scholarly journals Triplet-Triplet Annihilation Upconversion with Reversible Emission-Tunability Induced by Chemical-Stimuli: a Remote Modulator for Photocontrol Isomerization

2020 ◽  
Author(s):  
Yaxiong Wei ◽  
Xialei Lv ◽  
Haitao Xian ◽  
Xiaosong Cao ◽  
Chuluo Yang ◽  
...  
Keyword(s):  
Stokes Shift ◽  
Proof Of Concept ◽  
Ph Responsive ◽  
Acceptor Pair ◽  
Color Tunable ◽  
Chemical Stimuli ◽  
Anti Stokes ◽  
First Time ◽  
Further Development ◽  
Triplet Triplet Annihilation

Triplet-triplet annihilation upconversion (TTA-UC) has been widely studied, but color-tunable TTA-UC system triggered by chemical stimuli has not yet been proposed. Herein, reversible acid/base switching of TTA-UC emission wavelength is achieved for the first time by a simple platform, composed of a direct singlet-triplet (S<sub>0</sub>-T<sub>1</sub>) absorpting photosensitizer, and pH-responsive 9,10-di(pyridin-4-yl)anthracene (DPyA) as acceptor. The photosensitizer-acceptor pair exhibits efficient UC emission (quantum yield up to 3.3%, anti-Stokes shift up to 0.92 eV) with remarkable contrast upon base/acid treatment (Δ<i>λ</i><sub>em,max</sub> = 82 nm, 0.46 eV). In a proof-of-concept study, the color-adjustable TTA-UC emission was applied as a remote modulator to photo-control reversible chemical reactions for the first time. This platform enriches the portfolio of color-switchable TTA-UC, and the mechanism would inspire further development of smart UC systems and extend the application field of upconversion.

scholarly journals Triplet-Triplet Annihilation Upconversion with Reversible Emission-Tunability Induced by Chemical-Stimuli: a Remote Modulator for Photocontrol Isomerization

2020 ◽  
Author(s):  
Yaxiong Wei ◽  
Xialei Lv ◽  
Haitao Xian ◽  
Xiaosong Cao ◽  
Chuluo Yang ◽  
...  
Keyword(s):  
Stokes Shift ◽  
Proof Of Concept ◽  
Ph Responsive ◽  
Acceptor Pair ◽  
Color Tunable ◽  
Chemical Stimuli ◽  
Anti Stokes ◽  
First Time ◽  
Further Development ◽  
Triplet Triplet Annihilation

Triplet-triplet annihilation upconversion (TTA-UC) has been widely studied, but color-tunable TTA-UC system triggered by chemical stimuli has not yet been proposed. Herein, reversible acid/base switching of TTA-UC emission wavelength is achieved for the first time by a simple platform, composed of a direct singlet-triplet (S<sub>0</sub>-T<sub>1</sub>) absorpting photosensitizer, and pH-responsive 9,10-di(pyridin-4-yl)anthracene (DPyA) as acceptor. The photosensitizer-acceptor pair exhibits efficient UC emission (quantum yield up to 3.3%, anti-Stokes shift up to 0.92 eV) with remarkable contrast upon base/acid treatment (Δ<i>λ</i><sub>em,max</sub> = 82 nm, 0.46 eV). In a proof-of-concept study, the color-adjustable TTA-UC emission was applied as a remote modulator to photo-control reversible chemical reactions for the first time. This platform enriches the portfolio of color-switchable TTA-UC, and the mechanism would inspire further development of smart UC systems and extend the application field of upconversion.

Efficient Triplet–Triplet Annihilation Upconversion with an Anti-Stokes Shift of 1.08 eV Achieved by Chemically Tuning Sensitizers

2019 ◽  
Vol 141 (38) ◽  
pp. 15070-15077 ◽  
Author(s):  
Chunying Fan ◽  
Lingling Wei ◽  
Tong Niu ◽  
Ming Rao ◽  
Guo Cheng ◽  
...  
Keyword(s):  
Stokes Shift ◽  
Anti Stokes ◽  
Triplet Triplet Annihilation

Near infrared-to-blue photon upconversion by exploiting direct S–T absorption of a molecular sensitizer

2017 ◽  
Vol 5 (21) ◽  
pp. 5063-5067 ◽  
Author(s):  
Yoichi Sasaki ◽  
Shogo Amemori ◽  
Hironori Kouno ◽  
Nobuhiro Yanai ◽  
Nobuo Kimizuka
Keyword(s):  
Near Infrared ◽  
Stokes Shift ◽  
Anti Stokes ◽  
First Time

Efficient NIR-to-blue photon upconversion was realized for the first time by exploiting sensitizer S–T transition and achieved the largest anti-Stokes shift of 0.97 eV.

A red thermally activated delayed fluorescence material as a triplet sensitizer for triplet–triplet annihilation up-conversion with high efficiency and low energy loss

2017 ◽  
Vol 5 (48) ◽  
pp. 12674-12677 ◽  
Author(s):  
Danqing Wei ◽  
Fan Ni ◽  
Zece Zhu ◽  
Yang Zou ◽  
Chuluo Yang
Keyword(s):  
Energy Loss ◽  
High Efficiency ◽  
Stokes Shift ◽  
Delayed Fluorescence ◽  
Low Energy ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Fluorescence Material ◽  
Anti Stokes ◽  
Triplet Triplet Annihilation

A red thermally activated delayed fluorecence molecule was employed to realize green-to-blue up-conversion emission with a large anti-Stokes shift and high ΦUC′.

Lanthanide Sensitizers for Large Anti-Stokes Shift Near-Infrared-to-Visible Triplet–Triplet Annihilation Photon Upconversion

2020 ◽  
Vol 11 (7) ◽  
pp. 2477-2481 ◽  
Author(s):  
Natalia Kiseleva ◽  
Pariya Nazari ◽  
Carolin Dee ◽  
Dmitry Busko ◽  
Bryce S. Richards ◽  
...  
Keyword(s):  
Near Infrared ◽  
Stokes Shift ◽  
Anti Stokes ◽  
Annihilation Photon ◽  
Triplet Triplet Annihilation

Color-tunable upconversion emission from a twisted intramolecular charge-transfer state of anthracene dimers via triplet–triplet annihilation

2019 ◽  
Vol 6 (5) ◽  
pp. 990-995 ◽  
Author(s):  
Heyuan Liu ◽  
Xinyu Yan ◽  
Li Shen ◽  
Zhaofeng Tang ◽  
Shanshan Liu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Intramolecular Charge Transfer ◽  
Upconversion Emission ◽  
Charge Transfer State ◽  
Twisted Intramolecular Charge Transfer ◽  
Color Tunable ◽  
First Time ◽  
Transfer State ◽  
Triplet Triplet Annihilation

Color-tunable upconversion emission based on triplet–triplet annihilation was achieved for the first time in two anthracene dimers with twisted intramolecular charge-transfer states.

Truxene-bridged Bodipy fullerene tetrads without precious metals: study of the energy transfer and application in triplet–triplet annihilation upconversion

2020 ◽  
Vol 8 (44) ◽  
pp. 15839-15851
Author(s):  
Yuanyuan Che ◽  
Xuemei Yuan ◽  
Lei Sun ◽  
Haijun Xu ◽  
Xiaoyu Zhao ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Absorption Band ◽  
Stokes Shift ◽  
Precious Metals ◽  
Anti Stokes ◽  
Triplet Triplet Annihilation

Truxene-bridged fullerene, Zn–porphyrin and Bodipy tetrad was prepared which have wider absorption band, and used as triplet PS for two-color excitable triplet–triplet annihilation upconversion, with an large anti-Stokes shift of 4074 cm−1.

scholarly journals Triplet–triplet annihilation upconversion with reversible emission-tunability induced by chemical-stimuli: a remote modulator for photocontrol isomerization

2021 ◽  
Author(s):  
Yaxiong Wei ◽  
Haitao Xian ◽  
Xialei Lv ◽  
Fan Ni ◽  
Xiaosong Cao ◽  
...  
Keyword(s):  
Low Energy ◽  
High Contrast ◽  
Stimuli Responsive ◽  
Photochromic Dye ◽  
Dual Color ◽  
Light Excitation ◽  
Chemical Stimuli ◽  
First Time ◽  
Triplet Triplet Annihilation

The chemical stimuli-responsive triplet–triplet annihilation upconversion (TTA-UC) system was demonstrated for the first time with high-contrast dual-color UC emission, and this platform was furtherly adopted to induce reversible photoswitching of a photochromic dye remotely under low-energy light excitation at a fixed wavelength.

scholarly journals New Sensor for Medium- and High-Voltage Measurement

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4654
Author(s):  
Andrzej Wetula ◽  
Andrzej Bień ◽  
Mrunal Parekh
Keyword(s):  
Finite Element Method ◽  
Electronic Devices ◽  
Finite Element Method Simulation ◽  
Laboratory Model ◽  
Power Electronic ◽  
Proof Of Concept ◽  
Voltage Measurement ◽  
Medium Voltage ◽  
Narrow Frequency Band ◽  
Further Development

Measurements of medium and high voltages in a power grid are normally performed with large and bulky voltage transformers or capacitive dividers. Besides installation problems, these devices operate in a relatively narrow frequency band, which limits their usability in modern systems that are saturated with power electronic devices. A sensor that can be installed directly on a wire and can operate without a galvanic connection to the ground may be used as an alternative voltage measurement device. This type of voltage sensor can complement current sensors installed on a wire, forming a complete power acquisition system. This paper presents such a sensor. Our sensor is built using two dielectric elements with different permeability coefficients. A finite element method simulation is used to estimate the parameters of a constructed sensor. Besides simulations, a laboratory model of a sensor was built and tested in a medium-voltage substation. Our results provide a proof of concept for the presented sensor. Some errors in voltage reconstruction have been traced to an oversimplified data acquisition and transmission system, which has to be improved during the further development of the sensor.

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