A5026655685- Luminescence Properties of Advanced Materials
- Nanoplatforms for cancer theranostics
- Nanoparticle-Based Drug Delivery
- Glass properties and applications
- Lanthanide and Transition Metal Complexes
- Advanced Radiotherapy Techniques
- Gas Sensing Nanomaterials and Sensors
- Radiation Therapy and Dosimetry
- Quantum Dots Synthesis And Properties
- Medical Imaging Techniques and Applications
- Radiomics and Machine Learning in Medical Imaging
- Luminescence and Fluorescent Materials
- Nuclear materials and radiation effects
- Gold and Silver Nanoparticles Synthesis and Applications
- Photoacoustic and Ultrasonic Imaging
- Solid State Laser Technologies
- Advanced Nanomaterials in Catalysis
- Perovskite Materials and Applications
- Radiation Dose and Imaging
- Cancer, Hypoxia, and Metabolism
- Graphene and Nanomaterials Applications
- Ultrasound and Hyperthermia Applications
- Microwave Dielectric Ceramics Synthesis
- Inorganic Fluorides and Related Compounds
- Radiation Detection and Scintillator Technologies
Medical College of Wisconsin
2017-2025
Froedtert Hospital
2021
Marquette University
2019
Utah State University
2014-2017
Banaras Hindu University
2010-2017
Indian Institute of Technology BHU
2014
Bhabha Atomic Research Centre
2010
UGC DAE Consortium for Scientific Research
2010
Dr. Hari Singh Gour University
2010
The effect of Li+ co-doping on the photoluminescence properties YPO4:Eu is discussed. Interesting behaviours, such as presence intermediate bands, shifting Eu–O charge transfer band (Eu–O CTB) to a lower wavelength, variation in intensities magnetic (5D0 → 7F1) and electric dipole 7F2) transitions Eu3+ shift 5D0 7F0 higher energy with increasing excitation wavelengths are observed. ion does not have an absorption range 340–350 nm, but after at these wavelengths, broad emission (370–570 nm),...
Tb(3+)-doped CaMoO(4) (Tb(3+) = 1, 3, 5, 7, 10, 15 and 20 atom%) core core-shell nanoparticles have been prepared by urea hydrolysis in ethylene glycol (EG) as capping agent well reaction medium at low temperature ~150 °C. As-prepared samples were annealed 500 900 °C for 4 h to eliminate unwanted hydrocarbons and/or H(2)O present the sample improve crystallinity. The synthesised nanophosphors show tetragonal phase structure. crystallite size of as-prepared is found be ~18 nm. luminescence...
Graphical representation of Li<sup>+</sup> co-doped Y<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub>:Er<sup>3+</sup>/Yb<sup>3+</sup> phosphor showing up-conversion green and red bands probing the fluorescence intensity ratio (FIR) for temperature sensing applications.
When Eu(3+) ions occupy Ca(2+) sites of CaMoO(4), which has a body centered tetragonal structure with inversion symmetry, only the magnetic dipole transition ((5)D(0)→(7)F(1)) should be allowed according to Judd-Ofelt theory. Even if there are few distortions in environment, its intensity more than that electric ((5)D(0)→(7)F(2)). We report here opposite effect experimentally and ascribe this polarizability MoO(4) tetrahedron, is neighboring EuO(8) (symmetric environment). The contribution...
The nanoparticles of CaMoO4 : Eu3+ (Eu3+ = 0, 1, 3, 5, 7, 10 at. %) are prepared at low temperature (150 °C for 3 h) using urea hydrolysis in ethylene glycol. These characterized by X-ray diffraction (XRD), infrared spectroscopy (IR) and transmission electron microscopy (TEM). From XRD study, it was found that the solubility limit ions Ca2+ sites is up to % above this, phase segregation occurs. In combination with Rietveld analysis, its crystal structure be tetragonal (space groupI41/a (88)...
We have studied the luminescence property of CaMoO4:Eu3+. The emission peaks at 590 (5D0→7F1) and 613 nm (5D0→7F2) for Eu3+ are observed after excitation 266 (i.e. Mo–O charge transfer band). peak intensity latter dominates over former indicating an asymmetric environment in EuO8 polyhedron or parity mixing. Luminescence increases significantly with co-doping Gd3+. This is ascribed to energy from Mo–O/Gd3+ Eu3+. annealing up 900 °C due extent decrease non-radiative rates. Very high values...
We report sub-100 nm optical/magnetic resonance (MR)/X-ray contrast-bearing theranostic nanoparticles (TNPs) for interventional image-guided photothermal therapy (PTT) of solid tumors. TNPs were composed Au@Gd2O3:Ln (Ln = Yb/Er) with X-ray contrast (∼486 HU; 1014 NPs/mL, 0.167 nM) and MR (∼1.1 × 108 mM-1 S-1 at 9.4 T field strength). Although are deposited in tumors following systemic administration via enhanced permeation retention effect, the delivered dose to is typically low; this can...
Y2Ti2O7 (YTO) and Er3+/Yb3+ co-doped (EYYTO) phosphors have been prepared by solid-state reaction method. Structures of YTO EYYTO are identified as face centered cubic pyrochlores. Up-conversion emission spectra under 976 nm excitation is studied, which revealed three prominent lines at ∼524, 548 661 originating from 2H11/2 → 4I15/2, 4S3/2 4I15/2 4F9/2 electronic transitions Er3+ ion, respectively in green red regions. The power dependence study suggests that these bands arise due to two...
This article explores the tuning of blue to pink colour generation from Li+ ion co-doped YPO4:5Eu nanoparticles prepared by polyol method at ∼100-120 °C with ethylene glycol (EG) as a capping agent. Interaction EG molecules capped on surface and/or created oxygen vacancies induces formation intermediate/mid gap bands in host structure, which is supported UV-Visible absorption data. Strong and colors can be observed cases as-prepared 500 annealed samples, respectively. Co-doping enhances...
Magnetic nanoparticles based hyperthermia therapy is a possible low cost and effective technique for killing cancer tissues in the human body. Fe3O4 Fe3O4@YPO4:5Eu hybrid magnetic are prepared by co-precipitation method their average particle sizes found to be ∼10 25 nm, respectively. The particles spherical, non-agglomerated highly dispersible water. crystallinity of as-prepared YPO4:5Eu sample more than nanoparticles. chemical bonds interaction between confirmed through FeO-P....
A facile auto-combustion route is used for the synthesis of Gd(3+) (2, 5, 7 and 10 at%) co-doped CaMoO4:Eu nanoparticles. X-ray diffraction study suggests that as-prepared samples have extra impurity phases in addition to main tetragonal phase CaMoO4, such decrease as annealing temperature increases from 600 900 °C. The crystal structure has been analysed using Rietveld program. It space group I4₁/a (88) Z = 4 (number CaMoO4 formula units per unit cell). Average crystallite sizes...
As-prepared samples of YPO(4):2Dy nanoparticles prepared by polyol route show strong blue luminescence because host contribution, whereas 500 and 900 °C annealed cold warm white luminescence, respectively different energy transfer rates from to Dy(3+). Li(+) co-doping improves intensity as well crystallinity significantly. Interestingly, ions occupy interstitial sites lattice. These materials will be potential candidates for light emitting diodes near-infrared phosphors.
Highly water dispersible Eu³⁺ doped CaMoO₄ nanoparticles (core) covered by (shell) have been prepared using the polyol method. Significant enhancement in luminescence intensity core@shell formation is observed due to decrease of non-radiative rate arising from surface/defect particles. Effect 266 nm laser excitation (Mo-O charge transfer band) on asymmetric ratio (A₂₁ = electric magnetic dipole transitions) has studied and compared with a xenon lamp source. Luminescence increases increase...
Abstract Objective. AI-generated synthetic CT (sCT) images have become commercially available to provide electron densities and reference anatomies in MR-only radiotherapy workflows. However, hallucinations (false regions of bone or air) introduced sCT may affect the accuracy dose calculation patient setup verification. We developed a tool detect and/or inaccuracies pelvic used Approach. A deep learning auto segmentation (DLAS) model was trained auto-segment on MR images. The implemented...
Rod-like shape particles of tetragonal phase Li+ co-doped YPO4:Eu samples are prepared by using a polyol method at low temperature (∼100–120 °C for 1 h). co-doping enhances the crystalline nature sample and reduces agglomeration among particles. The shift in reflection peaks to lower 2θ angle X-ray diffraction pattern indicates occupancy ions interstitial sites host lattice. point group symmetry Y3+/Eu3+ YPO4 is demonstrated simple representation.