Abstract: Compositions of matter, downconversion layers including the compositions of matter, and devices including the compositions of matter are described. In an embodiment, the compositions of matter are downconversion materials configured to absorb a quantum of energy of a first energy and, in response, emit two or more quanta of energy of a second energy less than the first energy. Methods of making and depositing downconversion materials are also described. Downconversion precursor mixtures suitable for making downconversion materials and methods of making the same are also described.

Abstract: The present disclosure features a luminescent solar concentrator, including a layer including a quantum-cutting material; and a layer including a broadly light-absorbing material (that is also photoluminescent) optically coupled to and beneath the layer including the quantum-cutting material, relative to a light source.

Abstract: The present disclosure describes luminescent solar concentrators that include photoluminescent nanoparticles. The photoluminescent nanoparticles include a semiconductor nanocrystal that sensitizes the luminescence of a defect. The defect can include, for example, an atom, a cluster of atoms, or a lattice vacancy. The defect can be incorporated into the semiconductor nanocrystal, adsorbed onto, or otherwise associated with the surface of the semiconductor nanocrystal.

Abstract: The present disclosure describes luminescent solar concentrators that include photoluminescent nanoparticles. The photoluminescent nanoparticles include a semiconductor nanocrystal that sensitizes the luminescence of a defect. The defect can include, for example, an atom, a cluster of atoms, or a lattice vacancy. The defect can be incorporated into the semiconductor nanocrystal, adsorbed onto, or otherwise associated with the surface of the semiconductor nanocrystal.

Abstract: The present disclosure describes luminescent solar concentrators that include photoluminescent nanoparticles. The photoluminescent nanoparticles include a semiconductor nanocrystal that sensitizes the luminescence of a defect. The defect can include, for example, an atom, a cluster of atoms, or a lattice vacancy. The defect can be incorporated into the semiconductor nanocrystal, adsorbed onto, or otherwise associated with the surface of the semiconductor nanocrystal.

Abstract: The provided method includes photoelectrodeposition of an electrocatalyst onto a semiconductor to form a photoanode. The method yields composite photoanodes showing enhancement of photocurrent (water splitting rate) when incorporated into a photoelectrochemical cell for water electrolysis.

Abstract: A composition is provided comprising a host material and a luminescent dopant. The composition exhibits dual luminescent emission peaks, one each for the host material and the luminescent dopant. The intensity of the emission peaks vary in intensity as a result of the changing temperature of the composition. This quality enables the composition to be used for ratiometric optical thermometry, including exemplary applications, such as in situ temperature sensing.