Photophysical characterization of new and efficient synthetic sunscreens

Losantos, Raúl; Lamas, Iker; Montero, Raúl; Longarte, Asier; Sampedro, Diego

doi:10.1039/c9cp01267b

Cited by 18 publications

(62 citation statements)

References 29 publications

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“…Of 3). 57 Their recent experiments agree with their computational findings (vida supra), and Case revealed that, following photoexcitation at the absorption maximum of the cyclohexenone core (see Figure 6), the vibrationally hot S1 state undergoes vibrational cooling, leading to population of the S1 minimum. Excited state population localised within the S1 minimum is subsequently trapped for at least 2.5 ns (a consequence of the maximum time-window of the experimental setup used by Woolley et al).…”

Section: Case Studiessupporting

confidence: 78%

Unravelling photoprotection in microbial natural products

Woolley

Stavros

2019

Science Progress

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Mycosporine-like amino acids have long been known as a natural form of photoprotection for fungi and cyanobacteria. This review will highlight the key time-resolved experimental and theoretical techniques unravelling their photochemistry and photophysics, and directly link this to their use in commercial skin-care products, namely as sunscreen filters. Three case studies have been selected, each having aided advancement in this burgeoning field of research. We discuss these studies in the context of photoprotection and conclude by evaluating the necessary future steps towards translating the photochemistry and photophysics insight of these nature derived sunscreen filters to commercial application.

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Section: Case Studiessupporting

confidence: 78%

Unravelling photoprotection in microbial natural products

Woolley

Stavros

2019

Science Progress

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“…PL steady‐state measurements were recorded with a spectrophotometer (PerkinElmer Instrument LS55). The femtosecond transient absorption measurements is described elsewhere 44. Ultrashort laser pulses were generated in an oscillator‐regenerative amplifier laser system (Coherent, Mantis‐Legend) that provides a 1 KHz train of 35 fs pulses at 800 nm.…”

Section: Methodsmentioning

confidence: 99%

“…The femtosecond transient absorption measurements is described elsewhere. [44] Ultrashort laser pulses were generated in an oscillatorregenerative amplifier laser system (Coherent, Mantis-Legend) that provides a 1 KHz train of 35 fs pulses at 800 nm. Pump pulse wavelength in the range 500-650 nm is obtained by means of sum frequency of the fundamental 800 nm and the signal beam of an optical parametric amplifier (Coherent, TOPAS), while the 400 nm is generated as the second harmonic of the fundamental beam.…”

Section: Methodsmentioning

confidence: 99%

Interface Engineering by Thiazolium Iodide Passivation Towards Reduced Thermal Diffusion and Performance Improvement in Perovskite Solar Cells

Salado

Andresini

Huang

et al. 2020

Adv Funct Materials

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Interface engineering has become one of the most facile and effective approaches to improve solar cells performance and its long‐term stability and to retard unwanted side reactions. Three passivating agents are developed which can functionalize the surface and induce hydrophobicity, by employing substituted thiazolium iodide (TMI) for perovskite solar cells fabrication. The role of TMI interfacial layers in microstructure and electro‐optical properties is assessed for structural as well as transient absorption measurements. TMI treatment resulted in VOC and fill factor enhancement by reducing possible recombination paths at the perovskite/hole selective interface and by reducing the shallow as well as deep traps. These in turn allow to achieve higher performance as compared to the pristine surface. Additionally, the TMI passivated perovskite layer considerably reduces CH3NH3+ thermal diffusion and degradation induced by humidity. The un‐encapsulated perovskite solar cells employing TMI exhibit a remarkable stability under moisture levels (≈50% RH), retaining ≈95% of the initial photon current efficiency after 800 h of fabrication, paving the way towards a potential scalable endeavor.

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“…Following up on their earlier theoretical and experimental work [ 89 ], Losantos et al [ 84 ] further investigated some of the UV filter candidates they previously synthesized using TEAS, fluorescence up-conversion and computational methods. The four studied molecules (9–12) can be found in Figure 14 [ 84 ]. CASPT2//CASSCF methodology [ 119 , 120 ] was implemented, similar to their previous study [ 89 ], to determine the deactivation pathway of molecule 11.…”

Section: Case Studiesmentioning

confidence: 99%

“…However, Losantos et al [ 84 ] and Woolley et al [ 85 ] have conducted such experiments on MAA motifs. In addition to these studies, complementary theoretical work has modelled the minimum energy relaxation pathways of MAAs and molecules alike, giving insight into their photoprotective mechanisms [ 84 , 86 , 87 , 88 , 89 , 90 ]. Section 2.2 of this review will primarily cover ultrafast spectroscopy and theoretical work conducted to the present date on MAAs and MAA motifs.…”

Section: Introductionmentioning

confidence: 99%

Unravelling the Photoprotective Mechanisms of Nature-Inspired Ultraviolet Filters Using Ultrafast Spectroscopy

2020

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There are several drawbacks with the current commercially available ultraviolet (UV) filters used in sunscreen formulations, namely deleterious human and ecotoxic effects. As a result of the drawbacks, a current research interest is in identifying and designing new UV filters. One approach that has been explored in recent years is to use nature as inspiration, which is the focus of this review. Both plants and microorganisms have adapted to synthesize their own photoprotective molecules to guard their DNA from potentially harmful UV radiation. The relaxation mechanism of a molecule after it has been photoexcited can be unravelled by several techniques, the ones of most interest for this review being ultrafast spectroscopy and computational methods. Within the literature, both techniques have been implemented on plant-, and microbial-inspired UV filters to better understand their photoprotective roles in nature. This review aims to explore these findings for both families of nature-inspired UV filters in the hope of guiding the future design of sunscreens.

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Photophysical characterization of new and efficient synthetic sunscreens

Abstract: The photoprotective capabilities of a family of synthetic MAA analogues have been investigated.

Cited by 18 publications

References 29 publications

Unravelling photoprotection in microbial natural products

Unravelling photoprotection in microbial natural products

Interface Engineering by Thiazolium Iodide Passivation Towards Reduced Thermal Diffusion and Performance Improvement in Perovskite Solar Cells

Unravelling the Photoprotective Mechanisms of Nature-Inspired Ultraviolet Filters Using Ultrafast Spectroscopy

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