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Enhanced Performance of All‐Solution Processed Multilayer OLEDs by Photoluminescence Lifetime Reduction of Cu(I) Complex Emitters Containing Chalcogenolate‐Diimine Ligands
Author(s) -
Salla Cristian A. M.,
Farias Giliandro,
Pereira Alessandra,
Cremona Marco,
Quirino Welber G.,
Legnani Cristiano,
Souza Bernardo,
Bechtold Ivan H.
Publication year - 2021
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202100438
Subject(s) - chemistry , oled , photoluminescence , common emitter , phenanthroline , diimine , luminescence , photochemistry , fluorescence , phosphorescence , quantum yield , copper , optoelectronics , inorganic chemistry , catalysis , materials science , organic chemistry , physics , layer (electronics) , quantum mechanics
Luminescent and solution‐processable copper(I) complexes offer the perspective of obtaining devices that combine efficiency and stability at low production costs. Here, we investigate Cu(I) complexes with phosphine and 1,10‐phenanthroline‐derived ligands, which show thermally activated delayed fluorescence (TADF) and phosphorescence applied to all‐solution processed multilayer OLEDs. Unsubstituted, thiadiazole‐substituted and selenodiazole‐substituted phenanthroline ligands were compared to evaluate the potential of the incorporation of sulfur and selenium atoms to enhance the device performance. A shortening of the photoluminescence lifetime of the selenium‐containing emitter was found to compensate this emitter's lower emission yield, leading to devices of comparable performance to devices based on the more efficiently emitting unsubstituted phenanthroline complex. The results indicate that the emission lifetime reduction is a promising approach to improve OLEDs based on solution‐processable Cu(I) complexes.