Analysis of the Photophysical Behavior and  Rotational-Relaxation Dynamics of Coumarin 6 in Nonionic Micellar Environments: The Effect of Temperature

Ruiz, C. Carnero; Hierrezuelo, J. M.; Molina-Bolı́var, J.A.

doi:10.3390/molecules201019343

Cited by 24 publications

(8 citation statements)

References 50 publications

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“…Coumarins have been used as sensors for broad varieties of analytes, including cations, anions, small molecule toxicants, and biological macromolecules . Their sensitive emission spectra with a strong dependence on the local microenvironment makes coumarins excellent sensors for such environments, and their favorable photophysical properties overall facilitate their usage in high performance luminescent sensing systems. , …”

Section: Common Fluorophoresmentioning

confidence: 99%

Supramolecular Luminescent Sensors

2018

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There is great need for stand-alone luminescence-based chemosensors that exemplify selectivity, sensitivity, and applicability and that overcome the challenges that arise from complex, real-world media. Discussed herein are recent developments toward these goals in the field of supramolecular luminescent chemosensors, including macrocycles, polymers, and nanomaterials. Specific focus is placed on the development of new macrocycle hosts since 2010, coupled with considerations of the underlying principles of supramolecular chemistry as well as analytes of interest and common luminophores. State-of-the-art developments in the fields of polymer and nanomaterial sensors are also examined, and some remaining unsolved challenges in the area of chemosensors are discussed. CONTENTS 4.4. Explosives 4.5. Pharmaceutical Agents 4.6. Biologically Relevant 4.6.1. Adenosine Triphosphate (ATP)

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Section: Common Fluorophoresmentioning

confidence: 99%

Supramolecular Luminescent Sensors

2018

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“…Slightly different values are reported for absorbance of coumarin 6 mixtures. 44,45 A good set of input parameters would improve the model prediction.…”

Section: Experiments a Angle-resolved Pl Spectramentioning

confidence: 99%

Angle-resolved photoluminescence spectrum of a uniform phosphor layer

Fujieda

Ohta

2017

AIP Advances

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A photoluminescence spectrum depends on an emission angle due to self-absorption in a phosphor material. Assuming isotropic initial emission and Lambert-Beer’s law, we have derived simple expressions for the angle-resolved spectra emerging from the top and bottom surfaces of a uniform phosphor layer. The transmittance of an excitation light through the phosphor layer can be regarded as a design parameter. For a strongly-absorbing phosphor layer, the forward flux is less intense and more red-shifted than the backward flux. The red-shift is enhanced as the emission direction deviates away from the plane normal. When we increase the transmittance, the backward flux decreases monotonically. The forward flux peaks at a certain transmittance value. The two fluxes become similar to each other for a weakly-absorbing phosphor layer. We have observed these behaviors in experiment. In a practical application, self-absorption decreases the efficiency of conversion and results in angle-dependent variations in chromaticity coordinates. A patterned phosphor layer with a secondary optical element such as a remote reflector alleviates these problems.

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“…The 2-0 transition is non-resonant and relates to a non-radiative lifetime (τ 20 ). Intrinsic non-radiative decay of C6 is on the order of 11.8 ns43 which is significantly longer than any other time scale in the system dynamics. Therefore, we neglect the effect of the intrinsic non-radiative decay and use the parameter τ 20 to model the effect of additional non-radiative energy transfer taking place upon SPI-MC isomerization.…”

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confidence: 93%

All-Optical Emission Control and Lasing in Plasmonic Lattices

et al. 2020

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We report on reversible all-optical emission control and lasing in plasmonic nanoparticle lattices. By incorporating photochromic molecules into the liquid gain medium composed of organic fluorescent molecules, we realize all-optical control over gain and absorption, the two key parameters associated with both conventional and nanoscale lasing. We demonstrate reversible photoswitching between two distinct modes of operation, 1) spontaneous emission to the lattice mode, characterized by broad emission linewidth, low emission intensity and large angular distribution and 2) lasing action, characterised by very narrow (sub-nm) linewidths due to emergence of increased gain and temporal coherence in the system, approximately three orders of magnitude increase in emission intensity, and narrow 0.7 degree angular divergence of the beam.A rate-equation model is employed to describe the operation of the switchable plasmonic laser. Our results provide the first demonstration of optically tunable losses 1 in plasmonic lattice lasers, which is an important milestone for the development of active plasmonics and paves the way for ultrafast all-optical switching of plasmonic nanolasers.

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Analysis of the Photophysical Behavior and Rotational-Relaxation Dynamics of Coumarin 6 in Nonionic Micellar Environments: The Effect of Temperature

Cited by 24 publications

References 50 publications

Supramolecular Luminescent Sensors

Supramolecular Luminescent Sensors

Angle-resolved photoluminescence spectrum of a uniform phosphor layer

All-Optical Emission Control and Lasing in Plasmonic Lattices

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