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Fluorescence Studies of Dy3+ Ions in Silica Sol Gel
摘要： The fluorescence properties of Dy3+ ion are utilized to study the structural changes during the gel to glass transition of the silica xerogels. The fluorescence intensity ratio (yellow to blue, Y/B) is used as a measure of the symmetry of rare earth ion environment during the gel-glass conversion. The high value of the intensity ratio of gel heated to 1000 °C showed that the rare earth ions are embedded in the glassy silica network with an asymmetric environment. Fluorescence study is also used to characterize the effect of metal cation co-dopants on the state of aggregation of rare earth ions in silica sol gel. The addition of co-dopants inhibits the clustering of rare earth ions and promotes better dispersion. The inhibition of clustering is correlated with the generation of strong crystal field bonding sites for rare earth ions in the presence of co-dopants.
关键词： Rare earth doped materials,Luminescence,Sol gel
更新于2025-09-19 17:15:36
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Fabrication of low loss channel waveguide in tungsten-tellurite glass by 11?MeV carbon ion microbeam for telecom C band
摘要： Channel waveguides were directly written in Er: TeO2W2O3 glass using 11 MeV C4+ ion microbeam with fluences in the range of 1·1014–5·1016 ion/cm2. The channel waveguides supported a single guided mode at λ = 1540 nm. Propagation losses of the as-irradiated channel waveguides were around 14 dB/cm. A 30-min thermal annealing at 150 °C in air reduced propagation losses at λ = 1400 nm to 1.5 dB/cm. This method produced channel waveguides with confinement and propagation losses comparable to or better than other current methods, such as MeV energy focused proton or helium ion beam writing.
关键词： Microstructure fabrication,Channel waveguides,Rare earth doped materials,Integrated optics,Optical design and fabrication
更新于2025-09-19 17:13:59
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Tracing of dye molecules in living plants through NaGdF4:Yb3+,Er3+ fluorescent nanoprobes
摘要： In this paper, we demonstrated trace of dye molecules in living plants. The NaGdF4:Yb3+,Er3+ nanoparticles probe was used to detect the rhodamine B(RhB) in bean sprout. It is found that the fluorescencedye can be efficiently imbibed during the growing process and the absorbance presented a position dependence effect, which was supported by the upconversion spectra and the fluorescent image characterization. In addition, the concentration of the residual RhB in bean sprout can be efficiently traced by the synthesized probe based on the fluorescent resonant energy transfer. Finally, the relation between the excitation power, concentration and the ratio of yellow to green emission are discussed in detail. These results can be helpful in understanding the RhB dye molecules absorbance process in vegetable growth and provide an efficient way to trace the residual dyes in vivo plant.
关键词： Upconversion nanoprobes,Rare-earth-doped materials,fluorescence,Biological sensing and sensors,luminescence
更新于2025-09-10 09:29:36
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Solar Blind UV Light Induced Photo‐Voltage from Transparent Y <sub/>2</sub> O <sub/>3</sub> : Eu‐PMMA Nanocomposite Film
摘要： Transparent inorganic-organic nanocomposite film (Y2O3: Eu-PMMA)W is fabricated for solar blind UV light photo-voltage response at room temperature. In suggested design, Y2O3: Eu nanoparticales with efficient visible luminescence excited under solar blind UV light is incorporated into an Y2O3: Eu-PMMA nanocomposite film coated onto a glass substrate, which converts solar blind UV light to visible light that is absorbed by the Si-detector. Photo-voltage response from the thin film Si-APD detector attached with the inorganic-organic nanocomposite film demonstrates a prospective application for solar blind UV light detection.
关键词： luminescence,UV detector,rare-earth-doped materials,solar blind UV light
更新于2025-09-04 15:30:14