1.55μm emission and upconversion luminescence of Er3+-doped strontium borate glasses (original) (raw)
Related papers
Journal of Luminescence, 2011
The optical properties of Er 3 + ions in a novel glass based on TeO 2 -PbF 2 -AlF 3 oxyfluoride tellurites have been investigated using steady-state and time-resolved spectroscopies as a function of the rare-earth doping concentration. Basic optical characterizations have been performed measuring and calculating the absorption and emission spectra and the cross-sections, the Judd-Ofelt intensity parameters, the radiative probabilities and the fluorescence decays and lifetimes. Special attention has been devoted to the broad 4 I 13/2 -4 I 15/2 emission transition at around 1.53 mm since, with a wide broadening of around 70 nm and a relative long lifetime of around 3 ms compared to others glass hosts, it shows potential applications in the design of erbium-doped fiber amplifiers. The absorption, the stimulated emission and the gain cross-sections of this transition have been obtained and compared with that obtained in different hosts. Finally, infrared-to-visible upconversion processes exciting at around 800 nm have been analyzed and different mechanisms involved in the energy conversion have been proposed.
The optical properties of Er 3 + ions in a novel glass based on TeO 2 -PbF 2 -AlF 3 oxyfluoride tellurites have been investigated using steady-state and time-resolved spectroscopies as a function of the rare-earth doping concentration. Basic optical characterizations have been performed measuring and calculating the absorption and emission spectra and the cross-sections, the Judd-Ofelt intensity parameters, the radiative probabilities and the fluorescence decays and lifetimes. Special attention has been devoted to the broad 4 I 13/2 -4 I 15/2 emission transition at around 1.53 mm since, with a wide broadening of around 70 nm and a relative long lifetime of around 3 ms compared to others glass hosts, it shows potential applications in the design of erbium-doped fiber amplifiers. The absorption, the stimulated emission and the gain cross-sections of this transition have been obtained and compared with that obtained in different hosts. Finally, infrared-to-visible upconversion processes exciting at around 800 nm have been analyzed and different mechanisms involved in the energy conversion have been proposed.
Visible up-conversion and near-infrared luminescence of Er 3þ /Yb 3þ co-doped SbPO 4 -GeO 2 glasses
Recent advances in glass chemistry have led to new multifunctional optical glasses of great technological importance. Glasses containing high amounts of antimony have been studied for use in nonlinear optics, near-infrared transmission, and as hosts for rare-earth ions in photonic devices. This work describes a luminescence study of Er 3þ and Er 3þ /Yb 3þ co-doping in a new SbPO 4-GeO 2 binary glass system. Near-infrared and visible up-conversion emissions were observed in the green and red regions, which are enhanced when the samples are co-doped with Yb 3þ. Near-infrared emissions have good quantum efficiency and full width half maximum of 61 nm. Visible up-conversion emissions are governed by two photons and described by excited state absorption, energy transfer and cross-relaxation processes.
Optik, 2019
Er 3+-doped glasses are important materials to develop upconvertors, sensors, optical fibers and green solid state lasers. The upconversion and near-infrared transitions in Er 3+-Yb 3+ co-doped phosphate glasses are studied in this work and an improvement of 45% in the quantum efficiency of the glasses is observed by the addition of 1 mol% of Yb 2 O 3. Judd-Ofelt analysis, lifetime of some excited states of Er 3+ ions and energy transfer mechanisms are discussed.
Journal of Alloys and Compounds, 2018
Efficient up-converted lasing materials are required for high performing, durable and low cost photonic devices. Rare earth ions doped glass systems with modified optical properties may meet this need. In this view, erbium (Er 3+) ions doped zinc-magnesiumtellurite glass system of composition (75-x)TeO 2-15ZnO-10MgO-xEr 2 O 3 (0.5 ≤ x ≤ 2.0 mol%) was prepared via melt-quenching method. Optical behavior of such glasses was determined as a function of changing Er 2 O 3 content to examine the feasibility of achieving up-converted lasing media. Judd-Ofelt (J-O) intensity (Ω 2 , Ω 4 , Ω 6) and radiative parameters were evaluated. Glass hardness was increased linearly with increasing Er 3+ ions concentration. The emission spectra revealed three peaks around 470 nm, 500 nm and 550 nm. Effect of Er 2 O 3 content on the 4 I 13/2 → 4 I 15/2 transition was quantified in terms of fluorescence intensity and lifetime. The width of the near-infrared fluorescence band (1.53 µm) was broadened from 58.77 to 60.01 nm with the increase of Er 2 O 3 content from 0.5 and 2.0 mol%. The proposed glass compositions were demonstrated to be potential for solid-state lasers, near infrared sensors, and other optical devices.
Visible up-conversion and near-infrared luminescence of Er3+/Yb3+ co-doped SbPO4-GeO2 glasses
Optical Materials, 2016
Recent advances in glass chemistry have led to new multifunctional optical glasses of great technological importance. Glasses containing high amounts of antimony have been studied for use in nonlinear optics, near-infrared transmission, and as hosts for rare-earth ions in photonic devices. This work describes a luminescence study of Er 3þ and Er 3þ /Yb 3þ co-doping in a new SbPO 4-GeO 2 binary glass system. Nearinfrared and visible up-conversion emissions were observed in the green and red regions, which are enhanced when the samples are co-doped with Yb 3þ. Near-infrared emissions have good quantum efficiency and full width half maximum of 61 nm. Visible up-conversion emissions are governed by two photons and described by excited state absorption, energy transfer and cross-relaxation processes.
Journal of Non-Crystalline Solids, 2006
Sodium phosphoniobate glasses with the composition (mol%) 75NaPO 3-25Nb 2 O 5 and containing 2 mol% Yb 3+ and x mol% Er 3+ (0.01 6 x 6 2) were prepared using the conventional melting/casting process. Er 3+ emission at 1.5 lm and infrared-to-visible upconversion emission, upon excitation at 976 nm, are evaluated as a function of the Er 3+ concentration. For the lowest Er 3+ content, 1.5 lm emission quantum efficiency was 90%. Increasing the Er 3+ concentration up to 2 mol%, the emission quantum efficiency was observed to decrease to 37% due to concentration quenching. The green and red upconversion emission intensity ratio was studied as a function of Yb 3+ co-doping and the Er 3+-Er 3+ energy transfer processes.
Infrared to Visible Upconversion Light Emission in Er 2 O 3 and Yb 2 O 3 DOPED GeO 2-PbF 2 Glasses
2013
Upconversion properties of the glass with the composition 70GeO2+ (29.5-x) PbF2+ 0.5 Er2O3 + x Yb2O3 glasses, where x= 0, 0.5 and 1.5 mol. % under 808 nm excitation was investigated. The intense green (534 and 550 nm) and red (639 nm) emissions corresponding to the transitions H11/2 →I15/2, S3/2 → I15/2 and F9/2 → I15/2, respectively, were simultaneously observed at room temperature. The PbF2 content offered an important influence on upconversion luminescence emission effectiveness. With increasing PbF2 content, the intensities of the green (534 nm) and red (639 nm) emissions increase slightly, while the green (550 nm) emission increases significantly. The results were explained on the basis of electron-phonon interaction.
Fluoroindate glasses co-doped with Pr3+/Er3+ for near-infrared luminescence applications
Scientific Reports, 2020
Fluoroindate glasses co-doped with Pr 3+ /Er 3+ ions were synthesized and their near-infrared luminescence properties have been examined under selective excitation wavelengths. For the Pr 3+ /Er 3+ co-doped glass samples several radiative and nonradiative relaxation channels and their mechanisms are proposed under direct excitation of Pr 3+ and/or Er 3+. The energy transfer processes between Pr 3+ and Er 3+ ions in fluoroindate glasses were identified. In particular, broadband nearinfrared luminescence (FWHM = 278 nm) associated to the 1 G 4 → 3 H 5 (Pr 3+), 1 D 2 → 1 G 4 (Pr 3+) and 4 I 13/2 → 4 I 15/2 (Er 3+) transitions of rare earth ions in fluoroindate glass is successfully observed under direct excitation at 483 nm. Near-infrared luminescence spectra and their decays for glass samples co-doped with Pr 3+ /Er 3+ are compared to the experimental results obtained for fluoroindate glasses singly doped with rare earth ions. Fluoroindate glasses belong to the low-phonon Heavy Metal Fluoride Glass (HMFG) family, which have been extensively studied for their numerous optical applications. From literature data it is well-known that fluoroindate glasses containing rare earth ions with their lower phonon energies close to 510 cm −1 are promising materials for up-conversion luminescence applications. For example, the laser based on the orange-to-ultraviolet conversion in a Nd 3+ doped fluoroindate glass powder has been well demonstrated 1. These effects are practically not possible to obtain in Nd 3+ doped oxide or oxyfluoride glass host matrices. Generally, the efficient up-conversion luminescence of Pr 3+ , Tm 3+ and Ho 3+ ions in fluoroindate glasses 2-4 was successfully observed. Moreover, the upconversion luminescence spectra of Pr 3+ , Ho 3+ and Tm 3+ ions in fluoroindate glasses 5-9 are enhanced drastically in the presence of Yb 3+. In the later system 9 , i.e. Tm 3+ /Yb 3+ co-doped fluoroindate glass, the blue up-conversion luminescence of Tm 3+ ions is highly increased with Yb 3+ concentration. For the optimum Tm 3+ concentration (0.5 mol%), the up-conversion emission intensity was increased by a factor about 100 by co-doping with 2.25 mol% of Yb 3+. In particular, fluoroindate glasses singly doped with Er 3+ ions and doubly doped with Er 3+ / Yb 3+ ions have been examined for up-conversion luminescence 10-13 , which was measured under 790 nm, 980 nm or 1480 nm laser excitation. The up-conversion luminescence processes of Er 3+ were analyzed with activator concentration, temperature, pumping wavelength and power of diode laser used as the excitation source. In general, the up-conversion results in a strong green emission and weaker blue and red emissions and the Yb 3+ co-doping will certainly increase the efficiency of an up-conversion-based optical device. Further investigations confirmed this hypothesis. An intensity enhancement of 4.5 for the green up-conversion luminescence in Er 3+ /Yb 3+ co-doped fluoroindate glass has been obtained by focusing the incoming beam with a 3.8 μm silica microsphere 14. Also, these experimental results open a new method to improve the up-conversion emission intensity in biological samples with rare earth doped nanoparticles that can be used as nano-sensors. In another case, the generation of photocurrent in a commercial solar cell has been achieved under excitation at 1480 nm in fluoroindate glass samples co-doped with Er 3+ /Yb 3+ ions 15. Fluoroindate glasses with their excellent spectroscopic properties offer the possibility of using these materials not only in the operation of erbium up-conversion lasers. Also, they belong to promising glass materials emitting near-infrared radiation. Nowadays there is a great interest in compact lasers operating in the near-infrared (1.5 μm) and mid-infrared (2.8 μm) for optical communications, medical and eye-safe light detecting and ranging applications. However, the near-infrared luminescence studies were limited practically to fluoroindate glasses containing Er 3+ or Er 3+ /Yb 3+ ions 10,13. Luminescence spectra exhibit a highly intense signal at 1.
Optical properties of Er 3+ ions in transparent glass ceramics
Journal of Alloys and Compounds, 2001
A study of optical properties and upconversion processes among Er ions in oxyfluoride glass and glass ceramic matrix has been carried out. From optical absorption spectra, the oscillator strengths have been obtained for several transitions and they have been used to calculate the Judd-Ofelt parameters. Experimental lifetime values are compared with those obtained with the Judd-Ofelt theory. Different 31 upconversion emissions at 545, 660 and 800 nm have been obtained in Er doped glass and glass ceramics by exciting at 975 nm. A systematic investigation of the green upconversion is reported with the purpose of determining the involved upconversion mechanisms.