Spiro[Acridine-Indoloacridine] Donor Based TADF Emitter with Near-Unity PLQY and Horizontal Dipole Orientation toward High-Efficiency OLEDs with Low Efficiency Roll-Off,Advanced Optical Materials

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Spiro[Acridine-Indoloacridine] Donor Based TADF Emitter with Near-Unity PLQY and Horizontal Dipole Orientation toward High-Efficiency OLEDs with Low Efficiency Roll-Off
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2023-11-22 , DOI: 10.1002/adom.202301954
Yaxun Wu _{1,

2} , Nengquan Li ₃ , Fan Ni ₂ , Weimin Ning ₁ , Ao Ying ₁ , He Zhang ₁ , Xiang Gao ₄ , Shaolong Gong ₁ , Chuluo Yang _{1,

3}

Affiliation

Designing thermally activated delayed fluorescence (TADF) emitters with excellent photoluminescence quantum yield (PLQY), preferential horizontal emitting dipole orientation (𝛩_//), and fascinating ability to rapidly utilize both singlet and triplet excitons for radiation is crucial for high-performance organic light-emitting diodes (OLEDs) with both high efficiency and relieved efficiency roll-off. Integrating these advantages into a single TADF emitter is a formidable challenge. In this work, a spiro[acridine-indoloacridine]-based rigid donor, named AIA, is designed to establish a cooperatively long-axis extended and conjugation expanded donor–acceptor type TADF emitter (AIA-TRZ). The proof-of-the-concept emitter simultaneously achieves an excellent PLQY of 99%, a near-unity 𝛩_// of 99%, and balanced excited state dynamic parameters. OLEDs based on AIA-TRZ realize remarkable performance with an emission peak at around 480 nm, including doping concentration insensitivity, a maximum external quantum efficiency (EQE_max) of 37.3%, extremely low efficiency roll-off, and over 20% EQE even at 14000 cd m⁻².

中文翻译：

基于 Spiro[吖啶-吲哚吖啶] 供体的 TADF 发射器，具有接近一致的 PLQY 和水平偶极子取向，可实现低效率滚降的高效 OLED

设计具有优异光致发光量子产率 (PLQY)、优先水平发射偶极子取向 (𝛩 _// ) 以及快速利用单线态和三线态激子进行辐射的令人着迷的能力的热激活延迟荧光 (TADF) 发射器对于高性能有机光至关重要具有高效率和缓解的效率滚降的发光二极管（OLED）。将这些优势集成到单个 TADF 发射器中是一项艰巨的挑战。在这项工作中，设计了一种基于螺[吖啶-吲哚吖啶]的刚性供体，称为AIA，旨在建立合作的长轴延伸和共轭扩展供体-受体型TADF发射器（AIA-TRZ）。概念验证发射器同时实现了 99% 的出色 PLQY、99% 的近乎一致的 𝛩 _//以及平衡的激发态动态参数。基于AIA-TRZ的OLED实现了卓越的性能，发射峰值在480 nm左右，包括掺杂浓度不敏感、最大外量子效率(EQE _max )为37.3%、极低的效率滚降以及超过20%的EQE，即使在14000cd·m ^-2。

更新日期：2023-11-22

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