Highly Efficient Thermally Activated Delayed Fluorescence from an Excited-State Intramolecular Proton Transfer System,ACS Central Science

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Highly Efficient Thermally Activated Delayed Fluorescence from an Excited-State Intramolecular Proton Transfer System
ACS Central Science ( IF 12.7 ) Pub Date : 2017-07-07 00:00:00 , DOI: 10.1021/acscentsci.7b00183
Masashi Mamada ₁ , Ko Inada ₁ , Takeshi Komino ₁ , William J. Potscavage ₁ , Hajime Nakanotani ₁ , Chihaya Adachi ₁

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Thermally activated delayed fluorescence (TADF) materials have shown great potential for highly efficient organic light-emitting diodes (OLEDs). While the current molecular design of TADF materials primarily focuses on combining donor and acceptor units, we present a novel system based on the use of excited-state intramolecular proton transfer (ESIPT) to achieve efficient TADF without relying on the well-established donor–acceptor scheme. In an appropriately designed acridone-based compound with intramolecular hydrogen bonding, ESIPT leads to separation of the highest occupied and lowest unoccupied molecular orbitals, resulting in TADF emission with a photoluminescence quantum yield of nearly 60%. High external electroluminescence quantum efficiencies of up to 14% in OLEDs using this emitter prove that efficient triplet harvesting is possible with ESIPT-based TADF materials. This work will expand and accelerate the development of a wide variety of TADF materials for high performance OLEDs.

中文翻译：

激发态分子内质子转移系统的高效热活化延迟荧光

热激活延迟荧光（TADF）材料在高效有机发光二极管（OLED）方面显示出巨大潜力。尽管当前TADF材料的分子设计主要集中在结合供体和受体单元，但我们提出了一种基于使用激发态分子内质子转移（ESIPT）来实现有效TADF的新型系统，而无需依赖完善的供体-受体方案。在具有分子内氢键的适当设计的基于cri啶酮的化合物中，ESIPT导致最高占据和最低未占据分子轨道的分离，从而导致TADF发射，其光致发光量子产率接近60％。使用此发射器的OLED中高达14％的高外部电致发光量子效率证明，使用基于ESIPT的TADF材料可以进行有效的三重态收获。这项工作将扩大和加速用于高性能OLED的多种TADF材料的开发。

更新日期：2017-07-28

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