Lithium Tetraborate Glass Research Articles

The Impact of Silver Codoping on Tb3+ Luminescence in Lithium Tetraborate Glasses.

Spectroscopic properties of Tb-doped and Tb-Ag codoped lithium tetraborate (LTB) glasses with Li2B4O7 (or Li2O-2B2O3) composition are investigated and analysed using electron paramagnetic resonance (EPR), optical absorption, photoluminescence (PL) and photoluminescence excitation (PLE) spectra, PL decay kinetics and absolute quantum yield (QY) measurements. PL spectra of the investigated glasses show numerous narrow emission bands corresponding to the 5D4 → 7FJ (J = 6-0) and 5D3 → 7FJ (J = 5-3) transitions of Tb3+ (4f8) ions. The most intense PL band of Tb3+ ions at 541 nm (5D4 → 7F5 transition) is characterised by a lifetime slightly exceeding 2.6 ms. PL spectra of the Ag-containing glass show two broad weakly resolved emission bands in the violet-green spectral range attributed to Ag+ ions and nonplasmonic Ag nanoclusters. Decay kinetics of these bands are nonmonoexponential, characterised by an average lifetime in the microsecond range. A significant enhancement of the PL intensity and PL QY of Tb3+ ions was observed in Tb-Ag codoped LTB glass in comparison with Tb-doped LTB glass. The excitation energy transfer (EET) mechanisms from Ag+ ions and Ag nanoclusters to Tb3+ ions were explored.

Spectroscopic properties and luminescence of the lithium tetraborate glasses co-doped with manganese and europium

High quality Li2B4O7:Mn,Eu glasses containing 1.0 mol.% MnO2 and Eu2O3 were prepared and investigated by XRD, EPR and optical spectroscopy techniques. Obtained data analysis shows that Mn is incorporated into the glass network as Mn2+ and Mn3+. Parameters of observed Mn2+ EPR signals in the Li2B4O7:Mn,Eu glasses were determined. Optical absorption spectrum of the studied glasses consists of broad band at 464 nm corresponding to the 5Eg(D) → 5T2g(D) transition of Mn3+ (3d4) ions and few narrow weak bands of the Eu3+ (4f6) ions. Emission spectra of the Li2B4O7:Mn,Eu glasses in orange-red region exhibit several sharp bands corresponding to the 5D0 → 7FJ (J = 0–4) transitions of Eu3+ ions and broad band belonging to the 4T1g(G) → 6A1g(S) transition of Mn2+ (3d5) ions. Comparative discussions were made on the luminescence spectra and decay curves of Mn2+ and Eu3+ ions in the Li2B4O7:Mn,Eu glasses and those in Mn-doped and Eu-doped glasses with the Li2B4O7 basic composition.

Influence of Ag co-activation on the Dy3+ luminescence in lithium tetraborate glasses

In this work we study and analyse the optical-luminescence properties of the lithium tetraborate (Li2B4O7 or Li2O–2B2O3) glasses activated with dysprosium (Dy) and co-activated with Dy and silver (Ag). Our analysis reveals the presence of Dy3+ (4f9) and Ag+ (4d10) ions as well as non-plasmonic Ag nanoclusters in the lithium tetraborate glass network. In the luminescence emission spectra were detected two strong and narrow blue and yellow bands attributed to Dy3+ ions as well as two broad unresolved bands covering violet-green spectral range, which correspond to Ag+ ions and Ag nanoclusters. An increase in the luminescence intensity of Dy3+ and an increase in the corresponding quantum yield as a result of Ag co-activation were obtained. Mechanisms underlying the energy transfer processes from Ag+ ions and Ag nanoclusters to Dy3+ ions have been discussed. Our results contribute to the development of the glassy luminescent materials for the white spectral range.

ESR and optical investigation of tetragonal PbTiO3 nanoparticles embedded in lithium tetraborate glass matrix

Glass-nanocomposites (GNCs) samples of composition [(100−x) Li2B4O7–xPbTiO3] with x = 5, 10, 15 and 20 mol% were prepared by melt quenching method. The two phases of the GNCs samples, a glassy phase and PbTiO3 nanoparticles/clusters phase, can be seen in the energy dispersive X-ray spectra and scanning electron microscopic micrographs. Fourier transformation infrared spectra of the GNCs samples exhibited bands due to triangular with NBO’s and tetrahedral borate groups. Additionally, the Ti4+ ions exist in both TiO4 and TiO6 structural units while the Ti3+ ions exist in TiO6 structural units. The electron spin resonance (ESR) spectra of the GNCs samples exhibit two ESR signals, broad and narrow, corresponding to the Ti3+ (3d1) ions in both tetragonal deformed octahedral and in the other structural configuration, respectively. The optical transmission spectra of the GNCs samples exhibited three transmission bands, 3Γ5 → 2Γ3, 2B2g → 2B1g and 2B2g → 2A1g transitions, in the visible region. The variation in optical band gap (Eopt) with increasing PbTiO3 content were due to the conversion between BO3 with NBOs and BO4 units as well as the reduction of Ti4+ to Ti3+ ions in the GNCs matrix. These results demonstrate that the present GNCs may be used for practical applications such as optical devices.

Luminescence properties of Eu3+ ions in glassy lithum tetraborate matrix

Relevance. Luminescent properties of materials doped with rare-earth ions have garnered significant interest due to their applications in various fields, including optoelectronics and photonics. Glassy lithium tetraborate (LTB) represents a promising matrix for hosting such ions, offering tunable luminescence properties.Purpose. The purpose of this study was to investigate the concentration dependence of the luminescence spectrum of glassy LTB doped with europium oxide within the spectral range of 300-750 nm.Methodology. Glassy samples of LTB activated by europium oxide were synthesized via a high-temperature process and characterized using photoluminescence (PL) spectroscopy. The PL spectra were recorded in the specified spectral range under excitation by a titanium-sapphire laser. The experimental setup provided insights into the luminescence behavior of the samples at different Eu3+ ion concentrations.Results. The concentration dependence of the photoluminescence spectra of glassy lithium tetraborate Li2B4O7 activated by europium oxide Eu2O3 was investigated in the spectral range of 300-750 nm. The intense emission observed in the wavelength region of 570-720 nm is attributed to the intra-configurational electronic f�f transitions between the excited multiplet levels 5D and the ground multiplet 7F of the Eu3+ ion.Conclusions. The observed transitions, forbidden by selection rules, indicated J-mixing effects. The study highlights the potential of Eu-activated LTB glass for optoelectronic applications and provides insights into the underlying luminescence mechanisms.

Structural and spectroscopic studies of lithium tetraborate glass co-doped with Sm and Cu.

The local structure and spectroscopic properties of Cu-Sm co-doped Li2B4O7 glass have been studied using XRD, EPR, UV-Vis-NIR absorption and luminescence methods and compared with the corresponding results for Sm-doped and Cu-doped Li2B4O7 glasses. The EPR spectrum reveals an axially-symmetric signal with a characteristic hyperfine structure belonging to Cu2+ ions. The Cu2+/Cutotal ratio was determined. The optical absorption spectrum shows a broad, intense band attributed to Cu2+ ions and several weaker narrow bands attributed to Sm3+ ions. Photoluminescence (PL) and photoluminescence excitation (PLE) spectra as well as PL decay kinetics of Sm3+ and Cu+ ions were registered, analyzed, and discussed. The PL spectra show a broad band assigned to the 3d94s1 → 3d10 transition of Cu+ ions and four narrow bands assigned to the 4G5/2 → 6HJ (J = 5/2-11/2) transitions of Sm3+ ions. The observed changes in PL intensity, shortening of the Sm3+ lifetime and prolongation of the Cu+ lifetime were explained by energy transfer from Sm3+ → Cu+ and re-absorption of the Sm3+ emission by Cu2+ ions.

Impact of modifiers on structural and optical properties of Dy3+doped different lithium tetraborate glasses for W-LED applications

The melt quenching technique achieved the synthesis of multiple samples of glasses were prepared, each containing Dy3+ ions as dopants and containing alkali and alkaline earth metals. Subsequently, several physical properties of these samples were assessed. The current investigation covers the characterization of Dy3+ doped lithium tetraborate glasses with varying compositions using powder X-Ray Diffraction (PXRD), FTIR, FT-Raman spectroscopy, optical absorption, and photoluminescence spectroscopy. The X-ray powder diffraction (PXRD) analysis indicates that the glass specimens exhibit an amorphous structure. The elemental composition of these materials has been determined using EDS. The utilization of FTIR and FT-RAMAN spectra is employed for the purpose of identifying distinct structural groups. J-O theory is employed to obtain J-O Intensity parameters and radiative parameters based on the absorption spectra. The photoluminescence spectra were utilized to determine the experimental branching ratios (βexp), effective bandwidths (Δʋeff), and stimulated emission cross-sections (σP) for all of the glass matrices that were prepared. The bi-exponential decay profiles of the 4F9/2 state were obtained and analyzed for all glass specimens containing Dy3+ ions. The lifetimes (τ) and quantum efficiencies (η) were determined by measuring decay profiles. Emission spectra are used to calculate correlated color temperatures (CCTs), CIE chromaticity coordinates and yellow-to-blue intensity ratios (Y/B).

Study on influence of modifiers on structural and spectroscopic properties of Nd3+ doped different lithium tetra borate glasses

Different multi-component (Li, Na, Ca, Ba, LiNa, BaCa) borate glasses doped with 1 mol% of Nd3+ ions were prepared by the melt-quenching method. The structural information was carried out by PXRD, FTIR and 11B MAS-NMR characterizations. Based on Thermogravimetry (TG) and Differential Scanning Calorimetry (DSC), thermal stability has been taken care for the glass samples which are mentioned at present work. From PXRD, it is clearly observed that the prepared glass samples are amorphous in nature. The FTIR spectra were examined to determine if the borate glasses contained BO3 or BO4 functional groups.11B MAS NMR gives structural presentation of BO3 and BO4 groups and boron-oxygen coordination number. The evaluation of Judd-Ofelt parameters, Ω λ (λ = 2, 4, 6), and spectroscopic quality factors (χ) were conducted based on the optical absorption spectra and spectral intensities. The present study involves an analysis of the transition probabilities (A) and branching ratios (β) of specific transitions of Nd3+ ion doped in various glasses, utilizing the Judd-Ofelt intensity parameters. The emission spectra of the glass samples were recorded with 808 nm excitation, it shows three peaks at 881, 1050 and 1332 nm. Theoretical analysis was conducted on the luminescence properties of borate glasses, and various radiative properties were also investigated. From the luminescent properties of Nd3+ doped different lithium tetraborate glasses, it is concluded that LiBiNaTNd and LiBiBaCaTNd glasses are promising gain materials for 1.05 μm fiber laser applications.

Fabrication of glass-ceramics composite by infiltration of lithium tetraborate glass into porous magnesium aluminate spinel ceramic

Magnesium aluminate spinel (MAS) glass-ceramics composite has excellent mechanical and optical properties. It can be obtained from porous ceramic by infiltrating the proper choice of glass. In this study, porous MAS ceramic was prepared by conventional sintering from MAS powder to reach a bulk density of 2.48 g∙cm-3 (70.1% of relative density). The porous MAS ceramic was then infiltrated with molten lithium tetraborate glass (Li2B4O7; LTB) at 950℃ for 30 (IF30) and 60 (IF60) min. They were left to cool down to 700℃ inside the furnace before being taken out to quench in ambient. The glass-ceramics composite was obtained with 98.7% and 92.1% relative density for IF30 and IF60 cases, respectively. SEM images reveal a lower degree of porosity in the IF30 case, which achieves higher flexural strength of 119.7 MPa. X-ray diffraction and Raman spectroscopy indicate that Mg2B2O5 phase (at 2q =35°) and B2O5 functional group (at 847 cm-1) are formed during infiltration. Consequently, their micro vickers hardness increased (3.41®5.53®6.16 GPa).

Towards guided metallic ions migration in network glass-formers: The Positronics approach in application to lithium tetraborate glass

The Positronics approach grounded on positron annihilation lifetime spectroscopy treated in terms of x3-x2-CDA (coupling decomposition algorithm) is used to recognize nanostructurization-driven volumetric effects in lithium tetraborate glass g-Li2B4O7 under transition to crystalline state, doping by Ag and/or Gd activators and 2-h above-Tg annealing in air environment. Lithium vacancies and vacancy complexes are shown to be principal free-volume elements responsible for positron trapping and decaying of bound positron-electron (positronium, Ps) states in these glasses. Expected devitrification (glass-to-crystal) transition corresponds to direct (Ps-to-positron) trapping conversion in volume-contracted network due to transformation of Ps-hosting sites in positron traps.Plausible migration scenarios for metallic activators in g-Li2B4O7 include occupation of vacancy-type positron traps and Ps-decay holes by Ag+ and/or Gd3+ ions, totally reducing positron-trapping and Ps-decaying contributions. Effect of thermal annealing in metal-doped lithium tetraborate glass is not related to simple de-occupation of vacancy-type defects due to escape of Ag + or Gd3+ ions. Annealing-stimulated transformations are guided by relaxation towards defect-free glass structure, being disturbed by competitive defect formation and destruction processes accelerated by interaction with oxygen. Since non-elementary nature of trapping-modification processes in doped glasses subjected to annealing, the formalism of x3-x2-CDA cannot be reasonably applicable.

The effect of replacing copper metal or oxide with neodymium on the optical properties of lithium tetraborate glass

The melting quenching technique is used to create lithium tetraborate glasses with the following composition (in mol %): 80 Li2B4O7-(20-x) Nd2O3-x Cu metal or x CuO mol% (x = 0, 5, 10, 15, and 20). X-ray diffraction (XRD), optical absorption, photoluminescence, thermal analysis, and Fourier transmission infrared (FTIR) were studied. The optical absorption spectra indicate the presence of Nd3+ and Cu2+ ions. The absorption spectra determine the Judd–Ofelt intensity parameters (Ωλ), the oscillator strengths, and bonding parameters. The high value of Ω2 indicates the increasing covalent bonding within the host structure. The ratio between emission intensities and excitation indicates that glass samples are used as laser sources. The photoluminescence spectra revealed neodymium ion emission. The glasses containing 20 mol % Nd2O3 (free from copper) emitted light at 1053 nm. The strength of emission peaks decreases as copper concentration increases according to the quenching effect. The findings indicate that the samples investigated are suitable for use in solid-state lasers.

Mn, Cu and Cr nanoparticles in Li2B4O7 glass: Radiation shielding and optical properties

Lithium tetraborate (Li2B4O7) glass matrices doped with Manganese (Mn), Copper (Cu) and Chromium (Cr) were synthesized, using the melt-quenching method. Radiation shielding and optical parameters are studied in this work. High-resolution Transmission Electron Microscopy confirms formation of Mn, Cu and Cr nanoparticles in the samples. Absorption spectra of the samples show the characteristic surface-plasmon bands of these transition-metals nanoparticles. Their bandgaps were calculated from the absorption spectra. The fluorescence bands of each transition-metal nanoparticle ensembles in the tetraborate glass matrices are identified by recording the fluorescence spectrum. Emission spectra under 405 nm pumping show bands with a peak at 591 nm from nanoparticles of Mn, a peak at 750 nm of Cu, and a peak at 735 nm of Cr. The fluorescence lifetimes are measured, and the stimulated emission and absorption cross-section are calculated. The theoretical values of radiation shielding parameters mass attenuation coefficient (MAC), half value layer (HVL), tenth value layer (TVL), mean free path (MFP) and effective atomic number (Zeff) were calculated for the glass samples to analyze which sample has the best radiation shielding response. It should be noted that the samples made in this work present a better response than high-performance heavyweight concrete mixes using the coarse aggregates of magnetite.

Passive dosimetry of β-irradiated lithium borate doped glass

This study investigates the role of doping lithium tetraborate glass (Li2B4O7) with Mg and Tb on the TL dosimetric properties of the glass samples. Glass samples doped with both Mg and Tb were prepared using a melting method at 1000 °C. Beta particles were used as a source of ionizing radiation. The optimum combination of doping Mg and Tb to the glass samples was determined by doping Mg first and then adding Tb to the best concentration of Mg. The crystal structure of the virgin glass samples, the samples doped with Mg, and the samples doped with Mg and Tb were probed using XRD. The TL glow curve of the glass samples doped with the optimum combination of Mg and Tb was recorded and analyzed using different methods. To estimate the number of TL components in the glow curves, Tm–Tstop method was used. Kinetic parameters of the glow peaks were determined using CGCD and peak shape methods. TL dosimetric properties of the samples doped with the optimum combination of Mg and Tb, such as dose-response linearity, sensitivity, reproducibility, minimum detectible dose, and thermal fading were also characterized.

Effect of silver co-doping on luminescence of the Pr3+-doped lithium tetraborate glass

Spectroscopic and luminescent properties of the Pr-doped and Pr–Ag co-doped borate glasses with Li2B4O7 (Li2O–2B2O3) composition are studied and discussed. Experimental and theoretical oscillator strengths (fexp and ftheor), phenomenological parameters (Ω2, Ω4, Ω6), radiative properties (Arad, β, τrad), and quantum efficiencies (η) of the Pr3+ luminescence were calculated basing on the obtained experimental results and Judd–Ofelt theory. Most intense band of the Pr3+ luminescence is peaked at 601 nm (1D2 → 3H4 transition). Presence of the isolated Ag+ (4d10, 1S0) ions, small non-plasmonic Ag aggregates (Agmn+ nanoclusters), and plasmonic Ag metallic nanoparticles in the Li2B4O7:Pr,Ag glass was proposed basing on analysis of the photoluminescence and optical absorption spectra. Observed enhancement of luminescence intensity and increasing of stimulated emission cross-section and quantum efficiency of luminescence in the Li2B4O7:Pr,Ag glass is explained by energy transfer from Ag species to the Pr3+ ions as wells local-field effect induced by Ag nanoparticles.

Optical and Mössbauer spectroscopy of lithium tetraborate glass doped with iron oxide

The glass system with composition [80Li 2 B4O 7 +(20-x) ZnO + xFe 2 O 3 ] where x = (0, 2, 4, 6, 8 mol. %), was prepared by traditional melt quenching method. The impact of iron ions on the structural and optical properties of the investigated samples was studied by a set of commentary techniques including density, infrared, optical absorption, electron spin resonance (ESR) and Mössbauer measurements. The obtained results indicate that both the measured density and calculated molar volume increase with Fe 2 O 3 content. IR spectra revealed the characteristic absorption bands of BO 3, and BO 4 structural unites. The optical absorption spectra of the glass samples featured four bands which are characteristic of Fe 3+ in tetrahedral (Td) symmetry. The ligand field strength (10Dq), Racah parameters (B and C) and nephelauxetic effect ( h ) were calculated. ESR spectra were consistent with the optical findings, showing a broad resonance signal at g ~2.1, sharp signal at g ~4.1 and tiny shoulder (kink) at g ~ 6.7. Mössbauer spectra show two phases of iron ions existing within the glass network, the first is related to Fe 3+ ions in octahedral (Oh) sites with the isomer shift (0.675–0.553) mm s −1 , the second is related to Fe 3+ ions in Td sites with the isomer shift below 0.34 mm s −1 . • The research reports on the identification of near-edge optical transitions originating from Fe ions embedded in B 2 O 3 glass. • The impact of Fe ions on the structural and optical properties of the samples was studied by a set of commentary techniques. • The ligand field strength (10Dq), Racah parameters (B and C) and nephelauxetic effect ( h ) were calculated.

Spectroscopic and luminescent properties of the lithium tetraborate glass co-doped with Nd and Ag

Spectroscopic and luminescent properties of the Nd-doped and Nd–Ag co-doped borate glasses with Li2B4O7 (Li2O–2B2O3) basic composition are investigated and analysed using optical absorption, electron paramagnetic resonance (EPR), photoluminescence (excitation, emission, decay kinetics) experimental methods and Judd–Ofelt analysis. Optical absorption, photoluminescence spectra and decay kinetics of Nd3+ ions were registered and detailed analysed. Experimental and theoretical oscillator strengths (fexp and ftheor), Judd–Ofelt intensity parameters (Ω2, Ω4, Ω6), and important to laser applications radiative parameters such as probabilities of radiative transitions (Arad), branching ratios of luminescence (β), radiative lifetimes (τrad), emission cross-sections (σem), and quantum efficiency (η) of the Nd3+ luminescence in the Li2B4O7:Nd and Li2B4O7:Nd,Ag glasses have been calculated. Broad absorption band of surface plasmon resonance (SPR) related to silver nanoparticles was observed in the Li2B4O7:Nd,Ag glass. Presence of the Ag paramagnetic centres and aggregates in the Li2B4O7:Nd,Ag glass was confirmed by EPR spectroscopy. Photoluminescence emission and excitation spectra as well as decay kinetics of the Ag+ ions and small non-plasmonic Ag aggregates or nanoclusters were registered and discussed. Observed enhancement of the Nd3+ luminescence intensity in the Li2B4O7:Nd,Ag glass is explained by effects induced by SPR of the Ag nanoparticles as wells energy transfer from Ag+ ions and Ag aggregates to the Nd3+ ions.

Dielectric and Thermal Properties of Tetragonal PbTiO3 Nanoparticles/Clusters Embedded in Lithium Tetraborate Glass Matrix

PbTiO3 nanoparticles/clusters embedded in lithium tetraborate glass matrix (glass nanocomposite (GNCs)) of composition (100-x) Li2B4O7-xPbTiO3 (where x = 5, 10, 15 and 20 in mol %) were synthesized. The presence of glassy phase in all GNCs samples was identified by X-ray diffraction (XRD) and differential scanning calorimetric (DSC) studies. The structure of PbTiO3 used in the preparation of these samples is a ferroelectric tetragonal phase (space group P4mm) which is confirmed by Rietveld refinement of XRD data. Transmission electron microscopic (TEM) images exhibit PbTiO3 nanoparticles/clusters phase embedded in lithium tetraborate glass matrix. The ferroelectric to paraelectric phase transition of PbTiO3 nanoparticles/clusters in the GNCs samples was established from DSC and dielectric studies. The thermal, density, dielectric and Ac conductivity behavior of the GNCs samples depends on the change in the coordination number of the network former and the concentration of PbTiO3 in the glass matrix.

Spectroscopic and luminescent properties of the lithium tetraborate glass co-doped with Tm and Ag

Spectroscopic properties of the Tm3+ (4f12, 3H6) ions in Tm-doped and Tm–Ag co-doped glasses with Li2B4O7 (or Li2O–2B2O3) basic composition are studied. All investigated glasses show intense blue, red, and infrared emission bands of the Tm3+ ions. Experimental and theoretical oscillator strengths (fexp and fcal), Judd–Ofelt intensity parameters (Ω2, Ω4, Ω6) and radiative properties such as probabilities of radiative transition (Arad), branching ratios (β), radiative lifetimes (τrad), and quantum efficiencies (η) of the Tm3+ luminescence in the Li2B4O7:Tm and Li2B4O7:Tm,Ag were calculated. Presence of the Ag0 (4d105s1, 2S1/2) and Ag2+ (4d9, 2D5/2) paramagnetic centres and their aggregates in the Li2B4O7:Tm,Ag glass was confirmed by electron paramagnetic resonance. Luminescence spectra and decay kinetics of the Ag+ (4d10, 1S0) ions and small non-plasmonic Ag aggregates were registered and discussed. Increasing of quantum efficiency and yield of the Tm3+ luminescence in the Li2B4O7:Tm,Ag glass is explained by energy transfer from Ag species to the Tm3+ ions.

Enhancing the Nonlinear Optical Properties of Lithium Tetraborate Glass Using Rare Earth Elements and Silver Nanoparticles

In recent years, nonlinear optics field is in constant growth, particularly on the characterization and study of optical properties of glass compounds. In this sense, the plasmonic effect caused by silver nanoparticles (SNP) on the nonlinear optical (NLO) properties of different materials was studied. Furthermore, we report the experimental absorption spectra, the emission spectra, Z-scan measurements in both closed and open apertures and scanning transmission electron microscopy (STEM) to show the morphology of the matrices and the nucleation of SNP. Moreover, some NLO parameters were calculated, such as the NL refraction index and NL coefficient absorption of lithium tetraborate (Li2B4O7) glass activated with rare earths (Dy3+ and Yb3+), as well as study of the effect of different concentrations of SNP. From the results obtained, it has been ascertained that the plasmon resonance caused by the presence of SNP enhances the NL refraction index value, as well as most of its linear optical properties in the matrix of Li2B4O7.

Effect of silver co-doping on enhancement of the Sm3+ luminescence in lithium tetraborate glass

Luminescent properties of the Sm3+-doped and Sm3+-Ag co-doped glasses with Li2B4O7 (or Li2O–2B2O3) basic composition are investigated and analysed. Spectroscopic properties of the obtained Li2B4O7:Sm and Li2B4O7:Sm, Ag glasses were studied using measurements of optical absorption, electron paramagnetic resonance (EPR), photoluminescence (excitation, emission, decay kinetics), and quantum yield (QY) via an absolute method. Optical absorption spectra exhibit absorption bands related with transitions from the ground 6H5/2 state of Sm3+ ions to several excited states. Photoluminescence spectra of the Sm3+-doped glasses reveal emission bands, which correspond to the 4G5/2 → 6HJ (J = 5/2–13/2) transitions of Sm3+ ions. Luminescence excitation spectra and decay curves of the Sm3+ luminescence also have been analysed. The EPR study confirms presence of Ag species in the Sm3+-Ag co-doped samples. Photoluminescence emission and excitation spectra and luminescence decay kinetics of the Ag+ ions and small non-plasmonic molecule-like silver (ML-Ag) nanoclusters are observed and discussed. Enhancement of Sm3+ luminescence in the Li2B4O7:Sm, Ag glass has been observed. Measurements confirm the increasing of external QY of the Sm3+ luminescence in 1.43 times in the Ag co-doped glass. Such enhancement of the luminescence is attributed to the excitation energy transfer from Ag+ ions and ML-Ag nanoclusters to the Sm3+ ions. The obtained high QY of the Sm3+ luminescence shows that Li2B4O7:Sm, Ag glasses belong to promising luminescent materials.