Synthesis and Electrochemiluminescence of a Di-Boron Thermally Activated Delayed Fluorescence Emitter
Recent advances in electrochemiluminescence (ECL) leveraging thermally activated delayed fluorescence (TADF) have highlighted its potential for near-unity exciton harvesting. However, there are still very limited examples of TADF-ECL emitters. We present a rigid diboron-embedded multiple-resonance T...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-04-01
|
| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/30/8/1718 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850144556018827264 |
|---|---|
| author | Xiaojie Zhou Jun Cheng Hongbo Wang |
| author_facet | Xiaojie Zhou Jun Cheng Hongbo Wang |
| author_sort | Xiaojie Zhou |
| collection | DOAJ |
| description | Recent advances in electrochemiluminescence (ECL) leveraging thermally activated delayed fluorescence (TADF) have highlighted its potential for near-unity exciton harvesting. However, there are still very limited examples of TADF-ECL emitters. We present a rigid diboron-embedded multiple-resonance TADF emitter, which exhibits blue–green emission at 493 nm with a remarkably narrow bandwidth (FWHM = 22 nm) and minimized singlet-triplet energy gap (ΔE<sub>ST</sub> = 0.2 eV), achieving a 67% photoluminescence quantum yield. DFT calculations confirm the short-range charge transfer, enabling narrowband emission. Co-reactant-dependent ECL shows that tripropylamine (TPrA) improves the ECL efficiency from 11% (annihilation) to 51%, while benzoyl peroxide (BPO) yields 1% due to poor radical stabilization. ECL spectra align with photoluminescence, confirming the singlet-state dominance without exciplex interference. TPrA enhances stable radical formation and energy transfer, whereas BPO induces non-radiative losses. These findings establish molecular rigidity and co-reactant selection as pivotal factors in developing high-performance TADF-ECL systems, providing fundamental guidelines for designing organic electrochemiluminescent materials with optimized exciton harvesting efficiency. |
| format | Article |
| id | doaj-art-ee7aef320fd04fd1b9bf4726b4f05824 |
| institution | OA Journals |
| issn | 1420-3049 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj-art-ee7aef320fd04fd1b9bf4726b4f058242025-08-20T02:28:19ZengMDPI AGMolecules1420-30492025-04-01308171810.3390/molecules30081718Synthesis and Electrochemiluminescence of a Di-Boron Thermally Activated Delayed Fluorescence EmitterXiaojie Zhou0Jun Cheng1Hongbo Wang2Key Laboratory of Flexible Optoelectronic Materials and Technology (Ministry of Education), Center for International Cooperation and Disciplinary Innovation in Sustainable Chemical Engineering, School of Optoelectronic Materials and Technology, Jianghan University, Wuhan 430056, ChinaDepartment of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, UKKey Laboratory of Flexible Optoelectronic Materials and Technology (Ministry of Education), Center for International Cooperation and Disciplinary Innovation in Sustainable Chemical Engineering, School of Optoelectronic Materials and Technology, Jianghan University, Wuhan 430056, ChinaRecent advances in electrochemiluminescence (ECL) leveraging thermally activated delayed fluorescence (TADF) have highlighted its potential for near-unity exciton harvesting. However, there are still very limited examples of TADF-ECL emitters. We present a rigid diboron-embedded multiple-resonance TADF emitter, which exhibits blue–green emission at 493 nm with a remarkably narrow bandwidth (FWHM = 22 nm) and minimized singlet-triplet energy gap (ΔE<sub>ST</sub> = 0.2 eV), achieving a 67% photoluminescence quantum yield. DFT calculations confirm the short-range charge transfer, enabling narrowband emission. Co-reactant-dependent ECL shows that tripropylamine (TPrA) improves the ECL efficiency from 11% (annihilation) to 51%, while benzoyl peroxide (BPO) yields 1% due to poor radical stabilization. ECL spectra align with photoluminescence, confirming the singlet-state dominance without exciplex interference. TPrA enhances stable radical formation and energy transfer, whereas BPO induces non-radiative losses. These findings establish molecular rigidity and co-reactant selection as pivotal factors in developing high-performance TADF-ECL systems, providing fundamental guidelines for designing organic electrochemiluminescent materials with optimized exciton harvesting efficiency.https://www.mdpi.com/1420-3049/30/8/1718electrochemiluminescencethermally activated delayed fluorescenceboronco-reactant ECL |
| spellingShingle | Xiaojie Zhou Jun Cheng Hongbo Wang Synthesis and Electrochemiluminescence of a Di-Boron Thermally Activated Delayed Fluorescence Emitter Molecules electrochemiluminescence thermally activated delayed fluorescence boron co-reactant ECL |
| title | Synthesis and Electrochemiluminescence of a Di-Boron Thermally Activated Delayed Fluorescence Emitter |
| title_full | Synthesis and Electrochemiluminescence of a Di-Boron Thermally Activated Delayed Fluorescence Emitter |
| title_fullStr | Synthesis and Electrochemiluminescence of a Di-Boron Thermally Activated Delayed Fluorescence Emitter |
| title_full_unstemmed | Synthesis and Electrochemiluminescence of a Di-Boron Thermally Activated Delayed Fluorescence Emitter |
| title_short | Synthesis and Electrochemiluminescence of a Di-Boron Thermally Activated Delayed Fluorescence Emitter |
| title_sort | synthesis and electrochemiluminescence of a di boron thermally activated delayed fluorescence emitter |
| topic | electrochemiluminescence thermally activated delayed fluorescence boron co-reactant ECL |
| url | https://www.mdpi.com/1420-3049/30/8/1718 |
| work_keys_str_mv | AT xiaojiezhou synthesisandelectrochemiluminescenceofadiboronthermallyactivateddelayedfluorescenceemitter AT juncheng synthesisandelectrochemiluminescenceofadiboronthermallyactivateddelayedfluorescenceemitter AT hongbowang synthesisandelectrochemiluminescenceofadiboronthermallyactivateddelayedfluorescenceemitter |