Fluorescence Spectroscopy Principles

Albani, Jihad René

doi:10.1002/9780470692059.ch7

Cited by 7 publications

(1 citation statement)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The incorporation of dye into the host NLC matrix leads to the nonlinear increment of PL intensity. This change in PL emission intensity might be caused by the change in optical density of the E204 system with the inclusion of guest azo-dye in it since the two quantities are related to each other according to the following relation given in eq 3 : I PL ( λ ) = 2 .3 I o ϵ false( λ false) c l φ PL where φ PL is the photoluminescence quantum yield, I o is the intensity of incident radiation, and ϵ (λ) cl is the optical density of the system with c as solution concentration and l as optical path length. From eq 3 , we see that the PL intensity varies in direct proportion with the optical density (ϵ c l ).…”

Section: Resultsmentioning

confidence: 99%

Inquisitive Optical and Electro-Optical Attributes of Azo-Dye Dispersed Nematic Liquid Crystal for Applications in Wavelength-Tunable Optical Filters

Agarwal,

Singh,

Tripathi

et al. 2023

J. Phys. Chem. C

View full text Add to dashboard Cite

The requirement of selecting a desired wavelength channel from a number of available wavelengths is of great research interest for application in advanced light-wave systems encompassing high-density wavelength-division multiplexed networks. Currently, available devices generally require a high power and complex instrumentation. In the present work, the performance parameters of a novel functional composite material have been augmented for wavelength selection purposes to meet the limitations of the existing technologies. The active material comprises commercially available nematic LC (E204) dispersed with optimized concentration of an organic azo-dye (methyl red crystals). A prototype of a LC-based optical filter has been fabricated, which tends to exhibit superior enhancement in the tunability range of transmitted wavelength and intensity of incident light with voltage control while operating at around 34% lower threshold voltage and a much faster (∼86.63%) response rate. The astounding features of this study include lowering of rise time and fall time of the optimized material composition by around 71.03 and 89.94%, respectively. The fabricated device structure serves as a potential candidate to be employed as a tunable filter. The spectral response shifts toward shorter-wavelength on strengthening the applied electric field across it, as confirmed by the transmission spectroscopic outcomes as well as polarized optical micrographs. Thermal stability of the device was observed to be enhanced for the system having higher concentrations of guest dye. Additionally, the system exhibits modulated photoluminescence emission and notable charge-storage capability with approximately 43% enhancement in capacitance that shall be further explored for future technologies based on energy harvesting purposes.

show abstract

Section: Resultsmentioning

confidence: 99%

Inquisitive Optical and Electro-Optical Attributes of Azo-Dye Dispersed Nematic Liquid Crystal for Applications in Wavelength-Tunable Optical Filters

Agarwal,

Singh,

Tripathi

et al. 2023

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

Synthesis and Characterization of the Hemi‐Salen Ligands and Their Triboron Complexes: Spectroscopy and Examination of Anticancer Properties

Kılıç

Koyuncu

Durgun

et al. 2017

Chemistry & Biodiversity

View full text Add to dashboard Cite

The synthesis, spectroscopic properties, and in vitro cytotoxicity activity of a series of various salen-based triboron complexes have been designed and prepared from hemi-salen (L 1 H 3 -L 4 H 3 ) ligands and BF 3 ÁEt 2 O or BPh 3 under simple reaction conditions. The hemi-salen (L 1 H 3 -L 4 H 3 ) ligands and their BF 2 or BPh 2 chelating triboron complexes were characterized by means of NMR ( 1 H, 13 C, 19 F, and 11 B) spectra, FT-IR spectra, UV/VIS spectra, fluorescence spectra, mass spectra, melting point, as well as elemental analysis. The triboron [L (1 -4) (BF 2 ) 3 ] and [L (1 -4) (BPh 2 ) 3 ] complexes were investigated for their absorption and emission properties, and these complexes are also good chelates towards boron(III) fragments such as BF 2 or BPh 2 quantum yield in solution reaching up to 38%. The hemisalen (L 1 H 3 -L 4 H 3 ) ligands and their BF 2 or BPh 2 chelating triboron complexes were tested for the in vitro anticancer activity against various cancer and normal cells (HeLa, DLD-1, ECC-1, PC-3, PNT-1A, and CRL-4010), and it was found that the cell viability of cancer cells was decreased while most of the healthy cells could still be viable. Also, the cytotoxicity studies showed that anticancer activity of hemi-salenligands showing the strongest cytotoxic effect in PC-3 cells were found to exhibit anticancer activity with apoptosis by increasing the level of ROS in the PC-3 cells.

show abstract