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 shu

Suppression of Efficiency Roll-off in Co-doped Electroluminescent Devices Based on Europium Complex

1.
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Received Date: 23 September 2013
Available Online: 28 October 2013
Fund Project:

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.
- Eu³⁺ complexes;luminescent properties;electroluminescence;efficiency roll-off,
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沈阳化工大学材料科学与工程学院沈阳 110142