Phosphorescent iridium(III) complexes with nonconjugated cyclometalated ligands

Chemistry : a European Journal
Yi-Hwa SongChung-Chih Wu

Abstract

A series of blue phosphorescent iridium(III) complexes 1-4 with nonconjugated N-benzylpyrazole ligands were synthesized and their structural, electrochemical, and photophysical properties were investigated. Complexes 1-4 exhibit phosphorescence with yields of 5-45 % in degassed CH2Cl2. Of the compounds, 1 showed emission that was nearly true blue at 460 nm with a lack of vibronic progression. These photophysical data clearly demonstrate that the methylene spacer of the cyclometalated N-benzylpyrazole chelate effectively interrupts the pi conjugation upon reacting with a third L X chelating chromophore. This gives a feasible synthesis for the blue phosphorescent complexes with a sufficiently large energy gap. In another approach, these complexes were investigated for their suitability for the host material in phosphorescent OLEDs. The device was synthesized by using 1 as the host for the green-emitting [Ir(ppy)3] dopant, which exhibits an external quantum conversion efficiency (EQE) of up to 11.4 % photons per electron (and 36.6 cdA(-1)), with 1931 Commission Internationale de L'Eclairage (CIE) coordinates of (0.30, 0.59), a peak power efficiency of 21.7 lmW(-1), and a maximum brightness of 32000 cdm(-2) at 14.5 V. At the practi...Continue Reading

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Citations

Oct 16, 2015·Chemical Society Reviews·Jianzhang ZhaoFangfang Zhong
Feb 18, 2014·Chemical Society Reviews·Hui XuXiaogang Liu
Mar 16, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Claus HierlingerEli Zysman-Colman
Dec 9, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Yuyang ZhouMing Zhou
Jun 28, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Yuyang ZhouMing Zhou
Jul 17, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Stephanie A MooreBrian O Patrick
Nov 22, 2018·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Yun ChiParamaguru Ganesan
Oct 3, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Kie YamadaMasa-Aki Haga
Nov 19, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Giorgio VolpiCarlo Nervi
Oct 3, 2012·Chemical Communications : Chem Comm·Andrew J HallettSimon J A Pope
Aug 13, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Jui-Yi HungChung-Chih Wu
Sep 24, 2016·Chemistry : a European Journal·Yuyang ZhouNan Xu
Jun 22, 2017·Advanced Materials·Hsin-Hung KuoGene-Hsiang Lee
Jan 30, 2010·Chemical Society Reviews·Yun Chi, Pi-Tai Chou
Mar 23, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Fushi ZhangPi-Tai Chou
Feb 13, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Pierre-Henri LanoëHani Amouri
Jun 23, 2009·Journal of the American Chemical Society·Tissa SajotoMark E Thompson
Dec 16, 2010·Inorganic Chemistry·Etienne BaranoffMd Khaja Nazeeruddin
Sep 4, 2013·Journal of the American Chemical Society·Sunghun LeeYun-Hi Kim

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