scholarly journals Direct population of triplet excited states through singlet–triplet transition for visible-light excitable organic afterglow

2019 ◽  
Vol 10 (19) ◽  
pp. 5031-5038 ◽  
Author(s):  
Jie Yuan ◽  
Runfeng Chen ◽  
Xingxing Tang ◽  
Ye Tao ◽  
Shen Xu ◽  
...  
Keyword(s):  
Visible Light ◽  
Excited States ◽  
Excitation Wavelength ◽  
Triplet States ◽  
Ambient Conditions ◽  
Triplet Excited States ◽  
Triplet Transition ◽  
Triplet Absorption

Direct population of triplet states via singlet-to-triplet absorption red-shifts the excitation wavelength and improves the organic afterglow efficiency under ambient conditions.

scholarly journals Exploiting trifluoromethyl substituents for tuning orbital character of singlet and triplet states to increase the rate of thermally activated delayed fluorescence

2020 ◽  
Vol 4 (12) ◽  
pp. 3602-3615 ◽  
Author(s):  
Jonathan S. Ward ◽  
Andrew Danos ◽  
Patrycja Stachelek ◽  
Mark A. Fox ◽  
Andrei S. Batsanov ◽  
...  
Keyword(s):  
Excited States ◽  
Organic Molecules ◽  
Delayed Fluorescence ◽  
Triplet States ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Conjugated Organic Molecules ◽  
Singlet And Triplet States ◽  
Triplet Excited States ◽  
Orbital Character

This work shows that trifluoromethyl (CF3) substituents can be used to increase the rate of thermally activated delayed fluorescence (TADF) in conjugated organic molecules by tuning the excitonic character of the singlet and triplet excited states.

scholarly journals Detecting triplet states in opto-electronic and photovoltaic materials and devices by transient optically detected magnetic resonance

2021 ◽  
Author(s):  
Jeannine Grüne ◽  
Vladimir Dyakonov ◽  
Andreas Sperlich
Keyword(s):  
Excited States ◽  
Semiconductor Materials ◽  
Intermediate Step ◽  
Spectroscopic Methods ◽  
Triplet States ◽  
Organic P ◽  
Photovoltaic Materials ◽  
Organic Semiconductor Materials ◽  
Optically Detected ◽  
Triplet Excited States

Triplet excited states in organic semiconductor materials and devices are notoriously difficult to detect and study with established spectroscopic methods. Yet, they are a crucial intermediate step in next-generation organic...

scholarly journals Light-induced catalytic and cytotoxic properties of phosphorescent transition metal compounds with a d 8 electronic configuration

2013 ◽  
Vol 371 (1995) ◽  
pp. 20120126 ◽  
Author(s):  
Wai-Pong To ◽  
Taotao Zou ◽  
Raymond Wai-Yin Sun ◽  
Chi-Ming Che
Keyword(s):  
Transition Metal ◽  
Excited States ◽  
Electronic Configuration ◽  
Transition Metal Compounds ◽  
Triplet States ◽  
Oxygen Species ◽  
Bimolecular Reactions ◽  
Metal Compounds ◽  
Light Emitting ◽  
Triplet Excited States

Transition metal compounds are well documented to have diverse applications such as in catalysis, light-emitting materials and therapeutics. In the areas of photocatalysis and photodynamic therapy, metal compounds of heavy transition metals are highly sought after because they can give rise to triplet excited states upon photoexcitation. The long lifetimes (more than 1 μs) of the triplet states of transition metal compounds allow for bimolecular reactions/processes such as energy transfer and/or electron transfer to occur. Reactions of triplet excited states of luminescent metal compounds with oxygen in cells may generate reactive oxygen species and/or induce damage to DNA, leading to cell death. This article recaps the recent findings on photochemical and phototoxic properties of luminescent platinum(II) and gold(III) compounds both from the literature and experimental results from our group.

trans-Bis(alkylphosphine) platinum(ii)-alkynyl complexes showing broadband visible light absorption and long-lived triplet excited states

2014 ◽  
Vol 2 (45) ◽  
pp. 9720-9736 ◽  
Author(s):  
Huiru Jia ◽  
Betül Küçüköz ◽  
Yongheng Xing ◽  
Poulomi Majumdar ◽  
Caishun Zhang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Visible Light ◽  
Excited States ◽  
Light Absorption ◽  
Light Harvesting ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Visible Light Absorption ◽  
Triplet Excited States

Broadband visible light-harvesting bis(alkylphosphine) platinum(ii)-alkynyl complexes based on resonance energy transfer were prepared and used for TTA upconversion.

Synthesis, Characterization, and Photophysics of a New Trinuclear Mercury(II) Complex of 1,3,5-Triethynylbenzene

2006 ◽  
Vol 59 (7) ◽  
pp. 434 ◽  
Author(s):  
Li Liu ◽  
Wai-Yeung Wong ◽  
Cheuk-Lam Ho
Keyword(s):  
Excited State ◽  
Photophysical Properties ◽  
Heavy Atom ◽  
High Energy ◽  
Intersystem Crossing ◽  
Spectroscopic Techniques ◽  
Triplet States ◽  
Ambient Conditions ◽  
Triplet Excited States ◽  
Atom Effect

A new trinuclear mercury(ii) complex of 1,3,5-triethynylbenzene [(MeHgC≡C)3(1,3,5-C6H3)] 1 was prepared in good yield by Hagihara’s dehydrohalogenation reaction of HgMeCl with [(HC≡C)3(1,3,5-C6H3)] under ambient conditions. This trimercury triacetylide complex’s structure was confirmed by common spectroscopic techniques and its photophysical properties were examined and compared with the isolobal gold(i) congener [{(PPh3)AuC≡C}3(1,3,5-C6H3)] 2. Our investigations indicate that the organic triplet emissions can be harvested by the heavy-atom effect of mercury which enables efficient intersystem crossing from the S1 singlet excited state to the T1 triplet excited state. The influence of Hg and Au centres on the phosphorescence efficiency and evolution of the lowest electronic singlet and triplet excited states is critically characterized. Both complexes 1 and 2 possess high-energy triplet states of 2.77–2.82 eV, in which the order of intersystem crossing rate follows the order Au > Hg.

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