Unknown

Dataset Information

0

Thermally Activated and Aggregation-Regulated Excitonic Coupling Enable Emissive High-Lying Triplet Excitons.


ABSTRACT: Room-temperature phosphorescence (RTP) originating from higher-lying triplet excitons remains a rather rarely documented occurrence for purely organic molecular systems. Here, we report two naphthalene-based RTP luminophores whose phosphorescence emission is enabled by radiative decay of high-lying triplet excitons. In contrast, upon cooling the dominant phosphorescence originates from the lowest-lying triplet excited state, which is manifested by a red-shifted emission. Photophysical and theoretical studies reveal that the unusual RTP results from thermally activated excitonic coupling between different conformations of the compounds. Aggregation-regulated excitonic coupling is observed when increasing the doping concentration of the emitters in poly(methylmethacrylate) (PMMA). Further, the RTP quantum efficiency improves more than 80-fold in 1,3-bis(N-carbazolyl)benzene (mCP) compared to that in PMMA. This design principle offers important insight into triplet excited state dynamics and has been exploited in afterglow-indicating temperature sensing.

SUBMITTER: Wang T 

PROVIDER: S-EPMC9545188 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature

altmetric image

Publications

Thermally Activated and Aggregation-Regulated Excitonic Coupling Enable Emissive High-Lying Triplet Excitons.

Wang Tao T   De Joydip J   Wu Sen S   Gupta Abhishek Kumar AK   Zysman-Colman Eli E  

Angewandte Chemie (International ed. in English) 20220704 33


Room-temperature phosphorescence (RTP) originating from higher-lying triplet excitons remains a rather rarely documented occurrence for purely organic molecular systems. Here, we report two naphthalene-based RTP luminophores whose phosphorescence emission is enabled by radiative decay of high-lying triplet excitons. In contrast, upon cooling the dominant phosphorescence originates from the lowest-lying triplet excited state, which is manifested by a red-shifted emission. Photophysical and theore  ...[more]

Similar Datasets

| S-EPMC9880999 | biostudies-literature
| S-EPMC6363735 | biostudies-literature
| S-EPMC7067247 | biostudies-literature
| S-EPMC8456236 | biostudies-literature
| S-EPMC8154526 | biostudies-literature
| S-EPMC11377787 | biostudies-literature
| S-EPMC9060479 | biostudies-literature
| S-EPMC6175341 | biostudies-literature
| S-EPMC3644086 | biostudies-other
| S-EPMC6472266 | biostudies-literature