具有分子内能量转移的多共振热激活延迟荧光树状大分子：用于高效无宿主绿色溶液处理有机发光二极管

IF 27.4 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Materials Pub Date : 2025-01-09 DOI:10.1002/adma.202415289

Sen Wu, Dongyang Chen, Xiao‐Hong Zhang, Dianming Sun, Eli Zysman‐Colman

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引用次数: 0

摘要

窄带发光，明亮，稳定的溶液处理有机发光二极管（SP - oled）的发展仍然是一个挑战。本文提出了一种策略，该策略将负责激子捕获的TADF敏化剂和提供明亮窄带发射的MR - TADF基序合并在单个发射器内。这种发射极设计还显示出很强的抗聚集形成和聚集引起的猝灭能力。它基于已知的MR - TADF发射体DtBuCzB，其供体-受体TADF片段由叔丁基咔唑供体（tBuCzCO2HDCzB）或第二代咔唑供体树突（2GtBuCzCO2HDCzB）和苯甲酸盐受体组成。TADF片段充当激子收集天线，并通过Förster共振能量转移将这些激子转移到MR - TADF发射核心。因此，具有2GtBuCzCO2HDCzB和tBuCzCO2HDCzB的SP‐oled具有非常高的最大外部量子效率（EQEmax分别为27.9%和22.0%）和最小效率滚转到5000 cd m−2。

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A Multiresonant Thermally Activated Delayed Fluorescent Dendrimer with Intramolecular Energy Transfer: Application for Efficient Host‐Free Green Solution‐Processed Organic Light‐emitting Diodes

The development of narrowband emissive, bright, and stable solution‐processed organic light‐emitting diodes (SP‐OLEDs) remains a challenge. Here, a strategy is presented that merges within a single emitter a TADF sensitizer responsible for exciton harvesting and an MR‐TADF motif that provides bright and narrowband emission. This emitter design also shows strong resistance to aggregate formation and aggregation‐cause quenching. It is based on a known MR‐TADF emitter DtBuCzB with a donor‐acceptor TADF moiety consisting of either tert‐butylcarbazole donors (tBuCzCO2HDCzB) or second‐generation carbazole‐based donor dendrons (2GtBuCzCO2HDCzB) and a benzoate acceptor. The TADF moiety acts as an exciton harvesting antenna and transfers these excitons via Förster resonance energy transfer to the MR‐TADF emissive core. The SP‐OLEDs with 2GtBuCzCO2HDCzB and tBuCzCO2HDCzB thus show very high maximum external quantum efficiencies (EQEmax of 27.9 and 22.0%) and minimal efficiency roll‐off out to 5000 cd m−2.

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来源期刊

Advanced Materials 工程技术-材料科学：综合

CiteScore

43.00

自引率

4.10%

发文量

2182

审稿时长

2 months

期刊介绍： Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.