Highly Efficient Light-Emitting Electrochemical Cells (LECs) from Host-Guest Cationic Iridium(III) Complexes

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概要

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• Five charged iridium(III) complexes with a different number and position of methyl group; [Ir(phen)(ppy)2]PF6 (1), [Ir(4-phen)(ppy)2]PF6 (2), [Ir(2,9-phen)(ppy)2]PF6 (3), [Ir(4,7-phen)(ppy)2]PF6 (4) and [Ir(4,5,6,7- phen)(ppy)2]PF6 (5) were synthesized and characterized by NMR, IR, UV-Vis absorption, fluorescence spectroscopy and cyclic voltammetry. The host-guest light-emitting electrochemical cells (LECs) based on ITO/PEDOT:PSS/1- 5:PVK (1:4)/Al were investigated, which resulted in a maximum current efficiency at 1.35 cdA-1 and a brightness at 717 cdm-2 from 5. The host-guest LECs can be improved by the insertion of the TPBi and LiF layers. We found that the highly efficient electroluminescence device gave the peak current efficiency to 4.49 cdA-1, the maximum brightness at 1,200 cdm-2 with Commission Internationale de L'Eclairage (CIE) coordinates of (0.30, 0.54) from 3. [DOI: 10.1380/ejssnt.2014.141]

著者

• Wongkaew Praweena

  Center for Organic Electronic and Alternative Energy (COEA), Department of Chemistry, Faculty of Science, Ubon Ratchathani University

• Mahanitipong Usana

  Center for Organic Electronic and Alternative Energy (COEA), Department of Chemistry, Faculty of Science, Ubon Ratchathani University

• Wongsang Natsiri

  Center for Organic Electronic and Alternative Energy (COEA), Department of Chemistry, Faculty of Science, Ubon Ratchathani University

• Sahasithiwat Somboon

  National Metal and Materials Technology Center

• Jitchati Rukkiat

  Center for Organic Electronic and Alternative Energy (COEA), Department of Chemistry, Faculty of Science, Ubon Ratchathani University

関連論文

• Highly Efficient Light-Emitting Electrochemical Cells (LECs) from Host-Guest Cationic Iridium(III) Complexes

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