Please use this identifier to cite or link to this item: http://hdl.handle.net/11452/30214
Title: Yellowish-orange and red emitting quinoline-based iridium(III) complexes: Synthesis, thermal, optical and electrochemical properties and OLED application
Authors: Battal, Ahmet
Cameron, Joseph
Peveler, William J.
Yu, Holly A.
Skabara, Peter J.
Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.
0000-0002-9466-1111
CCY-8756-2022
Altınölçek, Nuray
Tavaşlı, Mustafa
56955836600
6506308760
Keywords: Formyl group
2-Phenylquinoline
Iridium
Heteroleptic
Phosphorescence
Electroluminescence
External quantum efficiency
Highly efficient
Photophysical properties
Deep-red
Energy-transfer
Diodes
Ligands
Color
Emission
2-phenylpyridine
Materials science
Physics
Polymer science
Amorphous materials
Charge transfer
Citrus fruits
Dichloromethane
Differential scanning calorimetry
Electroluminescence
Energy absorption
Gravimetric analysis
Ligands
Mass spectrometry
Nuclear magnetic resonance spectroscopy
Organic light emitting diodes (OLED)
Phosphorescence
Quantum efficiency
Synthesis (chemical)
Thermogravimetric analysis
Cyclometallating ligands
Dichloromethane solutions
External quantum efficiency
Low-energy absorption band
Metal to ligand charge transfers
Phosphorescent emission
Phosphorescent organic light emitting diodes
Thermal gravimetric analyses (TGA)
Iridium compounds
Issue Date: 6-Jul-2020
Publisher: Elsevier Science
Citation: Altınölçek, N. vd. (2020). "Yellowish-orange and red emitting quinoline-based iridium(III) complexes: Synthesis, thermal, optical and electrochemical properties and OLED application". Synthetic Metals, 268.
Abstract: Two novel heteroleptic iridium(III) acetylacetonate (acac) complexes K3a and K3b were synthesised from cyclometallating ligands of 2-(4'-formylphenyl)quinoline lla and 2-(5'-formylphenyl)quinoline 11b. Complexes K3a and K3b were fully characterised by NMR spectroscopy, mass spectrometry and FT-IR. Differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA) indicate that both complexes were amorphous solids, stable up to 303 degrees C and 313 degrees C, respectively. Complexes K3a and K3b showed strong, high-energy absorption bands ( <400 nm) due to ligand-centred ((LC)-L-1) transitions and weaker, low-energy absorption bands (400 - 600 nm) arising from a mixture of metal-to-ligand charge transfer ((MLCT)-M-1/(MLCT)-M-3) and ligand-centred ((LC)-L-3) transitions. In degassed dichloromethane solutions, complexes K3a and K3b gave yellowish-orange and red phosphorescent emissions at 579 nm and 630 nm, with quantum efficiencies of 99.3 % and 79.3 %, respectively. At positive potential, complexes K3a and K3b exhibited a one-electron reversible oxidation (En) peak at 0.69 V and a quasi-reversible oxidation (ET1/2ox) peak at 0.60 V, respectively, which were assigned to the Ir (III)/Ir(IV) couple. At negative potentials, complexes K3a and K3b exhibited a one-electron irreversible reduction peak at -1.79 V and -1.94 V, respectively. Phosphorescent organic light-emitting diodes (PhOLEDs) were fabricated with a device configuration of ITO/PEDOT:PSS/EML/TPBi/LiF/Al, in which K3a and K3b gave yellowish-orange and red electroluminescence (EL) at 572 nm and 628 nm, respectively. Complex K3a gave the highest luminance of 2773 cd/m(2), current efficiency of 3.3 cd/A, external quantum efficiency of 1.2 % and maximum power efficiency of 1.05 lm/W with a turn-on voltage of 5.0 V (Device A).
URI: https://doi.org/10.1016/j.synthmet.2020.116504
https://www.sciencedirect.com/science/article/pii/S0379677920304975
http://hdl.handle.net/11452/30214
ISSN: 0379-6779
Appears in Collections:Scopus
Web of Science

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