Laser polarization and phase control of up-conversion fluorescence in rare-earth ions
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We theoretically and experimentally demonstrate the up-conversion fluorescence control via resonance-mediated two-photon absorption in rare-earth ions by varying both the laser polarization and phase. We show that both the laser polarization and phase can control the up-conversion fluorescence and the up-conversion fluorescence intensity is decreased when the laser polarization changes from linear through elliptical to circular. We also show that the laser polarization will affect the control efficiency of the up-conversion fluorescence by varying the laser phase and the circular polarization will reduce the control efficiency. Furthermore, we suggest that the control efficiency by varying the laser polarization and the effect of the laser polarization on the control efficiency by varying the laser phase can be artificially manipulated by controlling the laser spectral bandwidth. This optical control method opens a new opportunity to control the up-conversion fluorescence of rare-earth ions, which may have significant impact on the related applications of rare-earth ions.Gravimetric analysis
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Five 2-(2-hydroxyphenyl)benzimidazole fluorescent compounds were synthesized,their structures and fluorescent properties were measured.The paper discussed the relationship of fluorescent characteristics of the fluorescent intensity,fluorescent wave,Stoke′s shift,quantum yield of all the fluorescent compounds synthesized between the substituting groups.
Benzimidazole
Quantum yield
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Europium
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Under the experimental conditions, the fluorescence reflectance of fabrics improved with the increase of the concentration of fluorescent dyes, but it showed downtrend over a certain concentration; the fluorescence reflectance was the highest at about pH = 5; The fluorescence reflectance of dyed fabrics was improved by fluorescence brightening agent (FBA), when the concentration of FBA in Fluorescent Yellow 2GL was increased from 0.1% to 5%, the fluorescence reflectance was improved from 8.43% to 18.59%, FBA only improved the brightness of non-fluorescent dyes, and no fluorescence was observed, the fluorescence reflectance of fabrics dyed with fluorescent dyes was lowered with the adding of non-fluorescent dyes.
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Based on a change in structure between spirocyclic (non-fluorescent) and ring-open (fluorescent) forms of rhodamine-based dyes, a new fluorescent and colorimetric Cu2+ probe was designed and synthesized. Upon treatment with Cu2+, the weakly fluorescent probe exhibited a strong fluorescence response with high selectivity. In addition, the turn-on fluorescent probe upon the addition of Cu2+ was applied in live cell imaging.
Rhodamine
Live cell imaging
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Three compounds of 3-pyridin-3-yl-indolizines a,b and c were prepared.The fluorescence spectra of these compounds in different pH buffer solutions were studied.The results indicate that these three compounds all can emit strong blue fluorescent,and the fluorescence properties were affected apparently by the pH data.With the increasing of the pH,the fluorescent intensity of these three compounds all can be increased,and the emission wavelength were all red shifted,but the degrees of the increasing and red shift were obviously different.Among them,the fluorescent intensity of compounds c and a can be increased 200and 150fold,while the emission peaks of compounds b and a shifted by 49 and 30nm,respectively.
Red shift
Blueshift
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