Ultrafast spin-flip exciton conversion and narrowband sky-blue luminescence in a fused polycyclic selenaborin emitter
Thermally activated delayed fluorescence (TADF) materials with high photoluminescence quantum yields and fast reverse intersystem crossing (RISC) capabilities are highly desirable for applications in high-efficiency organic light-emitting diodes. Herein, we report the synthesis as well as structural...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2024-03-01
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| Series: | Frontiers in Chemistry |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fchem.2024.1375552/full |
| _version_ | 1797246710126215168 |
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| author | Sudhir K. Keshri Guanting Liu Takuma Yasuda Takuma Yasuda |
| author_facet | Sudhir K. Keshri Guanting Liu Takuma Yasuda Takuma Yasuda |
| author_sort | Sudhir K. Keshri |
| collection | DOAJ |
| description | Thermally activated delayed fluorescence (TADF) materials with high photoluminescence quantum yields and fast reverse intersystem crossing (RISC) capabilities are highly desirable for applications in high-efficiency organic light-emitting diodes. Herein, we report the synthesis as well as structural and photophysical properties of 5,9-diselena-13b-boranaphtho[3,2,1-de]anthracene (SeBSe) as a narrowband-emissive TADF material. The incorporation of two selenium atoms into the boron-fused pentacyclic π-core results in a small singlet–triplet energy gap (ΔEST) and thereby significant TADF properties. Moreover, theoretical calculations revealed a noticeable spin-orbit coupling enhancement between the singlet and triplet manifolds in SeBSe by virtue of the heavy-atom effect of selenium atoms. Consequently, SeBSe allows ultrafast spin-flip RISC with the rate constant surpassing 108 s−1, which far exceeds the corresponding fluorescence radiative decay rate (∼106 s−1), enabling an ideal singlet–triplet superimposed excited state. |
| first_indexed | 2024-04-24T19:47:07Z |
| format | Article |
| id | doaj.art-34b4ab6b28be4fbf9c1a380b1cbdb3b3 |
| institution | Directory Open Access Journal |
| issn | 2296-2646 |
| language | English |
| last_indexed | 2024-04-24T19:47:07Z |
| publishDate | 2024-03-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Chemistry |
| spelling | doaj.art-34b4ab6b28be4fbf9c1a380b1cbdb3b32024-03-25T04:37:54ZengFrontiers Media S.A.Frontiers in Chemistry2296-26462024-03-011210.3389/fchem.2024.13755521375552Ultrafast spin-flip exciton conversion and narrowband sky-blue luminescence in a fused polycyclic selenaborin emitterSudhir K. Keshri0Guanting Liu1Takuma Yasuda2Takuma Yasuda3Institute for Advanced Study, Kyushu University, Fukuoka, JapanInstitute for Advanced Study, Kyushu University, Fukuoka, JapanInstitute for Advanced Study, Kyushu University, Fukuoka, JapanDepartment of Applied Chemistry, Kyushu University, Fukuoka, JapanThermally activated delayed fluorescence (TADF) materials with high photoluminescence quantum yields and fast reverse intersystem crossing (RISC) capabilities are highly desirable for applications in high-efficiency organic light-emitting diodes. Herein, we report the synthesis as well as structural and photophysical properties of 5,9-diselena-13b-boranaphtho[3,2,1-de]anthracene (SeBSe) as a narrowband-emissive TADF material. The incorporation of two selenium atoms into the boron-fused pentacyclic π-core results in a small singlet–triplet energy gap (ΔEST) and thereby significant TADF properties. Moreover, theoretical calculations revealed a noticeable spin-orbit coupling enhancement between the singlet and triplet manifolds in SeBSe by virtue of the heavy-atom effect of selenium atoms. Consequently, SeBSe allows ultrafast spin-flip RISC with the rate constant surpassing 108 s−1, which far exceeds the corresponding fluorescence radiative decay rate (∼106 s−1), enabling an ideal singlet–triplet superimposed excited state.https://www.frontiersin.org/articles/10.3389/fchem.2024.1375552/fullthermally activated delayed fluorescencenarrowband emissionselenaborinspinorbit couplingheavy atom effecthelicity |
| spellingShingle | Sudhir K. Keshri Guanting Liu Takuma Yasuda Takuma Yasuda Ultrafast spin-flip exciton conversion and narrowband sky-blue luminescence in a fused polycyclic selenaborin emitter Frontiers in Chemistry thermally activated delayed fluorescence narrowband emission selenaborin spinorbit coupling heavy atom effect helicity |
| title | Ultrafast spin-flip exciton conversion and narrowband sky-blue luminescence in a fused polycyclic selenaborin emitter |
| title_full | Ultrafast spin-flip exciton conversion and narrowband sky-blue luminescence in a fused polycyclic selenaborin emitter |
| title_fullStr | Ultrafast spin-flip exciton conversion and narrowband sky-blue luminescence in a fused polycyclic selenaborin emitter |
| title_full_unstemmed | Ultrafast spin-flip exciton conversion and narrowband sky-blue luminescence in a fused polycyclic selenaborin emitter |
| title_short | Ultrafast spin-flip exciton conversion and narrowband sky-blue luminescence in a fused polycyclic selenaborin emitter |
| title_sort | ultrafast spin flip exciton conversion and narrowband sky blue luminescence in a fused polycyclic selenaborin emitter |
| topic | thermally activated delayed fluorescence narrowband emission selenaborin spinorbit coupling heavy atom effect helicity |
| url | https://www.frontiersin.org/articles/10.3389/fchem.2024.1375552/full |
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