Spectroscopic properties of highly Nd-doped lead phosphate glass

Novais, A.L.F.; Dantas, Noélio O.; Guedes, I.; Vermelho, M. V. D.

doi:10.1016/j.jallcom.2015.06.148

Cited by 36 publications

(12 citation statements)

References 29 publications

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“…The Ω 2 value successively increases with a decrease in the P/Al ratio. It suggests the presence of a less centrosymmetric coordination environment and a greater extent of covalent bonding around the Nd 3+ ion . As discussed above, the 27 Al ions present in the higher‐order Nd 3+ coordination sphere successively increases with a decrease in the P/Al ratio.…”

Section: Judd–ofelt Parameters (ω2 ω4 and ω6) And Emission Cross Sementioning

confidence: 84%

Rare‐Earth Ion Local Environments in Nd:Al₂O₃‐P₂O₅‐K₂O Glass Studied by Electron Paramagnetic Resonance Spectroscopies

Shao

Wang

et al. 2018

Physica Rapid Research Ltrs

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The rare-earth local environments of Nd:Al 2 O 3 -P 2 O 5 -K 2 O glass with different P/Al ratios are analyzed using electron paramagnetic resonance (EPR). The echo-detected field sweep (EDFS) line-shape change hints at a modification of the local environment around Nd 3þ ion by various P/Al ratios. The coordination sphere structure of Nd 3þ ion is determined by three and four pulse electron spin echo envelope modulation (ESEEM) spectra. The off-diagonal signal corresponding to 31 P Larmor frequency confirms that the second-order coordination sphere of Nd 3þ ion is almost occupied by P atoms. Al is located at the higher-order Nd 3þ coordination sphere as only diagonal resonance corresponding to the 27 Al was detected, the content of which rapidly increases with decreasing P/Al ratio.Nd-doped phosphate glasses, such as LHG-8, LG760, and N31, have been used in laser confinement fusion facilities. [1,2] Using Nd-doped glass amplifiers, high-intensity ultra-fast lasers have been developed, which are important tools to realize inertial confinement fusion. [3] However, the narrow gain bandwidth of commercially available neodymium glasses hinders further improvement of laser output. Introducing Al 2 O 3 into Nd-doped phosphate glass broadens the effective line-width (Δλ eff ). [4] The Nd 3þ luminescence is greatly influenced by its glass structure and the local environment of Nd 3þ ion. The glass structure of aluminophosphate glass has been investigated by NMR, IR and Raman. [5] The local environment of Nd 3þ ion can be examined by EPR.In aluminophosphate fluoride systems, 27 Al and 31 P signals have been observed under the weak coupling condition. [6,7] However, the distribution of P and Al around the RE ion in aluminophosphate glass is still unclear, especially when the content of P is far greater than that of Al.In this work, we apply EPR technique to characterize of Nd: Al 2 O 3 -P 2 O 5 -K 2 O glasses. The P/Al ratios were set to 11, 5, and 3 in order to examine the effect of the P/Al ratio on the Nd 3þ ion local environments. In addition, the luminescence properties have been correlated to the Nd 3þ ion local environment. On the basis of the experiments mentioned above, we demonstrated that the second-order coordination sphere of Nd 3þ ion is almost occupied by P atoms. Al is located at the higherorder Nd 3þ coordination spheres, the content of which rapidly increases with decreasing P/Al ratio.Experiment Details: xAl 2 O 3 -(60Àx)P 2 O 5 -40K 2 O-0.5Nd 2 O 3 (x ¼ 5, 10, 15) were prepared by the conventional melting procedure. The samples are named PA11, PA5 and PA3 according to their respective P/Al ratios. Stoichiometric amounts of Al(PO 3 ) 3 , Al 2 O 3 , KPO 3 , P 2 O 5 , and Nd 2 O 3 .were mixed. Mixtures were melted in a quartz crucible for 30 min at 900-1400 C, depending on the components. The melts were cast into preheated steel molds and annealed at the corresponding transition temperature in a muffle furnace.All of the solid-state EPR experiments were carried out on an E-580 BRUKER ELEXIS X-band EPR spec...

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Section: Judd–ofelt Parameters (ω2 ω4 and ω6) And Emission Cross Sementioning

confidence: 84%

Rare‐Earth Ion Local Environments in Nd:Al₂O₃‐P₂O₅‐K₂O Glass Studied by Electron Paramagnetic Resonance Spectroscopies

Shao

Wang

et al. 2018

Physica Rapid Research Ltrs

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“…The bandwidth of commercial Nd 3+ ‐doped phosphate glass is only ~30 nm. Though great efforts have been made to improve their optical performance, the problem of narrow photoluminescence still limits the realization of new laser region and other applications . For example, in ultrahigh‐peak‐power field, the narrow bandwidth of Nd 3+ inevitably hinders the reducing of pulse duration and limits the further increase of pulse peak power toward Exawatt (EW) level due to the limitation of Gaussian‐shape pulse where the product of pulse duration and bandwidth approximately equals to 0.5 .…”

Section: Introductionmentioning

confidence: 99%

“…Considering the advantages and mature large‐size continuous melting technology of phosphate glasses, scientists have made many attempts to achieve broad NIR emission and excellent radiative properties of Nd 3+ in new phosphate glass systems. For example, codoping heavy metal oxide (HMO), such as PbO and CdO, has been proposed to effectively improve the radiative transition properties of Nd 3+ , including stimulated cross‐section and radiation transition probability . However, PbO and CdO are highly toxic and environmentally unfriendly.…”

Section: Introductionmentioning

confidence: 99%

Mechanism for broadening and enhancing Nd³⁺ emission in zinc aluminophosphate laser glass by addition of Bi₂O₃

Wang

Cao

et al. 2018

J Am Ceram Soc

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Nd3+‐doped phosphate laser glasses have been attracting much attention and widespread investigation due to their high solubility of rare earth (RE) ions, excellent spectroscopic properties, and large damage threshold. However, the narrow NIR emission bandwidth (less than 30 nm) of these Nd3+‐doped phosphate glasses limits their further application toward ultrahigh power field and efficient fiber laser in new region. Here, we demonstrate the broadening and enhancing of Nd3+ NIR emission in laser glass of zinc aluminophosphate through tuning the glass structure and covalency of Nd‐O bond without limiting the radiative properties of Nd3+. The maximum bandwidth of 1.05 μm emission is broadened to 50 nm, which is comparable to that of Nd3+‐doped aluminate laser glasses. Simultaneously, the lifetime of 4F3/2 level is elongated nearly by two times. Structural and optical properties of prepared glasses were discussed systematically to reveal the mechanism. Detailed analysis on optical spectra and glass structure indicates that the bandwidth is affected by not only the covalency of Nd‐O but also the compactness of glass structure. Our results could enrich our understanding about the relationship between local glass structure and luminescence behaviors of active centers, and may be helpful in designing new RE‐doped laser glass systems.

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“…Phosphate glasses are good candidates for technological and optical applications due to their intrinsic characteristics, such as low melting point (T m ), viscosity and glass transition temperatures (T g ), large thermal stability against crystallization, broad transparency from ultraviolet to infrared region, and higher thermal expansion coefficient when compared with silicate glasses [10][11][12] Surface-enhanced Raman spectroscopy (SERS) is a highly sensitive technique for trace analysis (concentrations from 10 −5 to 10 -7 M) [13][14][15][16] and is based mainly on the LSPR effect. The SERS spectrum of the target analyte is amplified through the excitation of the LSPR of the substrate containing dispersed metallic NP or a nanostructured metal film.…”

Section: Introductionmentioning

confidence: 99%

A new SERS substrate based on niobium lead-pyrophosphate glasses obtained by Ag+/Na+ ion exchange

Manzani

Franco

Afonso

et al. 2018

Sensors and Actuators B: Chemical

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Surface-enhanced Raman scattering (SERS) is one of the most sensitive methods for the detection of adsorbed molecules on the nanostructured coinage-metal surface. The enhancements in the order of 10 4-10 6 are routinely observed. Such an effect makes SERS spectroscopy a technique applicable to the study the adsorption of analytes in the submonolayer regime. Novel SERS sensors require novel substrates with high activity for great sensibility detection of different molecules applied in many fields, such as detections of narcotics, explosives, and molecules with biological interest. In this work, silver nanoparticles embedded in niobium lead-pyrophosphate glasses (Pb 2 P 2 O 7-Nb 2 O 5-Na 2 O) were prepared by ion exchange process, where silver ions were introduced into glass surface by Ag + /Na + ion exchange (NaNO 3 :AgNO 3 batch), and reduced to metallic silver by heat treatment at glass transition temperature (ca. 480°C). The new substrate was characterized by Raman spectroscopy, optical absorption, transmission electron microscopy (TEM) and atomic force microscopy (AFM). Its application in SERS was demonstrated by studying the adsorption of 2,2-bipyridine (bpy) on the glass surface, which has marker bands for the coordination of the adsorbate with silver atoms. The optimal surface features in terms of SERS enhancement were also discussed and the sensing ability of this new substrate was demonstrated.

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Spectroscopic properties of highly Nd-doped lead phosphate glass

Cited by 36 publications

References 29 publications

Rare‐Earth Ion Local Environments in Nd:Al₂O₃‐P₂O₅‐K₂O Glass Studied by Electron Paramagnetic Resonance Spectroscopies

Rare‐Earth Ion Local Environments in Nd:Al₂O₃‐P₂O₅‐K₂O Glass Studied by Electron Paramagnetic Resonance Spectroscopies

Mechanism for broadening and enhancing Nd³⁺ emission in zinc aluminophosphate laser glass by addition of Bi₂O₃

A new SERS substrate based on niobium lead-pyrophosphate glasses obtained by Ag+/Na+ ion exchange

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Spectroscopic properties of highly Nd-doped lead phosphate glass

Cited by 36 publications

References 29 publications

Rare‐Earth Ion Local Environments in Nd:Al2O3‐P2O5‐K2O Glass Studied by Electron Paramagnetic Resonance Spectroscopies

Rare‐Earth Ion Local Environments in Nd:Al2O3‐P2O5‐K2O Glass Studied by Electron Paramagnetic Resonance Spectroscopies

Mechanism for broadening and enhancing Nd3+ emission in zinc aluminophosphate laser glass by addition of Bi2O3

A new SERS substrate based on niobium lead-pyrophosphate glasses obtained by Ag+/Na+ ion exchange

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Rare‐Earth Ion Local Environments in Nd:Al₂O₃‐P₂O₅‐K₂O Glass Studied by Electron Paramagnetic Resonance Spectroscopies

Rare‐Earth Ion Local Environments in Nd:Al₂O₃‐P₂O₅‐K₂O Glass Studied by Electron Paramagnetic Resonance Spectroscopies

Mechanism for broadening and enhancing Nd³⁺ emission in zinc aluminophosphate laser glass by addition of Bi₂O₃