102884-08-2Relevant articles and documents
Emitters with a pyridine-3,5-dicarbonitrile core and short delayed fluorescence lifetimes of about 1.5 μs: Orange-red TADF-based OLEDs with very slow efficiency roll-offs at high luminance
Chen, Zhanxiang,Wu, Zhongbin,Ni, Fan,Zhong, Cheng,Zeng, Weixuan,Wei, Danqing,An, Kebin,Ma, Dongge,Yang, Chuluo
, p. 6543 - 6548 (2018)
The efficiency roll-off with increasing brightness in thermally activated delayed fluorescence (TADF)-based OLEDs greatly impedes their future applications. The combination of varying numbers of phenoxazine (PXZ) donors with pyridine-3,5-dicarbonitrile (PCN) acceptors has afforded three orange-red TADF emitters PXZ-PCN, bis-PXZ-PCN and tri-PXZ-PCN. The singlet-triplet energy gap (ΔEST) of the molecules is in good agreement with that predicted by corrected time-dependent density functional theory. When bis-PXZ-PCN is doped into the host material CBP (10 wt%), the ΔEST value of 0.04 eV is achieved, and this facilitates effective reverse intersystem crossing (RISC, kRISC = 9.8 × 105 s-1). Bis-PXZ-PCN endows its device with orange-red electroluminescence peak at 600 nm, accompanied by maximum external quantum efficiency of 9.8% and an impressive slow efficiency roll-off of 15% at a high luminance of 1000 cd m-2, which is among the lowest roll-off value of the reported orange-red to red TADF-based OLEDs.
β-enaminonitriles in heterocyclic synthesis: Synthesis of new 1,4-dihydropyridine, pyrazolo[1,5-a]pyrimidine, aminothiophene and pyridine derivatives
Hafiz, Ibrahim S. A.
, p. 321 - 325 (2007/10/03)
Utility of 3-aminocinnamonitrile (1) in the synthesis of new 1,4-dihydropyridine, pyrazolo[1,5-a]pyrimidine, aminothiophene and pyridine derivatives is reported.
