Citation: ZHOU Liang, DENG Rui-Ping, ZHANG Hong-Jie*. Suppression of Efficiency Roll-off in Co-doped Electroluminescent Devices Based on Europium Complex[J]. Chinese Journal of Inorganic Chemistry, ;2014, 30(1): 113-120. doi: 10.11862/CJIC.2014.040
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By co-doping Alq3[tris(8-hydroxyquinoline) aluminum] and Eu(TTA)3phen (TTA=thenoyltrifluoroacetone, phen=1,10-phenanthroline) into CBP (4,4'-N,N' dicarbazole-biphenyl), a series of electroluminescent (EL) devices were fabricated and investigated. After optimizing the co-doping concentration of Alq3, significant suppression of ELefficiency roll-off and almost doubled maximum brightness were realized without deteriorating the color purity. The presence of Alq3 molecules in light-emitting layer (EML) not only facilitates the injection and transport of electrons but also retards the transport of holes. Alq3 molecules function as ladders of hole transfer from CBP to Eu(TTA)3phen molecules as supported by the EL spectroscopy results, thus facilitating the balance of holes and electrons on Eu(TTA)3phen molecules. Therefore, two possible reasons are suggested to be responsible for the suppression of EL efficiency roll-off: one is the broadening of recombination zone, the other is the improved balance of holes and electrons on Eu(TTA)3phen molecules.
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