Excitation Management of Lead-Free Perovskite Nanocrystals Through Doping.

Despite their low toxicity and phase stability, lead-free double perovskite nanocrystals, CsAgInCl in specific, have suffered from low quantum yield of photoluminescence. This is mainly due to two reasons, including (i) the quenching effect from metal silver which was usually formed at high temperature from Ag reduction in the presence of organic amines and (ii) the parity-forbidden transition of pristine double perovskites. Here, we reported a room-temperature synthesis of CsAgInCl nanocrystals in an inverse microemulsion system, where Ag reduction was largely suppressed.

Ultra-stable CsPbBr Perovskite Nanosheets for X-Ray Imaging Screen.

Wet chemistry methods, including hot-injection and precipitation methods, have emerged as major synthetic routes for high-quality perovskite nanocrystals in backlit display and scintillation applications. However, low chemical yield hinders their upscale production for practical use. Meanwhile, the labile nature of halide-based perovskite poses a major challenge for long-term storage of perovskite nanocrystals.

Annealing effect on mono-mode refractive index enhanced RbTiOPO4 waveguides formed by ion implantation.

We reported on the annealing features of the RbTiOPO4 planar waveguides fabricated by 6.0 MeV C3+ ion implantation. The thermal stability of the ion-implanted RbTiOPO4 waveguide was investigated by annealing at different temperatures ranging from 260 degrees C to 650 degrees C.

Optical waveguide in stoichiometric lithium niobate formed by 500 keV proton implantation.

We report on the fabrication of planar waveguide in stoichiometric lithium niobate by 500 keV proton implantation with a dose of 1x10(17) ions/cm(2). The formation of n(e) enhancement planar waveguide in the crystal was disclosed by the dark mode spectra and the subsequent endface coupling measurement. The absorption spectra show that the postannealing treatments above 400 masculineC temperature can remove the color centers induced by implantation efficiently.