Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 40, Pages 27383-27393Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b10020
Keywords
phosphine oxide; electron transporting material; thermally activated delayed fluorescence; asymmetrical configuration; interfacial effect
Funding
- NSFC [51373050, 21672056, 61605042, 21602048]
- Science and Technology Bureau of Heilongjiang Province [ZD201402, JC2015002]
- Education Bureau of Heilongjiang Province [2014CJHB005]
- Fok Ying-Tong Education Foundation for Young Teachers in the Higher Education Institutions of China [141012]
- Harbin Science and Technology Bureau [2015RAYXJ008]
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Three asymmetrical electron transporters as dibenzothiophene sulfone (DBSO)-diphenylphosphine oxide (DPPO) hybrids, collectively named mnDBSODPO, were designed and prepared. All of these materials achieve the high triplet energy of similar to 3.0 eV to restrain the exciton linkage from emissive layers. The dependence of inductive and steric effects for DPPO groups on the substitution position, the intermolecular interaction suppression, the encapsulations of high-polar DBSO cores, and the favorable electrical performance are successfully integrated on 36DBSODPO, which can simultaneously suppress the exciton quenching by formation of an interfacial dipole and enhancing the charge flux balance. As a result, 36DBSODPO endowed its tetralayer blue thermally activated delayed fluorescence (TADF) devices with impressive performance, including the maximum external quantum efficiency around 19%, and reduced efficiency roll-offs, which verifies the great potential-of asymmetrical electron transporting materials for highly efficient TADF devices.
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