Fluorescence Quenching by Stimulated Emission

Lakowicz, Joseph R.; Gryczyński, Ignacy

doi:10.1007/0-306-47070-5_8

Cited by 16 publications

(31 citation statements)

References 79 publications

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“…S3). Typically, a process no shorter than one tenth of the system's time resolution can be extracted by applying convolution fitting with the instrument response function (IRF) 27,28 . In this manner, we can infer that the interexciton relaxation time is t 2p{1s 5 600 6 150 fs and that the recombination time is t rec~5 :0 + 0:2 ps.…”

Section: Resultsmentioning

confidence: 99%

Nonlinear optical selection rule based on valley-exciton locking in monolayer ws2

Xiao¹,

Ye²,

Wang³

et al. 2015

Light Sci Appl

109

115

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Optical selection rules fundamentally determine the optical transitions between energy states in a variety of physical systems, from hydrogen atoms to bulk crystals such as gallium arsenide. These rules are important for optoelectronic applications such as lasers, energy-dispersive X-ray spectroscopy, and quantum computation. Recently, single-layer transition metal dichalcogenides have been found to exhibit valleys in momentum space with nontrivial Berry curvature and excitons with large binding energy. However, there has been little study of how the unique valley degree of freedom combined with the strong excitonic effect influences the nonlinear optical excitation. Here, we report the discovery of nonlinear optical selection rules in monolayer WS 2 , an important candidate for visible 2D optoelectronics because of its high quantum yield and large direct bandgap. We experimentally demonstrated this principle for second-harmonic generation and two-photon luminescence (TPL). Moreover, the circularly polarized TPL and the study of its dynamics evince a sub-ps interexciton relaxation (2p R 1s). The discovery of this new optical selection rule in a valleytronic 2D system not only considerably enhances knowledge in this area but also establishes a foundation for the control of optical transitions that will be crucial for valley optoelectronic device applications such as 2D valley-polarized THz sources with 2p-1s transitions, optical switches, and coherent control for quantum computing.

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Section: Resultsmentioning

confidence: 99%

Nonlinear optical selection rule based on valley-exciton locking in monolayer ws2

Xiao¹,

Ye²,

Wang³

et al. 2015

Light Sci Appl

109

115

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“…[10] Fluorescence of tyrosine is almost totally quenched in most native proteins if it is ionized or near an amino group, a carboxyl group, or a tryptophan residue. [12,13] HSA has 18 tyrosine residues (shown in Figure 1) among which only one exists in subdomain IIA (Tyr263 in Figure 1). We estimated the distances between each tyrosine and Trp-214 from the crystal structure shown in Figure 1.…”

mentioning

confidence: 99%

Exploring the Drug‐Binding Site Sudlow I of Human Serum Albumin: The Role of Water and Trp214 in Molecular Recognition and Ligand Binding

Abou‐Zied

Al-Lawatia

2010

ChemPhysChem

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Choosy: Three hydroxyquinolines (HQs) are used as probes to reveal more details about the binding nature of one of the major drug‐binding sites of human serum albumin (Sudlow I) and to unravel the local environment around the probes in the binding site. The results (see picture) indicate the existence of water in the binding site and that a selective interaction between HQs and Trp214 in the native state unmasks the tyrosine fluorescence.

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“…For dynamic quenching, the decrease in fluorescence intensity is described by Stern-Volmer equation (Lakowicz, 2002). .In amide II the higher shift occurs at the major peak 1534-1538 cm -1 .…”

Section: Fluorescence Spectroscopymentioning

confidence: 99%

Interaction of Retinol with HSA using Spectroscopic Techniques

Alsamamra¹,

Abusharkh²,

Darwish³

et al. 2017

IJSR

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Abstract:The interaction between retinol and HSA has been investigated using UV-absorption spectrophotometry, fluorescence spectroscopy and Fourier Transform Infrared (FT-IR) spectroscopy.UV-absorption spectrophotometry showed an increase in the absorption intensity with increasing the molecular ratios of retinol to HSA, it is found that the value of the binding constant is estimated to be1.7176×10 2 M -1 . FTIR spectroscopy is used in the mid infrared region with Fourier self deconvolution, second derivative, difference spectra, peak picking and curve fitting were used to determine the effect of Retinol on the protein secondary structure in the amides I, II and Ill regions. Analysis of FTIR absorbance spectra is found that the intensity of the absorption bands increased with increasing the molecular ratios of retinol, however from the deconvoluted and curve fitted spectra found that the absorbance intensity for α-helix decreases relative to β-sheets, this decrease in intensity is related to the formation of H-bonding in the complex molecules.

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Fluorescence Quenching by Stimulated Emission

Cited by 16 publications

References 79 publications

Nonlinear optical selection rule based on valley-exciton locking in monolayer ws2

Nonlinear optical selection rule based on valley-exciton locking in monolayer ws2

Exploring the Drug‐Binding Site Sudlow I of Human Serum Albumin: The Role of Water and Trp214 in Molecular Recognition and Ligand Binding

Interaction of Retinol with HSA using Spectroscopic Techniques

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