Luminescence Of Glasses Research Articles

Molecular Dynamics & FDTD Methods Synergistic Modulation for Surface Emission in Luminescent Glass by Metal Nanoparticles

Molecular Dynamics & FDTD Methods Synergistic Modulation for Surface Emission in Luminescent Glass by Metal Nanoparticles

Fast Preparation of White Luminescent Borosilicate Glass via Microwave Heating Technique

Fast Preparation of White Luminescent Borosilicate Glass via Microwave Heating Technique

The Effect of Na2O/B2O3 Composition Ratio on the Structure and Properties of Cu+ Doped Luminescent Glass

The Effect of Na2O/B2O3 Composition Ratio on the Structure and Properties of Cu+ Doped Luminescent Glass

Luminescent phosphor glasses with Sm2O3 for photodynamic therapy application

Photodynamic therapy is a modern and non-invasive therapy used for the treatment of non-cancerous diseases as well as cancers of various types. Because of good therapeutic results and the possibility of parallel application of photodynamic therapy (PDT) with other therapeutic protocols, this treatment is widely used in many fields of medicine and biomedical applications. This paper is devoted to the preparation of new luminescent phosphate glasses, suitable for the application in photodynamic therapy. Phosphor glasses with different composition were prepared in this study. Transmittance spectra, excitation spectra and luminescence of the prepared samples were measured. Furthermore, the photosensitivity of rhodamine b to light generated by the prepared N4 glass was described. By measuring all samples, it was found that the most optimal from all prepared glasses is sample N4. This sample, containing oxides in molar percentages, is well-suited for use in photodynamic therapy applications: Na2O – 12.75 %; CaO – 2.31 %; ZnO – 34.20 %; SiO2 – 40.08 %; P2O5 – 9.11 %; Sm2O3 – 1.55 %.

Metal Nanowire‐Induced Enhancement of Surface Emission in Luminescent Glass

AbstractLuminescent glass, as an important component of photonic materials, is extensively utilized in applications such as lasers and optical fiber amplifiers, which demand high quantum efficiency. To further enhance the surface emission performance of luminescent glass, this study introduces a novel approach by employing custom‐made metal nanowires, applying them as coatings on the surface of Erbium‐doped glass, rather than embedding traditional metal nanoparticles. Utilizing experimental techniques and Finite‐Difference Time‐Domain (FDTD) simulations, it is demonstrated that the surface‐emission from Erbium‐doped glass coated with silver nanowires or copper nanowire‐graphene hybrids is significantly increased, showing an enhancement rate of up to 117.27% compared to intrinsic glass. Extended FDTD analysis reveals that variations in the size and density of the nanowires can optimize emission characteristics, thereby improving the emission performance of luminescent glass. The enhancement of the local electromagnetic field at the interface underscores the efficacy of metal nanowires in boosting photonic materials. This study not only highlights the practicality of metal nanowires in photonics but also introduces a rapid deployment pathway for customizing photonic interactions through nano‐engineering, potentially extendable to other photonic materials.

Feasebility of using waste hydrated cement paste and luminescent glass as aggregates for the production of mortar

This study examines feasibility of incorporating waste hydrated cement paste (WHCP) and luminescent glass (LG) as sand replacements in conventional mortars. Luminescent glass aggregates (LG) were produced by initially mixing luminescent powder with adhesive resin and subsequently adding glass pellets with size smaller than 2 cm. WHCP was produced by mixing cement and water and then cured at room temperature prior to be ground into aggregate with size smaller than 2 mm. Luminescent composite mortars (WLM) were produced by replacing 50–70% of sand by WHCP and LG in which LG replaced 40% of the sand content while WHCP replaced the remaining 10–30%. The feasibility of WLM samples were assessed by their physical and luminescent properties. As results, WLM samples met requirements for constructive mortar such as flowability, drying skrinkage and porosity. At 28d, all WLM samples achieved a strength of around 45 MPa at 28 days, satisfying the strength requirements for constructive mortar. Regarding luminescence properties, all WLM samples exhibited luminescent intensity higher than the threshold of human eyes up to 8h. Luminescent decay curves followed the trend observed in luminescent powders. As such, WLM can be utilized in building projects, particularly for the auxiliary tasks related to road and bridge structures.

Synthesis and properties research of Dy3+-Eu3+ co-doped BBiBaZ luminescent glass for white LED applications

A series of BBiBaZ luminescent glasses with different concentrations of Dy3+ doping and Dy3+-Eu3+ co-doping was planned by the high-temperature melt method. Their structure, chemical stability, glowing properties, energy transfer, and temperature-dependent emission spectra were also investigated. Under various monitor wavelengths, the visible emitted spectrum of the Dy3+-Eu3+ co-doping luminescent glass was obtained. The presence of Dy3+→Eu3+ energy transfer in the glass was demonstrated by emission spectra and fluorescence decay curve analyses. At the excitation of 384 nm, better white color emitting was noticed in BBiBaZ glass doped with Dy2O3 doping concentration of 0.75 mol% and doped with 0.4 mol% Eu2O3 with a CIE of (0.3306, 0.342), and the glass has an ΔE of 0.221 eV, which suggests that the synthesis glass has the prospective to be applied in white light solid-state lighting. In addition, the Dy3+-Eu3+ co-doped BBiBaZ glass could achieve tunable emission moving from cooling white to heating white to an orange-red light under 390 nm excitation. The adjustable range of the glass’s CCT values has been expanded, allowing for arbitrary tuning between approximately 2004–6380 K, which adapts to different application fields.

Enhancing the luminescent properties of strontium phosphate glass via controlled crystallization and rare earth dopants

The study focused on investigating the photoluminescence behavior of pure strontium phosphate glasses with a composition of 62.5% P2O5 and 37.5% SrO. Then it was extended to investigate the effects of adding rare earth elements (Pr3+, Sm3+, Eu3+, Dy3+) and the crystallization process on improving luminescent properties of the parent glass. Various spectroscopic measurements, including XRD, SEM & EDAX, and FTIR, were conducted to examine the relationship between structural changes and their impact on luminescent performance. The optical measurements showed a characteristic enhancement resulting from the addition of RE3+-dopants and the crystallization process. The crystallization of glasses yielded a single phase from Sr(PO3)2 with an extended emission peak at 671 nm and heightened intensity compared to the glassy sample. The development of efficient and stable luminescent glasses via crystallization and dopant type can lead to advancements in applications such as glowing devices, optical detectors, and photonics innovations.

Broadband Near-Infrared Emission from Bi/Cr Co-Doped Aluminosilicate Glasses.

Bismuth-doped aluminosilicate glass has garnered significant attention due to its unique ultra-wide luminescence properties in the near-infrared (NIR) band. Enhancing the NIR luminescence of Bi-doped glass remains challenging. To achieve Bi-doped glass with more excellent luminescent properties, a series of Bi/Cr co-doped glasses were prepared, and the optical and structural properties of the samples were observed. The results indicate that low-concentration Cr doping broadens the luminescence range of Bi/Cr co-doped glass samples. The luminescence peak of Bi in the samples is at 1230 nm, while the peak of Cr is around 804 nm. The addition of an appropriate amount of Bi2O3 can enhance the NIR luminescence of Bi and Cr in the sample, realizing the energy conversion between Bi and Cr. Bi/Cr co-doped is a novel approach for achieving broadband NIR luminescence in glass materials.

High-Stability Near-Infrared Luminescent Glass Ceramic and Its Applications.

Near-infrared (NIR) light, valuable for its biological penetration and invisibility to the human eye, is a crucial tool in biomedicine, environmental monitoring, anticounterfeiting, and information encryption, yet traditional NIR luminescent materials are often unstable in humid conditions. Here, a highly stable MgGeO3:Mn2+ glass ceramic (GC) with NIR luminescence was successfully synthesized. As-obtained GC700 boasts exceptional luminescent capabilities and possesses abundant trap structures, enabling data inscription with a 405 nm laser and retrieval via laser/thermal excitation. Moreover, the emission peak of Mn2+ can be manipulated from 630 to 691 nm by increasing the annealing treatment temperature. With the harnessing of the effective NIR emission, stable carrier characteristics, and numerous trap structures, there is potential for application in information encryption. Accordingly, we explored the application of MgGeO3:Mn2+ GC (GC700 and GC800) samples in precious three-dimensional (3D) information storage and NIR mechanoluminescence (ML) for biological tissue imaging. These applications demonstrate the potential and versatility of electron-capturing NIR luminescent materials in a range of cutting-edge fields.

Spectral selectivity of luminescence of a copper ion-exchange layer in sodium-potassium-magnesium silicate glass

The bright luminescence of the copper ion-exchange layer in glass has potential applications as a converter of electric spark and corona discharge radiation in devices for the rapid analysis of metals because of its selectivity. The selectivity of the luminescence of the copper ion-exchange layer was achieved by the presence of different luminescent centers within it. In this work, the copper monomers, Cu+-Cu+ monovalent dimers, and Cun molecular clusters were formed in an ion-exchange layer of sodium-potassium-magnesium silicate glass (SiO2-Na2O-CaO-MgO-Al2O3-K2O-Fe2O3). The luminescence of the copper ion exchange layer was characterized by steady-state spectroscopy and time-resolved spectroscopy. Molecular copper clusters Cun exhibited luminescence in the nanosecond range, and Cu+ monomers and Cu+-Cu+ monovalent dimers in the microsecond range, respectively. At the same time the formation of divalent copper led to a limitation in the duration of ion exchange for the production of luminescent glasses. Heat treatment of the ion-exchange layers led to an increase in the concentration of molecular copper clusters, Cu+-Cu+ monovalent dimers, and Cu2+ divalent monomers.

Efficient Reversible Upconversion Luminescence Modulation based on Photochromism of Lanthanides‐Doped BaMgSiO4 Glass Ceramics Toward Optical Storage Application

AbstractTransparent glass with photochromic and luminescent properties has recently garnered considerable interest in optical storage, while the photochromic transparent glass system is still limited. Herein, it is proposed that combining transparent glass matrix with photochromic nanocrystals is an efficient strategy to develop a broader range of photochromic luminescent glass systems. The Yb3+/Tb3+ co‐doped BaMgSiO4 glass ceramics are successfully prepared by a two‐step melt‐quenching approach followed by a thermal treatment in a reducing atmosphere. The glass ceramics exhibit high transparency and distinct coloration, showing a color change between colorless and pink by alternating irradiation between 365 nm ultraviolet light and 473 nm laser. The formation of color centers in the BaMgSiO4 nanoparticles drives the coloration of such glass ceramics. Based on their photochromic and photobleaching behavior, the efficient reversible upconversion luminescence modulation can be implemented with the maximum luminescence modulation rate of 79.83%. The excellent reproducibility and anti‐fatigue of such upconversion luminescence modulation demonstrate the promising application of Yb3+/Tb3+ co‐doped BaMgSiO4 glass ceramics as an optical storage medium.

The dual role of Dy3+ in a novel Sr2Al2SiO7:Eu2+, Dy3+ long-persistent luminescence glass–ceramic

A novel Sr2Al2SiO7:Eu[Formula: see text], Dy[Formula: see text] long-persistent luminescence (LPL) glass–ceramic has been successfully synthesized by the recrystallization-melting method in the SrO-Al2O3-SiO2-B2O3-Li2O glass system. The glass–ceramic form enhances the plasticity of the material compared to traditional Sr2Al2SiO7:Eu[Formula: see text], Dy[Formula: see text] phosphorescence powders. Additionally, the Dy[Formula: see text] ions serve a dual role as fluorescence emission centers and sensitizers for afterglow. By controlling the concentration of Dy[Formula: see text], the characteristic fluorescence intensity can be adjusted to achieve color-tunable photoluminescence. Besides, Dy[Formula: see text] ions, as trap centers, capture the electrons, resulting in a longer afterglow than the Eu[Formula: see text] singly doped sample. After exposure to ultraviolet light, the initial brightness intensity of the Dy:Eu = 16:1 sample increases to 1525 mcd/m2, and the emission lasts for 30 min. These optimized bulk materials, with unique luminous properties, have potential applications in future optoelectronic devices.

Enhancing the efficiency of photovoltaic cells through the usage of dye concentrators

Over the past few years, there has been a growing interest in renewable energy sources. Among them, photovoltaic (PV) technology is advancing rapidly. Solar insolation is the most crucial factor for PV installations. Various solutions, such as tracking mechanisms, hybrid systems, and new materials, can enhance the efficiency of PV systems. Concentrators focus solar light onto the surface of solar modules, increasing production of electricity. Implementing such solutions can reduce the number of silicon cells in installations, leading to a decrease in waste generated during production. Dye concentrators have a positive impact on the performance of silicon systems. A two-stage study on the effect of dye concentrator application on PV cell efficiency is carried out. In the first stage, specific types of dye concentrators are tested for their interaction with the silicon system. Tinted and luminescent acrylic glass (polymethyl methacrylate, PMMA) in yellow and red are used as dye concentrators. The experiment included multiple measurement calibrations, such as the temperature of the tested silicon cell and the intensity of illuminance. Results showed absolute increase of efficiency in solar cells ranging from 0.05% to 1.42%, depending on the type of concentrator used. The most significant improvements were observed with luminescent red PMMA, averaging at 1.21%. The potential of this concentrator was further explored in the second stage of the study, investigating the relationship between the surface involvement of the silicon cell and the dye concentrator. Test results indicated the potential of dye concentrators for integrating luminescent dye concentrator technology into PV systems. The effect of this integration is increase in the efficiency of the PV cell. On the other hand, it should be noted that replacing the PV cell with a dye concentrator reduces the efficiency of the entire photovoltaic system. Hence, the use of a PV cell and concentrator system is recommended especially for photovoltaic systems with a large area. As dye concentrators have the ability to operate without direct irradiance, they are also recommended for regions where natural light is dispersed.

Modern trends in the creation of luminescent silicate ceramic and glass materials for industry and technology

Modern trends in the creation of luminescent silicate ceramic and glass materials for industry and technology

Photo and X˗ray induced luminescences of Eu3+˗doped sodium alumino boro˗tellurite oxyfluoride scintillating glass for X˗ray detecting material

The spectroscopy features of sodium alumino boro˗tellurite oxyfluoride glasses doped with various molar fractions of Eu2O3 ions (TBANEu) are studied through absorbance, excitation, emission, and decay curves. The excitation data are used following phonon side band spectroscopy to evaluate the phonon energy (1326 cm-1) of the glass host. The densities, molar volumes, and refractive indices, including the Ω2,4,6 parameters of fabricated glasses are studied. The magnitudes of laser properties like effective line widths, branching ratios, and emission cross˗sections obtained for the Eu3+:5D0→7F2 transition could be useful for reddish-orange lighting devices application. Additionally the quantum efficiency estimated from experimental and calculated lifetimes is about ˃ 70% for the 5D0 level luminescence of TBANEu glasses. Upon 395 nm radiation, the current glass system can exhibit color coordinates close to (0.647, 0.351) for reddish˗orange light as performed by the CIE1931 chromaticity diagram. The integral scintillation intensities of TBANEu glasses were determined using the X˗ray excitation and observed that the TBANEu20 glass showed a highest scintillation efficiency of 39%, resulting in scintillator and X˗ray sensing device applications.

Structure, luminescence properties, and energy transfer of Dy3+/Sm3+ co-doped BCAZM glasses for white LED applications

B2O3–CaO–Al2O3–ZnO–MoO3 luminescent glasses doped with Dy3+, Sm3+, and Dy3+/Sm3+ were prepared by melt-quenching method. Structure, luminescence properties, energy transfer and thermal stability of the glasses were analysed. As deduced from the increase in density, [BO4] unit proportion and Dy3+ luminescence yellow/blue ratio and the decrease in band gap value, the increase in the doping concentration of Sm2O3 promotes the formation of non-bridging oxygen and enhances the structural asymmetry. Meanwhile, the change in Dy3+ emission intensity and the decrease in fluorescence lifetime indicate the presence of an energy transfer from Dy3+ to Sm3+, and the Inokuti-Hirayama model fit suggests that the energy transfer may occur within the Dy3+-Sm3+ cluster. In addition, the CIE chromaticity coordinates and correlated colour temperature of the Dy3+/Sm3+ co-doped B2O3–CaO–Al2O3–ZnO–MoO3 glass fall within the white light region and have good thermal stability, which is potentially promising for application in W-LED lighting.

High-efficiency luminescent Eu3+ heavily doped glass prepared from black talc: A promising material for significant applications in W-LED illumination

As a distinguished luminescent matrix, rare earth (RE)-doped glass has garnered considerable attention across lighting, display, laser, and related domains. Nonetheless, the limited luminescent efficiency of such glass imposes constraints on its extensive utilization. In addressing this challenge, we have developed a novel formulation involving heavily Eu3+-doped black talc glass, boasting exceptional optical characteristics. Structural examination has validated the successful synthesis of the parent glass matrix comprising [SiO4] and [AlO4] units. With the escalating of Eu3+ doping concentrations, the glass manifested an upward trend in both density and refractive index. Under the excitation of 393 nm light, the glass exhibited strong red light emission, demonstrating a high internal quantum efficiency (IQE) of up to 84.67 %, surpassing markedly other Eu3+-doped glass variants. Furthermore, even under elevated temperatures reaching 150 °C, the glass retained 86.2 % of its luminescent intensity at room temperature, indicative of superior thermal resilience vis-à-vis alternative glass systems. As a proof-of-concept, we encapsulated a white light-emitting diode (W-LED) assembly employing a 395 nm LED chip, Eu3+-doped glass, BaMgAl10O17:Eu2+ blue phosphor, and Ba2SiO4:Eu2+ green phosphor. The resultant device exhibited favorable chromaticity coordinates (0.3566, 0.3994), boasting a correlated color temperature (CCT) of 4791K and a high color rendering index (CRI) of 91. In summary, this investigation employs black talc ore to synthesize luminescent glass, thereby not only diversifying the application scope of black talc but also augmenting its additional value, while notably enhancing the luminescent efficiency of the glass through heavy Eu3+ doping. Through empirical validation, the significant potential benefits of Eu3+-doped black talc glass in the realm of W-LED lighting were convincingly demonstrated.

Adjusting photoluminescence of high thermostability Dy3+/Eu3+ co-doped borosilicate glass for white LED device

Due to the adoption of fluorescent powder encapsulated by organic resin, commercial light emitting diodes (LEDs) suffer from low thermal stability and poor light quality under high temperature, and luminescent glass is one of the effective ways to solve this problem. A series of borosilicate (B2O3–SiO2–Al2O3–PbO-Dy2O3–Eu2O3, marked as BSAP: DyEu) was prepared by the gas suspension technique. The basic characterization test indicate that the prepared glass has excellent thermal stability and stable structure. The optical properties of the luminescent glass were investigated in detail. By changing the Eu3+ doping amount, the Dy3+/Eu3+ co-doped glass can realize warm white light emission. The temperature-variable fluorescence spectra of BASP: Dy1.25Eu1.0 were analyzed, and the glass can produce strong warm white light emission in a wide temperature range. At 700 K, the luminous intensity of the glass remains above 38.49 % of the room temperature, and the chroma shift ΔC = 8.57 × 10−3. In addition, the w-LED device based on commercial GaN chip and BSAP: DyEu glass realizes warm white light output with excellent correlated color temperature (3063 K) and high color rendering index (90.3). The analysis shows that Dy3+/Eu3+ co-doped borosilicate glass can be used as a candidate material for w-LED applications.

Prediction of mid-infrared 2.72 μm lasing in heavily Er3+-doped fluorotellurite glass

Fluorotellurite glasses heavily doped with Er3+ are prepared in less demanding conditions as compared with fluoride glasses. Specifically, the effects of PbF2 added in the system of AlF3–MgF2–CaF2–SrF2–BaF2–TeO2 (AMCSBYT) are systematically studied on the correlation between glass structure and mid-infrared (MIR) luminescent properties of Er3+. These PbF2-modified glasses with an improved thermal stability and a noticeably reduced phonon energy as compared with telluride glasses exhibit an intense MIR emission at 2.72 μm and a long radiative decay lifetime. Calculation and analysis based on the Judd-Ofelt theory provide deeper insights into the interdependence of luminescent properties and glass structure. Numerical simulation is conducted for a MIR fiber laser based on the experimental data derived from the proposed glass. The 2.72 μm lasing output of 0.68 W is predicted with a slope efficiency of 3.38 %. It is expected that the performance of the fiber laser can be further optimized such that the output power can be increased over 1.0 W. The results emphasize the potential of the PbF2-modified fluorotellurite glass as a promising gain material for 2.72 μm fiber lasers.