The invention provides an optoelectronic device comprising a mixed-anion perovskite, wherein the mixed-anion perovskite comprises two or more different anions selected from halide anions and chalcogenide anions. The invention further provides a mixed halide perovskite of the formula (I) [A][B][X].sub.3 wherein: [A] is at least one organic cation; [B] is at least one divalent metal cation; and [X] is said two or more different halide anions. In another aspect, the invention provides the use of a mixed-anion perovskite as a sensitizer in an optoelectronic device, wherein the mixed-anion perovskite comprises two or more different anions selected from halide anions and chalcogenide anions. The invention also provides a photosensitizing material for an optoelectronic device comprising a mixed-anion perovskite wherein the mixed-anion perovskite comprises two or more different anions selected from halide anions and chalcogenide anions.

The invention provides an optoelectronic device comprising a mixed-anion perovskite, wherein the mixed-anion perovskite comprises two or more different anions selected from halide anions and chalcogenide anions. The invention further provides a mixed halide perovskite of the formula (I) [A][B][X].sub.3 wherein: [A] is at least one organic cation; [B] is at least one divalent metal cation; and [X] is said two or more different halide anions. In another aspect, the invention provides the use of a mixed-anion perovskite as a sensitizer in an optoelectronic device, wherein the mixed-anion perovskite comprises two or more different anions selected from halide anions and chalcogenide anions. The invention also provides a photosensitizing material for an optoelectronic device comprising a mixed-anion perovskite wherein the mixed-anion perovskite comprises two or more different anions selected from halide anions and chalcogenide anions.

Organometal halide perovskites are provided as nanoparticles for the construction of efficient light harvesters in photovoltaic solar cells. Further provided are methods of manufacturing the nanoparticles and uses thereof.

Organometal halide perovskites are provided as nanoparticles for the construction of efficient light harvesters in photovoltaic solar cells. Further provided are methods of manufacturing the nanoparticles and uses thereof.

An organic-inorganic perovskite satisfying E.sub.T<E.sub.T1 and E.sub.S−E.sub.T≤0.1 eV has a high emission efficiency. E.sub.S represents the excited singlet energy level in emission of an inorganic component, E.sub.T represents the excited triplet energy level in emission of an inorganic component, E.sub.T1 represents the excited triplet energy level in emission of an organic component.

An organic-inorganic perovskite satisfying E.sub.T<E.sub.T1 and E.sub.S−E.sub.T≤0.1 eV has a high emission efficiency. E.sub.S represents the excited singlet energy level in emission of an inorganic component, E.sub.T represents the excited triplet energy level in emission of an inorganic component, E.sub.T1 represents the excited triplet energy level in emission of an organic component.

Metal halide perovskite crystals, composite materials that include metal halide perovskite crystals and a polymeric matrix material, devices that include metal halide perovskite crystals, and methods of forming metal halide perovskite crystals, composite materials, and devices. The devices may include optoelectronic devices, such as light-emitting diodes. The light-emitting diodes may emit red light.

Metal halide perovskite crystals, composite materials that include metal halide perovskite crystals and a polymeric matrix material, devices that include metal halide perovskite crystals, and methods of forming metal halide perovskite crystals, composite materials, and devices. The devices may include optoelectronic devices, such as light-emitting diodes. The light-emitting diodes may emit red light.

The present disclosure relates to a composition that includes a perovskite of A.sub.2BX.sub.4, where A includes an R-form of a chiral molecule of at least one of

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and/or an S-form of the chiral molecule, B includes a cation, X includes an anion, R.sub.1 includes a first carbon chain having between 2 and 5 carbon atoms, R.sub.2 includes at least one of a hydrogen atom, a halogen atom, a carboxylic acid group, an alkoxy group, and/or a second carbon chain, and R.sub.3 includes a third carbon chain.

The present disclosure relates to a composition that includes a perovskite of A.sub.2BX.sub.4, where A includes an R-form of a chiral molecule of at least one of

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and/or an S-form of the chiral molecule, B includes a cation, X includes an anion, R.sub.1 includes a first carbon chain having between 2 and 5 carbon atoms, R.sub.2 includes at least one of a hydrogen atom, a halogen atom, a carboxylic acid group, an alkoxy group, and/or a second carbon chain, and R.sub.3 includes a third carbon chain.