Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 17, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.202200266
Keywords
blue fluorophore; electroluminescent device; excited-state intramolecular proton transfer; hybridized local and charge-transfer; hydroxy-tetraphenylimidazole
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Funding
- National Research Council of Thailand (NRCT) [N42 A650196]
- National Nanotechnology Center (Nanotec), National Science and Technology Development Agency, Ministry of Higher Education, Science, Research and Innovation, Thailand, through its program of Research Network National Nanotechnology Center
- VISTEC
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In this study, three hydroxy-tetraphenylimidazole-based fluorophores were designed and synthesized, exhibiting different photophysical properties and emission colors. These fluorophores showed promising performance in organic light-emitting diodes.
Herein, three hydroxy-tetraphenylimidazole (HPI)-based fluorophores (HPI-TPA, HPI-PCz, and HPI-CzP) are designed and synthesized by disubstituted HPI core with arylamine units of triphenylamine (TPA), phenyl carbazole (PCz), and carbazole phenyl (CzP) at 3,5-positions of the N-phenyl ring of HPI, respectively. Their photophysical properties are theoretically and experimentally examined. HPI-TPA shows a hybridized local and charge transfer (HLCT) excited state characteristic and emits deep blue color via an HLCT mechanism, while both HPI-PCz and HPI-CzP exhibit excited-state intramolecular proton transfer (ESIPT) property and display pure keto form emissions. They possess high thermal stability and are successfully fabricated as emitters in organic light-emitting diodes (OLEDs). All devices exhibit intense blue color emissions with low turn-on voltages (3.5-3.7 V). Particularly, HPI-TPA-based OLED emits light in the deep-blue region with a high maximum external quantum efficiency (EQE(max)) of 3.77% and a decent efficiency roll-off.
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