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Instant Low‐Temperature Cross‐Linking of Poly( N ‐vinylcarbazole) for Solution‐Processed Multilayer Blue Phosphorescent Organic Light‐Emitting Devices
Author(s) -
Aizawa Naoya,
Pu YongJin,
Chiba Takayuki,
Kawata So,
Sasabe Hisahiro,
Kido Junji
Publication year - 2014
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.201402726
Subject(s) - materials science , oled , annealing (glass) , phosphorescence , solution process , brightness , optoelectronics , photochemistry , solvent , quantum efficiency , chemical engineering , nanotechnology , optics , fluorescence , organic chemistry , composite material , chemistry , layer (electronics) , physics , engineering
Poly( N ‐vinylcarbazole) undergoes cross‐linking to highly solvent‐resistant films through an oxidative coupling reaction, for which an annealing process takes only 3 min at 110 °C. This reaction allows the construction of a solution‐processed multilayer OLED without a time‐consuming annealing process. The maximum external quantum efficiency reaches 18%, and remains at 17%, even at a high brightness of 10 000 cd m −2 for all‐solution‐processed blue OLEDs.