An efficient aggregation-enhanced delayed fluorescence luminogen created with spiro donors and carbonyl acceptor for applications as an emitter and sensitizer in high-performance organic light-emitting diodes,Aggregate

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An efficient aggregation-enhanced delayed fluorescence luminogen created with spiro donors and carbonyl acceptor for applications as an emitter and sensitizer in high-performance organic light-emitting diodes
Aggregate ( IF 13.9 ) Pub Date : 2022-06-02 , DOI: 10.1002/agt2.244
Hao Chen ₁ , Jiajie Zeng ₁ , Ruishan Huang ₁ , Jianghui Wang ₁ , Junchu He ₁ , Hao Liu ₁ , Dezhi Yang ₁ , Dongge Ma ₁ , Zujin Zhao ₁ , Ben Zhong Tang _{1,

2,

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Affiliation

Organic light-emitting diodes (OLEDs) fabricated using organic thermally activated delayed fluorescence materials as sensitizers have recently achieved significant advancements, but the serious efficiency roll-offs are still troublesome in most cases. Herein, a tailor-made multifunctional luminogen SBF-BP-SFAC containing 9,9′-spirobifluorene (SBF) and spiro[acridine-9,9-fluorene] (SFAC) as electron donors and carbonyl as an electron acceptor is synthesized and characterized. SBF-BP-SFAC has the advantages of high thermal stability, aggregation-enhanced delayed fluorescence, and balanced carrier transport ability, and prefers horizontal dipole orientation. Highly efficient OLEDs employing SBF-BP-SFAC as an emitter radiate intense cyan light with outstanding external quantum efficiencies (η_exts) of up to 30.6%. SBF-BP-SFAC can also serve as an excellent sensitizer for orange fluorescence, phosphorescence, and delayed fluorescence materials, providing excellent η_exts of up to 30.3% with very small efficiency roll-offs due to the fast Förster energy transfer as well as exciton annihilation suppression by bulky spiro donors. These outstanding performances demonstrate the great potential of SBF-BP-SFAC as an emitter and sensitizer for OLEDs.

中文翻译：

一种高效的聚集增强型延迟荧光发光体，由螺供体和羰基受体制成，可用作高性能有机发光二极管中的发射体和敏化剂

使用有机热激活延迟荧光材料作为敏化剂制造的有机发光二极管 (OLED) 最近取得了重大进展，但在大多数情况下严重的效率下降仍然是个问题。在此，合成并表征了含有 9,9'-螺二芴 (SBF) 和螺[吖啶-9,9-芴] (SFAC) 作为电子供体和羰基作为电子受体的定制多功能发光剂 SBF-BP-SFAC . SBF-BP-SFAC具有热稳定性高、聚集增强延迟荧光、平衡载流子传输能力等优点，更倾向于水平偶极取向。采用 SBF-BP-SFAC 作为发射体的高效 OLED 辐射强烈的青色光，具有出色的外部量子效率 ( η _exts) 高达 30.6%。SBF-BP-SFAC 还可以作为橙色荧光、磷光和延迟荧光材料的出色敏化剂，提供高达 30.3% 的出色η _ext s，由于快速的 Förster 能量转移以及庞大的螺供体抑制激子湮灭。这些出色的性能证明了 SBF-BP-SFAC 作为 OLED 的发射体和敏化剂的巨大潜力。

更新日期：2022-06-02

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