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Diffusion – the Hidden Menace in Organic Optoelectronic Devices
Author(s) -
Smith Arthur R. G.,
Lee Kwan H.,
Nelson Andrew,
James Michael,
Burn Paul L.,
Gentle Ian R.
Publication year - 2012
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201104029
Subject(s) - triphenylamine , iridium , diffusion , materials science , layer (electronics) , tris , biphenyl , fick's laws of diffusion , electron , optoelectronics , solid state , nanotechnology , engineering physics , organic chemistry , physics , chemistry , nuclear physics , thermodynamics , biochemistry , catalysis
In a film stack of bathocuproine (BCP) (electron transport layer), fac ‐tris(2‐phenylpyridyl)iridium(III) [Ir(ppy) 3 ] blended in 4,4′‐bis( N ‐carbazolyl)biphenyl (CBP) (light‐emitting layer), and 4,4′,4″‐tris( N ‐carbazolyl)triphenylamine (TCTA) (hole transport layer), the BCP and Ir(ppy) 3 :CBP layers rapidly interdiffuse by anomalous Fickian diffusion. Diffusion leads to a decrease of up to 33% in the solid‐state emission but no change in color.