scholarly journals A General Approach for All-visible-light Switching of Diarylethenes through Triplet Sensitization using Semiconducting Nanocrystals

2021 ◽  
Author(s):  
Lili Hou ◽  
Wera Larsson ◽  
Stefan Hecht ◽  
Joakim Andreasson ◽  
Bo Albinsson
Keyword(s):  
Visible Light ◽  
Organic Molecules ◽  
General Strategy ◽  
Triplet Energy ◽  
Excitation Energies ◽  
Photochemical Transformations ◽  
Efficient Route ◽  
Material Sciences ◽  
Triplet Energy Transfer ◽  
Triplet Excitons

Abstract Coupling semiconducting nanocrystals (NCs) with organic molecules provides an efficient route to generate and transfer triplet excitons. These excitons can be used to power photochemical transformations such as photoisomerization reactions using low energy radiation. Thus, it is desirable to develop a general approach that can efficiently be used to control photoswitches using all-visible-light aiming at future applications in life- and material sciences. Here, we demonstrate a simple ‘cocktail’ strategy that can achieve all-visible-light switchable diarylethenes (DAEs) through triplet energy transfer from the hybrid of CdS NCs and phenanthrene-3-carboxylic acid, with high photoisomerization efficiency and improved fatigue resistance. The size-tunable excitation energies of CdS NCs make it possible to precisely match the corresponding energy of the relevant DAE photoswitch. We demonstrate reversible all-visible-light photoisomerization of a series of DAE derivatives both in the liquid and solid state, even in the presence of oxygen. Our general strategy is promising for fabrication of all-visible-light activated optoelectronic devices as well as memories, and should in principle be adaptable to photopharmacology.

Why Triage the Materials with Low Luminescence Quantum Efficiency: The Use of 35Cbz4BzCN as a Universal Host for Organic Light Emitting Diode through Effective Triplet Energy Transfer

2021 ◽  
Author(s):  
Yi-Mei Huang ◽  
Tse-Ying Chen ◽  
Deng-Gao Chen ◽  
Hsuan-Chi Liang ◽  
Cheng-Ham Wu ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Delayed Fluorescence ◽  
Triplet Energy ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Thermally Activated ◽  
Triplet Energy Transfer ◽  
Triplet Lifetime ◽  
Triplet Excitons

35Cbz4BzCN, a novel universal host with long triplet lifetime, has been developed. The triplet excitons in 35Cbz4BzCN can be effectively harvested by phosphorescence and thermally activated delayed fluorescence emitters. In...

scholarly journals Visible Light-Enabled Paternò-Büchi Reaction via Triplet Energy Transfer for the Synthesis of Oxetanes

2020 ◽  
Author(s):  
Katie Rykaczewski ◽  
Corinna Schindler
Keyword(s):  
Energy Transfer ◽  
Visible Light ◽  
Uv Light ◽  
Cycloaddition Reaction ◽  
High Energy ◽  
Triplet Energy ◽  
Reaction Conditions ◽  
Triplet Energy Transfer

<div> <p>One of the most efficient ways to synthesize oxetanes is the light-enabled [2+2] cycloaddition reaction of carbonyls and alkenes, referred to as the Paternò-Büchi reaction. The reaction conditions for this transformation typically require the use of high energy UV light to excite the carbonyl, limiting the applications, safety, and scalability. We herein report the development of a visible light-mediated Paternò-Büchi reaction protocol that relies on triplet energy transfer from an iridium-based photocatalyst to the carbonyl substrates. This mode of activation is demonstrated for a variety of aryl glyoxylates and negates the need for both, visible light-absorbing carbonyl starting materials or UV light to enable access to a variety of functionalized oxetanes in up to 99% yield.</p> </div> <br>

scholarly journals Correction to Direct vs Delayed Triplet Energy Transfer from Organic Semiconductors to Quantum Dots and Implications for Luminescent Harvesting of Triplet Excitons

ACS Nano ◽  
2020 ◽  
Vol 14 (8) ◽  
pp. 10748-10749
Author(s):  
Victor Gray ◽  
Jesse R. Allardice ◽  
Zhilong Zhang ◽  
Simon Dowland ◽  
James Xiao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Organic Semiconductors ◽  
Triplet Energy ◽  
Triplet Energy Transfer ◽  
Triplet Excitons

Triplet–triplet energy transfer between organic molecules trapped in zeolites

1996 ◽  
pp. 2049-2050 ◽  
Author(s):  
Kasi Pitchumani ◽  
Janet N. Gamlin ◽  
V. Ramamurthy ◽  
John R. Scheffer
Keyword(s):  
Energy Transfer ◽  
Organic Molecules ◽  
Triplet Energy ◽  
Triplet Energy Transfer

scholarly journals Providing power for miniaturized medical implants: triplet sensitization of semiconductor surfaces

2013 ◽  
Vol 371 (1995) ◽  
pp. 20120334 ◽  
Author(s):  
Andrew C. Benniston ◽  
Anthony Harriman ◽  
Songjie Yang
Keyword(s):  
Energy Transfer ◽  
Organic Molecules ◽  
The Body ◽  
Diagnostic Tools ◽  
Medical Implants ◽  
Triplet Energy ◽  
Medical Diagnostic ◽  
High Fraction ◽  
Triplet Energy Transfer ◽  
Photonic Energy

Here, we recognize the growing significance of miniaturized devices as medical diagnostic tools and highlight the need to provide a convenient means of powering such instruments when implanted into the body. One of the most promising approaches to this end involves using a light-collection facility to absorb incident white light and transfer the photonic energy to a tiny semiconductor embedded on the device. Although fluorescent organic molecules offer strong potential as modules for such solar collectors, we emphasize the promise offered by transition metal complexes. Thus, an extended series of binuclear Ru(II)/Os(II) poly(pyridine) complexes has been shown to be highly promising sensitizers for amorphous silicon solar cells. These materials absorb a high fraction of visible light while the Ru(II)-based units possess triplet energies that are comparable to those of the naphthalene-based bridge. The metal complex injects a triplet exciton into the bridge and this, in turn, is trapped by the Os(II)-based terminal. The result is extremely efficacious triplet-energy transfer; at room temperature the rate of energy transfer is independent of distance over some 6 nm and only weakly dependent on temperature.

scholarly journals Visible Light-Mediated [2+2] Cycloaddition for the Synthesis of Azetidines via Energy Transfer

2018 ◽  
Author(s):  
Marc R. Becker ◽  
Alistair D. Richardson ◽  
Corinna S. Schindler
Keyword(s):  
Energy Transfer ◽  
Visible Light ◽  
Functional Group ◽  
Transfer Mechanism ◽  
Synthetic Methods ◽  
Energy Transfer Mechanism ◽  
Triplet Energy ◽  
Mechanistic Investigations ◽  
Triplet Energy Transfer ◽  
Operational Simplicity

<p>Due to the lack of synthetic methods for their synthesis, azetidines are an underrepresented class of nitrogen-containing heterocycles. Herein, we describe the development of a mild, general protocol for the synthesis of azetidines relying on a visible light-mediated [2+2] cycloaddition between oximes and olefins catalyzed by an iridium photocatalyst. This approach is characterized by its operational simplicity, low catalyst loadings and functional group tolerance. Mechanistic investigations suggest that a triplet energy transfer mechanism is operative.<br></p>

scholarly journals Bodipy–C60 triple hydrogen bonding assemblies as heavy atom-free triplet photosensitizers: preparation and study of the singlet/triplet energy transfer

2015 ◽  
Vol 6 (7) ◽  
pp. 3724-3737 ◽  
Author(s):  
Song Guo ◽  
Liang Xu ◽  
Kejing Xu ◽  
Jianzhang Zhao ◽  
Betül Küçüköz ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Energy Transfer ◽  
Visible Light ◽  
Light Harvesting ◽  
Heavy Atom ◽  
Intersystem Crossing ◽  
Triplet Energy ◽  
Triplet Energy Transfer

Hydrogen bonding-mediated supramolecular triplet photosensitizers with easily interchangeable visible light-harvesting Bodipy modules and the fullerene intersystem crossing module were devised.

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