Open AccessInsights into enhanced electrochemiluminescence of a multiresonance thermally activated delayed fluorescence molecule
Author(s) -
Yang Liuqing,
Dong Lihui,
Hall David,
Hesari Mahdi,
Olivier Yoann,
ZysmanColman Eli,
Ding Zhifeng
Publication year - 2023
Publication title -
smartmat
Language(s) - English
Resource type - Journals
ISSN - 2688-819X
DOI - 10.1002/smm2.1149
Subject(s) - electrochemiluminescence , fluorescence , annihilation , molecule , photochemistry , materials science , electrode , optoelectronics , analytical chemistry (journal) , chemistry , physics , optics , organic chemistry , quantum mechanics , chromatography
The electrochemiluminescence (ECL) behavior of a multiresonance thermally activated delayed fluorescence molecule has been investigated for the first time by means of ECL‐voltage curves, newly designed ECL‐time observatory, and ECL spectroscopy. The compound, Mes 3 DiKTa , shows complex ECL behavior, including a delayed onset time of 5 ms for ECL generation in both the annihilation pathway and the coreactant route, which we attribute to organic long‐persistent ECL (OLECL). Triplet‐triplet annihilation, thermally activated delayed fluorescence and uncompensated solution resistance cannot be ruled out as contributing mechanisms to the ECL. A very long ECL emission decay was attributed to OLECL as well. The absolute ECL efficiencies of Mes 3 DiKTa were enhanced and reached 0.0013% in annihilation route and 1.1% for the coreactant system, which are superior to those of most other organic ECL materials. It is plausible that ECL materials with comparable behavior as Mes 3 DiKTa are desirable in applications such as ECL sensing, imaging, and light‐emitting devices.