期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 13, 期 32, 页码 7561-7567出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c01745
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资金
- National Natural Science Foundation of China [21772209]
- National Program for Support of Top-notch Young Professionals
In this study, a novel type of TADF emitter based on rigid sulfur/oxygen-bridged triarylboron acceptor was designed and synthesized to achieve ultrapure blue narrowband electroluminescence. The emitters exhibited deep-blue emission with a small energy gap, and OLEDs based on them showed high external quantum efficiencies.
Organic light-emitting diodes (OLEDs) still face a significant challenge in finding blue thermally activated delayed fluorescence (TADF) emitters that can achieve narrowband emission and high efficiency. In this work, we successfully design and synthesize a novel kind of TADF emitters based on rigid sulfur/oxygen-bridged triarylboron acceptor for ultrapure blue with narrowband electroluminescence. Time-dependent density functional theory (TD-DFT) calculations and photophysical results indicate the different intramolecular charge-transfer (ICT) character of two emitters. Benefiting from the rigid aromatic framework, both emitters exhibited deep-blue emission at 444 and 447 nm with a small full-width at half-maximum (fwhm) of about 33 nm, and a small singlet (S-1)-triplet (T-1) energy gap (delta EST) of 0.23 and 0.36 eV. Consequently, OLEDs based on PhCz-TOSBA and TPA-TOSBA exhibit deep blue electroluminescence at 456 nm with fwhm of about 55 nm, affording high external quantum efficiencies (EQEs) of 16.69% with CIE coordinates of (0.14, 0.15) and 16.65% with CIE coordinates of (0.14, 0.12), respectively. These findings show that PhCz-TOSBA and TPA-TOSBA are superior emitters in ultrapure blue TADF devices.
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