1
|
Hodée M, Massue J, Achelle S, Fihey A, Tondelier D, Ulrich G, Guen FRL, Katan C. Styrylpyrimidine chromophores with bulky electron-donating substituents: experimental and theoretical investigation. Phys Chem Chem Phys 2023; 25:32699-32708. [PMID: 38014523 DOI: 10.1039/d3cp03705c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
Styrylpyrimidines with bulky 9,9-dimethylacridan, phenoxazine and phenothiazine electron-donating fragments were designed. Thermally activated delayed fluorescence (TADF) properties were expected for these structures. These chromophores exhibit peculiar emission properties. For 9,9-dimethylacridan and phenoxazine derivatives, a single emission highly sensitive to the polarity is observed in solution whereas for phenothiazine derivative a dual emission is observed in solution and is attributed to the coexistence of quasi-axial (Qax) and quasi-equatorial (Qeq) conformers. This study intends to understand through theoretical and experimental works, why the studied chromophores do not exhibit TADF properties, contrary to what was expected. The absence of phosphorescence both at room temperature and 77 K tends to indicate the impossibility to harvest triplet states in these systems. Wave-function based calculations show that for both conformers of the three chromophores the S1-T1 splitting is significantly larger than 0.2 eV. The second triplet state T2 of Qeq conformers is found very close in energy to the singlet S1 state, but S1 and T2 states possess similar charge transfer characters. This prevents efficient spin-orbit coupling between the states, which is consistent with the absence of TADF.
Collapse
Affiliation(s)
- Maxime Hodée
- Univ Rennes, ENSCR, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France.
| | - Julien Massue
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES), UMR CNRS 7515, Equipe Chimie Organique pour la Biologie, les Matériaux et l'Optique (COMBO) 25 Rue Becquerel, 67087 Strasbourg, Cedex 02, France.
| | - Sylvain Achelle
- Univ Rennes, ENSCR, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France.
| | - Arnaud Fihey
- Univ Rennes, ENSCR, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France.
| | - Denis Tondelier
- Laboratoire de Physique des Interfaces et des Couches Minces (LPICM), CNRS, Ecole Polytechnique, IP Paris, Palaiseau Cedex, France
- Université Paris-Saclay, CEA, CNRS, NIMBE, LICSEN, Gif-sur-Yvette, France
| | - Gilles Ulrich
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES), UMR CNRS 7515, Equipe Chimie Organique pour la Biologie, les Matériaux et l'Optique (COMBO) 25 Rue Becquerel, 67087 Strasbourg, Cedex 02, France.
| | - Françoise Robin-le Guen
- Univ Rennes, ENSCR, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France.
| | - Claudine Katan
- Univ Rennes, ENSCR, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France.
| |
Collapse
|
2
|
Efficient circularly polarized photoluminescence and electroluminescence of chiral spiro-skeleton based thermally activated delayed fluorescence molecules. Sci China Chem 2022. [DOI: 10.1007/s11426-022-1249-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
3
|
Liu F, Cheng Z, Jiang Y, Gao L, Liu H, Liu H, Feng Z, Lu P, Yang W. Highly Efficient Asymmetric Multiple Resonance Thermally Activated Delayed Fluorescence Emitter with EQE of 32.8 % and Extremely Low Efficiency Roll-Off. Angew Chem Int Ed Engl 2022; 61:e202116927. [PMID: 35104385 DOI: 10.1002/anie.202116927] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Indexed: 01/01/2023]
Abstract
Multiple resonance thermally activated delayed fluorescence (MR-TADF) emitters show great potentials for high color purity organic light-emitting diodes (OLEDs). However, the simultaneous realization of high photoluminescence quantum yield (PLQY) and high reverse intersystem crossing rate (kRISC ) is still a formidable challenge. Herein, a novel asymmetric MR-TADF emitter (2Cz-PTZ-BN) is designed that fully inherits the high PLQY and large kRISC values of the properly selected parent molecules. The resonating extended π-skeleton with peripheral protection can achieve a high PLQY of 96 % and a fast kRISC of above 1.0×105 s-1 , and boost the performance of corresponding pure green devices with an outstanding external quantum efficiency (EQE) of up to 32.8 % without utilizing any sensitizing hosts. Remarkably, the device sufficiently maintains a high EQE exceeding 23 % at a high luminance of 1000 cd m-2 , representing the highest value for reported green MR-TADF materials at the same luminescence.
Collapse
Affiliation(s)
- Futong Liu
- Jilin University, State Key Laboratory of Supramolecular Structure and Materials, Department of Chemistry, Changchun, 130012, P. R. China
| | - Zhuang Cheng
- Jilin University, State Key Laboratory of Supramolecular Structure and Materials, Department of Chemistry, Changchun, 130012, P. R. China
| | - Yixuan Jiang
- Jilin University, State Key Laboratory of Supramolecular Structure and Materials, Department of Chemistry, Changchun, 130012, P. R. China
| | - Lei Gao
- Jilin University, State Key Laboratory of Supramolecular Structure and Materials, Department of Chemistry, Changchun, 130012, P. R. China
| | - Hanxuan Liu
- Jilin University, State Key Laboratory of Supramolecular Structure and Materials, Department of Chemistry, Changchun, 130012, P. R. China
| | - Hui Liu
- Jilin University, State Key Laboratory of Supramolecular Structure and Materials, Department of Chemistry, Changchun, 130012, P. R. China
| | - Zijun Feng
- Jilin University, State Key Laboratory of Supramolecular Structure and Materials, Department of Chemistry, Changchun, 130012, P. R. China
| | - Ping Lu
- Jilin University, State Key Laboratory of Supramolecular Structure and Materials, Department of Chemistry, Changchun, 130012, P. R. China
| | - Wensheng Yang
- Institute of Molecular Plus, Tianjin University, Tianjin, 300072, P. R. China
| |
Collapse
|
4
|
Liu F, Cheng Z, Jiang Y, Gao L, Liu H, Liu H, Feng Z, Lu P, Yang W. Highly Efficient Asymmetric Multiple Resonance Thermally Activated Delayed Fluorescence Emitter with EQE of 32.8 % and Extremely Low Efficiency Roll‐Off. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202116927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Futong Liu
- Jilin University State Key Laboratory of Supramolecular Structure and Materials Department of Chemistry Changchun 130012 P. R. China
| | - Zhuang Cheng
- Jilin University State Key Laboratory of Supramolecular Structure and Materials Department of Chemistry Changchun 130012 P. R. China
| | - Yixuan Jiang
- Jilin University State Key Laboratory of Supramolecular Structure and Materials Department of Chemistry Changchun 130012 P. R. China
| | - Lei Gao
- Jilin University State Key Laboratory of Supramolecular Structure and Materials Department of Chemistry Changchun 130012 P. R. China
| | - Hanxuan Liu
- Jilin University State Key Laboratory of Supramolecular Structure and Materials Department of Chemistry Changchun 130012 P. R. China
| | - Hui Liu
- Jilin University State Key Laboratory of Supramolecular Structure and Materials Department of Chemistry Changchun 130012 P. R. China
| | - Zijun Feng
- Jilin University State Key Laboratory of Supramolecular Structure and Materials Department of Chemistry Changchun 130012 P. R. China
| | - Ping Lu
- Jilin University State Key Laboratory of Supramolecular Structure and Materials Department of Chemistry Changchun 130012 P. R. China
| | - Wensheng Yang
- Institute of Molecular Plus Tianjin University Tianjin 300072 P. R. China
| |
Collapse
|