H2O2-activated triplet–triplet annihilation upconversion via modulation of the fluorescence quantum yields of the triplet acceptor and the triplet–triplet-energy-transfer efficiency

2015 ◽  
Vol 51 (62) ◽  
pp. 12403-12406 ◽  
Author(s):  
Renjie Tao ◽  
Jianzhang Zhao ◽  
Fangfang Zhong ◽  
Caishun Zhang ◽  
Wenbo Yang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Energy Transfer Efficiency ◽  
Transfer Efficiency ◽  
Quantum Yields ◽  
Fluorescent Product ◽  
Triplet Energy ◽  
Fluorescence Quantum Yields ◽  
Triplet Energy Transfer ◽  
Triplet Triplet Annihilation

H2O2-activatable TTA upconversion was achieved with non-fluorescent 9,10-bis(diphenylphosphino)anthracene as a triplet acceptor/emitter, which can be oxidized to a fluorescent product by H2O2.

Un exemple d'isomérisation radicalaire en chaînes: la photoinduction de l'isomérisation cis–trans de la pentène-3 one-2

1977 ◽  
Vol 55 (22) ◽  
pp. 3915-3926 ◽  
Author(s):  
Armel Rioual ◽  
André Deflandre ◽  
Jacques Lemaire
Keyword(s):  
Energy Transfer ◽  
Quantum Yields ◽  
Unsaturated Ketone ◽  
Chain Process ◽  
Triplet Energy ◽  
Low Concentrations ◽  
Energy Transfers ◽  
Donor And Acceptor ◽  
A Chain ◽  
Triplet Energy Transfer

Mechanisms of the photosensitized cis–trans photoisomerization of 3-penten-2-one which do not imply only classical triplet–triplet energy transfer are proposed; they are based upon measurements of the variations of initial quantum yields of isomerization with the initial donor and acceptor concentrations, the wavelength of excitation, and the nature of the donor and of the solvent. Carbonyl donors (acetophenone, benzophenone, acetone) induce a radical isomerization by a chain process in reducing solvents; the example of acetophenone is specially interesting. In solvents in which the donor is not photoreduced (as benzene or CCl4) classical triplet–triplet energy transfers occur. Sensitization with aromatic donors (benzene, mesitylene) proceeds through triplet–triplet energy transfer at low concentrations of the acceptor. At higher concentrations of acceptor, an exciplex is formed between the ketone and the aromatic in its singlet excited state; this exciplex is deactivated by dissociation and by causing the isomerization of the α,β-unsaturated ketone.

Triplet–triplet annihilation upconversion through triplet energy transfer at a nanoporous solid–liquid interface

2020 ◽  
Vol 22 (32) ◽  
pp. 17807-17813
Author(s):  
Toshiko Mizokuro ◽  
Aizitiaili Abulikemu ◽  
Kengo Suzuki ◽  
Yusuke Sakagami ◽  
Ritsuki Nishii ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Liquid Interface ◽  
Triplet Energy ◽  
Nanoporous Glass ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Triplet Energy Transfer ◽  
Triplet Triplet Annihilation

Photon upconversion and the triplet energy transfer dynamics were studied for sensitizer-fixed nanoporous glass immersed in emitter solution.

Electrochemically triggered upconverted luminescence for light-emitting devices

2019 ◽  
Vol 55 (84) ◽  
pp. 12611-12614 ◽  
Author(s):  
Haruki Minami ◽  
Takuya Ichikawa ◽  
Kazuki Nakamura ◽  
Norihisa Kobayashi
Keyword(s):  
Energy Transfer ◽  
Triplet Energy ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Triplet Energy Transfer ◽  
First Time ◽  
Triplet Triplet Annihilation

Electrochemically triggered upconverted luminescence through triplet–triplet energy transfer (TTET) and subsequent triplet–triplet annihilation upconversion (TTA-UC) is observed for the first time.

P-Typ-verzögerte Fluoreszenz von 1-Naphthyl-9-carbazyl-methan

1986 ◽  
Vol 41 (7) ◽  
pp. 971-973
Author(s):  
Maximilian Zander
Keyword(s):  
Energy Transfer ◽  
Filter Paper ◽  
Light Absorption ◽  
Delayed Fluorescence ◽  
Triplet Energy ◽  
Experimental Findings ◽  
Triplet Energy Transfer ◽  
Step Mechanism ◽  
Triplet Triplet Annihilation

P-tvpe Delayed Fluorescence o f 1-Naphthyl-9-carbazyl-methane At 77 K 1-naphthyl-9-carbazyl-methane adsorbed on filter paper shows predominantly delayed fluorescence o f the carbazole chromophore. The experimental findings are in agreement with the assumption that the carbazole chromophore after excitation by light absorption becomes first deactivated by intramolecular triplet-triplet energy transfer and then re-excited in a two-step mechanism including intermolecular naphthalene triplet-triplet annihilation and intramolecular singlet-singlet energy transfer from the naphthalene to the carbazole chromophore.

scholarly journals Green-to-Blue Triplet Fusion Upconversion Sensitized by Anisotropic CdSe Nanoplatelets

2020 ◽  
Author(s):  
Zachary A. VanOrman ◽  
Alexander S. Bieber ◽  
Sarah Wieghold ◽  
Lea Nienhaus
Keyword(s):  
Energy Transfer ◽  
Quantum Confinement ◽  
Quantum Yields ◽  
Cdse Nanocrystals ◽  
Triplet Energy ◽  
Tunneling Barrier ◽  
Low Efficiency ◽  
Back Transfer ◽  
Triplet Energy Transfer ◽  
Photocatalytic Applications

<p>Green-to-blue photon upconversion bears great potential in photocatalytic applications. However, current hybrid inorganic-organic upconversion schemes utilizing spherical CdSe nanocrystals are often limited by energetic polydispersity, low quantum yields and an additional tunneling barrier resulting from the necessity of surface-passivating inorganic shells. In this contribution, we introduce anisotropic CdSe nanoplatelets as triplet sensitizers. Here, quantum confinement occurs in only one direction, erasing effects stemming from energetic polydispersity. We investigate the triplet energy transfer from the CdSe nanoplatelets to the surface-bound triplet acceptor 9-anthracene carboxylic acid. We further focus on the influence of nanoplatelet stacking and singlet back transfer on the observed upconversion efficiency. We obtain an upconversion quantum yield of 5.4% at a power density of 11 W/cm<sup>2­</sup> using the annihilator 9,10-diphenylanthracene, and a low efficiency threshold <i>I</i><sub>th</sub> of 237 mW/cm<sup>2</sup>. </p>

Intramolecular triplet–triplet energy transfer enhanced triplet–triplet annihilation upconversion with a short-lived triplet state platinum(ii) terpyridyl acetylide photosensitizer

RSC Advances ◽  
2015 ◽  
Vol 5 (86) ◽  
pp. 70640-70648 ◽  
Author(s):  
Shuai Yu ◽  
Yi Zeng ◽  
Jinping Chen ◽  
Tianjun Yu ◽  
Xiaohui Zhang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Triplet State ◽  
Triplet Energy ◽  
Triplet Energy Transfer ◽  
Triplet Triplet Annihilation

A triplet–triplet annihilation upconversion system with a short-lived triplet state photosensitizer was constructed and enhanced by the design of intramolecular triplet–triplet energy transfer.

scholarly journals Green-to-Blue Triplet Fusion Upconversion Sensitized by Anisotropic CdSe Nanoplatelets

2020 ◽  
Author(s):  
Zachary A. VanOrman ◽  
Alexander S. Bieber ◽  
Sarah Wieghold ◽  
Lea Nienhaus
Keyword(s):  
Energy Transfer ◽  
Quantum Confinement ◽  
Quantum Yields ◽  
Cdse Nanocrystals ◽  
Triplet Energy ◽  
Tunneling Barrier ◽  
Low Efficiency ◽  
Back Transfer ◽  
Triplet Energy Transfer ◽  
Photocatalytic Applications

<p>Green-to-blue photon upconversion bears great potential in photocatalytic applications. However, current hybrid inorganic-organic upconversion schemes utilizing spherical CdSe nanocrystals are often limited by energetic polydispersity, low quantum yields and an additional tunneling barrier resulting from the necessity of surface-passivating inorganic shells. In this contribution, we introduce anisotropic CdSe nanoplatelets as triplet sensitizers. Here, quantum confinement occurs in only one direction, erasing effects stemming from energetic polydispersity. We investigate the triplet energy transfer from the CdSe nanoplatelets to the surface-bound triplet acceptor 9-anthracene carboxylic acid. We further focus on the influence of nanoplatelet stacking and singlet back transfer on the observed upconversion efficiency. We obtain an upconversion quantum yield of 5.4% at a power density of 11 W/cm<sup>2­</sup> using the annihilator 9,10-diphenylanthracene, and a low efficiency threshold <i>I</i><sub>th</sub> of 237 mW/cm<sup>2</sup>. </p>

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