Aggregation and permeation of 4-(dicyanomethylene)-2-methyl-6-(p- dimethylaminostyryl)-4H-pyran molecules in Alq

G. Y. Zhong, Z. Xu, J. He, S. T. Zhang, Y. Q. Zhan, X. J. Wang, Z. H. Xiong, H. Z. Shi, X. M. Ding, W. Huang, X. Y. Hou

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Abstract

The morphologic and luminescent behaviors of various 4-(dicyanomethylene)- 2methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM) containing films have been investigated. This involves pure DCM layers deposited on top of a tris-(8-hydroxyquinoline) aluminum (Alq) layer or positioned between two Alq layer, DCM-doped Alq films, and periodically arranged Alq/DCM multilayer structures. The occurrence over a period of time of aggregation and permeation of DCM molecules at room temperature and at temperatures as low as ∼260K is found in all the cases studied. Such a phenomenon will result in degradation of related organic light-emitting devices and is closely related to the electric polarity of the DCM molecule.

Original languageEnglish
Pages (from-to)1122-1124
Number of pages3
JournalApplied Physics Letters
Volume81
Issue number6
DOIs
StatePublished - 5 Aug 2002
Externally publishedYes

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