Singlet and Triplet Exciton Dynamics of Violanthrone

Gholizadeh, Elham M.; Prasad, Shyamal K. K.; Gillan, Lara V.; Nielsen, Michael P.; Ekins-Daukes, N. J.; McCamey, Dane R.; Tayebjee, Murad J. Y.; Schmidt, Timothy W.

doi:10.1021/acs.jpcc.1c06848

Cited by 5 publications

(3 citation statements)

References 41 publications

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“… a Gholizadeh et al 15 b Fitted to Figure 5 b of Gholizadeh et al. 15 c Gholizadeh et al 27 d As determined in Figures 4 and 5 , in agreement with the fit to Gholizadeh et al Figure 5 b 15 e Diffusion-limited. 22 f Spin-statistical.…”

Section: Resultssupporting

confidence: 74%

Photochemical Upconversion in Solution: The Role of Oxygen and Magnetic Field Response

Forecast

Campaioli

Schmidt³

et al. 2023

J. Phys. Chem. A

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Upconversion processes effectively convert two or more low energy photons into one higher energy photon, and they have diverse prospective applications in photovoltaics and biomedicine. We focus on two specific mechanisms for photochemical upconversion in solution: triplet–triplet annihilation (TTA) and singlet oxygen mediated energy transfer (SOMET). TTA is spin-selective, whereas SOMET is not, so the interplay between these two upconversion mechanisms can be examined via their different magnetic field responses. A kinetic model is developed and applied to explain the different photoluminescence profiles of oxygenated versus deoxygenated systems. From the magnetic field response, the triplet–triplet annihilation rate constant is estimated. The conditions required to maximize upconversion photoluminescence intensity in oxygenated solution are determined, providing a set of design principles to guide molecule choices for robust and air-stable upconversion systems in the future.

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Section: Resultssupporting

confidence: 74%

Photochemical Upconversion in Solution: The Role of Oxygen and Magnetic Field Response

Forecast

Campaioli

Schmidt³

et al. 2023

J. Phys. Chem. A

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“…fitted to Fig. 5b c [24] d As determined in Section III C Figs. 4 and 5, in agreement with fit to reference [15] Fig.…”

Section: B Oxygenated Upconversionmentioning

confidence: 90%

Photochemical Upconversion in Solution: The Role of Oxygen and Magnetic Field Response

Forecast

Campaioli

Schmidt

et al. 2023

Preprint

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Upconversion processes effectively convert two or more low energy photons into one higher energy photon, and have diverse applications in photovoltaics and biomedicine. Upconversion is generally spin-selective, and its magnetic field response can be used to examine the interplay between two different mechanisms for photochemical upconversion in solution: triplet-triplet annihilation, and singlet-oxygen mediated energy transfer. A kinetic model is developed and applied to explain the different photoluminescence profiles of oxygenated versus deoxygenated systems. From the magnetic field response, the triplet-triplet annihilation rate constant is estimated. The conditions required to maximize upconversion photoluminescence intensity in oxygenated solution are determined.

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“…Curtin, Simone Ciampi Electrochemistry coupled to single photon Counting and fluorescence microscopy ARC [ 108,179] Macquarie, Koushik Venkatesan Absorption and photoluminescence spectroscopy [146][147][148][149] Curtin, Nadim Darwish Magnetic force microscopy Melbourne, Trevor Smith, Ken Ghiggino, Christopher Hall Femtosecond transient spectroscopy (UV/Vis, NIR, IR) ARC [ 180,181] Melbourne, Trevor Smith Time-correlated Single photon counting (TCSPC) ARC [ 182,183] Melbourne, Trevor Smith Fluorescence lifetime imaging microscopy (FLIM) ARC [ 184,185] Melbourne, Trevor Smith Photocurrent microspectrosopy ARC [ 186] Melbourne, Trevor Smith, Ken Ghiggino Nanosecond-gated spectroscopy ARC [ 187] Melbourne, Trevor Smith Single molecule fluorescence spectroscopy, polarised, total internal reflection, superresolution ARC [188][189][190] Monash, Agustin Schiffrin Wavelength-tunable (650-15 000 nm) femtosecond laser for pump-probe spectroscopy and THz time-domain spectroscopy ARC UNSW, Timothy Schmidt Femtosecond and nanosecond transient absorption and photoluminescence spectroscopy ARC [ 58,[191][192][193][194][195] ARENA UNSW, Timothy Schmidt Time-correlated single-photon counting ARC [ 191] ARENA UNSW, Timothy Schmidt Magnetic field effects on photoluminescence ARC [ 58,192] ARENA UNSW, Murad Tayebjee Femtosecond stimulated Raman and transient absorption spectroscopies, timeresolved THz spectroscopy and magnetic-field variants of the above ARC ARENA UWA, Paul Low UV-Vis-NIR/IR spectroelectrochemistry ARC [ 89,162,[196][197][198] large area junctions by the Low group and the Cea and Martin groups at the University of Zaragoza. [163] (v) Colette Boskovic with leading computational chemi...…”

Section: Referencesmentioning

confidence: 99%

Molecular electronics: an Australian perspective

Reimers

Low

2023

Aust. J. Chem.

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Molecular electronics is a scientific endeavour that, for 60 years, has offered the promise of new technologies in which molecules integrate with, if not entirely replace, semiconductor electronics. En route to the attainment of these ambitious goals, central aspects underpinning the pursuit of this science have proven critical to the development of related technologies, including organic photovoltaics (OPV) and organic light-emitting diodes (OLEDs). Looking ahead, new opportunities in the field abound, from the study of molecular charge transport and the elucidation of molecular reaction mechanisms, to the development of biocompatible and degradable electronics, and the construction of novel chemical sensors with exquisite sensitivity and specificity. This article reviews historical developments in molecular electronics, with a particular focus on Australia’s contributions to the area. Australia’s current activity in molecular electronics research is also summarised, highlighting the capacity to both advance fundamental knowledge and develop new technologies. Scientific aspects considered include capabilities in: single molecule and molecular–monolayer junction measurement; spectroscopic analysis of molecular components and materials; synthetic chemistry; computational analysis of molecular materials and junctions; and the development of theoretical concepts that describe the electrical characteristics of molecular components, materials and putative device structures. Technological aspects considered include various aspects of molecular material design and implementation, such as: OPV and OLED construction, sensing technologies and applications, and power generation from heat gradients or friction. Missing capabilities are identified, and a future pathway for Australian scientific and technological development envisaged.

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Singlet and Triplet Exciton Dynamics of Violanthrone

Cited by 5 publications

References 41 publications

Photochemical Upconversion in Solution: The Role of Oxygen and Magnetic Field Response

Photochemical Upconversion in Solution: The Role of Oxygen and Magnetic Field Response

Photochemical Upconversion in Solution: The Role of Oxygen and Magnetic Field Response

Molecular electronics: an Australian perspective

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