Design of a High-Performance Near-Infrared Scintillator through Metal-Atom Substitution in Metal Chalcogenide.

We report the synthesis and optical characterization of a series of metal chalcogenides, ASiSTe (A = Sr, Ba, Eu), highlighting the metal-atom substitution strategy for the discovery of a high-performance metal chalcogenide-based near-infrared (NIR) scintillator of EuSiSTe. EuSiSTe exhibits exceptionally broad NIR emission with a full width at half-maximum of 210 nm, the largest among all known Eu-based NIR emitters. EuSiSTe has a high light yield of 41697 photons/MeV and excellent resistance to hygroscopicity.

Manipulation of Shallow-Trap States in Halide Double Perovskite Enables Real-Time Radiation Dosimetry.

Storage phosphors displaying defect emissions are indispensable in technologically advanced radiation dosimeters. The current dosimeter is limited to the passive detection mode, where ionizing radiation-induced deep-trap defects must be activated by external stimulation such as light or heat. Herein, we designed a new type of shallow-trap storage phosphor by controlling the dopant amounts of Ag and Bi in the host lattice of CsNaInCl.

IBIL Measurement and Optical Simulation of the D Center in 4H-SiC.

In this paper, D defects are studied via experiments and calculations. The 2 MeV H is used to carry on an ion-beam-induced luminescence (IBIL) experiment to measure the in-situ luminescence of untreated and annealed 4H-SiC at 100 K. The results show that the luminescence intensity decreases rapidly with increasing H fluence, which means the losses of optical defect centers.

Mechanically Robust Irradiation, Atomic Oxygen, and Static-Durable CrO/CuNi Coatings on Kapton Serving as Space Station Solar Cell Arrays.

The polymers that served for solar cell arrays are constantly subject to various hazards, such as atomic oxygen (AO), ion irradiation, or electrostatic discharge (ESD) events. To address these issues, we fabricated and sifted CrO/CuNi-coated Kapton with a gradient structure with the goal of reaching an equilibrium between AO durability and resistance. The resulting material exhibits an impressively low of 6.

Tribological Behaviors of Super-Hard TiAlN Coatings Deposited by Filtered Cathode Vacuum Arc Deposition.

High hardness improves the material’s load-bearing capacity, resulting in the enhancement of tribological properties. However, the high hardness is difficult to achieve for TiAlN coating due to the transformation of the close-packed structure from cubic to hexagonal and the increase in the grain size when the Al content is high. In the present study, the ultrahard TiAlN coatings (hardness > 40 GPa) are successfully developed by filtered cathodic vacuum arc technology to study the effect of nitrogen flux rate on tribological behaviors.

Atomic-Oxygen-Durable and Antistatic α-AlTiO/γ-NiCr Coating on Kapton for Aerospace Applications.

Polymers used for the exteriors of spacecraft are always exposed to risks such as atomic oxygen (AO) or electrostatic discharge (ESD) degradation. In this work, an AlTiO/NiCr coating with excellent mechanical stability, AO durability, and electrostatic dissipative properties was deposited via ion implantation (IIP), filter cathode vacuum arc (FCVA), and high-power impulse magnetron sputtering (HiPIMS) on a flexible Kapton substrate. Scratch and cycle folding tests indicated good adhesion and toughness of the AlTiO/NiCr-coated Kapton, which were due to the gradient structure fabricated by the multitechnology combination.