Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1440178 | Synthetic Metals | 2016 | 7 Pages |
•A blue fluorophore tert-butylated 9,9′-bianthracene for fluorescence OLED applications.•BAn-(4)-tBu with a TICT-state to obtain high-efficiency electroluminescence.•The doped device using BAn-(4)-tBu as a host exhibits excellent performance (6.00 cd A−1, 3.22%).•The doped device presents a low efficiency roll-off.
An orthogonally twisting tert-butylated 9,9′-bianthracene derivative, namely 10,10′-bis(4-tert-butylphenyl)-9,9′-bianthracene (BAn-(4)-tBu), possessing high thermal stability and high luminescence efficiency was synthesized. The BAn-(4)-tBu emitter with a twisted intramolecular charge transfer state characteristics, originating from its twisting 9,9′-bianthracene moiety, enhanced the occurrence of singlet excitons in the fluorescent emitter. The BAn-(4)-tBu device doped with sky blue fluorescent material 4,4-bis[4-(di-p-tolylamino)styryl]biphenyl displayed a maximum singlet generation fraction of >25%, maximum current and external quantum efficiencies of 6.00 cd A−1 and 3.22%, respectively. Remarkably, a low efficiency roll-off was observed. These results demonstrated that BAn-(4)-tBu as a host material is advantageous for fabrication of highly efficient blue fluorescent organic light-emitting devices.