摘要
Charge transfer via electron hopping from an electron donor(D)to an acceptor(A)in nanoscale,plays a crucial role in optoelectronic materials,such as organic light-emitting diodes(OLEDs)and organic photovoltaic cells(OPVs).Here,we propose a strategy for binding D/A units in space,where intramolecular charge-transfer can take place.The resulted material DM-Me-B is able to give bright emission in this molecular architecture because of the good control of D/A interaction and conformational rigidity.Moreover,DM-Me-B presents small singlet-triplet splitting energy,enabling thermally activated delayed fluorescence.Therefore,the DM-Me-B exhibits~20%maximum external quantum efficiency and low efficiency roll-off at 1000 cd/m^(2),certifying an effective strategy in controlling D/A blocks through space.
基金
supported by the National Key R&D Program of China(No.2016YFB0400700)
the National Natural Science Foundation of China(Nos.51773141,61961160731 and 51873139)
funded by the Natural Science Foundation of Jiangsu Province of China(No.BK20181442)
Collaborative Innovation Center of Suzhou Nano Science&Technology
the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
the"111"Project。
