1
|
Dill RD, Joshi G, Thorley KJ, Anthony JE, Fluegel B, Johnson JC, Reid OG. Near-Infrared Absorption Features of Triplet-Pair States Assigned by Photoinduced-Absorption-Detected Magnetic Resonance. J Phys Chem Lett 2023; 14:2387-2394. [PMID: 36848633 PMCID: PMC10009807 DOI: 10.1021/acs.jpclett.2c03665] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 02/22/2023] [Indexed: 06/18/2023]
Abstract
Singlet fission proceeds through a manifold of triplet-pair states that are exceedingly difficult to distinguish spectroscopically. Here, we introduce a new implementation of photoinduced-absorption-detected magnetic resonance (PADMR) and use it to understand the excited-state absorption spectrum of a tri-2-pentylsilylethynyl pentadithiophene (TSPS-PDT) film. These experiments allow us to directly correlate magnetic transitions driven by RF with electronic transitions in the visible and near-infrared spectrum with high sensitivity. We find that the new near-infrared excited-state transitions that arise in thin films of TSPS-PDT are correlated with the magnetic transitions of T1, not 5TT. Thus, we assign these features to the excited-state absorption of 1TT, which is depleted when T1 states are driven to a spin configuration that forbids subsequent fusion. These results clarify the disputed origin of triplet-associated near-infrared absorption features in singlet-fission materials and demonstrate an incisive general purpose tool for studying the evolution of high-spin excited states.
Collapse
Affiliation(s)
- Ryan D. Dill
- University
of Colorado Boulder, Department of Chemistry, Boulder, Colorado 80309, United States
| | - Gajadhar Joshi
- National
Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Karl J. Thorley
- University
of Kentucky Center for Applied Energy Research, Lexington, Kentucky 40511, United States
| | - John E. Anthony
- University
of Kentucky Center for Applied Energy Research, Lexington, Kentucky 40511, United States
- Department
of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
| | - Brian Fluegel
- National
Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Justin C. Johnson
- National
Renewable Energy Laboratory, Golden, Colorado 80401, United States
- Renewable
and Sustainable Energy Institute, University
of Colorado, Boulder, Colorado 80309, United States
| | - Obadiah G. Reid
- National
Renewable Energy Laboratory, Golden, Colorado 80401, United States
- Renewable
and Sustainable Energy Institute, University
of Colorado, Boulder, Colorado 80309, United States
| |
Collapse
|
2
|
Minaev B, Baryshnikov G, Agren H. Principles of phosphorescent organic light emitting devices. Phys Chem Chem Phys 2014; 16:1719-58. [DOI: 10.1039/c3cp53806k] [Citation(s) in RCA: 345] [Impact Index Per Article: 34.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
3
|
Gotberg K, Tinti D. Determination of the complete14N quadrupole interaction tensor in a photoexeited triplet state by zero and low field optically detected ENDOR Application to NaNO2/Ag. Mol Phys 2011. [DOI: 10.1080/00268978200100072] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
4
|
Minaev B, Ågren H, Angelis FD. Theoretical design of phosphorescence parameters for organic electro-luminescence devices based on iridium complexes. Chem Phys 2009. [DOI: 10.1016/j.chemphys.2009.02.014] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
5
|
Loboda O, Minaev B, Vahtras O, Ruud K, Ågren H. Ab initio study of nonhomogeneous broadening of the zero-field splitting of triplet guest molecules in diluted glasses. J Chem Phys 2003. [DOI: 10.1063/1.1589732] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
6
|
Yagi M, Shioya Y, Higuchi J. Time-resolved electron paramagnetic resonance study of the triplet states of nitronaphthalenes. J Photochem Photobiol A Chem 1991. [DOI: 10.1016/1010-6030(91)85105-p] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
7
|
Optical properties of perturbed NO 2 ? ions in KNO2 doped NaNO2 single crystals. Theor Chem Acc 1990. [DOI: 10.1007/bf01374530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
8
|
Shioya Y, Yagi M, Higuchi J. A time-resolved electron spin resonance study of the triplet states of 1-nitronaphthalene and 1,4-dinitronaphthalene. Chem Phys Lett 1989. [DOI: 10.1016/0009-2614(89)87431-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
9
|
Gradl G, Friedrich J, Kohler BE. Influence of phonons on optically detected magnetic resonances of aromatic molecules in amorphous hosts. J Chem Phys 1986. [DOI: 10.1063/1.450417] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
10
|
Investigation of inhomogeneous line broadening of ODMR transitions in doped organic glasses. Chem Phys Lett 1985. [DOI: 10.1016/0009-2614(85)85138-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
11
|
Gotberg KE, Tinti DS. Non-Condon effects in the phosphorescence spectrum of a NO -2trap in NaNO 2/Ag +. Mol Phys 1985. [DOI: 10.1080/00268978500100071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|