Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 2, Pages 2717-2723Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b17585
Keywords
organic electronics; nondoped; organic light-emitting diodes; thermally activated delayed fluorescence; molecular orientation
Funding
- National Key R&D Program of China [2016YFB0401004]
- National Natural Science Foundation of China [91833304, 51625301, U1601651, 51573059]
- 973 Project [2015CB655003]
- Guangdong Provincial Department of Science and Technology [2016B090906003, 2016TX03C175, 2019A1515012059]
- China Postdoctoral Science Foundation [2019M662903]
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A pivotal thermally activated delayed-fluorescence (TADF) emitter, DspiroAc-TRZ, was developed, and it exhibits greatly enhanced electroluminescence performance in nondoped organic light-emitting diodes (OLEDs) owing to the concurrent manipulation of aggregation behavior and monomolecular structure. The delicate non-planar packing pattern in the DspiroAc-TRZ crystal can not only lead to highly efficient solid-state luminescence but also form a loose intermolecular packing pattern, greatly decreasing the HOMO or LUMO overlaps in dimers and shortening the triplet exciton diffusion length. In addition, the rigid donor and acceptor moieties in DspiroAc-TRZ can rigidify the molecular backbone, resulting in a tiny geometric vibrational relaxation in the excited state. Impressively, high photoluminescent quantum yields of 78.5 and 83.7% were achieved for the DspiroAc-TRZ single crystal and nondoped film. A high external quantum efficiency (EQE) of 25.7% was achieved in a nondoped sky-blue TADF OLED, which is higher than any reported EQE value of nondoped sky-blue TADF OLEDs so far.
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