Bi3+ assisted luminescence in SrMoO4:Sm3+ red phosphors

Chauhan, Vaibhav; Dixit, Prashant; Pandey, Praveen C.

doi:10.1016/j.jre.2020.10.014

Cited by 25 publications

(15 citation statements)

References 47 publications

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“…In the case of the direct allowed band, direct forbidden band, indirect allowed band, and direct forbidden band, we put n = 0.5, 1.5, 2, and 3, respectively. In our earlier reports, we have stated that SrMoO 4 phosphors have a direct allowed electronic transition. , Figure b shows a Tauc plot of D4H x phosphors. By extrapolating the linear part of the Tauc plot, the x -intercept for (α h ν) 2 = 0 yields the value of E g in eV.…”

Section: Resultsmentioning

confidence: 83%

“…The biexponential function in eq is used to fit the decay curves I ( t ) = I 0 + B 1 .25em exp ( − t τ 1 ) + B 2 .25em exp ( − t τ 2 ) where τ 1 signifies fast decay time and τ 2 signifies the slow decay time of the 4 F 9/2 level of the Dy 3+ ion; I 0 is the background intensity after prolonged excitation; and B 1 and B 2 are constants. The average lifetime is evaluated using the following equation τ o = ( A 1 τ 1 2 + A 2 τ 2 2 ) / ( A 1 τ 1 + A 2 τ 2 ) …”

Section: Resultsmentioning

confidence: 99%

“…In our earlier reports, we have stated that SrMoO 4 phosphors have a direct allowed electronic transition. 15,37 Figure 4b shows 38 The O 2− → Dy 3+ CTB lies at the longer wavelength side. 30 As the concentration of the Dy 3+ ions increases, the O 2− → Dy 3+ transition also increases, and therefore, the excitation spectra are red-shifted.…”

Section: Xps Analysismentioning

confidence: 96%

See 2 more Smart Citations

Dy³⁺-Assisted Negative-Thermal Quenching in Ho³⁺-Doped SrMoO₄ for Luminescence Thermometry and Lighting Applications

Chauhan,

Dixit,

Pandey

et al. 2023

J. Phys. Chem. C

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Xps Analysismentioning

confidence: 96%

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Dy³⁺-Assisted Negative-Thermal Quenching in Ho³⁺-Doped SrMoO₄ for Luminescence Thermometry and Lighting Applications

Chauhan,

Dixit,

Pandey

et al. 2023

J. Phys. Chem. C

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“…5−7 However, many of the aforementioned compounds require a reduced atmosphere for their synthesis, which limits their use for large-scale industrial production. 8 RE ion-doped molybdate compound hosts have been extensively studied due to their exceptional stability and remarkable features. These qualities include the capacity to exhibit downshifting and upconversion luminescence, as observed in materials such as Y 2 MoO 6 :Sm SrMoO 4 :Ln (Ln = Eu 3+ , Tb 3+ , or Dy 3+ ), CaMoO 4 :Eu 3+ , NaYb(MoO 4 ) 2 :Yb 3+ , Tm 3+ /Er 3+ /Ho 3+ , KBaY(MoO 4 ) 3 :Ln 3+ (Ln 3+ = Sm 3+ , Tb 3+ , Eu 3+ , Tb 3+ /Sm 3+ , or Tb 3+ /Eu 3+ ), etc.…”

Section: Introductionmentioning

confidence: 99%

Role of Sensitizer Ions in Enhancing the Luminescence Intensity of Eu³⁺-Activated NaLa(MoO₄)₂ Phosphors and Judd–Ofelt Analysis for Solid-State Lighting and Temperature-Sensing Applications

Sonali,

Chauhan,

Pandey

et al. 2024

ACS Appl. Opt. Mater.

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Here, we report the effect of monovalent, divalent, and trivalent ions codoping on the luminescence and temperaturesensing properties of the NaLa(MoO 4 ) 2 :Eu 3+ phosphors. The phosphors were developed by a conventional solid-state synthesis at 750 °C/4 h. Structure refinement of the XRD data by the Rietveld method reveals that all the compounds are crystallized in nature with the tetragonal crystal structure and I4 1 /a space group. The XPS results confirmed the oxidation state of Eu 3+ and Mo 6+ in the doped phosphors. The PL emission intensity increases with increasing Eu 3+ content up to 11 mol %. Further, an enhancement in the emission intensity by factors of 15.5, 1.4, and 1.6 is observed after the incorporation of Li + , Ca 2+ , and Bi 3+ codopant ions, respectively, in NaLa(MoO 4 ) 2 :Eu 3+ (7 mol %). The Judd−Ofelt theory was used to compute the intensity parameters (Ω 2 , Ω 4 ) and radiative properties, such as radiative lifetime (τ rad ), transition probabilities (A T ), and branching ratio. A high activation energy of about 0.33 eV was obtained for the Li + -codoped NaLa(MoO 4 ) 2 :Eu 3+ phosphor, validating the high thermal stability of the phosphor. About 57% luminescence intensity was retained even at 423 K. The phosphors were also investigated for the temperature-sensing application by the fluorescence intensity ratio principle. The relative sensitivity was calculated for two different peak ratios. The maximum values of relative sensitivity at 300 K for I 536 /I 590 and I 536 /I 615 are 0.29 and 0.65% K −1 , respectively. The CIE color coordinates lie in the red region, and the correlated color temperature values were observed between 1621 and 2314 K. Synthesized phosphors can act as promising multifunctional materials for the development of red components in solid-state lighting, laser applications, and noncontact optical temperature sensors.

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“…Till date, several hosts sul des, silicates, borates, tungstate, molybdates, phosphates, etc. has been extensively studied [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Enrichment of Luminescence via Incorporation of Fluxes in La2Zr2O7:Tb3+ Nanophosphors: One Material, Many Possibilities-Latent Fingerprint Visualization, Anti- counterfeiting, Luminescent Flexible Films

Lavanya

Darshan

Malleshappa

et al. 2021

Preprint

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Engineering of single material with multidirectional applications is of crucial for improving the productivity, low cost, flexibility and least power consumption, etc. To achieve these requirements, novel design structures and high performance materials are in urgent need. Lanthanide-doped nanophosphors have greatest strengths and ability in order to tuning its applications in various dimensions. However, nanophosphor applications in latent fingerprints visualization, anti-counterfeiting and luminescent gels/films are still in its infancy. This study demonstrated a simple strategy to enhance the luminescence of Tb3+ doped (1-11 mol %) La2Zr2O7 nanophosphors by conjugating the fluxes via simple solution combustion route. The photoluminescence spectra reveal intense peaks at ~ 491, 546, 587 and 622 nm arises from 5D4◊7FJ (J = 6, 5, 4, 3) transitions of Tb3+ ions, respectively. The highest emission intensity was achieved in the NH4Cl flux assisted nanophosphor as compared to NaBr and NH4F. The colorimetric images of fingerprints visualized using optimized nanophosphor on forensic related surfaces exhibit level –III ridge details, including sweat pores, width of the ridges, bifurcation angle, successive distance between sweat pores, etc. These results are decisive parameters which clearly supports the statement “no two persons have ever been found to have the same fingerprints”. The anti-counterfeiting security ink was formulated using nanophosphor and designed various patterns by simple screen printing and dip pen technology. The encoded information was decrypted only under ultraviolet 254 nm light. All the designed patterns are not just what it looks/feels like and how it works. As a synergetic contribution of enhanced luminescence of the prepared nanophosphor, the fabricated green-emissive films display excellent flexibility, uniformity and transparency in the normal and ultraviolet 254 nm light illumination. Aforementioned results revealed that prepared NH4Cl flux assisted La2Zr2O7: Tb3+(7 mol %) NPs are considered to be best candidate for multi-dimensional applications.

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Bi3+ assisted luminescence in SrMoO4:Sm3+ red phosphors

Cited by 25 publications

References 47 publications

Dy³⁺-Assisted Negative-Thermal Quenching in Ho³⁺-Doped SrMoO₄ for Luminescence Thermometry and Lighting Applications

Dy³⁺-Assisted Negative-Thermal Quenching in Ho³⁺-Doped SrMoO₄ for Luminescence Thermometry and Lighting Applications

Role of Sensitizer Ions in Enhancing the Luminescence Intensity of Eu³⁺-Activated NaLa(MoO₄)₂ Phosphors and Judd–Ofelt Analysis for Solid-State Lighting and Temperature-Sensing Applications

Enrichment of Luminescence via Incorporation of Fluxes in La2Zr2O7:Tb3+ Nanophosphors: One Material, Many Possibilities-Latent Fingerprint Visualization, Anti- counterfeiting, Luminescent Flexible Films

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Bi3+ assisted luminescence in SrMoO4:Sm3+ red phosphors

Cited by 25 publications

References 47 publications

Dy3+-Assisted Negative-Thermal Quenching in Ho3+-Doped SrMoO4 for Luminescence Thermometry and Lighting Applications

Dy3+-Assisted Negative-Thermal Quenching in Ho3+-Doped SrMoO4 for Luminescence Thermometry and Lighting Applications

Role of Sensitizer Ions in Enhancing the Luminescence Intensity of Eu3+-Activated NaLa(MoO4)2 Phosphors and Judd–Ofelt Analysis for Solid-State Lighting and Temperature-Sensing Applications

Enrichment of Luminescence via Incorporation of Fluxes in La2Zr2O7:Tb3+ Nanophosphors: One Material, Many Possibilities-Latent Fingerprint Visualization, Anti- counterfeiting, Luminescent Flexible Films

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Dy³⁺-Assisted Negative-Thermal Quenching in Ho³⁺-Doped SrMoO₄ for Luminescence Thermometry and Lighting Applications

Dy³⁺-Assisted Negative-Thermal Quenching in Ho³⁺-Doped SrMoO₄ for Luminescence Thermometry and Lighting Applications

Role of Sensitizer Ions in Enhancing the Luminescence Intensity of Eu³⁺-Activated NaLa(MoO₄)₂ Phosphors and Judd–Ofelt Analysis for Solid-State Lighting and Temperature-Sensing Applications