Title Towards blue AIE/AIEE: synthesis and applications in OLEDs of tetra-/triphenylethenyl substituted 9,9-Dimethylacridine derivatives /
Authors Cekaviciute, Monika ; Petrauskaite, Aina ; Nasiri, Sohrab ; Simokaitiene, Jurate ; Volyniuk, Dmytro ; Sych, Galyna ; Budreckiene, Ruta ; Grazulevicius, Juozas Vidas
DOI 10.3390/molecules25030445
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Is Part of Molecules.. Basel : MDPI AG. 2020, vol. 25, iss. 3, art. no. 445, p. 1-16.. ISSN 1420-3049
Keywords [eng] acridan ; aggregation induced emission enhancement ; electroluminescence ; tetra-/triphenylethene
Abstract [eng] Aiming to design blue fluorescent emitters with high photoluminescence quantum yields in solid-state, nitrogen-containing heteroaromatic 9,9-dimethylacridine was refined by tetraphenylethene and triphenylethene. Six tetra-/triphenylethene-substituted 9,9-dimethylacridines were synthesized by the Buchwald-Hartwig method with relatively high yields. Showing effects of substitution patterns, all emitters demonstrated high fluorescence quantum yields of 26-53% in non-doped films and 52-88% in doped films due to the aggregation induced/enhanced emission (AIE/AIEE) phenomena. In solid-state, the emitters emitted blue (451-481 nm) without doping and deep-blue (438-445 nm) with doping while greenish-yellow emission was detected for two compounds with additionally attached cyano-groups. The ionization potentials of the derivatives were found to be in the relatively wide range of 5.43-5.81 eV since cyano-groups were used in their design. Possible applications of the emitters were demonstrated in non-doped and doped organic light-emitting diodes with up to 2.3 % external quantum efficiencies for simple fluorescent devices. In the best case, deep-blue electroluminescence with chromaticity coordinates of (0.16, 0.10) was close to blue color standard (0.14, 0.08) of the National Television System Committee.
Published Basel : MDPI AG
Type Journal article
Language English
Publication date 2020
CC license CC license description