kaushal Jha - Academia.edu (original) (raw)
Papers by kaushal Jha
To investigate how central metal tunes the synergetic interactions between substituted metallo-ph... more To investigate how central metal tunes the synergetic interactions between substituted metallo-phthalocyanine and single-walled carbon nanotubes in enhancing the gas sensing properties, a comparative study has been performed by varying the central metal ion in fluorinated metal phthalocyanines and single-walled carbon nanotube hybrid. Hybrids of metal(ii)-1,2,3,4,8,9,10,11,15,16,17,18-24,25-hexa-decafluoro-29H,31H-phthalocyanine/single-walled carbon nanotube (F16MPc/SWCNTs-COOH, where M = Co, Zn) have been synthesized through - stacking interactions using the solution route. Spectroscopic (FT-IR, UV-vis, XPS and Raman), electron microscopic (TEM and FE-SEM) and TGA investigations have confirmed the successful functionalization and interaction of SWCNTs-COOH with F16MPc. Parts per billion (ppb) level Cl-2-selective chemiresistive gas sensors have been fabricated on glass substrates with precoated gold electrodes by using these hybrids. The responses of various F16MPc/SWCNTs-COOH sensors have demonstrated the central metal ion-dependence in the sensitivity of Cl-2.
Journal of the Korean Physical Society, 2018
In this work, a silicate based phosphor doped with divalent and trivalent europium (Eu (2+/3+)) i... more In this work, a silicate based phosphor doped with divalent and trivalent europium (Eu (2+/3+)) ions have been synthesized by two different synthesis processes, PGMS (propylene glycol modified silane) assisted sol-gel and solid state reaction (SSR) method. The structural, morphological and optical properties were studied in detail. The emission intensity of Li2SrSiO4:Eu 3+ phosphors synthesized through the PGMS assisted sol-gel increased up to 10 times more than that prepared by SSR method. However, Li2SrSiO4:Eu 2+ phosphor prepared by PGMS exhibited lower emission characteristics and decreased to one-third of that prepared by SSR. The Eu 3+ doped Li2SrSiO4 synthesized by SSR method using different silicate (Si) sources revealed peculiar optical properties and this is the first kind of its report. The obtained results suggest that the optical properties of Eu (3+/2+) doped in silicate host can be regulated by the alteration of Si source besides sample preparation method. These results open a way to understand the mechanisms responsible for such optical properties and to develop new materials for white LEDs.
Journal of Luminescence, 2018
A series of Sm 3+ doped and Sm 3+ /Eu 3+ co-doped NaCaPO 4 phosphors have been successfully synth... more A series of Sm 3+ doped and Sm 3+ /Eu 3+ co-doped NaCaPO 4 phosphors have been successfully synthesized via molten salt method. The structural, morphological, optical, photoluminescence and decay properties of the synthesized phosphors were investigated. Sm 3+ doped phosphor exhibits excellent emission properties in the orangish-red region under n-UV excitation (403 nm), and the optimized doping concentration of Sm 3+ was found to be 1.0 mol%. The excitation spectrum confirms that Sm 3+ /Eu 3+ co-doped NaCaPO 4 phosphors can be efficiently excited by both n-UV and blue LED chips. In the co-doped NaCaPO 4 :Sm 3+ /Eu 3+ phosphors, the intensity of main characteristic emission peaks of Sm 3+ decreased and Eu 3+ increased with increasing Eu 3+ ion concentration. The energy transfer (ET) from Sm 3+ to Eu 3+ was demonstrated to be quadrupole-quadrupole in nature by applying Dexter's ET formula and Reisfeld's approximation. Commission Internationale de l'Eclairage (CIE) chromaticity coordinates for codoped samples lie in the red region. The decay time for the 4 G 5/2 level of Sm 3+ decreases with increasing Eu 3+ concentration, which also indicate the energy transfer from Sm 3+ to Eu 3+. These results indicate that Sm 3+ and Eu 3+ co-doped NaCaPO 4 multifunctional phosphor is a promising and an attractive potential candidate for n-UV and blue excitation based w-LEDs.
Journal of Alloys and Compounds, 2017
Abstract A series of Tb3+/Sm3+ co-doped ZPBT glasses have been successfully prepared via melt que... more Abstract A series of Tb3+/Sm3+ co-doped ZPBT glasses have been successfully prepared via melt quenching technique and their photoluminescence properties and energy transfer mechanism were investigated. Tb3+ doped glass exhibits dominant emission peak at 544 nm corresponding to 5D4→7F5 transition under 375 nm excitation whereas Sm3+ doped glass exhibits intense emission peak at 599 nm corresponding to 4G5/2 → 6H7/2 under 399 nm excitation. The CIE chromaticity coordinates (0.259, 0.590) and (0.570, 0.428) are located in the pure green and orange region for Tb3+ and Sm3+ doped glasses, respectively. The Tb3+/Sm3+ co-doped glasses under 375 nm excitation emit a combination of blue, green and orange-red light while under 484 nm excitation emits green and red-orange emission light. The energy transfer occurs from Tb3+ to Sm3+ via dipole-dipole interaction, which was confirmed by applying Dexter and Reisfeld's theory and Inokuti Hirayama (I-H) model. Moreover, the energy transfer efficiencies and probabilities were calculated from the decay curves. The color tone of these glasses can be modulated from yellowish-green to warm-white via greenish-yellow by appropriate tuning of Sm3+ concentrations and excitation wavelengths. These results indicate that the prepared glasses can be a potential candidate for white light as well as solid state lighting applications.
Journal of Luminescence, 2017
Effective sensitization of Eu 3+ and energy transfer in Sm 3+ /Eu 3+ co-doped ZPBT glasses for Cu... more Effective sensitization of Eu 3+ and energy transfer in Sm 3+ /Eu 3+ co-doped ZPBT glasses for CuPc based solar cell and w-LEDs applications,
Journal of Alloys and Compounds, 2017
In this work, Tb 3+ ions doped lead-germanate-tellurite (LGT) glasses were prepared by convention... more In this work, Tb 3+ ions doped lead-germanate-tellurite (LGT) glasses were prepared by conventional melt quenching technique with different dopant concentrations ranging from 0.5 to 3.5 mol %. X-ray diffraction (XRD) and FT-IR analysis were carried out to analyze the structural properties of LGT glass. The excitation spectra revealed a single band centered in the NUV region at 380 nm by monitoring emission at 545 nm. The emission spectra consist of four bands, which are attributed to the 5 D 4 → 7 F J (J= 3-6) transitions. Among these transitions, the strong emission band was observed at 545 nm corresponding to the 5 D 4 → 7 F 5 transition and the optimized doping concentration of Tb 3+ ions was 2 mol %. The Huang's theory and I-H model indicate the possibility of energy transfer via electric dipole-dipole interaction between Tb 3+ ions. The CIE chromaticity coordinates were (x = 0.282 and y = 0.614) and emits intense yellowish green light. The decay curves measured for 5 D 4 level for the samples with different doping concentrations and the lifetime for the optimized sample was 548 µs. The results indicated that these glasses have potential applications in solid state lighting and display devices.
Journal of the American Ceramic Society, 2017
Quaternary alkaline earth zinc-phosphate glasses in molar composition (40 À x) ZnO-35P 2 O 5-20RO... more Quaternary alkaline earth zinc-phosphate glasses in molar composition (40 À x) ZnO-35P 2 O 5-20RO-5TiO 2-xEu 2 O 3 (where x=1 and R=Mg, Ca, Sr, and Ba) were prepared by melt quenching technique. These glasses were studied with respect to their thermal, structural, and photoluminescent properties. The maximum value of the glass transition temperature (T g) was observed for BaO network modifier mixed glass and minimum was observed for MgO network modifier glass. All the glasses were found to be amorphous in nature. The FT-IR suggested the glasses to be in pyrophosphate structure, which matches with the theoretical estimation of O/P atomic ratio and the maximum depolymerization was observed for glass mixed with BaO network modifier. The intense emission peak was observed at 613 nm (5 D 0 ? 7 F 2) under excitation of 392 nm, which matches well with excitation of commercial n-UV LED chips. The highest emission intensity and quantum efficiency was observed for the glass mixed with BaO network modifier. Based on these results, another set of glass samples was prepared with molar composition (40 À x) ZnO-35P 2 O 5-20BaO-5TiO 2-xEu 2 O 3 (x=3, 5, 7, and 9) to investigate the optimized emission intensity in these glasses. The glasses exhibited crystalline features along with amorphous nature and a drastic variation in asymmetric ratio at higher concentration (7 and 9 mol%) of Eu 2 O 3. The color of emission also shifted from red to reddish orange with increase in the concentration of Eu 2 O 3. These glasses are potential candidates to use as a red photoluminsecent component in the field of solid-state lighting devices.
Journal of Luminescence, 2017
Europium activated NaCaPO 4 phosphor has been synthesized by various synthesis techniques such as... more Europium activated NaCaPO 4 phosphor has been synthesized by various synthesis techniques such as solid-state reaction (SSR), molten salt synthesis (MSS) and sol-gel combustion (SGC) method to optimize the synthesis procedure. The comparative investigations of structural and luminescent properties have been studied to know the best synthesis method. The XRD patterns and Rietveld refinement analysis of the synthesized phosphors confirmed the single phase orthorhombic structure of NaCaPO 4. Excitation spectra indicate the strong absorption in near ultraviolet (n-UV) region and the emission spectra exhibit strong emission band at 595 nm corresponds to 5 D 0 → 7 F 1 transition under n-UV (λ ex =392 nm) excitation. The SGC route synthesized phosphor exhibit intense emission than that of the SSR and MSS method. Therefore, the effect of dopant (Eu 3+) concentration on the emission intensity and concentration quenching mechanism has been discussed in detail for the Eu 3+ doped NaCaPO 4 phosphor synthesized by SGC method. The CIE chromaticity coordinates have been calculated for the phosphors synthesized by SSR, MSS and SGC methods to reveal the emitting color and also to know the utility of this phosphor for white LEDs.
Journal of Alloys and Compounds, 2016
Optically transparent dysprosium ions doped lead zinc phosphate glasses have been prepared via me... more Optically transparent dysprosium ions doped lead zinc phosphate glasses have been prepared via melt quenching technique to study the luminescent properties and their applications for white light emitting diodes (w-LEDs). X-ray diffraction (XRD) spectrum confirmed the amorphous nature of the as-prepared glass. The glass transition temperature (T g) and thermal stability (∆T) were determined by using Differential Scanning Calorimetry (DSC). The vibrational features were characterized by Raman and FT-IR, which indicate the presence of poly-phosphate structure dominated by Q 2 and Q 1 structural units. The intense emission bands observed at 482 nm (blue) and 574 nm (yellow), where the yellow to blue intensity ratio for all excitation wavelengths (NUV to blue range) were found to lie in the vicinity of unity, yielding to intense white light emission. The evaluated CIE chromaticity coordinates (0.309, 0.341) for the optimized glass (GP10) at 350 nm excitation fall in the pure white region, which is in proximity with commercial w-LED (Blue LED +YAG:Ce 3+) and NTSC system for white light emission. The correlated color temperature (CCT) of the optimized glass is 6547 K, which represents cool white light emission. The decay profiles have been measured for the excited 4 F 9/2 level and analyzed.
Dalton Transactions, 2015
Single-phase cool white-light emitting BaNb2O6:Dy3+ phosphors have been synthesized and their str... more Single-phase cool white-light emitting BaNb2O6:Dy3+ phosphors have been synthesized and their structural, luminescence and colorimetric properties have been investigated in detail.
ChemInform, 2015
BaNb2O6:Eu3+ phosphors (1, 4, 10, 12, 14, 16 mol% Eu) are prepared by calcination of stoichiometr... more BaNb2O6:Eu3+ phosphors (1, 4, 10, 12, 14, 16 mol% Eu) are prepared by calcination of stoichiometric amounts of BaCO3, Nb2O5, and Eu2O3 in air (1.
Journal of Non-Crystalline Solids, 2021
Dy 3+ doped and Dy 3+ /Eu 3+ co-doped zinc phosphate barium titanate (ZPBT) glasses were successf... more Dy 3+ doped and Dy 3+ /Eu 3+ co-doped zinc phosphate barium titanate (ZPBT) glasses were successfully synthesized by melt quenching procedure. The co-doped glasses revealed emission peaks in the blue, yellow, orange, and red spectral regions. The combinations of these emission yield white light (cool, neutral, and warm) and orangish-red light. The tunable emission is attained by appropriately regulating Eu 3+ concentrations and excitation wavelengths. The emission and decay analysis revealed the energy transfer arising due to dipolar-dipolar interaction from Dy 3+ to Eu 3+. The emission intensity and the chromaticity shift observed at 423 K were 72.54 % and 7.74 ×10 − 3 , respectively signifying the strong thermal stability of the co-doped ZPBT glass. An epoxy-resin free device was demonstrated using 1.0 mol% Dy 3+ /Eu 3+ co-doped glass and 385 nm n-UV LED chip. The results mentioned-above indicate that Dy 3+ /Eu 3+ co-doped synthesized glasses are promising candidates for epoxy-free high powered w-LED applications under n-UV excitation.
To investigate how central metal tunes the synergetic interactions between substituted metallo-ph... more To investigate how central metal tunes the synergetic interactions between substituted metallo-phthalocyanine and single-walled carbon nanotubes in enhancing the gas sensing properties, a comparative study has been performed by varying the central metal ion in fluorinated metal phthalocyanines and single-walled carbon nanotube hybrid. Hybrids of metal(ii)-1,2,3,4,8,9,10,11,15,16,17,18-24,25-hexa-decafluoro-29H,31H-phthalocyanine/single-walled carbon nanotube (F16MPc/SWCNTs-COOH, where M = Co, Zn) have been synthesized through - stacking interactions using the solution route. Spectroscopic (FT-IR, UV-vis, XPS and Raman), electron microscopic (TEM and FE-SEM) and TGA investigations have confirmed the successful functionalization and interaction of SWCNTs-COOH with F16MPc. Parts per billion (ppb) level Cl-2-selective chemiresistive gas sensors have been fabricated on glass substrates with precoated gold electrodes by using these hybrids. The responses of various F16MPc/SWCNTs-COOH sensors have demonstrated the central metal ion-dependence in the sensitivity of Cl-2.
Journal of the Korean Physical Society, 2018
In this work, a silicate based phosphor doped with divalent and trivalent europium (Eu (2+/3+)) i... more In this work, a silicate based phosphor doped with divalent and trivalent europium (Eu (2+/3+)) ions have been synthesized by two different synthesis processes, PGMS (propylene glycol modified silane) assisted sol-gel and solid state reaction (SSR) method. The structural, morphological and optical properties were studied in detail. The emission intensity of Li2SrSiO4:Eu 3+ phosphors synthesized through the PGMS assisted sol-gel increased up to 10 times more than that prepared by SSR method. However, Li2SrSiO4:Eu 2+ phosphor prepared by PGMS exhibited lower emission characteristics and decreased to one-third of that prepared by SSR. The Eu 3+ doped Li2SrSiO4 synthesized by SSR method using different silicate (Si) sources revealed peculiar optical properties and this is the first kind of its report. The obtained results suggest that the optical properties of Eu (3+/2+) doped in silicate host can be regulated by the alteration of Si source besides sample preparation method. These results open a way to understand the mechanisms responsible for such optical properties and to develop new materials for white LEDs.
Journal of Luminescence, 2018
A series of Sm 3+ doped and Sm 3+ /Eu 3+ co-doped NaCaPO 4 phosphors have been successfully synth... more A series of Sm 3+ doped and Sm 3+ /Eu 3+ co-doped NaCaPO 4 phosphors have been successfully synthesized via molten salt method. The structural, morphological, optical, photoluminescence and decay properties of the synthesized phosphors were investigated. Sm 3+ doped phosphor exhibits excellent emission properties in the orangish-red region under n-UV excitation (403 nm), and the optimized doping concentration of Sm 3+ was found to be 1.0 mol%. The excitation spectrum confirms that Sm 3+ /Eu 3+ co-doped NaCaPO 4 phosphors can be efficiently excited by both n-UV and blue LED chips. In the co-doped NaCaPO 4 :Sm 3+ /Eu 3+ phosphors, the intensity of main characteristic emission peaks of Sm 3+ decreased and Eu 3+ increased with increasing Eu 3+ ion concentration. The energy transfer (ET) from Sm 3+ to Eu 3+ was demonstrated to be quadrupole-quadrupole in nature by applying Dexter's ET formula and Reisfeld's approximation. Commission Internationale de l'Eclairage (CIE) chromaticity coordinates for codoped samples lie in the red region. The decay time for the 4 G 5/2 level of Sm 3+ decreases with increasing Eu 3+ concentration, which also indicate the energy transfer from Sm 3+ to Eu 3+. These results indicate that Sm 3+ and Eu 3+ co-doped NaCaPO 4 multifunctional phosphor is a promising and an attractive potential candidate for n-UV and blue excitation based w-LEDs.
Journal of Alloys and Compounds, 2017
Abstract A series of Tb3+/Sm3+ co-doped ZPBT glasses have been successfully prepared via melt que... more Abstract A series of Tb3+/Sm3+ co-doped ZPBT glasses have been successfully prepared via melt quenching technique and their photoluminescence properties and energy transfer mechanism were investigated. Tb3+ doped glass exhibits dominant emission peak at 544 nm corresponding to 5D4→7F5 transition under 375 nm excitation whereas Sm3+ doped glass exhibits intense emission peak at 599 nm corresponding to 4G5/2 → 6H7/2 under 399 nm excitation. The CIE chromaticity coordinates (0.259, 0.590) and (0.570, 0.428) are located in the pure green and orange region for Tb3+ and Sm3+ doped glasses, respectively. The Tb3+/Sm3+ co-doped glasses under 375 nm excitation emit a combination of blue, green and orange-red light while under 484 nm excitation emits green and red-orange emission light. The energy transfer occurs from Tb3+ to Sm3+ via dipole-dipole interaction, which was confirmed by applying Dexter and Reisfeld's theory and Inokuti Hirayama (I-H) model. Moreover, the energy transfer efficiencies and probabilities were calculated from the decay curves. The color tone of these glasses can be modulated from yellowish-green to warm-white via greenish-yellow by appropriate tuning of Sm3+ concentrations and excitation wavelengths. These results indicate that the prepared glasses can be a potential candidate for white light as well as solid state lighting applications.
Journal of Luminescence, 2017
Effective sensitization of Eu 3+ and energy transfer in Sm 3+ /Eu 3+ co-doped ZPBT glasses for Cu... more Effective sensitization of Eu 3+ and energy transfer in Sm 3+ /Eu 3+ co-doped ZPBT glasses for CuPc based solar cell and w-LEDs applications,
Journal of Alloys and Compounds, 2017
In this work, Tb 3+ ions doped lead-germanate-tellurite (LGT) glasses were prepared by convention... more In this work, Tb 3+ ions doped lead-germanate-tellurite (LGT) glasses were prepared by conventional melt quenching technique with different dopant concentrations ranging from 0.5 to 3.5 mol %. X-ray diffraction (XRD) and FT-IR analysis were carried out to analyze the structural properties of LGT glass. The excitation spectra revealed a single band centered in the NUV region at 380 nm by monitoring emission at 545 nm. The emission spectra consist of four bands, which are attributed to the 5 D 4 → 7 F J (J= 3-6) transitions. Among these transitions, the strong emission band was observed at 545 nm corresponding to the 5 D 4 → 7 F 5 transition and the optimized doping concentration of Tb 3+ ions was 2 mol %. The Huang's theory and I-H model indicate the possibility of energy transfer via electric dipole-dipole interaction between Tb 3+ ions. The CIE chromaticity coordinates were (x = 0.282 and y = 0.614) and emits intense yellowish green light. The decay curves measured for 5 D 4 level for the samples with different doping concentrations and the lifetime for the optimized sample was 548 µs. The results indicated that these glasses have potential applications in solid state lighting and display devices.
Journal of the American Ceramic Society, 2017
Quaternary alkaline earth zinc-phosphate glasses in molar composition (40 À x) ZnO-35P 2 O 5-20RO... more Quaternary alkaline earth zinc-phosphate glasses in molar composition (40 À x) ZnO-35P 2 O 5-20RO-5TiO 2-xEu 2 O 3 (where x=1 and R=Mg, Ca, Sr, and Ba) were prepared by melt quenching technique. These glasses were studied with respect to their thermal, structural, and photoluminescent properties. The maximum value of the glass transition temperature (T g) was observed for BaO network modifier mixed glass and minimum was observed for MgO network modifier glass. All the glasses were found to be amorphous in nature. The FT-IR suggested the glasses to be in pyrophosphate structure, which matches with the theoretical estimation of O/P atomic ratio and the maximum depolymerization was observed for glass mixed with BaO network modifier. The intense emission peak was observed at 613 nm (5 D 0 ? 7 F 2) under excitation of 392 nm, which matches well with excitation of commercial n-UV LED chips. The highest emission intensity and quantum efficiency was observed for the glass mixed with BaO network modifier. Based on these results, another set of glass samples was prepared with molar composition (40 À x) ZnO-35P 2 O 5-20BaO-5TiO 2-xEu 2 O 3 (x=3, 5, 7, and 9) to investigate the optimized emission intensity in these glasses. The glasses exhibited crystalline features along with amorphous nature and a drastic variation in asymmetric ratio at higher concentration (7 and 9 mol%) of Eu 2 O 3. The color of emission also shifted from red to reddish orange with increase in the concentration of Eu 2 O 3. These glasses are potential candidates to use as a red photoluminsecent component in the field of solid-state lighting devices.
Journal of Luminescence, 2017
Europium activated NaCaPO 4 phosphor has been synthesized by various synthesis techniques such as... more Europium activated NaCaPO 4 phosphor has been synthesized by various synthesis techniques such as solid-state reaction (SSR), molten salt synthesis (MSS) and sol-gel combustion (SGC) method to optimize the synthesis procedure. The comparative investigations of structural and luminescent properties have been studied to know the best synthesis method. The XRD patterns and Rietveld refinement analysis of the synthesized phosphors confirmed the single phase orthorhombic structure of NaCaPO 4. Excitation spectra indicate the strong absorption in near ultraviolet (n-UV) region and the emission spectra exhibit strong emission band at 595 nm corresponds to 5 D 0 → 7 F 1 transition under n-UV (λ ex =392 nm) excitation. The SGC route synthesized phosphor exhibit intense emission than that of the SSR and MSS method. Therefore, the effect of dopant (Eu 3+) concentration on the emission intensity and concentration quenching mechanism has been discussed in detail for the Eu 3+ doped NaCaPO 4 phosphor synthesized by SGC method. The CIE chromaticity coordinates have been calculated for the phosphors synthesized by SSR, MSS and SGC methods to reveal the emitting color and also to know the utility of this phosphor for white LEDs.
Journal of Alloys and Compounds, 2016
Optically transparent dysprosium ions doped lead zinc phosphate glasses have been prepared via me... more Optically transparent dysprosium ions doped lead zinc phosphate glasses have been prepared via melt quenching technique to study the luminescent properties and their applications for white light emitting diodes (w-LEDs). X-ray diffraction (XRD) spectrum confirmed the amorphous nature of the as-prepared glass. The glass transition temperature (T g) and thermal stability (∆T) were determined by using Differential Scanning Calorimetry (DSC). The vibrational features were characterized by Raman and FT-IR, which indicate the presence of poly-phosphate structure dominated by Q 2 and Q 1 structural units. The intense emission bands observed at 482 nm (blue) and 574 nm (yellow), where the yellow to blue intensity ratio for all excitation wavelengths (NUV to blue range) were found to lie in the vicinity of unity, yielding to intense white light emission. The evaluated CIE chromaticity coordinates (0.309, 0.341) for the optimized glass (GP10) at 350 nm excitation fall in the pure white region, which is in proximity with commercial w-LED (Blue LED +YAG:Ce 3+) and NTSC system for white light emission. The correlated color temperature (CCT) of the optimized glass is 6547 K, which represents cool white light emission. The decay profiles have been measured for the excited 4 F 9/2 level and analyzed.
Dalton Transactions, 2015
Single-phase cool white-light emitting BaNb2O6:Dy3+ phosphors have been synthesized and their str... more Single-phase cool white-light emitting BaNb2O6:Dy3+ phosphors have been synthesized and their structural, luminescence and colorimetric properties have been investigated in detail.
ChemInform, 2015
BaNb2O6:Eu3+ phosphors (1, 4, 10, 12, 14, 16 mol% Eu) are prepared by calcination of stoichiometr... more BaNb2O6:Eu3+ phosphors (1, 4, 10, 12, 14, 16 mol% Eu) are prepared by calcination of stoichiometric amounts of BaCO3, Nb2O5, and Eu2O3 in air (1.
Journal of Non-Crystalline Solids, 2021
Dy 3+ doped and Dy 3+ /Eu 3+ co-doped zinc phosphate barium titanate (ZPBT) glasses were successf... more Dy 3+ doped and Dy 3+ /Eu 3+ co-doped zinc phosphate barium titanate (ZPBT) glasses were successfully synthesized by melt quenching procedure. The co-doped glasses revealed emission peaks in the blue, yellow, orange, and red spectral regions. The combinations of these emission yield white light (cool, neutral, and warm) and orangish-red light. The tunable emission is attained by appropriately regulating Eu 3+ concentrations and excitation wavelengths. The emission and decay analysis revealed the energy transfer arising due to dipolar-dipolar interaction from Dy 3+ to Eu 3+. The emission intensity and the chromaticity shift observed at 423 K were 72.54 % and 7.74 ×10 − 3 , respectively signifying the strong thermal stability of the co-doped ZPBT glass. An epoxy-resin free device was demonstrated using 1.0 mol% Dy 3+ /Eu 3+ co-doped glass and 385 nm n-UV LED chip. The results mentioned-above indicate that Dy 3+ /Eu 3+ co-doped synthesized glasses are promising candidates for epoxy-free high powered w-LED applications under n-UV excitation.