Elongation of Triplet Lifetime Caused by Intramolecular Energy Hopping in Diphenylanthracene Dyads Oriented to Undergo Efficient Triplet–Triplet Annihilation Upconversion

2021 ◽  
Author(s):  
Masaya Kanoh ◽  
Yasunori Matsui ◽  
Kiyomasa Honda ◽  
Yuto Kokita ◽  
Takuya Ogaki ◽  
...  
Keyword(s):  
Triplet Lifetime ◽  
Triplet Triplet Annihilation

scholarly journals Elongation of Triplet Lifetime Caused by Intramolecular Energy Hopping in Diphenylanthracene Dyads Oriented to Undergo Efficient Triplet–Triplet Annihilation Upconversion

2021 ◽  
Author(s):  
Masaya Kanoh ◽  
Yasunori Matsui ◽  
KIyomasa Honda ◽  
Yuto Kokita ◽  
Takuya Ogaki ◽  
...  
Keyword(s):  
Rate Constants ◽  
Threshold Intensity ◽  
Energy Donor ◽  
Low Threshold ◽  
Triplet Lifetime ◽  
Triplet Triplet Annihilation

Triplet–triplet annihilation (TTA)-assisted photon upconversion (TTA-UC) in three dyads (DPA–Cn–DPA), comprised of two diphenylanthracene (DPA) moieties connected by nonconjugated C1, C2, and C3 linkages (Cn), has been investigated. The performance of these dyads as energy acceptors in the presence of the energy donor platinum octaethylporphyrin are characterized by longer triplet lifetimes (<i>τ</i><sub>T</sub>) and different TTA rate constants than those of the parent DPA. The larger <i>t</i><sub>T</sub> of the linked systems, caused by “Intramolecular Energy Hopping” in the triplet dyad <sup>3</sup>DPA*–Cn–DPA, results in a low threshold intensity, a key characteristic of efficient TTA-UC.

Molecular vibration assisted triplet-triplet annihilation nir-upconversion luminescence of fluorescein

2019 ◽  
Vol 96 ◽  
pp. 109286
Author(s):  
Abhishek Kumar ◽  
Luís Pinto da Silva ◽  
Joaquim C.G. Esteves da Silva ◽  
Kaushal Kumar
Keyword(s):  
Upconversion Luminescence ◽  
Molecular Vibration ◽  
Triplet Triplet Annihilation

Room Temperature Phosphorescence vs Triplet–Triplet Annihilation in N-Substituted Acridone Solids

2021 ◽  
pp. 6431-6438
Author(s):  
Ehsan Hamzehpoor ◽  
Cory Ruchlin ◽  
Yuze Tao ◽  
Jorge Eduardo Ramos-Sanchez ◽  
Hatem M. Titi ◽  
...  
Keyword(s):  
Room Temperature ◽  
Room Temperature Phosphorescence ◽  
Triplet Triplet Annihilation

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 Intramolecular Triplet–Triplet Annihilation Photon Upconversion in Diffusionally Restricted Anthracene Polymer

2021 ◽  
Author(s):  
Fredrik Edhborg ◽  
Hakan Bildirir ◽  
Pankaj Bharmoria ◽  
Kasper Moth-Poulsen ◽  
Bo Albinsson
Keyword(s):  
Annihilation Photon ◽  
Triplet Triplet Annihilation

scholarly journals Effects of Temperature and Host Concentration on the Supramolecular Enantiodifferentiating [4 + 4] Photodimerization of 2-Anthracenecarboxylate through Triplet-Triplet Annihilation Catalyzed by Pt-Modified Cyclodextrins

Molecules ◽  
2019 ◽  
Vol 24 (8) ◽  
pp. 1502 ◽  
Author(s):  
Ming Rao ◽  
Wanhua Wu ◽  
Cheng Yang
Keyword(s):  
Light Emitting Diode ◽  
Temperature Dependency ◽  
Light Emitting ◽  
Modified Cyclodextrins ◽  
Direct Irradiation ◽  
Visible Light Driven ◽  
Significant Temperature ◽  
Effects Of Temperature ◽  
532 Nm ◽  
Triplet Triplet Annihilation

Visible-light-driven photocatalytic supramolecular enantiodifferentiating dimerization of 2-anthracenecarboxylic acid (AC) through triplet-triplet annihilation (TTA), mediated by the Schiff base Pt(II) complex (Pt-1, Pt-2, and Pt-3) was studied. The host concentration and the temperature effects on the stereoselectivity were comprehensively investigated. Increasing the concentration of sensitizers/hosts significantly enhanced the conversion of the photoreaction but led to reduced enantioselectivities of the chiral photodimers 2 and 3 when the photoreaction was triggered by a 532 nm laser, which was in contrast with the results obtained by direct irradiation of AC with a 365 nm light-emitting diode (LED) lamp, due to the aggregation of the sensitizer/host in water. The cyclization of AC through triplet-triplet annihilation displayed significant temperature dependency when Pt-3 was employed as the sensitizer/host. Increasing the temperature from 0 °C to 30 °C with 5% equiv. of Pt-3 led to a great increase of the ee of 2 from 2.1% to 31.6%. However, hardly any temperature dependency was observed when the photodimerization was mediated by other sensitizers and/or hosts, or the photoreaction was triggered directly with a 365 nm LED lamp.

scholarly journals Assessment of transferrin recycling by Triplet Lifetime Imaging in living cells

2012 ◽  
Vol 3 (10) ◽  
pp. 2526 ◽  
Author(s):  
Matthias Geissbuehler ◽  
Zuzana Kadlecova ◽  
Harm-Anton Klok ◽  
Theo Lasser
Keyword(s):  
Living Cells ◽  
Lifetime Imaging ◽  
Triplet Lifetime
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