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[IEEE 2018 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech) - Saint Petersburg, Russia (2018.10.22-2018.10.23)] 2018 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech) - Study of Oxyfluoride Glasses with Silver Molecular Clusters for Application in Sensoric and Optoelectronics
摘要： Temperature sensitivity of Oxyfluoride glasses with molecular silver clusters and samarium ions were studied. The experimental procedure for obtaining luminescence spectra at various temperatures is described. The perspective of using oxyfluoride glasses in fiber-optic temperature sensors is considered.
关键词： sensitive element,luminescence,Fiber-optical temperature sensor,oxyfluoride glass,spectrum,molecular clusters of silver
更新于2025-09-23 15:23:52
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Spectroscopic Properties of Er3+-Doped Particles-Containing Phosphate Glasses Fabricated Using the Direct Doping Method
摘要： The effect of the incorporation of Er2O3-doped particles on the structural and luminescence properties of phosphate glasses was investigated. A series of different Er2O3-doped TiO2, ZnO, and ZrO2 microparticles was synthesized using soft chemistry and then added into various phosphate glasses after the melting at a lower temperature than the melting temperature. The compositional, morphological, and structural analyses of the particles-containing glasses were performed using elemental mapping by field emission-scanning electron microscopy (FE-SEM) with energy dispersive x-ray spectrometry (EDS) and x-ray diffraction (XRD). Additionally, the luminescence spectra and the lifetime values were measured to study the influence of the particles incorporation on the spectroscopic properties of the glasses. From the spectroscopic properties of the glasses with the composition 50P2O5-40SrO-10Na2O, a large amount of the Er2O3-doped particles is thought to dissolve during the glass melting. Conversely, the particles were found to survive in glasses with a composition 90NaPO3-(10 ? x)Na2O-xNaF (with x = 0 and 10 mol %) due to their lower processing temperature, thus clearly showing that the direct doping method is a promising technique for the development of new active glasses.
关键词： oxyfluoride phosphate glass,direct particle doping,Er2O3-doped particles,Er3+ luminescence property,phosphate glass
更新于2025-09-23 15:22:29
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[IEEE 2017 5th International Conference on Instrumentation, Communications, Information Technology, and Biomedical Engineering (ICICI-BME) - Bandung, Indonesia (2017.11.6-2017.11.7)] 2017 5th International Conference on Instrumentation, Communications, Information Technology, and Biomedical Engineering (ICICI-BME) - Enhancement of Luminescence Light Yield of Ln <sup>3+</sup> Doped Glass By Oxyfluoride Glass Matrix
摘要： Glass is a good material which received attention for doping lanthanide ions. Glass doped Ln3+ ions can show luminescence, but not too strong light yield. It is well known that the host glass plays an important role in the enhancement. This paper has been described effect of Ln3+ ions (Sm3+, Eu3+ and Dy3+) doped oxyfluoride glass by comparing between oxide and oxyfluoride glasses. For the Sm3+ doped gadolinium calcium phosphate oxyfluoride glass, the highest emission peak was 598 nm under 401 nm excitation. While the emission light yield of oxyfluoride glass was higher than oxide glass due to the reduction of phonon and non-radiative losses. In case of Eu3+ doped oxyfluoride glass, the 612 nm emission under 394 nm excitation was observed. The light yield of oxyfluoride glass also was better than oxide glass. The Dy3+-doped phosphate oxide and oxyfluoride glasses were investigated. The luminescence light yield of oxyfluoride glass was more than oxide glass as well, owing to lower OH group of oxyfluoride glass, which can be confirmed by FTIR measurement. As described earlier, it concludes that the oxyfluoride glass is better than glass matrix when compared with oxide glass to enhance luminescence light yield for Ln3+ ions in glass matrix.
关键词： phonon energy,oxyfluoride glass,oxide glass,lanthanide ions
更新于2025-09-23 15:22:29
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Structure and Crystallization of Glasses in the MnNbOF5–BaF2–InF3 System
摘要： Glasses of the MnNbOF5–BaF2–InF3 system were prepared. The structure, thermal behavior, and crystallization of these glasses were studied by IR and Raman spectroscopy, differential scanning calorimetry (DSC), X-ray powder diffraction, and microscopy. The ions form a mixed glass network. Glass crystallization occurs in one or two steps depending on the component ratio. The major crystal phases are Ba3In2F12 and BaNbOF5. The obtainability of transparent crystal-glass samples in MnNbOF5–BaF2–InF3 glasses via heat treatment is shown.
关键词： fluoride glasses,structure,crystallization,oxyfluoride glasses
更新于2025-09-23 15:21:21
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Eu2+ and Mn2+ co-doped oxyfluoride glass ceramic for white color conversion of 400??nm UV-LED
摘要： SiO2–Na2O–Al2O3–LaF3 glasses doped with Eu2t and Mn2t were synthesized to fabricate an inorganic color converter for white LED. When Eu2t was formed within the glass matrix, the obtained glasses showed cyan emission under 400 nm excitation upon heat treatment and the emission peak has been shifted with the crystallization. White emission has been successfully achieved with the introduction of Mn2t which supplemented red emission. The glass ceramic has been mounted on a 400 nm UV-LED and successfully demonstrated its practical feasibility with color rendering index of 91.3. The effect of heat treatment and energy transfer between Eu2t and Mn2t has been discussed.
关键词： Mn2t,Eu2t,Oxyfluoride,Glass ceramic,LED
更新于2025-09-19 17:13:59
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Highly sensitive optical thermometers based on unconventional thermometric coupled levels of Tm <sup>3+</sup> following a Boltzmann-type distribution in oxyfluoride glass ceramics
摘要： Oxyfluoride glass ceramics (GCs) containing b-PbF2 nanocrystals (NCs) doped with Tm3+ and Yb3+ were synthesized by a conventional melt-quenching method and a subsequent glass crystallization route. In b-PbF2:Tm3+/Yb3+ GCs, Tm3+/Yb3+ is surrounded by fluoride with a low phonon energy, ensuring its intense emissions at 362 (1D2 - 3H6), 450 (1D2 - 3F4), 478 (1G4 - 3H6), 648 (1G4 - 3F4), 700 (3F2,3 - 3H6) and 800 (3H4 - 3H6) nm excited by 976 nm laser. Furthermore, temperature-dependent upconversion luminescence (UCL) behaviors of b-PbF2:Tm3+/Yb3+ GCs were systematically investigated to explore the thermometric performance with the assistance of the fluorescence intensity ratio (FIR) method by employing conventional TCELs of 3F2,3/3H4 following a Boltzmann distribution and two unconventional coupled levels of 3F2,3/1D2 and 3F2,3/1G4 governed by a Boltzmann-type distribution. Impressively, the relative sensitivity (Sr) of 3F2,3/1D2 states (I700nm/I362nm), 3F2,3/1G4 states (I700nm/I478nm), and 3F2,3/3H4 states (I700nm/I800nm) was obtained in this work as values of 1.30% K-1, 1.38% K-1, and 0.87% K-1, respectively. Compared with the conventional TCELs of 3F2,3/3H4, the two unconventional coupled levels of 3F2,3/1D2 and 3F2,3/1G4 present preferable properties as temperature probes enabling optical ratiometric thermometers. The research in this work provides an important advance in exploring other innovative FIR methods for optical thermometers to enable an intense and precise probing signal and detect temperature accurately.
关键词： fluorescence intensity ratio,Yb3+,oxyfluoride glass ceramics,Tm3+,Boltzmann-type distribution,optical thermometers
更新于2025-09-16 10:30:52
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Development of Eu3+ doped boro-tellurite oxyfluoride glass and their Judd-Ofelt analysis for red laser gain medium application
摘要： This paper investigated the physical, optical, luminescence and radiative properties of Eu3+ doped borotellurite oxyfluoride glass with composition (30-x)TeO2-30B2O3-10ZnF2-30BaO-xEu2O3 where x are 0.05, 0.10, 0.50, 1.00 and 1.50 mol%. The glass samples were fabricated by melt and quenching method. The physical and optical properties were investigated from density, molar volume and refractive index. Meanwhile absorption spectra that show several transitions in the ultraviolet to near infrared region interpret the optical properties of the glass sample. The emission spectra of glass sample were measured under excited ?ex = 394 nm. The highest peak of emission spectra occurs in 1.5 mol% of Eu2O3 due to 5D0→7F2 transition centered at 613 nm. The emission intensity was increased by the addition of Eu2O3 from 0.05 mol% to 1.5 mol%. In addition, Judd-Ofelt (JO) theory was used to define the radiative properties and lasing potential of the glass sample. The value of JO parameter ?2, ?4, ?6 was calculated and compared with literatures. Other radiative properties including experimental (fexp) and calculated (fcal) oscillator strengths, stimulated emission cross-sections (σ), radiative transition probability (AR), experimental and calculated branching ratios (?R) of glass sample were determined and discussed in term of red laser gain medium application.
关键词： Oxyfluoride glass,Europium,Gain medium
更新于2025-09-16 10:30:52
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Luminescent properties of Dy3+/Eu3+ doped fluorescent glass for white LED based on oxyfluoride matrix
摘要： Rare earth ion-doped fluorescent glass has become a hotspot due to its characteristics. This work shows that the prepared Dy3+ and Dy3+/Eu3+ doped glasses have white light emission under ultraviolet excitation. There is a higher yellow light/blue light (Y/B) value, indicating an increase in the covalentity of Dy-O, and decrease in the symmetry with the increasing concentration of dopants (Dy3+). The correlated color temperature (CCT) can be effectively reduced by the red light emission of Eu3+, and the order of influence of excitation wavelength on CCT is 395 nm > 382 nm > 365 nm .The delay curve demonstrates that the energy transfer from Dy3+ to Eu3+. The glass has the characteristics of anti-blue light damage and wide tunable color temperature, which illustrates that it has potential application in the field of white LED.
关键词： correlation color temperature,rare earths,oxyfluoride glass,Y/B intensity ratio,energy transfer
更新于2025-09-16 10:30:52
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AIP Conference Proceedings [AIP Publishing PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019 - Kerala, India (12–14 June 2019)] PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019 - Structural and optical studies of bismuth silicate oxyfluoride glasses for LED applications
摘要： The samples SBS20, SBS25 and SBS30 are prepared by traditional melt quenching method. The XRD pattern of prepared samples confirms the glassy nature and a broad peak at 2θ=280. The Raman spectra indicate that addition of SrF2 into the glass matrix leads to loosening of network. It will create more non- bridging oxygen in the samples. The Absorption spectra shows two peaks at 466 nm and 499 nm due to Bi2+ in different environments. The absorption edge shifted to lower wavelength with lower content of Bi2O3 due to the less amount of Bi3+ ion in the glass matrix. Optical band gap increases from 2.84eV to 2.86eV with increasing the SrF2 content leads to loosening of network. Emission spectra consist of three peaks at 435 nm, 510 nm and 630 nm, blue region is arising from Bi3+ and other two are from Bi2+. 20SBS and 25SBS show white light whereas 30SBS shows yellowish green in CIE diagram. The color purity and correlated color temperature are also calculated.
关键词： optical studies,structural studies,LED applications,bismuth silicate oxyfluoride glasses
更新于2025-09-12 10:27:22
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A Mn4+-doped oxyfluoride phosphor with remarkable negative thermal quenching and high color stability for warm WLEDs
摘要： Red-emitting phosphors composed of Mn4+-activated fluorides have attracted considerable interest for their applications in warm white light-emitting diodes (WLEDs). However, in addition to moisture instability, the unsatisfactory thermal stability of these phosphors limits their industrial applications. In this study, a novel red phosphor of CsMoO2F3:Mn4+ was synthesized via simple coprecipitation. This red phosphor exhibits an orthorhombic structure with a bandgap of ~3.43 eV. The Mn4+ ions occupy Mo6+ sites at the centers of [MoO2F4]2- octahedrons. This phosphor shows narrow emission around ～633 nm excited by 450 nm blue-chip with high color purity of 99.58%. Satisfactorily, this phosphor exhibits excellent thermal stability and a strong negative-thermal-quenching. The total PL intensity of CsMoO2F3:3.88%Mn4+ phosphor at 275 K strengthens to ~540% relative to that at 25 K, and its relative emission intensity preserves about 129.3% when the temperature rises from room temperature to 423 K (150 ℃). It also shows admirable color stability with a slight chromaticity shift (ΔE) of only ~33.9 × 10?3 in the temperature region from 298 to 473 K. Furthermore, a warm WLED was fabricated by the mixture of red-emitting CsMoO2F3:3.88%Mn4+ and the yellow-emitting YAG:Ce3+ phosphors with a blue-emitting InGaN LED chip. The device exhibits low correlated color temperature (3983 K) and high color-rendering index (Ra = 81.3). With the increasing drive current from 20 mA to 120 mA, the chromaticity coordinate variation (CCV) is only (-0.0163, 0.0202). All these results indicate that the CsMoO2F3:Mn4+ phosphor holds tremendous potential for practical applications in high-power lighting and display with high-performance WLEDs.
关键词： oxyfluoride,red phosphor,luminescence,negative thermal quenching,Mn4+
更新于2025-09-11 14:15:04