期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 9, 期 26, 页码 8308-8313出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1tc01427g
关键词
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资金
- Center of Innovation (COI) Program of the Japan Science and Technology Agency, JST
- JSPS KAKENHI [17H03131, 20H02807]
- Grants-in-Aid for Scientific Research [20H02807, 17H03131] Funding Source: KAKEN
The study developed two highly efficient green-emitting MR-TADF emitters, DMAc-BN and PXZ-BN, using a one-pot borylation method. These emitters exhibited high external quantum efficiencies and small full width at half maximum values in OLEDs. The design successfully addressed aggregation-induced quenching issues faced by MR-TADF emitters in the past.
High color-purity emission with a minimum full width at half maximum (FWHM) is critical for high-resolution displays. Despite the increasing demand for narrow-band emission materials with multi-resonance-induced thermally activated delayed fluorescence (MR-TADF), their development remains challenging from the viewpoint of synthetic chemistry. In this study, we developed a novel one-pot borylation method that does not require the use of hazardous tert-BuLi, and for which the starting materials are not limited to aromatic fluorides and carbazole-based materials. We achieved this by making simple modifications to a boron-nitrogen skeleton. By inserting carbon and oxygen into the skeleton, we created two types of highly efficient green-emitting MR-TADF emitters, namely DMAc-BN and PXZ-BN. This design enabled the suppression of aggregation-induced quenching, which was one of the major challenges faced by MR-TADF emitters developed in the past. OLEDs using our DMAc-BN and PXZ-BN emitters exhibited external quantum efficiencies of 20.3% and 23.3%, respectively, with FWHM values of 49 and 47 nm, respectively. PXZ-BN exhibited pure green emission with CIE coordinates of (0.22, 0.67).
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