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Azide‐substituted Poly( N ‐ethyl‐3‐vinylcarbazole) as a Thermally Cross‐Linkable Hole‐Transporting Material for Polymeric Light‐Emitting Diodes
Author(s) -
Leung Mankit,
Chang ChiouLing,
Chang ChungYi,
Chuang ChingNan,
Lin CheTseng
Publication year - 2018
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201700202
Subject(s) - chemistry , triphenylamine , polymer , coating , polymer chemistry , alkyne , curing (chemistry) , azide , chemical engineering , oled , photochemistry , organic chemistry , catalysis , engineering , layer (electronics)
We have successfully synthesized a series of thermally cross‐linkable azide‐substituted poly( N ‐ethyl‐3‐vinylcarbazoles) P1–P6 . These polymers can be self‐cross‐linked by heat treatment under atmospheric conditions to form insoluble polymer matrices. Their electronic properties can be tuned by using various triphenylamine‐substituted alkyne‐based curing agents as additives. The polymeric materials can be simply coated on a substrate by spin coating or dip coating. Through the Huisgen 1,3‐dipolar cycloaddition reaction, the polymeric film can be cured by alkyne‐based curing agents effectively under copper‐free conditions. This approach can be utilized in the fabrication of multilayer polymeric light‐emitting devices ( PLEDs ). Under optimized conditions, we have demonstrated that the PLED of ITO /cured P5 / PVK ‐Ir(ppy) 3 ‐ t ‐ PBD /Mg–Ag shows a turn‐on voltage of 10.1 V (1 cd/m 2 ), with the maximum brightness of 7851 cd/m 2 and current efficiency of 12.8 cd/A.