Department of Physics and Institute of Advanced Materials, Hong Kong Baptist University , Kowloon Tong, Hong Kong SAR, China.
ACS Appl Mater Interfaces. 2015 Nov 18;7(45):24983-6. doi: 10.1021/acsami.5b05597. Epub 2015 Nov 4.
A blended bimolecular exciplex formation was demonstrated between two individual donor and acceptor molecules, which are tris(4-carbazoyl-9-ylphenyl)amine (TCTA) and 2,4,6-tris(3'-(pyridin-3-yl)biphenyl-3-yl)-1,3,5-triazine (Tm3PyBPZ). The photoluminescence spectrum of the exciplex in the solid state showed an emission with a peak around 514 nm (∼2.49 eV). By applying this exciplex as an emitting layer, a highly efficient all-fluorescent organic lighting emitting diode with maximum efficiencies of 13.1% and 53.4 lm/W can be realized under an extremely low turn-on voltage of only 2.4 V. The thermally activated delayed fluorescence (TADF) process is believed to be responsible for the excellent device performance.
两个单独的供体和受体分子——三(4-羧基-9-基苯基)胺（TCTA）和 2,4,6-三(3'-(吡啶-3-基)联苯-3-基)-1,3,5-三嗪（Tm3PyBPZ）之间形成了混合双分子激基复合物。在固态下，激基复合物的光致发光光谱显示出约 514nm（约 2.49eV）的发射峰。通过将该激基复合物用作发射层，可以在极低的开启电压仅为 2.4V 的情况下实现高效的全荧光有机发光二极管，其最大效率分别为 13.1%和 53.4lm/W。热激活延迟荧光（TADF）过程被认为是优异的器件性能的原因。
