Department of Chemistry, Western University, London, ON N6A 5B7, Canada.
Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, U.K.
Langmuir. 2023 Feb 21;39(7):2829-2837. doi: 10.1021/acs.langmuir.2c03391. Epub 2023 Feb 10.
The electrochemistry, electrochemiluminescence (ECL), and chemiluminescence (CL) properties of a thermally activated delayed fluorescence (TADF) emitter 4,4'-(1,2-dihydroacenaphthylene-5,6-diyl)bis(,-diphenylaniline) (TPA-ace-TRZ) and three of its analogues were investigated. TPA-ace-TRZ exhibits both (a) delayed onset of ECL and (b) long-persistent luminescence, which we have attributed to the formation of an aggregate excited state in excimer or exciplex form. The evidence of this aggregate excited state was consistent across ECL annihilation and coreactant pathways as well as in CL. The absolute ECL efficiency of TPA-ace-TRZ using benzoyl peroxide (BPO) as a coreactant was found to be 0.028%, which was 9-fold stronger than the [Ru(bpy)]/BPO reference coereactant system. Furthermore, the absolute CL quantum efficiency of TPA-ace-TRZ was determined to be 0.92%. The performance and flexibility of the TADF emitter TPA-ace-TRZ under these various emissive pathways are highly desirable toward applications in sensing, imaging, and light-emitting devices.
研究了热激活延迟荧光（TADF）发射器 4,4'-(1,2-二氢苊-5,6-二基)双(-二苯基苯胺)（TPA-ace-TRZ）及其三种类似物的电化学、电化学发光（ECL）和化学发光（CL）性质。TPA-ace-TRZ 表现出（a）ECL 的延迟起始和（b）长持续发光，我们将其归因于激基缔合物或激基复合物形式的聚集激发态的形成。这种聚集激发态的证据在 ECL 湮灭和共反应物途径以及 CL 中是一致的。使用过氧化二苯甲酰（BPO）作为共反应物时，TPA-ace-TRZ 的绝对 ECL 效率被发现为 0.028%，比 [Ru(bpy)]/BPO 参考共反应物体系强 9 倍。此外，TPA-ace-TRZ 的绝对 CL 量子效率被确定为 0.92%。在这些各种发射途径下，TADF 发射器 TPA-ace-TRZ 的性能和灵活性非常适合在传感、成像和发光器件中的应用。
