Comparison Study of Phenylquinoline-based Iridium(III) Complexes for Solution Processable Phosphorescent Organic Light-Emitting Diodes by PEDOT:PSS and Graphene Oxide as a Hole Transport Layer |
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| Authors: | Chikyu Lee Eun Ju Park Miseon Won Yeong-Soon Gal Jun Liu Liming Dai |
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| Affiliation: | 1. Department of Chemistry Education, Graduate Department of Chemical Materials, BK 21 PLUS Team for Advanced Chemical Materials, and Institute for Plastic Information and Energy Materials, Pusan National University, Busan, Republic of Korea;2. Polymer Chemistry Lab., Kyungil University, Hayang;3. Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio, USA |
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| Abstract: | Electroluminescent (EL) properties of Ir(III) complex, [(2,4-diphenylquinoli-ne)]2Iridium picolinic acid N-oxide [(DPQ)2Ir(pic-N-O)] were investigated using PEDOT:PSS and reduced graphene oxide (rGO) as a hole transport layer for solution processable phosphorescent organic light-emitting diodes (PhOLEDs). High performance solution-processable PhOLED with PEDOT:PSS and (DPQ)2Ir(pic-N-O) (8 wt%) doped CBP:TPD:PBD (8:56:12) host emission layer were fabricated to give a high luminance efficiency (LE) of 26.9 cd/A, equivelent to an external quantum efficiency (EQE) of 14.2%. The corresponding PhOLED with rGO as a hole transport layer exhibited the maximum brightness and LE of 13540 cd/m2 and 16.8 cd/A, respectively. The utilization of the solution processable rGO thin films as the hole transport layer offered the great potential to the fabrication of solution processable PhOLEDs. |
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| Keywords: | organic light-emitting diodes iridium complex phosphorescent solution processable graphene oxide picolinic acid N-oxide |
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