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Two n‐type (electron transport type) hosts derived from carboline and triazine, CblTrz and SiCblTrz, were prepared for high efficiency and long lifetime in deep blue phosphorescent organic light emitting diodes (PhOLEDs). Both materials have diphenyltriazine for acceptor moiety and α‐carboline for donor moiety. In case of SiCblTrz, triphenylsilyl group was attached to the core. The two hosts with...