Efficient Triplet Harvesting Via Hot Exciton Utilization in Solution Processed OLEDs Employing Tetraphenyl Buta-1,3-Diene Based AIE Emitters

Ayan Datta,Susmita Mukherjee,Prasanta Pal,Arun K. Pal,Ajay Perumal,Sudip Malik

Advanced Optical Materials（2024）SCI 2区

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Abstract

High photoluminescence quantum yield (PLQY) especially in solid-state together with harvesting radiative triplet excitons are essential to achieve efficient organic light-emitting diodes (OLEDs). Herein, the aggregation induced emission (AIE) active tetraphenyl buta-1,3-diene (TPB) moiety has been employed and tactfully modified to obtain orthogonally oriented donor-acceptor (D-A-pi-A-D) type derivatives (namely, TPB-CHO-TPA and TPB-CN-TPA) which possess additionally the hybridized local and charge transfer (HLCT) type excited-state. Moreover, computational studies have revealed the possibility of triplet harvesting through hot exciton mechanism in these designed emitters. These key features along with excellent solubility in most of the organic solvents have encouraged to utilize these as light emitting materials for solution processed non-doped and doped OLED devices. The optimal OLED device using TPB-CHO-TPA exhibits yellow light emission (ELmax = 572 nm and CIEx,y = 0.48, 0.51) having maximum external quantum efficiency (EQEmax) of 7.6% with power and current efficiency of 6.1 lm W-1 and 8.9 cd A-1 where the calculated exciton utilization efficiency (EUE) approaches to 97%, indicating efficient triplet harvesting in electroluminescence process. This work signifies a novel design strategy for AIE-based HLCT type emitters having efficient hot exciton utilization which can pave the way for future development of TPB based highly efficient OLED devices. Tetraphenylbuta-1,3-diene based new AIEgens (TPB-CN-TPA and TPB-CHO-TPA) with orthogonal orientation of donors and acceptors are developed. Their key features such as hybridized local and charge transfer (HLCT) state, triplet harvesting capacity via hot exciton utilization, and excellent solubility in common organic solvents have assisted in achieving outstanding electroluminescence performance in the solution-processed organic light-emitting diodes (OLEDs). image

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Key words

aggregation induced emission,hot exciton utilization,hybridized local and charge transfer state,organic light emitting diode,solution processability

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【要点】：研究开发了一种基于四苯基丁二烯基团的聚集诱导发光(AIE)材料，通过利用热激子机制实现了高效的电致发光性能和 triplet 激子收集效率，为高效有机发光二极管(OLEDs)提供了新设计策略。

【方法】：通过在四苯基丁二烯(TPB)基团上引入特定的官能团，合成了具有正交取向供体-受体(D-A-pi-A-D)结构的衍生物(TPB-CHO-TPA和TPB-CN-TPA)，并计算研究了其热激子机制。

【实验】：在溶液处理的非掺杂和掺杂OLED设备中使用了这些发光材料，最优的OLED设备采用TPB-CHO-TPA作为发光材料，表现出黄色发光(ELmax = 572 nm, CIEx,y = 0.48, 0.51)，最高外部量子效率(EQEmax)达到7.6%，功率和电流效率分别为6.1 lm W-1和8.9 cd A-1，计算出的激子利用效率(EUE)接近97%，表明在电致发光过程中实现了高效的三重态激子收集。实验使用了特定的数据集，但论文中未明确提及数据集名称。