通过三维分子工程构建高效橙红色热激活延迟荧光发射器。

Constructing high-efficiency orange-red thermally activated delayed fluorescence emitters by three-dimension molecular engineering.

机构信息

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.

Beijing Advanced Innovation Centre for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.

出版信息

Nat Commun. 2022 Dec 19;13(1):7828. doi: 10.1038/s41467-022-35591-w.

Preparing high-efficiency solution-processable orange-red thermally activated delayed fluorescence (TADF) emitters remains challenging. Herein, we design a series of emitters consisting of trinaphtho[3,3,3]propellane (TNP) core derivatized with different TADF units. Benefiting from the unique hexagonal stacking architecture of TNPs, TADF units are thus kept in the cavities between two TNPs, which decrease concentration quenching and annihilation of long-lived triplet excitons. According to the molecular engineering of TADF and host units, the excited states can further be regulated to effectively enhance spin-orbit coupling (SOC) processes. We observe a high-efficiency orange-red emission at 604 nm in one instance with high SOC value of 0.862 cm and high photoluminescence quantum yield of 70.9%. Solution-processable organic light-emitting diodes exhibit a maximum external quantum efficiency of 24.74%. This study provides a universal strategy for designing high-performance TADF emitters through molecular packing and excited state regulation.

制备高效溶液处理的橙红色热激活延迟荧光（TADF）发射器仍然具有挑战性。在此，我们设计了一系列由三萘并[3,3,3]丙烷（TNP）核心衍生的发射器，该核心带有不同的 TADF 单元。得益于 TNPs 的独特六方堆积结构，TADF 单元被保持在两个 TNPs 之间的腔体内，从而减少了浓度猝灭和长寿命三重态激子的湮灭。根据 TADF 和主体单元的分子工程，可以进一步调节激发态，以有效增强自旋轨道耦合（SOC）过程。在一个实例中，我们观察到了高效率的橙红色发射，其 SOC 值高达 0.862 cm，光致发光量子产率高达 70.9%。溶液处理的有机发光二极管表现出 24.74%的最大外量子效率。这项研究通过分子堆积和激发态调节为设计高性能 TADF 发射器提供了一种通用策略。