Conversion process of the dominant electroluminescence mechanism in a molecularly doped organic light-emitting device with only electron trapping
Data(s) |
2007
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Resumo |
In this work, the detailed conversion process of the dominant electroluminescence (EL) mechanism in a device with Eu(TTA)(3)phen (TTA=thenoyltrifluoroacetone, phen=1,10-phenanthroline) doped CBP (4,4(')-N,N-'-dicarbazole-biphenyl) film as the emitting layer was investigated by analyzing the evolution of carrier distribution on dye and host molecules with increasing voltage. Firstly, it was confirmed that only electrons can be trapped in Eu(TTA)(3)phen doped CBP. As a result, holes and electrons would be situated on CBP and Eu(TTA)(3)phen molecules, respectively, and thus creates an unbalanced carrier distribution on both dye and host molecules. With the help of EL and photoluminescence spectra, the distribution of holes and electrons on both Eu(TTA)(3)phen and CBP molecules was demonstrated to change gradually with increasing voltage. Therefore, the dominant EL mechanism in this device changes gradually from carrier trapping at relatively low voltage to Forster energy transfer at relatively high voltage. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
Zhou L;Zhang HJ;Deng RP;Li ZF;Yu JB;Guo ZY.Conversion process of the dominant electroluminescence mechanism in a molecularly doped organic light-emitting device with only electron trapping,JOURNAL OF APPLIED PHYSICS ,2007 ,102(6):文献编号:064504 |
Palavras-Chave | #ENERGY-TRANSFER #EUROPIUM COMPLEX #LAYER #DIODES #DYE #EFFICIENCY #QUINACRIDONE #EMISSION |
Tipo |
期刊论文 |