Kinetic insight into bimolecular upconversion: experiment and simulation

RSC Advances ◽  
2014 ◽  
Vol 4 (16) ◽  
pp. 8059-8063 ◽  
Author(s):  
Roland B. Piper ◽  
Megumi Yoshida ◽  
Daniel J. Farrell ◽  
Tony Khoury ◽  
Maxwell J. Crossley ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Direct Observation ◽  
Triplet Energy ◽  
Comprehensive Description ◽  
Experiment And Simulation ◽  
Triplet Energy Transfer ◽  
Insight Into

Direct observation of triplet energy transfer from sensitiser to emitter is modelled and provides comprehensive description of bimolecular upconversion.

Direct Observation of Efficient Triplet–Triplet Energy Transfer in Phosphorescent Organic Light-Emitting Diode

2013 ◽  
Vol 6 (5) ◽  
pp. 052104 ◽  
Author(s):  
Hirohiko Fukagawa ◽  
Takahisa Shimizu ◽  
Yoshichika Osada ◽  
Taisuke Kamada ◽  
Yukihiro Kiribayashi ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Direct Observation ◽  
Light Emitting Diode ◽  
Triplet Energy ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Triplet Energy Transfer

Direct Observation of the Intramolecular Triplet−Triplet Energy Transfer in Poly(aryl ether) Dendrimers

2006 ◽  
Vol 110 (9) ◽  
pp. 4047-4053 ◽  
Author(s):  
Jinping Chen ◽  
Shayu Li ◽  
Lu Zhang ◽  
Ying-Ying Li ◽  
Jie Chen ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Direct Observation ◽  
Aryl Ether ◽  
Triplet Energy ◽  
Triplet Energy Transfer

Direct observation of triplet energy transfer from semiconductor nanocrystals

Science ◽  
2016 ◽  
Vol 351 (6271) ◽  
pp. 369-372 ◽  
Author(s):  
C. Mongin ◽  
S. Garakyaraghi ◽  
N. Razgoniaeva ◽  
M. Zamkov ◽  
F. N. Castellano
Keyword(s):  
Energy Transfer ◽  
Direct Observation ◽  
Semiconductor Nanocrystals ◽  
Triplet Energy ◽  
Triplet Energy Transfer

Thymine Dimerization Induced by Oxidative DNA Lesions and Epigenetic Intermediates via Triplet-Triplet Energy Transfer

2020 ◽  
Author(s):  
Mauricio Lineros-Rosa ◽  
Antonio Francés-Monerris ◽  
Antonio Monari ◽  
Miguel Angél Miranda ◽  
Virginie Lhiaubet-Vallet
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Transient Absorption ◽  
Theoretical Calculations ◽  
Dna Lesions ◽  
Transient Absorption Spectroscopy ◽  
Triplet Energy ◽  
Pyrimidine Dimers ◽  
Triplet Energy Transfer ◽  
Dna Nucleobases

Interaction of nucleic acids with light is a scientific question of paramount relevance not only in the understanding of life functioning and evolution, but also in the insurgence of diseases such as malignant skin cancer and in the development of biomarkers and novel light-assisted therapeutic tools. This work shows that the UVA portion of sunlight, not absorbed by canonical DNA nucleobases, can be absorbed by 5-formyluracil (ForU) and 5-formylcytosine (ForC), two ubiquitous oxidative lesions and epigenetic intermediates present in living beings in natural conditions. We measure the strong propensity of these molecules to populate triplet excited states able to transfer the excitation energy to thymine-thymine dyads, inducing the formation of the highly toxic and mutagenic cyclobutane pyrimidine dimers (CPDs). By using steady-state and transient absorption spectroscopy, NMR, HPLC, and theoretical calculations, we quantify the differences in the triplet-triplet energy transfer mediated by ForU and ForC, revealing that the former is much more efficient in delivering the excitation energy and producing the CPD photoproduct. Although significantly slower than ForU, ForC is also able to harm DNA nucleobases and therefore this process has to be taken into account as a viable photosensitization mechanism. The present findings evidence a rich photochemistry crucial to understand DNA photodamage and of potential use in the development of biomarkers and non-conventional photodynamic therapy agents.

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