Structural effect of phenylcarbazole-based molecules on the exciplex-forming co-host system to achieve highly efficient phosphorescent OLEDs with low efficiency roll-off was written by Lee, Chih-Chien;Amin, Nurul Ridho Al;Xu, Jing-Jie;Wang, Bo-Cheng;Luo, Dian;Sutanto, Kevin;Biring, Sajal;Liu, Shun-Wei;Chen, Chih-Hsin. And the article was included in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices in 2021.Recommanded Product: 100189-84-2 This article mentions the following:
In this work, five phenylcarbazole-based mols. (PhCzs), i.e., PhCzp-Me, PhCzm-Me, PhCNCzp-Me, PhCNCzp-MeCzPh, and PhCNCzm-MeCzPh, were synthesized by linking two phenylcarbazole moieties with m-xylene or p-xylene as the π-linker. D. functional theory calculations showed that the dihedral angles of the mols. using p-xylene as the π-linker were in the range of 54.8°-55.7°, which are much smaller than those of the mols. using m-xylene as the π-linker (86.9°-91.4°). These mols. can form an exciplex with B3PyMPM, which is suitable for developing efficient OLEDs based on the co-host system. In this study, the OLED fabricated with the optimal exciplex host of PhCNCzm-MeCzPh/B3PyMPM doped with a phosphorescent emitter of Ir(ppy)2(acac) exhibited an external quantum efficiency (EQE) of 31.5% with the main emission peak at 524 nm corresponding to the CIE coordinates of (0.316, 0.641). This high EQE could be attributed to the higher triplet energy of the exciplex caused by the increase in the intermol. distance between the donor and the acceptor in the exciplex when sterically hindered m-xylene was applied as the π-linker of the PhCzs. Efficient charge transfer from the co-host to the dopant in the emitting layer was identified via the anal. of the photophys. and elec. properties of the OLED devices, which explains the high performance of the devices. In the experiment, the researchers used many compounds, for example, 2,5-Dibromo-1,3-dimethylbenzene (cas: 100189-84-2Recommanded Product: 100189-84-2).
2,5-Dibromo-1,3-dimethylbenzene (cas: 100189-84-2) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. alpha-Bromoesters are employed in the Reformatsky reaction for the synthesis of beta-hydroxyesters. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.Recommanded Product: 100189-84-2
Referemce:
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