Optically Stimulated Luminescence Phosphors: Principles, Applications, and Prospects

Light-emitting diodes break barriers of size and performance for displays. With devices becoming smaller, the materials also need to get smaller. Chromium(III)-doped oxide phosphors, which emit near-infrared (NIR) light, have recently been used in small electronic devices. In this work, mesoporous silica nanoparticles were used as nanocarriers. The nanophosphor ZnGa2 O4 :Cr3+ ,Sn4+ formed in the mesopore after sintering. Good dispersity and morphology were performed with average diameters of 71±7 nm. It emitted light at 600-850 nm; the intensity was optimized by tuning the doping ratio of Cr3+ and Sn4+ . Meanwhile, the light conversion efficiency increased from 7.8 % to 37 % and the molar concentration increased from 0.125 m to 0.5 m. The higher radiant flux of 3.3 mW was obtained by operating an input current of 45 mA. However, the NIR nanophosphor showed good performance on mini light-emitting diode chips.

Broadband Cr3+ , Sn4+ -Doped Oxide Nanophosphors for Infrared Mini Light-Emitting Diodes.

Thermal conductivity enhancement of a sodium acetate trihydrate–potassium chloride–urea/expanded graphite composite phase–change material for latent heat thermal energy storage

Double-site emission of Eu2+ ions in Sr4Al14O25: Eu2+ phosphors for self-calibrated optical thermometry

Synthesis, characterization and spectroscopic properties of some rare earth activated LiAlO2 phosphor

Since precise control of nanoscale features is in high demand, it is being exploited to develop and improve OSL dosimetric materials, where striking improvement might also be expected in lanthanide-doped metal halides. The major challenge in the development of a nanophosphor lies in avoiding the aggregation of a dopant element in host materials, which has long prevented an in-depth exploration for the same purpose. This study focuses on the synthesis and characterization of Sm-doped KCl nanophosphors to develop a novel accession to investigate the highly sensitive trivalent Sm-doped KCl phosphor. Herein, we were able to overcome the aggregation phenomena and we showed that Sm-doped KCl with 0.45 mol% of Sm, which is the optimised dopant concentration, exhibits the high-intensity luminescence performance under blue light stimulation for the gamma doses in the range from 100 mGy to 1000 Gy. This sensitivity is attributed to the uniform nanospheres encapsulated in KCl along with the predominant existence of a trivalent (Sm3+) state, where these conditions can introduce additional defects centres. The presence of these additional defect centres was confirmed by photoluminescence studies, plausibly supporting the charge transfer due to the optical energy between these states, leading to high sensitivity. To establish KCl:Sm as a good OSL dosimetric materials (DM), we investigated fading, reusability, and reproducibility and compared these with those of commercial DM compounds such as Al2O3:C and BeO. Overall, Sm-doped KCl is non-toxic, cost-effective, robust, and a promising candidate for reusable dosimetry.

/pdf/facile-synthesis-of-kcl-sm3-nanophosphor-as-a-new-osl-l9fqlbx43s.pdf

Facile synthesis of KCl:Sm3+ nanophosphor as a new OSL dosimetric material achieved through charge transfer between the defect states

Temperature-dependent OSL properties of nano-phosphors LiAlO2:C and α-Al2O3:C

Design optimisation of C ion implantation of α-Al2O3 for medical dosimetry

The present paper reports the structural, morphological and optical properties of nanophosphor Li3B7O12:Mn with an optimised dopant concentration of 025 mol% and its surface modification under the irradiation of 250 keV proton beams and gamma photons for ion fluence ranging from 1 × 1013 to 625 × 1015 ions cm-2 and doses from 100 mGy-100 Gy, respectively This nanophosphor has been synthesised by the high temperature solid state reaction method Its optical properties are characterised by optically stimulated luminescence (OSL) and thermo luminescence (TL) techniques This nanophosphor is polycrystalline in nature with a grain size of 40-80 nm confirmed by x-ray diffraction (XRD) and transmission electron microscopy (TEM) The OSL decay and TL glow curve response of the proton beam irradiated samples exhibit significant intensity at a fluence of 25 × 1014 ions cm-2 Moreover, Li3B7O12:Mn displays a linear response for gamma doses in the range of 100 mGy-50 Gy We have also investigated the reusability and reproducibility of this material The above study demonstrates that Li3B7O12:Mn is a robust and promising candidate for medical proton dosimetry

https://iopscience.iop.org/article/10.1088/1361-6498/aae002/pdf

Synthesis of OSL nanophosphor Li3B7O12:Mn and its dosimetric properties.

Properties optimization of temperature dependence of nanophosphor KCl:Sm3+ for radiation dosimetry

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