Efficient deep-blue electroluminescent devices based on a novel β-diketone zinc complex

摘要

A novel zinc complex Zn(PhCzKt)2 with beta-diketone unit as chelating group was synthesized, where PhCzKt is dehydrogenation 1-(4-(tert-butyl) phenyl)-3-(9-ethyl-9H-carbazol-3-yl) propane-1,3-dione. Its structure was characterized by 1H NMR, MS and EA. Its UV-vis, PL, thermal stability, and electrochemistry were studied. The luminescent mechanism was also explored by calculations of DFT (density functional theory) and time -dependent DFT. Zn(PhCzKt)2-based electroluminescent devices were manufactured by using evaporation tech-nique. The devices present efficient luminescence with maximum EQE of 1.54 %, and the CIE(x,y)1931 of the EL spectrum is(0.1558, 0.0901), displaying a deep-blue emission.

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