Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 14, Pages 4789-4800Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc06813a
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Funding
- Center for Advanced Soft Electronics under the Global Frontier Research Program [2012M3A6A5055225]
- Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) of Korea [2015M1A2A2056216]
- Samsung Display Corporation
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To fight against the counteractive triplet-triplet annihilation and vibrational deactivation faced by low bandgap phosphorescent emitters, aggregation-induced phosphorescent enhancement (AIPE)-active deep-red and NIR emissive iridium(iii) complexes are designed by suitably anchoring electron-withdrawing substituents such as -phenyl (Ir2), -ethyl ester (Ir3), and -trifluoromethyl (Ir4) groups on the N-coordinating quinoline moiety of a (benzo[b]thiophen-2-yl)quinoline cyclometalated ligand along with ancillary picolinate. The fundamentals of the origin of AIPE on Ir2 and Ir4 and its associated excited-state properties are deeply studied through comparison with unsubstituted Ir1 with the help of density functional theory and single-crystal X-ray diffraction analysis. Most importantly, AIPE-active Ir2 is employed for the development of efficient deep-red and NIR PhOLEDs by hybrid solution-processable methods, in which the AIPE effect of Ir2 reaches a maximum external quantum efficiency (EQE) of 7.29% at high doping ratios.
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