Abstract
An efficient blue organic light-emitting diode with 1,4-bis[2-(3-N-ethylcarbazoryl)vinyl]benzene doped into 4,4′-N,N′-dicarbazole-biphyenyl is reported. Maximum luminance and external quantum efficiency are 8500 cd/m2 and 2.6%. CIE-1931 coordinates are x=0.15, y=0.16. The device performance was further improved by introducing bis(2-methyl-8quinolinato)4-phenylphenolate aluminum to assist electron injection. The maximum luminance and quantum efficiency reached 11000 cd/m2 and 3.3%, respectively. Föster energy transfer and especially a carrier trapping mechanism are considered to dominate in the process of electroluminescence.
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