Bis-Tridentate Iridium(III) Phosphors with Very High Photostability and Fabrication of Blue-Emitting OLEDs.
Hsin-Hung Kuo,Ze-Lin Zhu,Chun-Sing Lee,Yi-Kuang Chen,Shih-Hung Liu,Pi-Tai Chou,Alex K.-Y. Jen,Yun Chi,Yun Chi +8 more
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TLDR
It is promising that long lifespan blue OLED based on these emitters can be attained with further engineering of devices suitable for commercial application with a conceptual solution to the exceedingly stable and efficient blue phosphor.Abstract:
Sky-blue and blue-emitting, carbazolyl functionalized, bis-tridentate Ir(III) phosphors Cz-1-Cz-3 with bright emission and short radiative lifetime are successfully synthesized in a one-pot manner. They exhibit very high photostability against UV-vis irradiation in degassed toluene, versus both green and true-blue-emitting reference compounds, i.e., fac-[Ir(ppy)3] and mer-[Ir(pmp)3]. Organic light-emitting diodes (OLEDs) based on Cz-2 exhibit maximum external quantum efficiency (EQE) of 21.6%, EQE of 15.1% at 100 cd m-2, and with CIE x,y coordinates of (0.17, 0.25). This study provides a conceptual solution to the exceedingly stable and efficient blue phosphor. It is promising that long lifespan blue OLED based on these emitters can be attained with further engineering of devices suitable for commercial application.read more
Citations
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Molecular Design of Luminescent Gold(III) Emitters as Thermally Evaporable and Solution-Processable Organic Light-Emitting Device (OLED) Materials.
TL;DR: In this paper, a focus review summarizes the development of various series of luminescent gold(III) complexes to date and highlights important milestones in the development and advancement of gold-based organic light-emitting devices.
Journal ArticleDOI
Cyclometalated Ir(III) complexes towards blue-emissive dopant for organic light-emitting diodes: fundamentals of photophysics and designing strategies
Sunhee Lee,Won-Sik Han +1 more
TL;DR: In this article, the most common strategies towards achievement of a blue phosphorescent cyclometalated Ir(III) complex involve substitution of electron-withdrawing F atoms at the cyclometricalating ligands that stabilise the HOMO orbitals and use of a heteroleptic system with electron-rich ancillary ligands bearing a 5-membered ring heterocycle to increase the LUMO energy level.
Journal ArticleDOI
Effects of intramolecular and intermolecular interactions on excited state properties of two isomeric Cu complexes with AIE and TADF mechanisms in solid phase: A QM/MM study
TL;DR: In this article, the excited state properties of two isomeric Cu complexes (Complex 1 and Complex 2) with aggregation induced emission (AIE) and thermally activated delayed fluorescence (TADF) features are theoretically studied.
Journal ArticleDOI
Blue Emissive fac/mer‐Iridium (III) NHC Carbene Complexes and their Application in OLEDs
Muazzam Idris,Savannah C. Kapper,Abegail C. Tadle,Thilini Batagoda,Daniel Sylvinson Muthiah Ravinson,Opeoluwa Abimbola,Peter I. Djurovich,Jongchan Kim,Caleb Coburn,Stephen R. Forrest,Mark E. Thompson +10 more
Journal ArticleDOI
Phenyl- and Pyrazolyl-Functionalized Pyrimidine: Versatile Chromophore of Bis-Tridentate Ir(III) Phosphors for Organic Light-Emitting Diodes
Yi-Kuang Chen,Hsin-Hung Kuo,Dian Luo,Yi-Ning Lai,Wei-Cheng Li,Chih-Hao Chang,Daniel Escudero,Alex K.-Y. Jen,Ling-Yang Hsu,Yun Chi,Yun Chi +10 more
TL;DR: In this article, the spin density distribution of the pyrimidine-pyrazolate entity in m2h to the pyridine-phenyl fragment in m6h was analyzed.
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Deep blue phosphorescent organic light-emitting diodes with very high brightness and efficiency
Jaesang Lee,Hsiao-Fan Chen,Thilini Batagoda,Caleb Coburn,Peter I. Djurovich,Mark E. Thompson,Stephen R. Forrest +6 more
TL;DR: It is shown that N-heterocyclic carbene (NHC) Ir(III) complexes can serve as both deep blue emitters and efficient hole-conducting EBLs, and both the facial and the meridional isomers of the dopant have high efficiencies that arise from the unusual properties of the NHC ligand.
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Blue and near-UV phosphorescence from iridium complexes with cyclometalated pyrazolyl or N-heterocyclic carbene ligands.
Tissa Sajoto,Peter I. Djurovich,Arnold Tamayo,Muhammed Yousufuddin,Robert Bau,Mark E. Thompson,Russell J. Holmes,Stephen R. Forrest +7 more
TL;DR: Crystallographic analysis reveals that the imidazolyl-carbene ligand has a stronger trans influence than pyrazolyl and, thus, imparts a greater ligand field strength in the triscyclometalated Ir complexes.
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