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Dr. Hong Huang, Yixin Wang, Biao Pan, Xiao Yang, Prof. Dr. Lei Wang, Dr. Jiangshan Chen, Prof. Dr. Dongge Ma and Prof. Dr. Chuluo Yang Simple Bipolar Hosts with High Glass Transition Temperatures Based on 1,8-Disubstituted Carbazole for Efficient Blue and Green Electrophosphorescent Devices with “Ideal” Turn-on Voltage Chemistry - A European Journal 19

Version of Record online: 23 NOV 2012 | DOI: 10.1002/chem.201202329

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Glow in the dark: Two hybrids based on 1,8-disubstituted carbazole with a twist structure were designed and synthesized. Blue phosphorescent organic light-emitting devices (PhOLEDs) containing benzimidazole units exhibited a similar performance to a similarly structured device based on the mCP host (mCP = N,N′-dicarbazoyl-3,5-benzene). Green PhOLEDs employing the new host material 1,8-OXDCz exhibited an ideal turn-on voltage (2.5 V at 1.58 cd m−2), a maximum current efficiency of 73.9 cd A−1, and a power efficiency of 89.7 lm W−1 (see figure).

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