1 Ocak 2021 Dergi makalesi Açık Erişim

Altinolcek, Nuray; Battal, Ahmet; Tavasli, Mustafa; Cameron, Joseph; Peveler, William J.; Yu, Holly A.; Skabara, Peter J.; Fairbairn, Nicola J.; Hedley, Gordon J.

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    <subfield code="a">A red-orange carbazole-based iridium(III) complex: Synthesis, thermal, optical and electrochemical properties and OLED application</subfield>
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    <subfield code="a">A novel heteroleptic iridium(III) acetylacetonate (acac) complex, (L-5-CHO)(2)Ir(acac) (3b), was synthesised from 2-(9'-hexylcarbazole-3'-yl)-5-formylpyridine (L-5-CHO) (1b). The complex 3b was determined to be thermally and electrochemically stable. The photoluminescence properties of the compound were studied, with a dichloromethane solution of 3b giving structureless emission at 662 nm, showing that the formyl group red-shifted the emission by 151 nm compared to the parent complex. Complex 3b was also shown to possess a moderate photoluminescence quantum yield (67%) and a short emission lifetime (tau = 280 ns). Organic light-emitting diodes (OLEDs) were fabricated with a solution-processed emissive layer (EML) consisting of poly(N-vinylcarbazole) (PVK), 2-(4-tert-butylphenyl)-5-(4-biphenylyl)-1,3,4-oxadiazole (PBD) and iridium complex (3b). The OLEDs containing complex 3b showed red-orange electroluminescence (EL) at 624 nm. The influence of the host materials was studied and the best performance was achieved with both PVK and PBD in the emissive layer, with the resulting OLEDs exhibiting a current efficiency of 0.84 cd/A, a power efficiency of 0.20 lm/W, and an external quantum efficiency (EQE) of 0.66% at a brightness of 2548 cd/m(2). (C) 2021 Elsevier B.V. All rights reserved.</subfield>
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