Diphenylaminofluorene-Based Donor-Acceptor Molecules for Blue Light-Emitting Diodes

초록

A series of blue fluorescent 2-diphenylaminofluorene-7-ylstyrene derivatives end-capped with electron-accepting groups, such as methylpyridine, qunoline, isoqunoline, phenanthridine were synthesized and characterized. To examine the electroluminescent properties of these molecules, multilayer devices were fabricated. The device D exhibited highly efficient blue emission with a luminous efficiency (LE), power efficiency (PE) and CIEx,y coordinates of 7.13 cd/A, 2.80 lm/W at 20 mA/cm(2) and (0.148, 0.191) at 7.0 V, respectively. In addition, the device A showed efficient deep-blue emission with a LE, PE and CIEx, y coordinates of 6.85 cd/A, 2.68 lm/W at 20 mA/cm(2), and (0.147, 0.152) at 7.0 V, respectively.

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