Physical and optical properties of Dy 3+ /Pr 3+ Co-doped lithium borate glasses for W-LED

Pawar, Pravina P.; Munishwar, S.R.; Gedam, R.S.

doi:10.1016/j.jallcom.2015.11.087

Cited by 194 publications

(48 citation statements)

References 38 publications

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“…The bands occurring in the spectral range 1350-1371 cm -1 are attributed to the B-O stretching vibration in BO 3 units. These bands are similar reported by Pawar et al [20]. Finally, the absorption bands located around 2872-2880 cm -1 and 2940-2960 cm -1 are due to the characteristic of the hydrogen bond in the glass samples [21].…”

Section: Structural Propertiessupporting

confidence: 89%

Effect of Silver on the Physical and Structural Properties of Lead Neodymium Borotellurite Glass System

2018

MJAS

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Neodymium doped borotellurite glass is well known to be one of the most promising candidate due to it various applications. Nd 3+ doped lead borotellurite glasses containing silver were successfully been prepared by conventional melt-quenching method with the chemical composition (69.5-x)TeO 2 -20B 2 O 3 -10PbO-0.5Nd 2 O 3 -xAgNO 3 (where x = 0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol %). The physical properties such as density, molar volume and oxygen packing density were measured. Their structural properties of the glass system were studied via X-Ray Diffraction (XRD) analysis and Fourier Transform Infrared (FTIR) spectroscopy. From the result, the amorphous nature of the prepared glass samples have been confirmed through X-ray diffraction spectral analysis. The presence of Te-O-Te or O-Te-O, Ag-O, Te-O-Pb and B-O and characteristic of the hydrogen bond in the prepared glasses were explored through the FTIR spectral studies recorded in the 400-4000 cm -1 wave number range at room temperature. Meanwhile, the results of physical properties are found to vary with respect to concentration of AgNO 3 content. Some other results will be reported and discussed.Keywords: neodymium, borotellurite, silver, physical properties, structural properties Abstrak Kaca borotelurit di dop neodimium merupakan salah satu bahan yang diyakini disebabkan oleh kepelbagaian aplikasinya. Kaca borotelurit di dop Nd 3+ mengandungi perak telah berjaya disediakan dengan kaedah konvensional sepuh lindap dengan komposisi kimia (69.5-x)TeO 2 -20B 2 O 3 -10PbO-0.5Nd 2 O 3 -xAgNO 3 (di mana x = 0, 0.5, 1.0, 1.5, 2.0 dan 2.5 mol%). Sifat-sifat fizikal seperti ketumpatan, isipadu molar dan ketumpatan padat oksigen telah diukur. Sifat-sifat struktur sistem kaca ini telah dikaji melalui analisis pembelauan sinar-X (XRD) dan spektroskopi inframerah transformasi Fourier (FTIR). Dari hasil kajian, sifat semulajadi amorfus sampel kaca yang disediakan telah disahkan melalui analisis spektra pembelauan sinar-X. Kehadiran Te-O-Te atau O-Te-O, Ag-O, Te-O-Pb, B-O dan ciri-ciri ikatan hidrogen dalam kaca yang disediakan telah diterokai melalui kajian spektra FTIR yang direkodkan dalam julat gelombang 400-4000 cm -1 pada suhu bilik. Sementara itu, hasil kajian bagi sifat fizikal didapati berubah mengikut kepekatan kandungan AgNO 3 . Beberapa keputusan lain akan dilaporkan dan dibincangkan.

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Section: Structural Propertiessupporting

confidence: 89%

Effect of Silver on the Physical and Structural Properties of Lead Neodymium Borotellurite Glass System

2018

MJAS

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“…At about the same region a band due to stretching vibrations of P = O was also predicted. A conventional band due to symmetric stretching vibrations of PO 4 3À units was observed at about 1090 cm…”

Section: Resultsmentioning

confidence: 99%

“…This fact accounts for the ability of PbO to form glasses up to 90 mol%. Lead ions participate in the glass network with distorted PbO 3 and PbO 4 pyramids depending upon the concentration of lead oxide and influence the emission characteristics of dopant Dy 3+ ions to a large extent. Furthermore, several earlier nuclear magnetic resonance (NMR) studies on glasses containing lead oxide have indicated that Pb ions exist in Pb + and Pb 3+ states in addition to the normal Pb 2+ state (9-11).…”

Section: +mentioning

confidence: 99%

Concentration dependence of luminescence efficiency of Dy³⁺ ions in strontium zinc phosphate glasses mixed with Pb₃O₄

2016

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In this work we synthesized SrO-ZnO-P O glasses mixed with Pb O (heavy metal oxide) and doped with different amounts of Dy O (0.1 to 1.0 mol%). Subsequently their emission and decay characteristics were investigated as a function of Dy O concentration. The emission spectra exhibited three principal emission bands in the visible region corresponding to F → H (482 nm), H (574 nm) and H (663 nm) transitions. With increase in the concentration of Dy O (upto 0.8 mol%) a considerable increase in the intensity of these bands was observed and, for further increase, quenching of photoluminescence (PL) output was observed. Using emission spectra, various radiative parameters were evaluated and all these parameters were found to increase with increase in Dy O concentration. The Y/B integral emission intensity ratio of Dy ions evaluated from these spectra exhibited a decreasing trend with increase in the Dy O concentration up to 0.8 mol%. Quenching of luminescence observed in the case of the glasses doped with 1.0 mol% is attributed to clustering of Dy ions. The quantitative analysis of these results together with infra-red (IR) spectral studies indicated that 0.8 mol% is the optimum concentration of Dy ions needed to achieve maximum luminescence efficiency. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Up to date, the W‐LED is generally fabricated by coating a blue or ultraviolet (UV) LED chip with phosphors . In this case, W‐LED has a deterioration of the epoxy resin used to encapsulate the LED chip caused by the temperature rise of the working device . Besides, the phosphors coating homogeneity is difficult to control .…”

Section: Introductionmentioning

confidence: 99%

Near white light emission of Ce³⁺‐, Ho³⁺‐, and Sm³⁺‐doped oxyfluoride silicate glasses

2017

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The Ce3+‐, Ho3+‐, and Sm3+‐ single and co‐doped oxyfluoride silicate glasses for light emitting diodes are studied. These glasses were prepared by melt quenching method and their optical and structural properties were investigated by absorption spectra, photoluminescence spectra, Commission International de I'Eclairage chromaticity coordinates, X‐ray diffraction, and Fourier transform infrared spectra. It is found that the introduction of Al2O3 in glass composition can improve the emissions of Ho3+ and Sm3+. While the presence of B2O3 has the adverse effect and can suppress the emissions of Ho3+ and Sm3+. With substituting Na2O for CaO in the glass compositions, CaF2 crystals can be formed during the melt quenching process. We find the formation of CaF2 crystals can change the emission behavior of Ho3+ and Sm3+ ions. White light emissions can be achieved in the glasses and the luminescence colors can be tuned by varying the concentrations of the doped rare‐earth ions and the composition of glass matrix. The Ce3+‐, Ho3+‐, and Sm3+‐doped oxyfluoride silicate glasses presented here demonstrate promising applications in the fields of light emitting diodes.

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Physical and optical properties of Dy 3+ /Pr 3+ Co-doped lithium borate glasses for W-LED

Cited by 194 publications

References 38 publications

Effect of Silver on the Physical and Structural Properties of Lead Neodymium Borotellurite Glass System

Effect of Silver on the Physical and Structural Properties of Lead Neodymium Borotellurite Glass System

Concentration dependence of luminescence efficiency of Dy³⁺ ions in strontium zinc phosphate glasses mixed with Pb₃O₄

Near white light emission of Ce³⁺‐, Ho³⁺‐, and Sm³⁺‐doped oxyfluoride silicate glasses

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Physical and optical properties of Dy 3+ /Pr 3+ Co-doped lithium borate glasses for W-LED

Cited by 194 publications

References 38 publications

Effect of Silver on the Physical and Structural Properties of Lead Neodymium Borotellurite Glass System

Effect of Silver on the Physical and Structural Properties of Lead Neodymium Borotellurite Glass System

Concentration dependence of luminescence efficiency of Dy3+ ions in strontium zinc phosphate glasses mixed with Pb3O4

Near white light emission of Ce3+‐, Ho3+‐, and Sm3+‐doped oxyfluoride silicate glasses

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Concentration dependence of luminescence efficiency of Dy³⁺ ions in strontium zinc phosphate glasses mixed with Pb₃O₄

Near white light emission of Ce³⁺‐, Ho³⁺‐, and Sm³⁺‐doped oxyfluoride silicate glasses