Novel donor-spacer-acceptor compound as the multifunctional component of exciplexes for efficient organic light-emitting diodes
نویسندگان
چکیده
By connecting tercarbazole (3Cz) and triphenyltriazine (TRz) units with a diphenyl ether group, we designed synthesized new donor-spacer-acceptor structure molecule 9′-(4-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenoxy) phenyl)-9′H-9,3′:6′,9″-tercarbazole (3Cz-o-TRz) as the multifunctional component of exciplex emitters. As expected, intermolecular charge-transfer transition is dominant for 3Cz-o-TRz because space-enough conjugation-forbidden linkage increasing intrinsic characteristics 3Cz TRz moieties in its single-molecule state. Accordingly, three common electron acceptors (4,6-bis(3,5-di(pyridin-3-yl)phenyl)-2-methylpyrimidine (B3PyMPm), 4,6-bis(3,5-di(pyridin-4-yl)phenyl)-2-methylpyrimidine (B4PyMPm), (1,3,5-triazine-2,4,6-triyl) tris(benzene-3,1-diyl)tris(diphenylphosphineoxide) (POT2T)) donors (4,4′-(cyclohexane-1,1-diyl)bis(N, N-di-p-tolylaniline) (TAPC), tris(4-(10H-phenoxazin-10-yl)phenyl)amine (TPA-PXZ), N1-phenyl-N4, N4-bis(4-(phenyl(m-tolyl)amino)phenyl)-N1-(m-tolyl)benzene-1,4-diamine (m-MTDATA)) were chosen to construct six emitters 3Cz-o-TRz. In organic light-emitting diodes (OLEDs), emission spectra these could be gradually modulated from 510 590 nm. addition, TAPC:3Cz-o-TRz- 3Cz-o-TRz:PO-T2T-based OLEDs achieved desirable performance maximum external quantum efficiencies (EQEs) around 12%. Moreover, simple tandem OLED containing TAPC:3Cz-o-TRz 3Cz-o-TRz:PO-T2T realized optimal an ultralow turn-on voltage 2.4 V EQE 14.1%. These results indicate great potential compounds developing
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ژورنال
عنوان ژورنال: Science China. Materials
سال: 2021
ISSN: ['2095-8226', '2199-4501']
DOI: https://doi.org/10.1007/s40843-021-1752-7