Enhancing the temperature sensing property of a Ca0.79−xBixEr0.01Yb0.2MoO4 phosphor via local symmetry distortion and reduction in non-radiative channels

Singh, Sachin Kumar; Kachhap, Santosh; Sharma, Manisha; Singh, Sunil Kumar

doi:10.1039/d3ra02929h

Cited by 8 publications

(2 citation statements)

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“…Next, the color tuning of UC emissions can be attained by modifying the local crystal field and dynamics of UC processes via defect engineering by doping impurity ions. ,, In recent years, various codopant ions, such as Mn 2+ , Cr 3+ , Li + , Na + , Mg 2+ , and Bi 3+ , have been explored for tuning the UC emissions. − ,, It has been found that Bi 3+ codoping in Er 3+ -doped UC materials can modulate the UC emissions through crystal field distortion, energy transfer, defect tuning, and manipulation of nonradiative channels. − Hence, investigating the effect of defect manipulation on the excited state absorption of NIR photons by Er 3+ ions will provide a better understanding of the role of defects on UC dynamics.…”

Section: Introductionmentioning

confidence: 99%

ZnAl₂O₄:Er³⁺ Upconversion Nanophosphor for SPECT Imaging and Luminescence Modulation via Defect Engineering

Balhara,

Gupta,

Sudarshan

et al. 2024

ACS Appl. Bio Mater.

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This work reports an "all-in-one" theranostic upconversion luminescence (UCL) system having potential for both diagnostic and therapeutic applications. Despite considerable efforts in designing upconversion nanoparticles (UCNPs) for multimodal imaging and tumor therapy, there are few reports investigating dual modality SPECT/optical imaging for theranostics. Especially, research focusing on in vivo biodistribution studies of intrinsically radiolabeled UCNPs after intravenous injection is of utmost importance for the potential clinical translation of such formulations. Here, we utilized the gamma emission from 169 Er and 171 Er radionuclides for the demonstration of radiolabeled ZnAl 2 O 4 : 171/169 Er 3+ as a potent agent for dual-modality SPECT/ optical imaging. No uptake of radio nanoformulation was detected in the skeleton after 4 h of administration, which evidenced the robust integrity of ZnAl 2 O 4 : 169/171 Er 3+ . Combining the therapeutics using the emission of β − particulates from 169 Er and 171 Er will be promising for the radio-theranostic application of the synthesized ZnAl 2 O 4 : 169/171 Er 3+ nanoformulation. Cell toxicity studies of ZnAl 2 O 4 :1%Er 3+ nanoparticles were examined by an MTT assay in B16F10 mouse melanoma cell lines, which demonstrated good biocompatibility. In addition, we explored the mechanism of UCL modulation via defect engineering by Bi 3+ codoping in the ZnAl 2 O 4 :Er 3+ upconversion nanophosphor. The UCL color tuning was successfully achieved from the red to the green region as a function of Bi 3+ codoping concentrations. Further, we tried to establish a correlation of UCL tuning with the intrinsic oxygen and cation vacancy defects as a function of Bi 3+ codoping concentrations with the help of electron paramagnetic resonance (EPR) and positron annihilation lifetime spectroscopy (PALS) studies. This study contributes to building a bridge between nature of defects and UC luminescence that is crucial for the design of advanced UCNPs for theranostics.

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Section: Introductionmentioning

confidence: 99%

ZnAl₂O₄:Er³⁺ Upconversion Nanophosphor for SPECT Imaging and Luminescence Modulation via Defect Engineering

Balhara,

Gupta,

Sudarshan

et al. 2024

ACS Appl. Bio Mater.

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“…Lanthanide ion doping for an optically active center in different hosts/matrices has been widely explored, such as in high band gap phosphors (Gd 2 O 3 , GdScO 3 , CaMoO 4 , NaYF 4 , Ca 9 Y(VO 4 ) 7 , etc. ), − traditional semiconductors (CdS, CdSe, GaAs, etc. ), and halide perovskites (ABX 3 , AB′B″X 3 : A = organic/inorganic ion; B, B′, B″ = metal ion; X = Cl, Br, and I). − Particularly, the doping of lanthanides in semiconductor nanocrystals/quantum dots unlocks attractive optoelectronic properties such as for photovoltaics, color and white light emitting diodes (LEDs), and detectors along with different types of sensing, anticounterfeiting, and bioimaging applications.…”

Section: Introductionmentioning

confidence: 99%

Expanding the Emission of CsPbBr₃ Nanocrystals in the Blue Region

Kachhap,

Fatima,

Yadav

et al. 2023

ACS Appl. Opt. Mater.

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We report blue emission, along with the characteristic green emission, in CsPbBr 3 nanocrystals (NCs) due to the doping of Eu 2+ ions. The doping of Eu 2+ was confirmed using TEM-EDAX, FTIR, and XPS techniques. The undoped CsPbBr 3 NCs show sharp green emission peaking at 515 nm (fwhm ∼24 nm). Whereas Eu 2+ :CsPbBr 3 NCs show two emission peaks at 498 and 442 nm with fwhm ∼20 and ∼13 nm, respectively. A shift in the green emission of doped NCs is because of reduced average particle size from 19 to 7 nm. The additional emission peak at 442 nm is assigned due to the 4f 6 ( 7 F J )5d 1 → 4f 7 transition of Eu 2+ ions. The intensities of blue and green emissions are both significantly influenced by changing the excitation wavelengths. The decay dynamics study suggests an energy transfer from CsPbBr 3 to the Eu 2+ ions. It is also inferred that Eu 2+ doping improves the radiative channels. Further, the CIE coordinate analysis depicts virtuous luminous efficacy of the optical radiation and significant color purity (>85%) of the emission spectra under different excitations. These optical studies show that the Eu 2+ :CsPbBr 3 NCs can be a potential candidate for multicolor LEDs, displays, and anticounterfeiting applications.

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Alkali Silicates Codoped with NIR-Emitting RE (Nd3+ and Yb3+) Ions for Thermometry Applications

Pali,

Khan,

Sahu

et al. 2024

J Fluoresc

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Enhancing the temperature sensing property of a Ca_0.79−xBi_xEr_0.01Yb_0.2MoO₄ phosphor via local symmetry distortion and reduction in non-radiative channels

Abstract: We demonstrate an enhancement in the upconversion (UC) emission and temperature sensing property of a CaMoO4:Er/Yb phosphor via distortion of the local symmetry environments.

Cited by 8 publications

References 50 publications

ZnAl₂O₄:Er³⁺ Upconversion Nanophosphor for SPECT Imaging and Luminescence Modulation via Defect Engineering

ZnAl₂O₄:Er³⁺ Upconversion Nanophosphor for SPECT Imaging and Luminescence Modulation via Defect Engineering

Expanding the Emission of CsPbBr₃ Nanocrystals in the Blue Region

Alkali Silicates Codoped with NIR-Emitting RE (Nd3+ and Yb3+) Ions for Thermometry Applications

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Enhancing the temperature sensing property of a Ca0.79−xBixEr0.01Yb0.2MoO4 phosphor via local symmetry distortion and reduction in non-radiative channels

Abstract: We demonstrate an enhancement in the upconversion (UC) emission and temperature sensing property of a CaMoO4:Er/Yb phosphor via distortion of the local symmetry environments.

Cited by 8 publications

References 50 publications

ZnAl2O4:Er3+ Upconversion Nanophosphor for SPECT Imaging and Luminescence Modulation via Defect Engineering

ZnAl2O4:Er3+ Upconversion Nanophosphor for SPECT Imaging and Luminescence Modulation via Defect Engineering

Expanding the Emission of CsPbBr3 Nanocrystals in the Blue Region

Alkali Silicates Codoped with NIR-Emitting RE (Nd3+ and Yb3+) Ions for Thermometry Applications

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Product

Resources

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Enhancing the temperature sensing property of a Ca_0.79−xBi_xEr_0.01Yb_0.2MoO₄ phosphor via local symmetry distortion and reduction in non-radiative channels

ZnAl₂O₄:Er³⁺ Upconversion Nanophosphor for SPECT Imaging and Luminescence Modulation via Defect Engineering

ZnAl₂O₄:Er³⁺ Upconversion Nanophosphor for SPECT Imaging and Luminescence Modulation via Defect Engineering

Expanding the Emission of CsPbBr₃ Nanocrystals in the Blue Region