Scintillation Response Enhancement in Nanocrystalline Lead Halide Perovskite Thin Films on Scintillating Wafers.

Lead halide perovskite nanocrystals of the formula CsPbBr have recently been identified as potential time taggers in scintillating heterostructures for time-of-flight positron emission tomography (TOF-PET) imaging thanks to their ultrafast decay kinetics. This study investigates the potential of this material experimentally. We fabricated CsPbBr thin films on scintillating GGAG:Ce (GdCeGaAlO) wafer as a model structure for the future sampling detector geometry.

On the Role of CsPbBr Phase in the Luminescence Performance of Bright CsPbBr Nanocrystals.

CsPbBr nanocrystals have been identified as a highly promising material for various optoelectronic applications. However, they tend to coexist with CsPbBr phase when the reaction conditions are not controlled carefully. It is therefore imperative to understand how the presence of this phase affects the luminescence performance of CsPbBr nanocrystals We synthesized a mixed CsPbBr-CsPbBr sample, and compared its photo- and radioluminescence properties, including timing characteristics, to the performance of pure CsPbBr nanocrystals.

Non-Hygroscopic, Self-Absorption Free, and Efficient 1D CsCuI Perovskite Single Crystal for Radiation Detection.

A novel all-inorganic CsCuI single-crystalline perovskite as a nonhygroscopic and efficient X-ray and γ-ray scintillator is described herein. It is featured by a one-dimensional (1D) perovskite structure with an orthorhombic system and a space group of . The CsCuI crystal emits yellow light peaking at 570 nm originated from strongly localized 1D exciton emission.

Core-shell ZnO:Ga-SiO nanocrystals: limiting particle agglomeration and increasing luminescence surface defect passivation.

Heat treatment is needed to increase the luminescence intensity of ZnO:Ga particles, but it comes at the cost of higher particle agglomeration. Higher agglomeration results in low transparency of scintillating powder when embedded in a matrix and constitutes one of the biggest disadvantages, besides low light yield and low stopping power, of ZnO:Ga powder. Limiting ZnO:Ga particle size is therefore a key step in order to prepare highly luminescent and transparent composites with prospects for optical applications.

LuAG:Pr-porphyrin based nanohybrid system for singlet oxygen production: Toward the next generation of PDTX drugs.

A highly prospective drug for the X-ray induced photodynamic therapy (PDTX), LuAG:Pr@SiO-PpIX nanocomposite, was successfully prepared by a three step process: photo-induced precipitation of the LuAlO:Pr (LuAG:Pr) core, sol-gel technique for amorphous silica coating, and a biofunctionalization by attaching the protoporphyrin IX (PpIX) molecules. The synthesis procedure provides three-layer nanocomposite with uniform shells covering an intensely luminescent core. Room temperature radioluminescence (RT RL) spectra as well as photoluminescence (RT PL) steady-state and time resolved spectra of the material confirm the non-radiative energy transfer from the core Pr ions to the PpIX outer layer.