59-69, Chemical Engineering Journal, Volume 170, Issue 1, 2011, pp. University of MarylandCollege Park, MD 20742-4111Phone: 301.405.3401Fax: 301.314.9525. By mixing different molar concentrations of V2O5 and CdO as reactants, and using the melt-quenching method, an evolution from crystalline vanadate compounds to amorphous materials was produced. The dispersion is a measure of the change of the refractive index with wavelength. By scanning electron microscopy, depending on the mol% of the reactants, different morphological structures for each crystalline and amorphous material were recorded. Physical, structural, thermal and spectroscopic properties are investigated by various techniques. About 75% of UVA passes through ordinary glass. Among these, only the brighter bands were chosen, in order to obtain the best-fit intensity parameters (Ωλ) with the Judd–Ofelt theory. About Optics & Photonics Topics OSA Publishing developed the Optics and Photonics Topics to help organize its diverse content more accurately by topic area. We use cookies to help provide and enhance our service and tailor content and ads. absorption bands, this can be clearly seen in figure 2-1. Fused Silica is used for UV and visible components. 2H2O, H3BO3, Li2O, TeO2, and Sm2O3. Hall measurements confirm p-type nature of AgGaTe2. Glass that is transparent to visible light absorbs nearly all UVB. Moreover, the maximum σe × full-width-at-half-maximum is 327.8 for 5 mol% Er3+-doped PAZ glasses. Description: A bright point source with condenser lens and iris is focused by a 10 cm focal length cylindrical convex lens onto a slit, which is in turn focused onto a distant screen by a 20 cm focal length spherical convex lens. Fig. Trivalent Samarium doped multi-component Cadmium Lead Sodium Fluoro-Phosphate glass was prepared and characterized through optical absorption, emission and excitation measurements. The spectrum of white light, without any absorbing glass, is shown at the right. Here, similar pre-peaks are observed (at 8 nm− 1) which are interpreted with an analogous model. The quenching of the PL intensity occurs at the Sm3+ concentration above 1%. The as-prepared glasses show deep green (550 nm) as well as NIR (1532 nm) emission at 380 and 980 nm excitation wavelengths, respectively. To confirm the unit cell parameters of the grown silver gallium telluride (AgGaTe2) crystal, single crystal X-ray diffraction studies were carried out. Gases have a more complicated absorption spectrum and almost all gases have absorption bands somewhere in the (mid) IR, where they absorb light. It is suggested that the maximum emission cross-section (σe) is 7.64 × 10− 21 cm2 at 1535 nm is observed for 3 mol% Er3+-doped PAZ glasses. Fig. Consequent to these observations, the heavy metal fluoride glasses doped with Ho3+ ions received much attention due to their wide transparency in the ultraviolet to infrared region. When light travels through a glass, the intensity of the light is typically reduced. The emission spectra consist of three sharp peaks at 562.5, 599, 645.5 nm within the 4f electronic configuration of Sm3+ ions and two feeble emission peaks at 691, 711 nm of Sm2+ ion at 402 nm excitation. Usually, standard optical qualification takes into account initial absorption (also named internal transmission), the induced absorption (laser resistivity, solarization) [4], and fluorescence [5], … A sample of glass doped with a chemical is placed in the beam just before the slit. The chemical composition of the samarium glass (1 M%) is as follows : 65TeO2+12B2O3+12P2O5+10Li2O We employed the quenching technique for samarium glass preparation reported in ref. The luminescence and absorption spectra have been discussed using a standard hypothesis Judd-Ofelt theory for a certain absorption transitions 6P3/2, 4I11/2, 6F11/2, 6F9/2, 6F7/2, 6F5/2, 6F3/2, 6H15/2, 6F1/2 and emission transitions 6H5/2, H7/2, 6H9/2 and H11/2 under 409 nm excitation of the Sm3+ ions. 58-66, Journal of Non-Crystalline Solids, Volume 357, Issue 4, 2011, pp. Atomistic models of the glasses with the maximum possible NGeO, with Na+ ions that find full charge compensation on NBO neighbors successfully reproduce the experimental NGeOs. There are more references available in the full text version of this article. The photoluminescence study indicated that the emission of the core-shell nanowires originated mainly from the ZnO shell. The optical band gap for AgGaTe2 is 1.8 eV. Enhanced red and orange fluorescence emissions of Sm3+ Rare earth (RE) ions were observed in sodium‑zinc tellurite glasses embedded with silver and gold nanoparticles (NPs). Photoluminescence (PL) spectra show three transitions of Sm3+: 4G5/2 → 6H5/2 (600 nm), 4G5/2 → 6H7/2 (564 nm) and 4G5/2 → 6H9/2 (645 nm). Proceed with a fast and secure checkout. The absorbance of a glass, shown in the figure above as a function of wavelength, is often used to describe the decrease in intensity of light as it travels through the glass. The system now shows the absorption spectrum of the glass. Among all the RE's, Sm3+ have provoked more importance due to their applications in the optical storage device, undersea communication, color displays, light sources for photodynamic therapy (PDT), Micro-beam Radiation Therapy (MRT) for cancer treatment and visible solid-state lasers [4–15].Generally, the emission spectra of Sm2O3 doped glasses show four emission peaks at 565, 602, 648 and 709 nm corresponds to the 4G5/2→6H5/2, 6H7/2, 6H9/2 and 6H11/2 transitions respectively [5,15–20].“The intense emission transition 4G5/2→6H7/2 is allowed magnetic dipole (MD), whereas; the 4G5/2→6H9/2 transition is allowed electric dipole (ED) transition” [16,21–23]. The Judd-Ofelt (J-O) intensity parameters evaluated from experimental oscillator strengths were used in estimating the various radiative parameters. https://doi.org/10.1016/S0025-5408(00)00267-1. All glasses having a silica base show a high absorption in the region of 2.8 to 4.5 J..I., which is caused by some combination of silica with water and other base materials of which the glass is composed. The glass selections available are neophane glass (left), holmium oxide glass (left center), and dydimium glass (right center). ♦ Silica Glass (SiO 2) Data Sheet ♦ Silica Glass (SiO 2) SDS ♦ Silica Glass (SiO 2) FDS (French) ♦ Silica Glass (SiO 2) Selection Guide. High-temperature heating was found to be effective in removing the core TeO2 nanowires. With the weak spectroscopic quality factors Ω4/Ω6 (0.76), we expect a relatively prominent infrared laser emission. The fine distribution of NPs in the glass matrix with an average diameter ~ 11.09 nm and ~3.86 nm for Ag and Au NPs respectively were confirmed by using transmission electron microscope (TEM). Far infrared light is absorbed and emitted by glass at room temperature. The corresponding behavior is described by a general equation which is based on the mole fractions of Na2O, P2O5, and GeO2 and the ratio n(NBO)/n(Na). The visible emission band was blue-shifted with increasing annealing temperature. A white light spectrum is obtained by inserting an equilateral prism just after the spherical lens. This absorption happens when the energy of a photon of light matches the energy needed to excite an electron within the glass to its higher energy state, and the photon is absorbed by the glass. This paper reports a novel method for fabricating nanotubes, in which the nanowire-templates were removed by simple heating in air. Copyright © 2020 Elsevier B.V. or its licensors or contributors. 1a and b show the absorption spectra of samarium glass measured on a Shimadzu. Dark conductivity measurements from room temperature to 450 K were made for the whole set of samples. GSm5 glass emits high intense red emission for 4G5/2 → 6H7/2 transition suggests the suitability of these glasses for red light emission or laser applications in visible region. From the evaluated emission cross-sections, quantum efficiency, branching ratios and CIE co-ordinates, it is concluded that 1 mol% Sm3+ ions in these glasses are aptly suitable to fabricate reddish-orange luminescent devices. When optical material is exposed to light, a certain part of it is usually absorbed by the glass or impurities.