Abstract: A system may include a first emitter that includes a first mixed halide perovskite film that includes a first type mixed halide perovskite material that possesses a first usable photoemission wavelength range. The system may include a first excitation device that is positioned adjacent to the mixed halide perovskite film based on an excitation mode of the first excitation device. The first excitation device is configured to tune, based on a first instruction, the first mixed halide perovskite film to emit a first photoemission peak within the first usable photoemission wavelength range, and tune, based on a second instruction, the first mixed halide perovskite film to emit a second photoemission peak within the first usable photoemission wavelength range. The second photoemission peak has at least one of a different width or center within the first usable photoemission wavelength range than the first photoemission peak.

Abstract: Particular embodiments described herein provide for a battery that includes a zinc anode, a manganese cathode, and an electrolyte. The electrolyte includes an acetate and a sulfate. In some examples, the acetate to sulfate ratio is about 1:1.

Abstract: A system may include a first emitter that includes a first mixed halide perovskite film that includes a first type mixed halide perovskite material that possesses a first usable photoemission wavelength range. The system may include a first excitation device that is positioned adjacent to the mixed halide perovskite film based on an excitation mode of the first excitation device. The first excitation device is configured to tune, based on a first instruction, the first mixed halide perovskite film to emit a first photoemission peak within the first usable photoemission wavelength range, and tune, based on a second instruction, the first mixed halide perovskite film to emit a second photoemission peak within the first usable photoemission wavelength range. The second photoemission peak has at least one of a different width or center within the first usable photoemission wavelength range than the first photoemission peak.

Abstract: Compositions comprise a perovskite and a non-perovskite. Perovskites comprise AxA?yA?(1?x?y)BX3, and non-perovskites may comprise A?, B and X, where A is a first cation, A? is a second cation, A? is a third cation, B is a fourth cation, X is an anion. In some instances, A, A?, and A? are each independently (NH2)2CH+, CH3NH3+, Cs+, Rb+, or (NH2)2(C?NH2)+, with the proviso that A, A?, and A? are each different. The perovskite may have a first crystal structure in which the anion is corner-sharing, the non-perovskite may have a second crystal structure comprising at least one of an orthorhombic structure, a hexagonal structure, or a perovskite-like structure, and 1?x?y may be greater than about 0.15.

Abstract: A feeding device especially for facilitating the transition from non-oral tube feeding to oral feeding is disclosed. The device comprises a fluid reservoir-having a fluid outlet, a nipple having a fluid outlet, a conduit for conveying fluid from the reservoir to the nipple fluid outlet and a manually adjustable valve that includes a manually settable selector to control the flow of fluid through the conduit and to vary it from zero flow to substantial flow. The device may include a shield associated with the nipple.