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Olaru, Marian; Rychagova, Elena; Ketkov, Sergey; Shynkarenko, Yevhen; Yakunin, Sergii; Kovalenko, Maksym V; Yablonskiy, Artem; Andreev, Boris; Kleemiss, Florian; Beckmann, Jens; Vogt, Matthias
Journal of the American Chemical Society, 01/2020, Letnik: 142, Številka: 1Journal Article
Organic light-emitting diodes (OLEDs) are revolutionizing display applications. In this aspect, luminescent complexes of precious metals such as iridium, platinum, or ruthenium still playing a significant role. Emissive compounds of earth-abundant copper with equivalent performance are desired for practical, large-scale applications such as solid-state lighting and displays. Copper(I)-based emitters are well-known to suffer from weak spin–orbit coupling and a high reorganization energy upon photoexcitation. Here we report a cationic organo-copper cluster Cu4(PCP)3+ (PCP = 2,6-(PPh2)2C6H3) that features suppressed nonradiative decays, giving rise to a robust narrow-band green luminophore with a photoluminescent (PL) efficiency up to 93%. PL decay kinetics corroborated by DFT calculations reveal a complex emission mechanism involving contributions of both thermally activated delayed fluorescence and phosphorescence. This robust compound was solution-processed into a thin film in prototype OLEDs with external quantum efficiency up to 11% and a narrow emission bandwidth (65 nm fwhm).
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