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Pompetti N, Smyser KE, Feingold B, Owens R, Lama B, Sharma S, Damrauer NH, Johnson JC. Tetracene Diacid Aggregates for Directing Energy Flow toward Triplet Pairs. J Am Chem Soc 2024; 146. [PMID: 38606884 PMCID: PMC11046478 DOI: 10.1021/jacs.4c02058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 03/27/2024] [Accepted: 03/28/2024] [Indexed: 04/13/2024]
Abstract
A comprehensive investigation of the solution-phase photophysics of tetracene bis-carboxylic acid [5,12-tetracenepropiolic acid (Tc-DA)] and its related methyl ester [5,12-tetracenepropynoate (Tc-DE)], a non-hydrogen-bonding counterpart, reveals the role of the carboxylic acid moiety in driving molecular aggregation and concomitant excited-state behavior. Low-concentration solutions of Tc-DA exhibit similar properties to the popular 5,12-bis((triisopropylsilyl)ethynl)tetracene, but as the concentration increases, evidence for aggregates that form excimers and a new mixed-state species with charge-transfer (CT) and correlated triplet pair (TT) character is revealed by transient absorption and fluorescence experiments. Aggregates of Tc-DA evolve further with concentration toward an additional phase that is dominated by the mixed CT/TT state which is the only state present in Tc-DE aggregates and can be modulated with the solvent polarity. Computational modeling finds that cofacial arrangement of Tc-DA and Tc-DE subunits is the most stable aggregate structure and this agrees with results from 1H NMR spectroscopy. The calculated spectra of these cofacial dimers replicate the observed broadening in ground-state absorption as well as accurately predict the formation of a near-UV transition associated with a CT between molecular subunits that is unique to the specific aggregate structure. Taken together, the results suggest that the hydrogen bonding between Tc-DA molecules and the associated disruption of hydrogen bonding with solvent produce a regime of dimer-like behavior, absent in Tc-DE, that favors excimers rather than CT/TT mixed states. The control of aggregate size and structure using distinct functional groups, solute concentration, and solvent in tetracene promises new avenues for its use in light-harvesting schemes.
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Affiliation(s)
- Nicholas
F. Pompetti
- National
Renewable Energy Laboratory, 15013 Denver West Pkwy, Golden, Colorado 80401, United States
- University
of Colorado, Boulder, Colorado 80401, United States
| | - Kori E. Smyser
- University
of Colorado, Boulder, Colorado 80401, United States
| | | | - Raythe Owens
- University
of Colorado, Boulder, Colorado 80401, United States
| | - Bimala Lama
- University
of Colorado, Boulder, Colorado 80401, United States
| | - Sandeep Sharma
- University
of Colorado, Boulder, Colorado 80401, United States
| | - Niels H. Damrauer
- University
of Colorado, Boulder, Colorado 80401, United States
- Renewable
and Sustainable Energy Institute, University
of Colorado Boulder, Boulder, Colorado 80401, United States
| | - Justin C. Johnson
- National
Renewable Energy Laboratory, 15013 Denver West Pkwy, Golden, Colorado 80401, United States
- Renewable
and Sustainable Energy Institute, University
of Colorado Boulder, Boulder, Colorado 80401, United States
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Maiti S, Siebbeles LDA. Developments and Challenges Involving Triplet Transfer across Organic/Inorganic Heterojunctions for Singlet Fission and Photon Upconversion. J Phys Chem Lett 2023; 14:11168-11176. [PMID: 38055348 PMCID: PMC10726386 DOI: 10.1021/acs.jpclett.3c03013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 12/01/2023] [Accepted: 12/04/2023] [Indexed: 12/08/2023]
Abstract
In this Perspective, we provide an overview of recent advances in harvesting triplets for photovoltaic and photon upconversion applications from two angles. In singlet fission-sensitized solar cells, the triplets are harvested through a low band gap semiconductor such as Si. Recent literature has shown how a thin interlayer or orientation of the singlet fission molecule can successfully lead to triplet transfer. On the other hand, the integration of transition metal dichalcogenides (TMDCs) with suitable organic molecules has shown triplet-triplet annihilation upconversion (TTA-UC) of near-infrared photons. We consider the theoretical aspect of the triplet transfer process between a TMDC and organic semiconductors. We discuss possible bottlenecks that can limit the harvesting of energy from triplets and perspectives to overcome these.
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Affiliation(s)
- Sourav Maiti
- Central
Laser Facility, RCaH, STFC-Rutherford Appleton
Laboratory, Harwell Science and Innovation Campus, Didcot OX11 0QX, United
Kingdom
| | - Laurens D. A. Siebbeles
- Chemical
Engineering Department, Delft University
of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands
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Khan ZU, Khan LU, Brito HF, Gidlund M, Malta OL, Di Mascio P. Colloidal Quantum Dots as an Emerging Vast Platform and Versatile Sensitizer for Singlet Molecular Oxygen Generation. ACS Omega 2023; 8:34328-34353. [PMID: 37779941 PMCID: PMC10536110 DOI: 10.1021/acsomega.3c03962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Accepted: 08/15/2023] [Indexed: 10/03/2023]
Abstract
Singlet molecular oxygen (1O2) has been reported in wide arrays of applications ranging from optoelectronic to photooxygenation reactions and therapy in biomedical proposals. It is also considered a major determinant of photodynamic therapy (PDT) efficacy. Since the direct excitation from the triplet ground state (3O2) of oxygen to the singlet excited state 1O2 is spin forbidden; therefore, a rational design and development of heterogeneous sensitizers is remarkably important for the efficient production of 1O2. For this purpose, quantum dots (QDs) have emerged as versatile candidates either by acting individually as sensitizers for 1O2 generation or by working in conjunction with other inorganic materials or organic sensitizers by providing them a vast platform. Thus, conjoining the photophysical properties of QDs with other materials, e.g., coupling/combining with other inorganic materials, doping with the transition metal ions or lanthanide ions, and conjugation with a molecular sensitizer provide the opportunity to achieve high-efficiency quantum yields of 1O2 which is not possible with either component separately. Hence, the current review has been focused on the recent advances made in the semiconductor QDs, perovskite QDs, and transition metal dichalcogenide QD-sensitized 1O2 generation in the context of ongoing and previously published research work (over the past eight years, from 2015 to 2023).
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Affiliation(s)
- Zahid U. Khan
- Institute
of Chemistry, University of Sao Paulo (USP), 05508-000 São
Paulo-SP, Brazil
| | - Latif U. Khan
- Institute
of Chemistry, University of Sao Paulo (USP), 05508-000 São
Paulo-SP, Brazil
- Synchrotron-light
for Experimental Science and Applications in the Middle East (SESAME), P.O. Box 7, Allan 19252, Jordan
| | - Hermi F. Brito
- Institute
of Chemistry, University of Sao Paulo (USP), 05508-000 São
Paulo-SP, Brazil
| | - Magnus Gidlund
- Institute
of Biomedical Sciences-IV, University of
Sao Paulo (USP), 05508-000 São Paulo-SP, Brazil
| | - Oscar L. Malta
- Departamento
de Química Fundamental, Universidade
Federal de Pernambuco, Recife, PE 50740-560, Brazil
| | - Paolo Di Mascio
- Institute
of Chemistry, University of Sao Paulo (USP), 05508-000 São
Paulo-SP, Brazil
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Sonoda Y, Kamada K. Synthesis, Characterization, and Fluorescence Properties of a Series of Trifluoromethylated Diphenylhexatrienes. J Fluor Chem 2023. [DOI: 10.1016/j.jfluchem.2023.110110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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Gray V, Drake W, Allardice JR, Zhang Z, Xiao J, Congrave DG, Royakkers J, Zeng W, Dowland S, Greenham NC, Bronstein H, Anthony JE, Rao A. Triplet transfer from PbS quantum dots to tetracene ligands: is faster always better? J Mater Chem C Mater 2022; 10:16321-16329. [PMID: 36562020 PMCID: PMC9648495 DOI: 10.1039/d2tc03470k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 09/28/2022] [Indexed: 06/17/2023]
Abstract
Quantum dot-organic semiconductor hybrid materials are gaining increasing attention as spin mixers for applications ranging from solar harvesting to spin memories. Triplet energy transfer between the inorganic quantum dot (QD) and organic semiconductor is a key step to understand in order to develop these applications. Here we report on the triplet energy transfer from PbS QDs to four energetically and structurally similar tetracene ligands. Even with similar ligands we find that the triplet energy transfer dynamics can vary significantly. For TIPS-tetracene derivatives with carboxylic acid, acetic acid and methanethiol anchoring groups on the short pro-cata side we find that triplet transfer occurs through a stepwise process, mediated via a surface state, whereas for monosubstituted TIPS-tetracene derivative 5-(4-benzoic acid)-12-triisopropylsilylethynyl tetracene (BAT) triplet transfer occurs directly, albeit slower, via a Dexter exchange mechanism. Even though triplet transfer is slower with BAT the overall yield is greater, as determined from upconverted emission using rubrene emitters. This work highlights that the surface-mediated transfer mechanism is plagued with parasitic loss pathways and that materials with direct Dexter-like triplet transfer are preferred for high-efficiency applications.
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Affiliation(s)
- Victor Gray
- Cavendish Laboratory, University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK
- Department of Chemistry - Ångström Laboratory, Uppsala University Box 523 751 20 Uppsala Sweden
| | - William Drake
- Cavendish Laboratory, University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK
| | - Jesse R Allardice
- Cavendish Laboratory, University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK
| | - Zhilong Zhang
- Cavendish Laboratory, University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK
| | - James Xiao
- Cavendish Laboratory, University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK
| | - Daniel G Congrave
- Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Jeroen Royakkers
- Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Weixuan Zeng
- Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Simon Dowland
- Cambridge Photon Technology J. J. Thomson Avenue Cambridge CB3 0HE UK
| | - Neil C Greenham
- Cavendish Laboratory, University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK
| | - Hugo Bronstein
- Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - John E Anthony
- University of Kentucky Center for Applied Energy Research 2582 Research Park Dr Lexington Kentucky 40511 USA
| | - Akshay Rao
- Cavendish Laboratory, University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK
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Abstract
Hybrid nanomaterials (HNs), the combination of organic semiconductor ligands attached to nanocrystal semiconductor quantum dots, have applications that span a range of practical fields, including biology, chemistry, medical imaging, and optoelectronics. Specifically, HNs operate as discrete, tunable systems that can perform prompt fluorescence, energy transfer, singlet fission, upconversion, and/or thermally activated delayed fluorescence. Interest in HNs has naturally grown over the years due to their tunability and broad spectrum of applications. This Review presents a brief introduction to the components of HNs, before expanding on the characterization and applications of HNs. Finally, the future of HN applications is discussed.
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