Electroluminescence and hyperphosphorescence from stable blue Ir(III) carbene complexes with suppressed efficiency roll-off

Jie Yan, Dong-Ying Zhou, Liang-Sheng Liao (), Martin Kuhn, Xiuwen Zhou (), Shek-Man Yiu and Yun Chi ()
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Jie Yan: City University of Hong Kong
Dong-Ying Zhou: Soochow University
Liang-Sheng Liao: Soochow University
Martin Kuhn: The University of Queensland
Xiuwen Zhou: The University of Queensland
Shek-Man Yiu: City University of Hong Kong
Yun Chi: City University of Hong Kong

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Efficient Förster energy transfer from a phosphorescent sensitizer to a thermally activated delayed fluorescent terminal emitter constitutes a potential solution for achieving superb blue emissive organic light-emitting diodes, which are urgently needed for high-performance displays. Herein, we report the design of four Ir(III) metal complexes, f-ct1a ‒ d, that exhibit efficient true-blue emissions and fast radiative decay lifetimes. More importantly, they also undergo facile isomerization in the presence of catalysts (sodium acetate and p-toluenesulfonic acid) at elevated temperature and, hence, allow for the mass production of either emitter without decomposition. In this work, the resulting hyper-OLED exhibits a true-blue color (Commission Internationale de I’Eclairage coordinate CIEy = 0.11), a full width at half maximum of 18 nm, a maximum external quantum efficiency of 35.5% and a high external quantum efficiency 20.3% at 5000 cd m‒2, paving the way for innovative blue OLED technology.

Date: 2023
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DOI: 10.1038/s41467-023-42090-z

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