The Experts below are selected from a list of 42 Experts worldwide ranked by ideXlab platform
S J Dhoble - One of the best experts on this subject based on the ideXlab platform.
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uvb emitting lisrbo3 phosphor for Phototherapy Lamp
AIP Conference Proceedings, 2018Co-Authors: R G Kunghatkar, P S Hemne, S J DhobleAbstract:LiSrBO3 doped Gadolinium have been synthesized by sol gel technique. The formation of host was confirmed by XRD techniques. The incorporation of Gd3+ was confirmed by photoluminescence (PL) characterization. The UVB emission is observed at 316 nm when UV excited by 274 nm. The second order emission are also observed in PL emission spectra at 612 nm and 627 nm. Energy band gap is found to be 5.81 eV by using Kubelka - Munk function. The UVB emission at 316 nm of Gd3+ doped materials are used as Phototherapy Lamp phosphor.LiSrBO3 doped Gadolinium have been synthesized by sol gel technique. The formation of host was confirmed by XRD techniques. The incorporation of Gd3+ was confirmed by photoluminescence (PL) characterization. The UVB emission is observed at 316 nm when UV excited by 274 nm. The second order emission are also observed in PL emission spectra at 612 nm and 627 nm. Energy band gap is found to be 5.81 eV by using Kubelka - Munk function. The UVB emission at 316 nm of Gd3+ doped materials are used as Phototherapy Lamp phosphor.
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new uva emitting baalbo3f2 eu2 phosphor with pl and tl properties for Phototherapy Lamp
Luminescence, 2016Co-Authors: R G Kunghatkar, S J Dhoble, P S HemneAbstract:We present a new phosphor material, BaAlBO3 F2 doped with Eu2+ ions, having emission in the UVA region. The phosphor material is prepared by a simple wet chemical method. Phase confirmation was carried out using the Rietveld refinement program which shows that BaAlBO3 F2 :Eu2+ has an hexagonal crystal system. Using a Fourier transform infrared spectroscopy graph, we studied the bond stretching present in the phosphor material. Photoluminescence (PL) characterization, carried out using a RF spectrofluorophotometer, shows two types of PL excitation and emission. Before reduction, emission is in the blue region at 431 nm; after reduction, excitation is at 258 nm and emission is at 361 nm, which is in the UVA region. Some thermoluminescence (TL) studies were carried out in this material for the first time, for example, determination of the trapping parameters, linearity, fading, glow curve convolution and deconvolution (GCCD) function for curve fitting and the Tm -Tstop method for confirmation of the trapped centers in the TL glow peak. Copyright © 2016 John Wiley & Sons, Ltd.
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uvb emitting gd 3 activated m2o2s where m la y for Phototherapy Lamp phosphors
Luminescence, 2015Co-Authors: V V Shinde, R G Kunghatkar, S J DhobleAbstract:Gd(3+)-activated oxysulphide (M2O2S) may be used to study Photoluminescence (PL) properties with respect to Phototherapy. Gd(3+)-activated phosphor materials are widely used for Phototherapy Lamps. The Gd(3+) ion gives characteristic Narrow-Band (NB) emissions, in particular in the ultraviolet (UV) light region, that are used to treat more than 50 types of skin diseases. In this paper, M2O2S oxysulphide doped with Gd(3+) was synthesized by the solid-state flux fusion method and its down conversion spectral properties were studied as a function of different Gd(3+) concentrations. The sample was characterized by X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), and PL and the crystal structure was also studied. The lanthanum oxysulphide (La2O2S)-activated Gd(3+) ion showed a sharp emission peak at 314 nm when excited at 275 nm excitation, whereas the yttrium oxysulphide (Y2O2S)-activated Gd(3+) ion showed a sharp emission at 316 nm when excited by 272 nm. The effect of concentration of the Gd(3+) ion on the luminescence properties of M2O2S:Gd(3+) phosphor was also studied. These phosphor materials activated with the Gd(3+) ion may be suitable for Phototherapy Lamps, which are used to treat many types of skin diseases such as psoriasis, vitiligo, or scleroderma.
S K Omanwar - One of the best experts on this subject based on the ideXlab platform.
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narrow band uvb emitting phosphor lapo4 gd3 for Phototherapy Lamp
Optik, 2016Co-Authors: A O Chauhan, A B Gawande, S K OmanwarAbstract:Abstract Gd3+ activated inorganic lanthanum phosphate (LaPO4) has been successfully synthesized using re-crystallization method. The crystal structure and the phase purity of samples were characterized using powder X-ray diffractometer. The surface morphology was studied using Scanning Electronic Microscope (SEM). The photoluminescence spectra was studied at room temperature. The excitation spectra of Gd3+ activated phosphor LaPO4 monitored at 312 nm shows strong absorption at 275 nm. Phosphor emitted at 312 under the excitation of 275 nm due to 6PJ → 8S7/2 transition of Gd3+ ions. Optimum concentration of Gd3+ ions in the prepared phosphor was found to be 0.04 mol. For this concentration the critical distance R0 was calculated to be 15.37 A. Finally, the Stokes shift for the synthesized phosphor LaPO4: Gd3+ was calculated to be 4312 cm−1.
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a novel gd 3 pb 2 doped lisrpo 4 phosphor for Phototherapy Lamp applications
Journal of Inorganic and Organometallic Polymers and Materials, 2016Co-Authors: A O Chauhan, A B Gawande, S K OmanwarAbstract:The phosphors LiSrPO4:Gd3+ and LiSrPO4:Gd3+, Pb2+ with different concentration of Gd3+ and Pb2+ were synthesized by combination of re-crystallization and modified solid state diffusion method. The synthesized phosphors were characterized using XRD, SEM and PL spectroscopies. The PL excitation spectra of LiSrPO4:Gd3+ phosphor exhibit peak at 275 nm due to the 8S7/2 →4IJ transition of Gd3+ ions and gave narrow UVB emission at 312 nm. The effect of Pb2+ ions on the PL properties of LiSrPO4:Gd3+have also been investigated. Upon the addition of Pb2+ ions, the excitation of phosphors shows broad peak with maximum at 247 nm, overlapping the Hg 253.7 nm line. This addition of Pb2+ ions improved the emission intensity of narrow band UVB i.e. 312 nm under the excitation of 247 nm. The phosphor could be good candidate as Phototherapy Lamp phosphor material.
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on the application of caf2 eu and srf2 eu phosphors in led based Phototherapy Lamp
PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013, 2013Co-Authors: P D Belsare, S V Moharil, C P Joshi, S K OmanwarAbstract:In the last few years the interest of scientific community has been increased towards solid state lighting based on LEDs because of their superior advantages over the conventional fluorescent Lamps. As the GaN based LEDs are easily available efforts of the researchers are now on making the new phosphors which are excitable in the near UV region (360-400nm) for solid state lighting. This paper reports the photoluminescence characteristics of CaF2:Eu and SrF2:Eu phosphor prepared by wet chemical method. The violet emission of these phosphors with near UV excitation can be useful in making a Phototherapy Lamp based on LEDs for treating various skin diseases like acne vulgaris and hyperbilirubinemia.
R G Kunghatkar - One of the best experts on this subject based on the ideXlab platform.
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uvb emitting lisrbo3 phosphor for Phototherapy Lamp
AIP Conference Proceedings, 2018Co-Authors: R G Kunghatkar, P S Hemne, S J DhobleAbstract:LiSrBO3 doped Gadolinium have been synthesized by sol gel technique. The formation of host was confirmed by XRD techniques. The incorporation of Gd3+ was confirmed by photoluminescence (PL) characterization. The UVB emission is observed at 316 nm when UV excited by 274 nm. The second order emission are also observed in PL emission spectra at 612 nm and 627 nm. Energy band gap is found to be 5.81 eV by using Kubelka - Munk function. The UVB emission at 316 nm of Gd3+ doped materials are used as Phototherapy Lamp phosphor.LiSrBO3 doped Gadolinium have been synthesized by sol gel technique. The formation of host was confirmed by XRD techniques. The incorporation of Gd3+ was confirmed by photoluminescence (PL) characterization. The UVB emission is observed at 316 nm when UV excited by 274 nm. The second order emission are also observed in PL emission spectra at 612 nm and 627 nm. Energy band gap is found to be 5.81 eV by using Kubelka - Munk function. The UVB emission at 316 nm of Gd3+ doped materials are used as Phototherapy Lamp phosphor.
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new uva emitting baalbo3f2 eu2 phosphor with pl and tl properties for Phototherapy Lamp
Luminescence, 2016Co-Authors: R G Kunghatkar, S J Dhoble, P S HemneAbstract:We present a new phosphor material, BaAlBO3 F2 doped with Eu2+ ions, having emission in the UVA region. The phosphor material is prepared by a simple wet chemical method. Phase confirmation was carried out using the Rietveld refinement program which shows that BaAlBO3 F2 :Eu2+ has an hexagonal crystal system. Using a Fourier transform infrared spectroscopy graph, we studied the bond stretching present in the phosphor material. Photoluminescence (PL) characterization, carried out using a RF spectrofluorophotometer, shows two types of PL excitation and emission. Before reduction, emission is in the blue region at 431 nm; after reduction, excitation is at 258 nm and emission is at 361 nm, which is in the UVA region. Some thermoluminescence (TL) studies were carried out in this material for the first time, for example, determination of the trapping parameters, linearity, fading, glow curve convolution and deconvolution (GCCD) function for curve fitting and the Tm -Tstop method for confirmation of the trapped centers in the TL glow peak. Copyright © 2016 John Wiley & Sons, Ltd.
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uvb emitting gd 3 activated m2o2s where m la y for Phototherapy Lamp phosphors
Luminescence, 2015Co-Authors: V V Shinde, R G Kunghatkar, S J DhobleAbstract:Gd(3+)-activated oxysulphide (M2O2S) may be used to study Photoluminescence (PL) properties with respect to Phototherapy. Gd(3+)-activated phosphor materials are widely used for Phototherapy Lamps. The Gd(3+) ion gives characteristic Narrow-Band (NB) emissions, in particular in the ultraviolet (UV) light region, that are used to treat more than 50 types of skin diseases. In this paper, M2O2S oxysulphide doped with Gd(3+) was synthesized by the solid-state flux fusion method and its down conversion spectral properties were studied as a function of different Gd(3+) concentrations. The sample was characterized by X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), and PL and the crystal structure was also studied. The lanthanum oxysulphide (La2O2S)-activated Gd(3+) ion showed a sharp emission peak at 314 nm when excited at 275 nm excitation, whereas the yttrium oxysulphide (Y2O2S)-activated Gd(3+) ion showed a sharp emission at 316 nm when excited by 272 nm. The effect of concentration of the Gd(3+) ion on the luminescence properties of M2O2S:Gd(3+) phosphor was also studied. These phosphor materials activated with the Gd(3+) ion may be suitable for Phototherapy Lamps, which are used to treat many types of skin diseases such as psoriasis, vitiligo, or scleroderma.
Douglas Mcg Clarkson - One of the best experts on this subject based on the ideXlab platform.
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Use of a hand-held spectroradiometer for the measurement of neonatal Phototherapy Lamp outputs.
Medical Engineering & Physics, 2019Co-Authors: Douglas Mcg Clarkson, Prakash SatodiaAbstract:Abstract The measurement capability of a hand-held spectroradiometer for validation of Phototherapy light treatment for neonates is described. This function is compared with that of a double grating monochromator system with photomultiplier detector, where parameters evaluated included wavelength accuracy and accuracy of irradiance within set wavelength intervals – 460 nm to 490 nm and 400 nm to 550 nm. Measurements carried out in a clinical setting revealed that the hand-held spectroradiometer provided an acceptable level of accuracy for determining output characteristics of the Phototherapy devices investigated. It was observed that measurement errors were more significant for studies involving direct contact with light emitting surfaces. It was identified that the spectral resolution of the MSC15 device could act to degrade the accuracy of the device where narrow spectrum peaks occurred around the limits of specific identified bandwidths – such as at 460 nm and 490 nm. This was identified not to be an issue with typical light emitting diode Phototherapy systems, where the spectral outputs do not contain narrow spectral components. The device lends itself also to use by clinical staff in the clinical environment to verify the output of Phototherapy Lamps. The availability of such hand-held spectroradiometer devices represents an advance on the use of output meters suppled by equipment manufacturers.
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safety of neonatal Phototherapy Lamp exposure
Journal of Radiological Protection, 2016Co-Authors: Douglas Mcg Clarkson, Prakash Satodia, Ian HadleyAbstract:A routine review of light exposure within a neonatal intensive care unit is described following the introduction of a new model of neonatal Phototherapy Lamp. Spectral measurements were undertaken using a Bentham Dmc150 spectroradiometer system. Safety assessments were undertaken based on likely exposure of parents at the cot side, neonates in adjacent cots and the effectiveness of eye protection for neonates with direct Phototherapy. An aphakic eye response was used for assessment of neonatal risk and the blue-light response for estimation of adult exposure using current ICNIRP guidelines. Such estimations indicated exposure levels of parents at the cot side and neonates in adjacent cots were within current established safe limits. The level of light blocking provided by the available neonatal eye protection was estimated to be entirely adequate and presented no hazard to the infant when correctly positioned over the neonate. It is likely, however, that an increased safety factor is potentially present for the neonate due to the fact that the neonate's eyes will typically be shut for over 50% of the time. It is identified, however, that the aphakic response is essentially associated with mature adult retinal cells, and that the maturing cells of the neonate may exhibit additional light sensitivity, especially in the case of premature infants. Changes in neonatal physiology associated with neonatal Phototherapy are discussed, which may influence mechanisms of light-induced retinal damage.
Prakash Satodia - One of the best experts on this subject based on the ideXlab platform.
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Use of a hand-held spectroradiometer for the measurement of neonatal Phototherapy Lamp outputs.
Medical Engineering & Physics, 2019Co-Authors: Douglas Mcg Clarkson, Prakash SatodiaAbstract:Abstract The measurement capability of a hand-held spectroradiometer for validation of Phototherapy light treatment for neonates is described. This function is compared with that of a double grating monochromator system with photomultiplier detector, where parameters evaluated included wavelength accuracy and accuracy of irradiance within set wavelength intervals – 460 nm to 490 nm and 400 nm to 550 nm. Measurements carried out in a clinical setting revealed that the hand-held spectroradiometer provided an acceptable level of accuracy for determining output characteristics of the Phototherapy devices investigated. It was observed that measurement errors were more significant for studies involving direct contact with light emitting surfaces. It was identified that the spectral resolution of the MSC15 device could act to degrade the accuracy of the device where narrow spectrum peaks occurred around the limits of specific identified bandwidths – such as at 460 nm and 490 nm. This was identified not to be an issue with typical light emitting diode Phototherapy systems, where the spectral outputs do not contain narrow spectral components. The device lends itself also to use by clinical staff in the clinical environment to verify the output of Phototherapy Lamps. The availability of such hand-held spectroradiometer devices represents an advance on the use of output meters suppled by equipment manufacturers.
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safety of neonatal Phototherapy Lamp exposure
Journal of Radiological Protection, 2016Co-Authors: Douglas Mcg Clarkson, Prakash Satodia, Ian HadleyAbstract:A routine review of light exposure within a neonatal intensive care unit is described following the introduction of a new model of neonatal Phototherapy Lamp. Spectral measurements were undertaken using a Bentham Dmc150 spectroradiometer system. Safety assessments were undertaken based on likely exposure of parents at the cot side, neonates in adjacent cots and the effectiveness of eye protection for neonates with direct Phototherapy. An aphakic eye response was used for assessment of neonatal risk and the blue-light response for estimation of adult exposure using current ICNIRP guidelines. Such estimations indicated exposure levels of parents at the cot side and neonates in adjacent cots were within current established safe limits. The level of light blocking provided by the available neonatal eye protection was estimated to be entirely adequate and presented no hazard to the infant when correctly positioned over the neonate. It is likely, however, that an increased safety factor is potentially present for the neonate due to the fact that the neonate's eyes will typically be shut for over 50% of the time. It is identified, however, that the aphakic response is essentially associated with mature adult retinal cells, and that the maturing cells of the neonate may exhibit additional light sensitivity, especially in the case of premature infants. Changes in neonatal physiology associated with neonatal Phototherapy are discussed, which may influence mechanisms of light-induced retinal damage.