Luminescence Properties Of Glasses Research Articles

Insights into enhanced broadband near-infrared emission of Bi-doped aluminosilicate glass by the addition of SnO

A series of Bi/Sn co-doped aluminosilicate glasses were prepared and the optical and structural properties of the samples were investigated. The near-infrared (NIR) luminescence properties of the glass were significantly improved by the co-doping of Bi and Sn. The NIR emission peaks of samples exhibit near 1220 nm. The addition of SnO changes the glass structure and induces a decrease in the number of negative charges in the local field of Bi, which causes the Bi valence state to change from a high valence state to a low valence state. The appropriate amount of Bi2O3 increases the number of Bi luminescent centers and realizes the transformation of the luminescent centers from Bi+ to Bi0. These results suggest that regulating the doping concentration of SnO and Bi2O3 is a convenient method to control the valence state of active ions and enhance the NIR luminescence properties of aluminosilicate glasses.

Peculiarity of the Structure and Luminescence of Glasses in La2S3-Ga2S3-GeS2:Pr3+ System.

The effect of modifying the composition of a glass matrix based on the Ga2S3-GeS2:Pr3+ system due to the addition of La2S3 on the structure and the optical and luminescent properties of these glasses has been studied. It has been shown that the addition of La2S3 leads to changes in the nearest structural environment of Ga, Ge, and S and increases the degree of ionicity of the bonds of the Pr3+ ion. Despite the existence of a large glass formation region in the Ga2S3-GeS2-La2S3 system and the structural and chemical similarity of La and Pr, La2S3 does not promote a more uniform distribution of Pr3+ ions in the glass matrix, and thus does not reduce the concentration quenching of the luminescence of Pr3+ ions. However, the addition of La2S3 increases the probability of emission of Pr3+ ions and decreases the radiative lifetime. Additionally, it was shown that, when studying the structure and luminescent properties of glasses with La, it is necessary to take into account a significant concentration of rare earth traces (Pr and Nd).

Structural and luminescence behavior of Eu3+ ions in ZnO-B2O3-WO3 glasses

Structure and luminescence properties of glasses with compositions 50ZnO:40B2O3:10WO3:xEu2O3, 0 ≤ x ≤ 10 mol% were studied using infrared, Raman and photoluminescence spectroscopic techniques. Physical properties like density, molar volume, oxygen molar volume and oxygen packing density of the glasses were also determined. The overall results obtained indicate the efficiency of the 50ZnO:40B2O3:10WO3 glass structure for the luminescence performance of doped Eu3+. The most intense luminescence peak observed at 612 nm and the high integrated emission intensity ratio (R) of the 5D0→7F2/5D0→7F1 transitions at 612 and 590 nm of 5.77 suggest that the glasses are potential materials for red emission. The results are compared to measurements of a glass without WO3 addition (50ZnO:50B2O3:5Eu2O3) and results from other publications of similar glasses.

Photoluminescence and scintillation of Sn2+-doped gadolinium aluminum-silicate glasses

The photoluminescence and scintillation properties of Sn2+-doped gadolinium aluminum-silicate Gd2O3–Al2O3–SiO2 (GAS) glasses with Si3N4 as reducing agent were investigated. The glasses showed a wide emission band in the range of 360–730 nm due to the relaxation of S1–S0 and T1-S0 of Sn2+ luminescent centers. The luminescent intensity of Sn2+-doped GAS glasses reaches maximum at 0.3 mol% Sn2+. The lifetimes of the glasses vary between 6 and 12 μs, which related to the full width at half maximum (FWHM) of the emission spectra. Different oxides were added to explore the relationship between optical basicity and the luminescent properties of glasses. The addition of B2O3 increases the photoluminescence quantum yield (PL QY) of the glasses, which is due to reduction of the Stokes shift and increment of radiative transition probability in energy level transition. The X-ray induced scintillation luminescence of the glasses were observed and studied.

Luminescence properties of Tb3+/Eu3+ co-doped glass based on GSBR system

In this work, a series of Tb3+/Eu3+ co-doped GeO2-SiO2-BaO-R2O3 (GSBR) glass were synthesized through high temperature melt cooling method. Luminescence properties of Tb3+/Eu3+ co-doped glass were studied by fluorescence spectrum, fluorescence lifetime and CIE coordinate. The energy transfer efficiency and probability were calculated by average donor distance and lifetime data, revealing that the type of energy transfer is the electric dipole-electric dipole interaction for Tb3+→Eu3+. And the efficiency of energy transfer from Tb3+ to Eu3+ increased greatly by increasing Eu3+ concentrations, which play an important role in adjusting the color at the excitation of 378 nm. The effects of different R2O3 (Gd2O3, Al2O3, Ga2O3) in the matrix on the luminescence intensity of the glass samples were compared. It was found that the luminescence intensity order of samples was Al2O3>Ga2O3>Gd2O3. Through the analysis of infrared and fluorescence spectra, the effects of different matrices components on the structure and luminescence properties of glass were revealed.

Luminescent Properties of Glasses Based on Lithium Tetraborate Doped with Sm3+ and Gd3+

Luminescent Properties of Glasses Based on Lithium Tetraborate Doped with Sm3+ and Gd3+

Luminescence behavior of Nd3+ions doped ZnO-BaO-(Gd2O3/GdF3)- P2O5 glasses for laser material applications

In current study Neodymium doped phosphate glasses were prepared and subsequently the Physical and luminescence properties of these glasses were thoroughly analyzed. In total, eleven absorption bands centered at 352, 431, 474, 512, 526, 583, 626, 683, 746, 803 and 875 nm were observed in absorption spectra. Similarly, the emission spectra of the prepared glasses recorded with 804 nm excitation show three radiative transitions peaks at 873, 1054 and 1333 nm. The luminescence properties of present glasses analyzed theoretically as several radiative properties studied through Judd-Ofelt theory. The emission cross section for 4F3/2→4I11/2 transition of Nd3+ ions, measured to be 11.2 × 10−20 cm2 in the case of oxide and 13.10 × 10−20 cm2 in the case of oxyfluoride glass. Similarly, the calculated and measured branching ratio for oxide glass are 54% and 51% respectively, and for oxyfluoride glass the calculated and measured branching ratios are 53% and 55% respectively. From the FTIR spectra it is noted that the bands correspond to the OH group show low transmittance intensity in oxyfluoride glass than oxide glass which is an evident of low OH contents oxyfluoride glass. In conclusion, from the results of present study reveal that the oxyfluoride glasses reported in present work can be a possible material for laser applications.

Regulation of luminescence properties of SBGNA:Eu3+ glass by the content of B2O3 and Al2O3

The low luminosity limits the use of luminescent glass doped with rare earth ions as a luminescent material, and the matrix composition has a significant effect on the luminescent properties of the glass. Eu3+ ion-doped SiO2-B2O3-Gd2O3-Na2O-Al2O3 (SBGNA) glass was prepared by a high temperature melting method. The influence of the concentration of B2O3 and Al2O3 in the glass matrix on the luminescence properties of glass was studied. XPS tests indicate the presence of Eu3+ and Eu2+ in the glass. As the concentration of B2O3 and Al2O3 in the matrix increased, the luminosity of Eu3+ ions was the largest, while the luminosity of Eu2+ ions increased. The structural reason of this phenomenon was analyzed by infrared spectrum. By changing the composition of the glass substrate, the light emitting performance of the glass can be improved.

Luminescent properties of Eu3+ doped heavy tellurite scintillating glasses

Eu3+ doped tellurite scintillating glasses were prepared by the conventional melt-quenching method. The physical and luminescent properties of glasses were investigated by DTA, density, transmittance spectra, photoluminescence spectra, and X-ray excited luminescence (XEL) spectra. The densities of the glasses are in the range from 5.89 g/cm3 to 6.05 g/cm3. The glasses exhibit intense red emissions upon 393 nm light and X-ray excitations. The maximum integral XEL intensity of the glasses is about 6% of that of commercial Bi4Ge3O12 (BGO) scintillating crystal. The results reveal that Eu3+ doped tellurite glass could be a scintillator candidate used in X-ray detection field.

The role of the REE ions in the glass systems TeO2–PbO·P2O5–PbF2:MF3 (M–Er, Nd)

The glasses doped with the Er3+, Nd3+ ions were synthesized in the oxyfluoride system TeO2–PbO·P2O5–PbF2:МF3 and studied by the IR and Raman spectroscopy (including low-frequency range of spectra), DSC, SAXS and luminescence methods. The role of REE ions in the structure forming, crystallization and luminescent properties of glasses is identified. It was found that the rare-earth element ions enter into the medium range order of glass structure and act as crystallite forming nuclei. The contribution of the Er3+ photoluminescence with emission levels at 524, 530, 545, and 554 nm into the inelastic scattering spectrum of glasses in the system of TeO2–Pb2O5·PbO–PbF2:xErF3 has been revealed.

Relationship investigation of structure and properties of Nd3+: Ga2O3-Al2O3-PbO-CaO via Raman, infrared, NMR and EPR spectroscopy

A detailed study structure and luminescence properties of Nd3+: Ga2O3-Al2O3-PbO-CaO laser glasses was conducted. The network structure was mainly dominated by Al (IV) or Ga (IV). With the increase of the Al2O3 content, the Al (IV) content increases, whereas the Ga (IV) content decreases. Hyperfine sublevel correlation (HYSCORE) spectra reveal 27Al and 207Pb weak hyperfine coupling, which indicates that these nuclei are in the second- or higher-order Nd3+ coordination sphere. No 69Ga or 71Ga signals can be detected in the three-pulse electron spin echo envelope modulation (3P-ESEEM) and HYSCORE spectra. For germanate glass, the local environment of the Nd3+ ions is characterized by the Pb ligand, for aluminum gallium glasses, the Nd3+ ions are surrounded by Al3+ and Pb2+ ions, and for aluminum glass, Nd3+ ions are mainly surrounded by 27Al cations. The change in the structure and in the local environment of Nd3+ ions results in a change in the luminescence properties of glasses.

Tunable broad photoluminescence in Cu+/Mn2+ co-doped oxyfluoride glasses sintered in air atmosphere

In order to explore luminescent materials for spectra modification, a series of Cu+ and Mn2+ doped oxyfluoride glasses were successfully prepared via melt-quenching method. A simple, efficient and universal method was used to gain monovalent copper ions in air atmosphere by adding aluminum powder as reducing agent. The luminescent properties of glasses were systematically investigated through optical absorption, photoluminescence and decay curves. Under ultraviolet excitation, Cu+ singly doped glass emits broad luminescence band, and its emission band shifts to red with increasing excitation wavelength. Through an efficient energy transfer process, Cu+-Mn2+ co-doped samples generate the varied hues from blue to white and eventually to red. Luminescent quantum yield and energy transfer efficiency were obtained. Our results demonstrate that Cu+-Mn2+ co-doped glasses have potential application in white LEDs as well as photosynthesis of green plants.

Preparation and optical properties of Er3+: Na2O-Al2O3-SiO2 transparent glass-ceramics

Na2O-Al2O3-SiO2 glass-ceramics doped with Er3+ ions were synthesized by the conventional melt quenching technique at a low melting temperature. The samples were characterized by differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis-NIR scanning spectrophotometry, and fluorescence spectrometry. The results show that the main crystalline phase of glass-ceramics is nepheline.The best heat-treatment process is at 520 °C for 2 h. Because the up-conversion luminescence and near infrared luminescence properties of glass doped with Eu3+ are studied in detail.

Composition-induced tunable white emission in Ce/Tb/Eu co-doped lithium–barium borophosphate glasses

Ce/Tb/Eu co-doped lithium–barium borophosphate glasses were successfully synthesized by melt quenching method. The structure and luminescence properties of glasses were characterized by Fourier transform infrared spectroscopy, photoluminescence spectra spectroscopy and colorimetric analysis. The influence of matrix composition on glass structure and photoluminescent properties was investigated in detail. The partial replacement of BaO for B2O3 changed the ratios of Ce3+/Ce4+ and Eu2+/Eu3+, and altered the glass structure, which affected the physical properties of the glass samples. The emission intensity of Ce3+, Eu2+ and Tb3+ decreased with increasing BaO content, but the intensity of Eu3+ increased continuously. Energy was transferred from Ce3+, Tb3+and Eu2+ to Eu3+ ions, which resulted in the enhancement of Eu3+ luminescence intensity. Meanwhile, the colors of Ce/Tb/Eu co-doped luminescent glasses changed from cold white to warm white by changing glass matrix composition. Possible mechanisms of the reduction for valence-variable rare earth ions were also discussed.

Preparation of high-purity Pr(3+) doped Ge–Ga–Sb–Se glasses with intensive middle infrared luminescence

Glass materials with high emission characteristics and low content of limiting impurities are required for creation of devices for middle infrared (mid-IR) fiber optics. The paper presents the results of preparation of high-purity Pr3+-doped GaxGeySbzSe1−(x+y+z) (х=3÷4, у=20÷26, z=5÷11) glasses. The multi-stage technique for synthesis of these glasses is developed. It is based on chemical distillation purification of glass components and the transport reaction for purification of gallium. Transmitting, as well as thermal and luminescent properties of glasses are investigated. The content of limiting impurities of oxygen, carbon and hydrogen in the glass samples was ≤0.2ppm wt. The 1300–3000 ppm wt Pr3+-doped Ga–Ge–Sb–Se bulk glasses exhibit an intensive photoluminescence in the spectral range of 3.5–5.5μm.

Long-Lasting Phosphorescent Properties of Tb3+ Doped ZnO–P2O5–SiO2 Glasses

AbstractThe long-lasting phosphorescent glass with the composition of ZnO–P2O5–SiO2: Tb3+ was prepared by melt-quenched method. After irradiation by 254 nm light, a visible greenish light can be observed with the naked eyes, in the dark for up to 9 h after removal of the activating light. The luminescent properties of ZnO–P2O5–SiO2: Tb3+ were studied by fluorescence spectra, afterglow spectra and thermoluminescence spectra. The results show that the luminescent properties of the glasses become better with the increase of ZnO contents. The luminescent properties of glasses increase with the increase of Tb3+ contents. When 2% of ZnO is replaced by 2% of RO (RO=CaO, SrO, BaO), the luminescent property of glasses become worse in the order of CaO, SrO, BaO. The higher the contents of RO (RO=CaO, SrO, BaO) are, the worse the luminescent properties of the glasses become.

Bidirectional Energy Transfer in Bi‐Tm‐Codoped Glasses

In this manuscript, we report an ultrabroadband luminescence covering the whole 1000–1800 nm in singly doping glass, and a superbroadband emission from 1000 to 2000 nm in ‐Tm3+‐codoped glasses excited at 808, 980 nm, respectively. We also confirm a bidirectional energy transfer mechanism between and Tm3+. Broadband luminescence is used to realize 1–2 μm optical amplifier and tunable laser. Luminescent properties of glasses are investigated systematically. Peak position and intensity of the near‐infrared emission depend strongly on excitation wavelength. Based on a collaborative investigation of the photoluminescence and luminescence decay, a plausible bidirectional energy transfer mechanism between and Tm3+ is confirmed.

Ultraviolet light induced white light emission in Ag and Eu^3+ co-doped oxyfluoride glasses

Transparent Ag and Eu(3+) co-doped oxyfluoride glasses with composition 50SiO(2)-20Al(2)O(3)-30CaF(2) were prepared by melt-quenching technique. The structural and luminescent properties of glasses, energy transfer mechanism between luminescent centers were systematically investigated. The missing nanoparticles signals in absorption spectra, XRD patterns and TEM images, the additional broad excitation band at 325-375 nm indicate that the broad emission band at 400-700 nm is originated from very small molecule-like, non-plasmonic Ag particles (ML-Ag-particles). A perfect white light emission was realized by combining intense red emission of Eu(3+) with broad band emission of ML-Ag-particles. These results suggest that Ag and Eu(3+) co-doped oxyfluoride glasses could be potentially applied as white light-emitting phosphors for ultra-violet LED chips.

Broadband near-infrared luminescence in bismuth borate glasses

We report the results of our investigation on the optical properties of the bismuth borate glass (75B2O3-25Bi2O3). Unusual near-infrared (NIR) and visible band luminescence was observed when the sample was excited by lasers working at 532 and 808 nm. The NIR fluorescent lifetime of the sample measured at room-temperature was longer than two hundred microseconds. This indicated that this glass system could be a new candidate for the broadband optical amplification and laser material covering the wavelength from 1100 to 1300 nm. The influences of preparation conditions and glass compositions on the luminescence properties of glasses were investigated. It was found that the heat-treatment under air and hydrogen atmosphere can both weaken the infrared luminescence of the materials. Furthermore, with the addition of oxidation agent CeO2, the sample did not show any NIR luminescence upon the excitation of the lasers working at 532 or 808 nm. All the results indicated that the infrared luminescence center should be Bi+ ions.

Luminescent properties of BaO-La2O3-B2O3 glasses with dopant

The luminescent properties of glasses synthesized in air atmosphere by conventional high temperature process were studied. The emissions spectra of Eu2+ and Eu3+ were observed in BaO-La2O3-B2O3-Eu2O3 glasses. The results show that the broad emission peaks at 430 nm correspond to 5d→4f emission transition of Eu2+, the sharp emission peaks at 592, 616, 650 and 750 nm correspond to 5D0→7F j (j=1–4) emission transition of Eu3+, respectively, which indicates that the BaO-La2O3-B2O3-Eu2O3 glass can convert ultraviolet and green components of sunlight into blue and red light so as to increase the intensity of blue and red light, respectively. The luminescent intensity of Eu2+ increases with increasing the molar ratio of Tb3+ in BaO-La2O3-B2O3-Eu2O3-Tb4O7 glasses, whereas the luminescent intensity of Eu3+ decreases. So the luminescent intensity of Eu(III, II) is influenced by Tb3+. These phenomena can be explained by electron transfer mechanism: Eu3+ (4f6) + Tb3+ (4f8) → Eu2+ (4f7) + Tb4+ (4f7). Taking advantage of the luminescent properties of BaO-La2O3-B2O3-Eu2O3 glasses, light-conversion glass for agriculture can be produced.