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Başlık: Colour tuning from green to red by substituent effects in phosphorescent tris-cyclometalated iridium(III) complexes of carbazole-based ligands: Synthetic, photophysical, computational and high efficiency OLED studies
Yazarlar: Moore, Tom N.
Zheng, Yonghao
Bryce, Martin R.
Fox, Mark A.
Griffiths, Gareth C.
Jankus, Vygintas
Al-Attar, Hameed A.
Monkman, Andrew P.
Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.
0000-0002-9466-1111
Tavaslı, Mustafa
AAB-1630-2020
6506308760
Anahtar kelimeler: Chemistry
Materials science
Light-emitting-diodes
Density-functional theory
Electroluminescent properties
Ir(III) complexes
Electrochemical properties
9-arylcarbazole moieties
State properties
III complexes
Emission
Devices
Charge transfer
Computational efficiency
Excited states
Iridium
Ligands
Light emission
Light emitting diodes
Phosphorescence
Polycyclic aromatic hydrocarbons
Pyridine
Quantum efficiency
Quantum yield
Carbazole units
Carbazolyl
Current efficiency
Electron-donating ability
Emission maxima
External quantum efficiency
Host polymers
Iridium complex
Methoxy
Organic light-emitting devices
Phosphorescence quantum yield
Photophysical
Poly(9-vinylcarbazole)
Pyridine ligands
Pyridyl rings
Red-shifted
Solution-processed
Substituent effect
Trifluoromethyl
Iridium compounds
Yayın Tarihi: 2012
Yayıncı: Royal Soc Chemistry
Atıf: Tavaslı, M. vd. (2012). "Colour tuning from green to red by substituent effects in phosphorescent tris-cyclometalated iridium(III) complexes of carbazole-based ligands: Synthetic, photophysical, computational and high efficiency OLED studies". Journal of Materials Chemistry, 22(13), 6419-6428.
Özet: Two series of fac-tris-cyclometalated iridium(III) complexes, series 1 from the 2-(carbazol-3'-yl)-pyridine ligands, and series 2 from the isomeric 2-(carbazol-2'-yl)-pyridine ligands, have been characterised. The photoluminescence and electroluminescence from series 2 complexes are red shifted compared to series 1 complexes, due to the increased electron donating ability of the carbazole unit in series 2. The attachment of trifluoromethyl and methoxy substituents to the pyridyl ring in these complexes results in colour tuning of phosphorescence energy maxima over the range 494-637 nm (green to red). These complexes possess predominantly (MLCT)-M-3 (metal-to-ligand-charge transfer) excited states. DFT/TD-DFT computations correctly predict the phosphorescence emission maxima and show that the HOMOs in these complexes contain mixed iridium and carbazolyl character. The carbazolyl ligand contributions to the excited states increase in series 2 compared to series 1. Complexes of series 1 exhibit high phosphorescence quantum yields whereas complexes of series 2 show lower quantum yields. Solution processed organic light emitting devices (OLEDs) with series 1 complexes using the high triplet poly(9-vinylcarbazole) (PVK) as the host polymer exhibit very high performances of up to 40 cd A(-1) and external quantum efficiency of 12%. For series 2 the highest current efficiency is 10.3 cd A(-1) and external quantum efficiency of 5.6%.
URI: https://doi.org/10.1039/c2jm15049b
https://pubs.rsc.org/en/content/articlelanding/2012/jm/c2jm15049b/unauth
http://hdl.handle.net/11452/22887
ISSN: 0959-9428
1364-5501
Koleksiyonlarda Görünür:Scopus
Web of Science

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