Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 49, Pages 59035-59042Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c18704
Keywords
thermally activated delayed fluorescence; organic light-emitting diodes; multiresonance; narrowband emission; peripheral decoration
Funding
- National Natural Science Foundation of China [21805195, 52130308]
- Shenzhen Science and Technology Program [KQTD20170330110107046, JCYJ20180507182244027]
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Developing organic thermally activated delayed fluorescence (TADF) emitters with high efficiency and narrowband emissions is crucial for high-quality organic light-emitting diodes (OLEDs). Three multiresonance TADF emitters DPACzBN1, DPACzBN2, and DPACzBN3 were designed and synthesized, with DPACzBN3 achieving the highest maximum external quantum efficiency of 27.7% and the smallest fwhm of 24 nm among the three emitters due to its excellent TADF properties and good inhibition of spectral broadening.
Developing organic thermally activated delayed fluorescence (TADF) emitters with high efficiency and narrowband emissions is crucial and challenging for high-quality organic light-emitting diodes (OLEDs). Here, three multiresonance TADF emitters DPACzBN1, DPACzBN2, and DPACzBN3 are designed via a peripheral decoration strategy and synthesized through a lithium intermediate cascade borylation reaction (15% yield for DPACzBN1) or a more efficient lithium-free direct borylation reaction (45% yield for DPACzBN2 and 75% yield for DPACzBN3). All the emitters exhibit a similar blue emission with small full-width at half maximum (fwhm) values as low as 20 nm in toluene solutions. The introduction of the diphenylamino moiety into the parent molecule DPACzBN1 can not only maintain the high photoluminescence quantum yields over 90% but also narrow the bandwidth and enhance the rate constant of the reverse intersystem crossing process, as well as suppress the spectral broadening in devices. Benefiting from the excellent TADF properties and good inhibition of spectral broadening, TADF OLEDs based on DPACzBN3 achieve the highest maximum external quantum efficiency of 27.7% and the smallest fwhm of 24 nm among the three emitters.
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