Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 16, Issue 16, Pages 2328-2337Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.202100559
Keywords
phenanthro[9,10-d]imidazole; spiro[acridine-9,9'fluorene]; ultra-deep blue emission; hybridized local and charge transfer; organic light-emitting diode
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Funding
- Thailand Research Fund [RTA6080005]
- National Nanotechnology Center, National Science and Technology Development Agency, Ministry of Higher Education, Science, Research and Innovation, Thailand, through its program of Research Network National Nanotechnology Center
- Vidyasirimedhi Institute of Science and Technology
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Two deep-blue emissive molecules (SAF-PI and SAF-DPI) designed and synthesized with twisted D-A and A-D-A structures exhibit hybridized local excited and charge transfer characteristics, suitable for use as non-doped emitters in OLEDs. SAF-PI, in particular, achieves high-definition television standard blue emission with peak wavelength at 428 nm and excellent external quantum efficiency.
Herein, two deep-blue emissive molecules (SAF-PI and SAF-DPI) are designed and synthesized using spiro[acridine-9,9'-fluorene] as a donor (D) substituted with 2-(3-methylphenyl)-1-phenyl-phenanthro[9,10-d]imidazole as an acceptor (A), forming twisted D-A and A-D-A structures, respectively. The photophysical studies and density functional theory (DFT) calculations reveal that both molecules exhibit hybridized local excited and charge transfer (HLCT) characteristics with deep blue emission color. They are effectively applied as non-doped emitters in OLEDs. Particularly, SAF-PI-based device achieves the high-definition television (HDTV) standard blue color emission peaked at 428 nm with CIE coordinate of (0.156, 0.053), a narrow full width at half maximum of 55 nm, a maximum external quantum efficiency (EQE(max)) of 4.57% and an exciton utilization efficiency of 65%.
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