Ubiquitous Aluminum(III)-TADF Complex as Sensitizer for Highly Efficient Solution-Processed Hyperfluorescent OLEDs with Narrow Emission,Advanced Optical Materials

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Ubiquitous Aluminum(III)-TADF Complex as Sensitizer for Highly Efficient Solution-Processed Hyperfluorescent OLEDs with Narrow Emission
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2024-02-24 , DOI: 10.1002/adom.202303303
Keigo Hoshi ₁ , Hisahiro Sasabe _{1,

2,

3} , Yudai Chiba ₁ , Naoto Yoshida ₁ , Takeru Nakamura ₁ , Keisuke Nagasawa ₁ , Yuya Sayama ₁ , Hiroshi Katagiri _{1,

2,

3} , Junji Kido _{1,

2,

3}

Affiliation

Although Earth-abundant, ubiquitous, metal-based thermally activated delayed fluorescence (TADF) complexes are among the most promising candidate materials for next-generation organic light-emitting devices (OLEDs), few complexes are explored. Herein, a highly emissive aluminum(III)-TADF complex—Al(MCzDBM)₃—with three β-diketone ligands is presented as a sensitizer for multiresonance (MR)-TADF emitters. This complex exhibited green emission with suitable photophysical functions as a sensitizer, such as a high photoluminescent quantum yield (PLQY) of up to 97% with reduced aggregation-caused quenching, a high radiative rate constant (k_r) of 5.6 × 10⁷ s⁻¹, and a short delayed lifetime (τ_d) of 4.0 µs in the solid state. A solution-processed Al(MCzDBM)₃-based OLED exhibited an external quantum efficiency (EQE) of 23.6%. This complex sensitized a yellow MR-TADF emitter, yielding a near-unity PLQY, and is used to fabricate a solution-processed hyperfluorescent OLED with an EQE of 21.6% and full width at half maximum of 45 nm.

中文翻译：

普遍存在的铝 (III)-TADF 络合物作为高效溶液加工窄发射超荧光 OLED 的敏化剂

尽管地球上丰富、无处不在的金属基热激活延迟荧光（TADF）配合物是下一代有机发光器件（OLED）最有前途的候选材料之一，但对配合物的探索却很少。在此，提出了一种具有三个 β-二酮配体的高发射性铝 (III)-TADF 络合物 - Al(MCzDBM) ₃ - 作为多共振 (MR)-TADF 发射器的敏化剂。该配合物表现出绿光发射，具有适合作为敏化剂的光物理功能，例如高达 97% 的高光致发光量子产率 (PLQY)，并减少聚集引起的猝灭、高辐射速率常数 (k _r ) 5.6 × 10 ⁷ s ⁻¹ ，固态延迟寿命 (τ _d ) 为 4.0 µs。溶液加工的Al(MCzDBM) ₃ 基OLED表现出23.6%的外量子效率(EQE)。该复合物使黄色 MR-TADF 发射体敏化，产生接近一致的 PLQY，并用于制造溶液处理的超荧光 OLED，其 EQE 为 21.6%，半峰全宽为 45 nm。

更新日期：2024-02-24

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