Design and Synthesis of a Y-Type Thioxanthone-Carbazole for the Application in Blue and Yellow Organic Light-Emitting Diodes
A Y-shaped emitter,TX-Ph2Cz,was designed and synthesized,which uses a thioketone unit as the acceptor and 9,9'-(1,3-phenylene)bis-9H-carbazole as the donor.The compound exhibited blue emission at about 420 nm in diluted solution and a small change in the different solvents with various polarities.In the mixed tetrahydrofuran(THF)/H2O solvents,emission bands had a red shift of 36 nm with the increased content of water.According to the single crystal structure,TX-Ph2Cz showed many intermolecular interaction and the π…π interaction between adjacent molecules would increase the intermolecular charge transfer.Critically,TX-Ph2Cz exhibited blue emission(440 nm)in the doped device,but yellow emission(540 nm)in the non-doped device was originated from the excimer of TX-Ph2Cz.Moreover,the maximum current efficiency and external quantum efficiency of non-doped device were 4.91 cd/A and 2.64％,respectively.
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