Fluorescence-quenching studies and temperature dependence of fluorescence quantum yield, decay time and intersystem crossing activation energy of TPB

Hanagodimath, S.M.; Siddlingeshwar, B.; Thipperudrappa, J.; Hadimani, S. K. B.

doi:10.1016/j.jlumin.2008.10.016

Cited by 9 publications

(4 citation statements)

References 19 publications

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“…At lower temperatures, these free energy carriers undergo radiative decay because the quantity of the photon traps and structural defects are decreased due to lower molecular motion within the extended structure of the PEPy‐COF. [ 61–68 ] After 370 K, no noticeable changes in the fluorescence intensity were observed. Generally, the fluorescence intensity depends on different processes, but the inherent fluorescence of a fluorophore should be independent of temperature.…”

Section: Resultsmentioning

confidence: 99%

Pyrene‐Based Polyimide Covalent Organic Framework with Temperature‐Dependent Fluorescence

Zadehnazari

Khosropour

Altaf

et al. 2023

Advanced Optical Materials

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The synthesis of a fluorescent covalent organic framework (COF) using perylene and pyrene building blocks (PEPy-COF), via a one-pot condensation reaction is reported. PEPy-COF is crystallized into 2D nanosheets with a cubic and prismatic crystalline morphology and demonstrates structural stability at temperatures up to 500 °C. The structural morphology is confirmed using X-ray diffraction and atomic-level simulations. These 2D porous polymer sheets form a tetragonal framework that is found to have a high specific surface area of 772 m 2 g −1 . Based on the definition of porous materials, the network is mesoporous with an observed pore size of 3.03 nm, which is in good agreement with the material's calculated pore size. The experimentally obtained HOMO-LUMO band gap is 2.62 eV, confirming the semiconducting nature of PEPy-COF. PEPy-COF emits a shiny blue luminescence under UV and visible light. This luminescence intensity is temperature-dependent in solvents with different polarities and dielectric constants demonstrating that the PEPy-COF has potential use in a wide range of temperature-sensing devices. The fluorescence intensity ratio is similar for different temperatures under ultra-sound conditions and varying solvents.

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Section: Resultsmentioning

confidence: 99%

Pyrene‐Based Polyimide Covalent Organic Framework with Temperature‐Dependent Fluorescence

Zadehnazari

Khosropour

Altaf

et al. 2023

Advanced Optical Materials

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“…The average PL lifetime of CsPbBr 3 microcapsules was 15.98 ns, while that of pristine CsPbBr 3 was 9.61 ns. Surface quenching often leads to shorter lifetimes [38,39]. The longer lifetime implies that there are fewer surface traps in the CsPbBr 3 microcapsules.…”

Section: Resultsmentioning

confidence: 99%

Microencapsulation of Lead-Halide Perovskites in an Oil-in-Fluorine Emulsion for Cell Imaging

et al. 2023

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The superior optical properties of lead-halide perovskites (LHPs) inspired significant research in cell imaging applications; many encapsulating processes have improved perovskite stabilities with comparable biosafety. Herein, facile solvent evaporation encapsulation based on an oil-in-fluorine emulsion for aqueous-stable and extremely nontoxic LHP microcapsules is described. Perfluorooctane dispersed the emulsifier fluorocarbon surfactant to form a continuous fluorine phase, while LHPs and polymethylmethacrylate (PMMA) were dispersed in 1,2-dichloroethane, then emulsified in the fluorine phase to form an oil-in-fluorine emulsion. CsPbBr3 microcapsules with a dense PMMA shell that protect fragile CsPbBr3 from the external environment and inhibit lead ion release were obtained after solvent evaporation. The CsPbBr3 microcapsules not only retained 91% of fluorescence intensity after exposure to water for 30 d but also possess extremely low cytotoxicity for MCF-7 cells. After exposure to 2 mg/mL of CsPbBr3 microcapsules for 48 h, the cell viability remained >90%. The intracellular uptake of CsPbBr3 microcapsules indicates its potential use in cell imaging.

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“…In the light guide coatings, the TPB is suspended in an acrylic matrix which leads to a slight broadening of the emission spectrum compared to the spectrum from the plates. This is an expected effect-TPB fluorescence has been shown to have dependence upon its microenvironment [68,[71][72][73][74], and reference [68] demonstrated spectral broadening in the presence of a polystyrene substrate. Using the monochromator described for the plate spectrum studies, the light guide coating spectrum was measured in guided mode.…”

Section: Secondary System: Acrylic Light Guides For Randdmentioning

confidence: 99%

Design and construction of the MicroBooNE detector

et al. 2017

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This paper describes the design and construction of the MicroBooNE liquid argon time projection chamber and associated systems. MicroBooNE is the first phase of the Short Baseline Neutrino program, located at Fermilab, and will utilize the capabilities of liquid argon detectors to examine a rich assortment of physics topics. In this document details of design specifications, assembly procedures, and acceptance tests are reported.

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Fluorescence-quenching studies and temperature dependence of fluorescence quantum yield, decay time and intersystem crossing activation energy of TPB

Cited by 9 publications

References 19 publications

Pyrene‐Based Polyimide Covalent Organic Framework with Temperature‐Dependent Fluorescence

Pyrene‐Based Polyimide Covalent Organic Framework with Temperature‐Dependent Fluorescence

Microencapsulation of Lead-Halide Perovskites in an Oil-in-Fluorine Emulsion for Cell Imaging

Design and construction of the MicroBooNE detector

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