Radiative and non radiative spectroscopic properties of Er 3+ ion in tellurite glass (original) (raw)
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Spectroscopic properties of Er 3 þ ions in multicomponent tellurite glasses
In the present work, multicomponent tellurite glasses were elaborated by the melt quench technique with different concentrations of Er 3 þ ions. Amorphous nature of all the glasses was confirmed using X-ray diffraction patterns. The thermal parameters, such as glass transition temperature (T g) and the onset of crystallization temperature (T X), were determined by the differential scanning calorimetry. Judd–Ofelt parameters were derived for 0.5 mol% Er 3 þ-doped glass from the absorption measurements, and in turn, used to find the radiative properties of 4 S 3/2 , 2 H 11/2 and 4 I 11/2 levels of Er 3 þ ion. A green emission corresponding to 4 S 3/2-4 I 15/2 and 2 H 11/2-4 I 15/2 transitions of Er 3 þ ions was observed in the glasses under investigation. Efficient green upconversion luminescence was observed under 976 nm excitation. The emission bands centered at 529 and 543 nm confirmed that two photons contribute to the upconversion processes. We have also analyzed the dependence of downconversion as well as upconversion as a function of Er 3 þ ion concentration, which shows quenching of photoluminescence intensity above 0.5 mol% doping. From the emission spectra, CIE color coordinates of 0.5 mol% Er 3 þ-doped glass was examined. Fluorescence decay curves for the 4 S 3/2-4 I 15/2 transition for all the doped glasses have been measured and analyzed. Absorption cross-section and calculated emission cross-section, using the McCumber method, for the 4 I 13/2 2 4 I 15/2 transitions were evaluated and discussed.
Study of luminescence properties of Er3+-ions in new tellurite glasses
Optical Materials, 2004
The effects of concentration of Er 3þ ions in tellurite glasses on the decay time, spectral width and weighted spectral peak are studied. A broad emission spectrum of width 121 nm peaked at wavelength of 1.5 lm is obtained in 2.5 mol% Er doped glasses. The maximum decay time of 4 I 13=2 fi 4 I 15=2 transition (at wavelength 1.5 lm) is about 4.5 ms for 1.0 mol% Er doped glasses. Strong green and red upconversion emission at emission 550 nm ( 4 S 3=2 fi 4 I 15=2 ) and 670 nm ( 4 F 9=2 fi 4 I 15=2 ) are observed from Er 3þ -doped tellurite glasses upon continuous wave excitation at 975 nm. It is found that the upconversion efficiency goes up with the increasing concentration of the Er 3þ ions.
Journal of Non-Crystalline Solids, 2007
Absorption, emission, excitation spectra and the lifetime of the 4 S 3/2 excited luminescent state of Er 3+ ions in a fluorine containing (lead, lanthanum)-tellurite glass have been studied. The glass exhibits a strong green luminescence upon excitation through 380 nm (4 I 15/2 ! 4 G 11/2) absorption band of its Er 3+ ions. The spectrum consists of a strong green component in the wavelength range 534-553 nm due to luminescence transitions 2 H 11/2 ! 4 I 15/2 and 4 S 3/2 ! 4 I 15/2 and a very weak red component in the range 650-710 nm due to 4 F 9/2 ! 4 I 15/2 transition. The Stark split components of the 4 S 3/2 state are not very clear in the spectrum, but the biexponential luminescence decay of the 4 S 3/2 state confirms the presence of the Stark levels. A rapid conversion of the upper Stark level to the lower level is also evident from the decay kinetics which helps greater number of ions to populate in the lower stark level of the 4 S 3/2 state. Thus, the present study indicates that the glass may be a suitable candidate for use as a laser medium in making a solid state green laser by pumping the later by normal route.
Journal of Solid State Chemistry, 2003
Red, green, and blue emission through frequency upconversion and energy-transfer processes in tellurite glasses doped with Tm 3+ and Er 3+ excited at 1.064 mm is investigated. The Tm 3+ /Er 3+ -codoped samples produced intense upconversion emission signals at around 480, 530, 550 and 660 nm. The 480 nm blue emission was originated from the 1 G 4 -3 H 6 transition of the Tm 3+ ions excited by a multiphoton stepwise phonon-assisted excited-state absorption process. The 530, 550 nm green and 660 nm red upconversion luminescences were identified as originating from the 2 H 11/2 , 4 S 3/2 -4 I 15/2 and 4 F 9/2 -4 I 15/2 transitions of the Er 3+ ions, respectively, populated via efficient cross-relaxation processes and excited-state absorption. White light generation employing a single infrared excitation source is also examined. r
Journal of Applied Physics, 2007
An in-depth spectroscopic study is performed on Er 3+ ͑4f 11 ͒ ions doped into a fluorine containing ͑lead, lanthanum͒-tellurite glass host, containing nominal 1.93 at. % of Er 3+ . The standard Judd-Ofelt ͑JO͒ model is applied to the room temperature absorption intensities of Er 3+ ͑4f 11 ͒ transitions in the tellurite glass host to obtain three phenomenological intensity parameters, ⍀ 2 , ⍀ 4 , and ⍀ 6 . These parameters are subsequently used to determine the radiative decay rates, radiative lifetimes, and branching ratios of the Er 3+ transitions from the upper multiplet manifolds to the corresponding lower-lying multiplet manifolds 2S+1 L J of Er 3+ ͑4f 11 ͒ in the tellurite glass host. The emission cross sections of the intermanifold Er 3+ 4 I 13/2 → 4 I 15/2 ͑1.5 m͒ and 4 S 3/2 → 4 I 15/2 ͑540 nm͒ transitions have been determined. The room temperature fluorescence lifetimes of the 4 I 13/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions in this tellurite glass host were also measured. From the radiative lifetime determined from the JO model and measured fluorescence lifetime, the quantum efficiency of this material was also determined. The spectroscopic properties were compared with those of Er 3+ ͑4f 11 ͒ in other halotellurite glass hosts. We also analyzed the band structure observed in the absorption spectra of Er 3+ in the tellurite glass at 8 K. The structure can be interpreted in terms of the ligand-field splitting of the energy levels of the Er 3+ ion in the local environment established by the glass matrix into which Er 2 O 3 has been introduced. The spectroscopic analysis of Er 3+ ͑4f 11 ͒ suggests that the tellurite glass is an excellent candidate for various photonic applications.
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.
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.
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.
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.
Er 3+ ion dispersion in tellurium oxychloride glasses
Optical Materials, 2007
Erbium-doped tellurite glasses in the 60TeO 2 -20ZnO-20ZnCl 2 -xErCl 3 systems, with erbium concentration between x = 1 and 10 mol%, were prepared and their refractive index and density were measured. Er 3+ photoluminescence at 1.5 lm and the corresponding lifetime measurements were performed. A full width at half maximum value of about 53 nm for all the samples and lifetimes ranging between 4.2 and of 2.2 ms were obtained from the comparison of the radiative lifetimes calculated by Judd-Ofelt analysis and the measured lifetimes, quantum efficiency higher than 50% was assessed even in the most doped samples. A quenching concentration for the 1.5 lm emission of about 10% was estimated.