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20 April 2006 Highly efficient blue phosphorescent OLEDs using large bandgap host materials
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The synthesis and properties of 3,6-bis(triphenylsilyl)carbazole as an effective host material for blue electrophosphorescence are reported. The electrochemically active C3 and C6 sites of carbazole are non-conjugated blocked with the steric, bulky and large-gap triphenylsilyls, the resulting new compound retains the large triplet energy of carbazole yet exhibits much enhanced morphological stability and electrochemical stability in comparison with previous carbazole-based host materials. Using this new host material, blue phosphorescent OLEDs having high efficiencies up to 16%, 30.6 cd/A and 26.7 lm/W are demonstrated.
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Fu-Chuan Fang, Yuan-Li Liao, Ken-Tsung Wong, Ming-Han Tsai, Hao-Wu Lin, Hai-Ching Su, Chung-chih Wu, and Chih-I Wu "Highly efficient blue phosphorescent OLEDs using large bandgap host materials", Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 61921R (20 April 2006);

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