Large enhancement in upconverted green emission intensity from Ho3+/Yb3+ co-doped Y2Ti2O7 phosphor in the presence of Zn2+

Vishwakarma, Pradeep Kumar; Bahadur, Anant; Maurya, Ashish Kumar; Rai, S.B.

doi:10.1016/j.materresbull.2019.03.029

Cited by 37 publications

(11 citation statements)

References 34 publications

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“…Furthermore, Li + , Ca 2+ , and Bi 3+ are extensively used as codopants due to their ability to occupy substitutional or interstitial locations within the crystal lattice. They increase the luminescence intensity by altering the particle’s shape and size, increasing crystallinity and asymmetry in the crystal field environment, or creating defects. , Further, enhanced emission intensity can be explained by charge compensation, which plays a vital role in the substitution of Li + , Ca 2+ , and Bi 3+ ions to the La 3+ site; the charge balance is achieved via the following equations: 2 V La ″ ′ + Eu 3 + + Li + → Eu La + Li La ″ 2 V La ″ ′ + Eu 3 + + Ca 2 + → Eu La + Ca La ′ 2 V La ″ ′ + Eu 3 + + Bi 3 + → Eu La + Bi La …”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…Similar results have been obtained with other rare-earth activated phosphor materials, under the inuence of metal ion codoping. 22,23 These changes are attributed to the difference in the cations radii of dopants and the host compound, which results in some distortion in the sublattice structure. Further inuence of Mg 2+ ion doping on the morphology was studied using SEM.…”

Section: Resultsmentioning

confidence: 99%

Enhanced near infrared-to-visible upconversion in the CaTiO₃:Yb³⁺/Er³⁺ phosphor via the host lattice modification using co-doping of Mg²⁺ ions

Tripathi,

Kamada,

Nakamura

et al. 2023

RSC Adv.

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“…The nanocrystals showed red emission under 980 nm excitation. By solid-state reaction method, Vishwakarma [4] synthesized Ho 3+ -Yb 3+ co-doped Y 2 Ti 2 O 7 phosphors, the intensity of green emission was enhanced by 92 times after the introduction of 30 mol% of Zn 2+ .…”

Section: Introductionmentioning

confidence: 99%

Up-conversion luminescence properties of Tb3+ doped glass ceramics containing Y2Ti2O7 crystalline phase

Su²

2023

International Conference on Optical Technology, Semiconductor Materials, and Devices (OTSMD 2022)

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In recent years, rare earth doped optical materials have been widely used in w-LEDs, optical displays and lasers. Glass ceramics containing titanate crystal phases are widely used in the matrix of luminescent materials because of their high thermal and chemical stability, excellent luminescence properties, and low phonon energy. However, Y 2 Ti 2 O 7 with a pyrochlore structure is considered a good up-conversion luminescent matrix owing to its low phonon energy (<712 cm -1 ). By the melt crystallization, Tb 3+ doped transparent glass ceramics (GCs) were prepared. Y 2 Ti 2 O 7 crystal phase in glass ceramics was decided by using X-ray diffraction. The light transmittance of the glass ceramics can reach 71% in the visible region. The emission intensity is the strongest when the doping concentration of Tb 3+ is 0.4%. Compared with the precursor glass, glass ceramics have higher luminescence intensity. It can be concluded that Tb 3+ doped transparent glass ceramics containing Y 2 Ti 2 O 7 crystal can be used in green light emission fields.

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Large enhancement in upconverted green emission intensity from Ho3+/Yb3+ co-doped Y2Ti2O7 phosphor in the presence of Zn2+

Cited by 37 publications

References 34 publications

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

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

Enhanced near infrared-to-visible upconversion in the CaTiO₃:Yb³⁺/Er³⁺ phosphor via the host lattice modification using co-doping of Mg²⁺ ions

Up-conversion luminescence properties of Tb3+ doped glass ceramics containing Y2Ti2O7 crystalline phase

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Large enhancement in upconverted green emission intensity from Ho3+/Yb3+ co-doped Y2Ti2O7 phosphor in the presence of Zn2+

Cited by 37 publications

References 34 publications

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

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

Enhanced near infrared-to-visible upconversion in the CaTiO3:Yb3+/Er3+ phosphor via the host lattice modification using co-doping of Mg2+ ions

Up-conversion luminescence properties of Tb3+ doped glass ceramics containing Y2Ti2O7 crystalline phase

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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

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

Enhanced near infrared-to-visible upconversion in the CaTiO₃:Yb³⁺/Er³⁺ phosphor via the host lattice modification using co-doping of Mg²⁺ ions