Exploring the photoexcited electron transfer dynamics in artificial sunscreen PBSA-coupled biocompatible ZnO quantum dots

Abstract

Frequent exposure to ultraviolet (UV) radiation without any protection turns out to be a fatal threat to skin cancer. This can be forestalled by the direct application of sunscreen cosmetic...

Enhancing the FRET by tuning the bandgap of acceptor ternary ZnCdS quantum dots

“…The fluorescence quantum yield ( Ø D = 0.315) of ensulizole is calculated by relative method 56 making use of fluorescein (in 0.1 M aqueous NaOH) as a reference fluorophore. 57 It is evident from eqn (5) that energy transfer ( E ) exclusively depends on the difference in the PL decay lifetime of the donor–acceptor system and the sole donor.…”

Cu-Enhanced Efficient Förster Resonance Energy Transfer in PBSA Sunscreen-Associated Ternary CuxCd1–xS Quantum Dots

“… 45 The Förster or critical distance ( R o ) is the distance at which the energy-transfer efficiency is 50% and is determined using eq 3 , and the spectral overlapping region by using the integral ( J (λ)) between the PL spectrum of PBSA sunscreen and the absorption spectra of CCS QDs is computed, eq 4 where ϕ D , k 2 , ϵ A (λ), n , and F D (λ) denote the fluorescence quantum yield of the donor in the absence of the acceptor, the orientation factor for the randomly oriented PBSA-CCS system, the molar extinction coefficient (M –1 cm –1 ) of the acceptor, the refractive index of the medium ( n = 1.4), and the corrected emission intensity of PBSA in the wavelength range of λ to λ + Δλ with the total intensity normalized to 1, respectively. The quantum yield of PBSA (ϕ D = 0.315) is estimated by a relative method 46 employing fluorescein (in 0.1 M aqueous NaOH) as a reference fluorophore 47 where K T ( r ) and “ r ” in the above equations are the rate constant for the non-radiative energy-transfer process and the actual distance between donor and acceptor moieties, respectively. Different types of FRET parameters mentioned in Table 2 are appraised by using equations from 1 to 6.…”

Photon-Induced Electron Transfer in Ligand-Stabilized Monoclinic CsPbBr3 and Alanine-Functionalized Graphene Heterostructures

“…PL spectra and kinetics of NCs were examined with the help of a PicoQuant Fluo Time FT-300 steady-state and time-resolved fluorescence spectrometer that works on the time-correlated single photon counting (TCSPC) principle. The NC samples were dispersed in toluene and excited with a pulsed light-emitting diode (LED) excitation source at 306 nm and the PL was collected at ambient conditions as reported previously. , Cyclic voltammetry (CV) was carried out to find band edges on an electrochemical workstation (CH166B). Absolute PLQYs were collected on a spectrofluorometer (FS5, Edinburgh, U.K.) equipped with a 15 cm integrating sphere and a xenon lamp as a source of light.…”

“…The NC samples were dispersed in toluene and excited with a pulsed light-emitting diode (LED) excitation source at 306 nm and the PL was collected at ambient conditions as reported previously. 30,31 Cyclic voltammetry (CV) was carried out to find band edges on an electrochemical workstation (CH166B). Absolute PLQYs were collected on a spectrofluorometer (FS5, Edinburgh, U.K.) equipped with a 15 cm integrating sphere and a xenon lamp as a source of light.…”