A stabilized fluoride phosphor for light emitting diode (LED) applications includes a particle comprising manganese-activated potassium fluorosilicate and an inorganic coating on each of the particles. The inorganic coating comprises a silicate. A method of making a stabilized fluoride phosphor comprises forming a reaction mixture that includes particles comprising a manganese-activated potassium fluorosilicate; a reactive silicate precursor; a catalyst; a solvent; and water in an amount no greater than about 10 vol. %. The reaction mixture is agitated to suspend the particles therein. As the reactive silicate precursor undergoes hydrolysis and condensation in the reaction mixture, an inorganic coating comprising a silicate is formed on the particles. Thus, a stabilized fluoride phosphor is formed.

A stabilized fluoride phosphor for light emitting diode (LED) applications includes a particle comprising manganese-activated potassium fluorosilicate and an inorganic coating on each of the particles. The inorganic coating comprises a silicate. A method of making a stabilized fluoride phosphor comprises forming a reaction mixture that includes particles comprising a manganese-activated potassium fluorosilicate; a reactive silicate precursor; a catalyst; a solvent; and water in an amount no greater than about 10 vol. %. The reaction mixture is agitated to suspend the particles therein. As the reactive silicate precursor undergoes hydrolysis and condensation in the reaction mixture, an inorganic coating comprising a silicate is formed on the particles. Thus, a stabilized fluoride phosphor is formed.

Described herein are compositions and methods relating to luminescent structures.

Disclosed herein are embodiments of a composition comprising at least three layers. Layers one and two each either comprises a sensitizer or an emitter, typically a metal ion or a dye, and the third layer may or may not comprise a sensitizer or emitter. Upon exposure to light, such as infrared light, the composition produces visible and/or UV light. The composition may further comprise a capping moiety, a therapeutic agent, an uptake enhancer, a detection moiety that binds to a desired target, a quenching moiety, or a combination thereof. The composition may be a particle, such as a nanoparticle, or it may be a planar composition. Also disclosed are embodiments of a method for using the composition, including, but not limited to, a method for delivering a therapeutic agent, or a method for detecting a target, such as a biological target.

A method for producing a nitride fluorescent material having high emission luminance can be provided. The method includes heat-treating a raw material mixture containing silicon nitride, silicon, an aluminium compound, a calcium compound, and a europium compound.

A method for producing a nitride fluorescent material having high emission luminance can be provided. The method includes heat-treating a raw material mixture containing silicon nitride, silicon, an aluminum compound, a calcium compound, and a europium compound.

Halide perovskite compounds comprising at least one metal cation, at least one halide anion, and at least one alkali metal-bound crown ether, such as (crown ether@A).sub.2M(IV)X.sub.6, (crown ether@A)M(II)X.sub.4, or (crown ether@A)M(III)X.sub.5 (A=alkali metal cation, M=metal cation, X=halide anion), such as (18C6@K).sub.2HfBr.sub.6, (18C6@K).sub.2ZrCl.sub.4Br.sub.2, (18C6@Ba)MnBr.sub.4, and (18C6@Ba)SbCl.sub.5 are provided. Methods of generating such halide perovskite compounds are also provided. The halide perovskite compounds provided herein can have improved photoluminescence quantum yield (PLQY), improved tunability, improved purity, and/or improved stability relative to available halide perovskite compounds such as alkali metal cation vacancy-ordered perovskites.

A method for producing a nitride fluorescent material having high emission luminance can be provided. The method includes heat-treating a raw material mixture containing silicon nitride, silicon, an aluminium compound, a calcium compound, and a europium compound.

Optically active devices and processes for preparing such devices are disclosed. A device in accordance with the present disclosure comprises a patterned surface, wherein the patterned surface comprises a plurality of pattern elements, and a plurality of LED light sources each optically coupled and/or radiationally connected to at least one pattern element of the plurality of pattern elements. The plurality of pattern elements comprise at least one optically active material and a photoresist material.

Active emissive layers (e.g., of a light-emitting electrochemical cell (LEC)) are provided and can comprise zero-dimensional (0D) perovskite material in combination with a three-dimensional (3D) perovskite material, as well as electroluminescent devices (e.g., LECs) utilizing such active emissive layers and methods of fabricating and using such active emissive layers and electroluminescent devices. The 0D perovskite material can be incorporated into a matrix film of the 3D perovskite material. The 0D perovskite material can be, for example, perovskite nanocrystals (PNCs). The 0D perovskite material can be, for example, Cs.sub.4PbBr.sub.6, and the 3D perovskite material can be, for example, CsPbBr.sub.3.