Luminescence studies on Er3+ -doped zincfluorophosphate glasses for 1.53 μm laser applications

Sreedhar, V.B.; Vijaya, N.; Ramachari, D.; Jayasankar, C.K.

doi:10.1016/j.molstruc.2016.10.062

Cited by 49 publications

(12 citation statements)

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“…The obtained values are in agreement with those reported in [38,39,40]. The branching ratio (β) values for the transitions 4 I 13/2 → 4 I 15/2 , 4 I 11/2 → 4 I 15/2 , and 4 I 9/2 → 4 I 15/2 were larger than 60%, confirming the possibility of achieving efficient IR and red emissions, under suitable excitation conditions [41].…”

Section: Resultssupporting

confidence: 90%

Impact of Ag2O Content on the Optical and Spectroscopic Properties of Fluoro-Phosphate Glasses

et al. 2019

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Glasses with the system (84.60-x) NaPO3-5 ZnO-(9.40-x) NaF-x Ag2O-1 Er2O3, (x = 0, 2, 4, and 6) (mol%) were synthesized by the conventional melt-quenching method. The impact of the addition of Ag2O on the physical, thermal, structural, and optical properties of the glasses is discussed. The Judd-Oflet analysis was used to evaluate the radiative properties of the emission transitions of the glasses. The enhancement of luminescence properties due to Ag2O is discussed in terms of consequent changes in the local electromagnetic field, symmetry, and the ligand field around the Er3+ ion. The heat treatment of the glass was performed in order to precipitate Ag nanoparticles (NPs), which form as a layer at the surface of the heat-treated glasses as confirmed using scanning electron microscopy (SEM). The Ag NPs were found to increase the intensity of the emission at 1.5 µm.

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Section: Resultssupporting

confidence: 90%

Impact of Ag2O Content on the Optical and Spectroscopic Properties of Fluoro-Phosphate Glasses

et al. 2019

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“…The decrement with respect to the decay time of the diluted sample is ascribable to the migration of the excitation among the active centres, a process called fast diffusion, that continues until a Er 3+ ion finally transfers its energy to a nearby quenching trap. [ 40 ] The comparison between the evaluated decay times points towards a limited efficiency of the nonradiative processes in the considered concentration range, consistent with the steady‐state emission measurements that indicate the 7% concentration as that corresponding to the highest emission performance of the title material.…”

Section: Resultssupporting

confidence: 81%

Synthesis, characterization and optical spectroscopy of GdPO₄:Er³⁺

et al. 2020

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A series of Er 3+-doped GdPO 4 phosphors was synthesized using a conventional solid-state reaction. The monazite structure (space group P12 1 /n 1) of the obtained materials was confirmed using X-ray diffraction and Fourier transform infrared spectroscopy. Their optical spectra (excitation, emission, absorption, decay curves) were measured at room temperature in the visible and near-infrared (NIR) regions. The UV-visible-NIR optical absorption spectrum of GdPO 4 :7% Er 3+ was analyzed based on Judd-Ofelt (J-O) theory and the J-O intensity parameter (Ω 2 , Ω 4 , Ω 6) was calculated. J-O intensity parameters were used to evaluate spontaneous emission properties such as branching ratios, transition probabilities, and radiative lifetime. The calculated quantum efficiency of the 1.5 μm emission (4 I 13/2 − 4 I 15/2) was calculated to be 89%. This result proved that GdPO 4 :Er 3+ is suitable for use in optical amplifiers and is a potential host for laser applications. The most interesting transitions, located at about 540 nm, and 1.0 and 1.5 μm were investigated as a function of doping level and of temperature, to assess the conditions needed for the highest emission performance and to explore the range of application, in particular in the fields of lighting, thermal sensing, and of phosphors for bio-imaging.

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“…[52] The shorter overall lifetimes observed for Ho 3+ and Nd 3+ emissions with respect to Er 3+ are not surprising given that the radiative lifetimes of the former are typically shorter (hundreds of μs) than that of the latter (several ms). [23,53,54] The different decay behaviors observed between Er 3+ , Ho 3+ and Nd 3+ definitely need a deeper investigation, but we could reasonably ascribe the observed fast signal components to surface ions. While for Ho 3+ the contribution of highly quenched surface ions is less than 10% of the total, in the case of Nd 3+ the noticeable shortening of the lifetime can be related to the high dopant loading (4.93%) leading to a relevant amount of surface ions.…”

Section: Resultsmentioning

confidence: 89%

Switching on Near-Infrared Light in Lanthanide-doped CsPbCl3 Perovskite Nanocrystals.pdf

Zeng¹,

Locardi

Mara³

et al. 2020

Preprint

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The accessible emission spectral range of lead halide perovskite (LHP) CsPbX3 (X = Cl−, Br−, I−) nanocrystals (NCs) has remained so far limited to wavelengths below 1 μm, corresponding to the emission line of Yb3+, whereas the direct sensitization of other near-infrared (NIR) emitting lanthanide ions is unviable. Herein, we present a general strategy to enable intense NIR emission from Er3+ at ~1.5 μm, Ho3+ at ~1.0 μm and Nd3+ at ~1.06 μm through a Mn2+-mediated energy-transfer pathway. Steady-state and time-resolved photoluminescence studies show that energy-transfer efficiencies of about 39%, 35% and 70% from Mn2+ to Er3+, Ho3+ and Nd3+ are obtained, leading to photoluminescence quantum yields of ~0.8%, ~0.7% and ~3%, respectively. This work provides guidance on constructing energy-transfer pathways in semiconductors and opens new perspectives for the development of lanthanide-functionalized LHPs as promising materials for optoelectronic devices operating in the NIR region.

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Luminescence studies on Er3+ -doped zincfluorophosphate glasses for 1.53 μm laser applications

Cited by 49 publications

References 50 publications

Impact of Ag2O Content on the Optical and Spectroscopic Properties of Fluoro-Phosphate Glasses

Impact of Ag2O Content on the Optical and Spectroscopic Properties of Fluoro-Phosphate Glasses

Synthesis, characterization and optical spectroscopy of GdPO₄:Er³⁺

Switching on Near-Infrared Light in Lanthanide-doped CsPbCl3 Perovskite Nanocrystals.pdf

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Luminescence studies on Er3+ -doped zincfluorophosphate glasses for 1.53 μm laser applications

Cited by 49 publications

References 50 publications

Impact of Ag2O Content on the Optical and Spectroscopic Properties of Fluoro-Phosphate Glasses

Impact of Ag2O Content on the Optical and Spectroscopic Properties of Fluoro-Phosphate Glasses

Synthesis, characterization and optical spectroscopy of GdPO4:Er3+

Switching on Near-Infrared Light in Lanthanide-doped CsPbCl3 Perovskite Nanocrystals.pdf

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Synthesis, characterization and optical spectroscopy of GdPO₄:Er³⁺