates from the exciplex and electroplex [41][42][43], while the white emission is disappeared in the device with FIrpic, in which only the typical FIrpic emission can be observed [3]. These facts indicate that the energy transfer from the nearby layers to the ultrathin EMLs in both units is very favored, ensuring the high efficiency.…”

Solvatochromism and mechanochromism observed in a triphenylamine derivative

“…Unexpectedly, we found intermolecular CT in TPA-CBH. Intermolecular CT between two different compounds has been reported frequently (Chen et al, 2015;Liu et al, 2015;Barnes et al, 2013) but the CT complexes based on a single donor-acceptor molecule are rarely reported (Jin et al, 2014;Park et al, 2015). To the best of our knowledge, TPA-CBH is the first case in which TPA derivatives exhibit intermolecular CT based on a single donor-acceptor molecule.…”

The evolution of microscopic process mediated by current and temperature in Rubrene-based organic light emitting diodes

“…质, 导致Rubrene器件中SF过程与TF过程能够共存, 但在室温下由于热声子的扰动, 三重态激子的寿命 较短, TF过程不容易发生, 器件中主要表现为SF过 程. Bai等人 [11] [5,11] , 由此可判断, 本器件中 [16] , 有助于空穴的注入. m-MTDATA分子的LUMO能级 (~1.9 eV) [17] 与Rubrene分子的LUMO能级(~3.2 eV) [11] 间 存在较高的势垒(~1.…”