A method for obtaining a salt with a general formula: R.sub.xNI, wherein: R.sub.xN is an organic cation (R.sub.xN.sup.+), R represents substituents (R−) independently selected from a group consisting of organic substituents: R.sup.1−, R.sup.2—, R.sup.3— and hydrogen (H—), x is a number of the substituents R— directly linked with the nitrogen (N) atom in the organic cation R.sub.xN.sup.+, wherein x is 3 or 4, I is an iodide anion (I.sup.−). The method comprises: preparing a reaction mixture comprising the steps of: synthesizing hydrogen iodide (HI) in situ by mixing molecular iodine (I.sub.2) with formic acid (COOH) in a molar ratio of molecular iodine (I.sub.2): formic acid (COOH) of no less than 1.01:1, in a solvent medium, introducing into the solvent medium a compound being a donor of organic cation R.sub.xN.sup.+ in an amount providing the molar ratio of the donor of organic cation R.sub.xN.sup.+: molecular iodine (I.sub.2) of no less than 1.01:1, and maintaining the reaction mixture at a temperature of not less than 20° C. for the time necessary to obtain the reaction product being the salt with the general formula R.sub.xNI. The obtained product is a substrate for synthesis of perovskites.

Embodiments relate to methods of forming a halide perovskite crystal. The method involves dispersing a halide perovskite material exhibiting a perovskite crystallographic lattice into a solution. The solution can include amine and a volatile solvent. The method involves forming a metastable intermediate state via amine molecules inserting into the perovskite crystallographic lattice. The method involves transitioning the perovskite material to a photo-sensitive phase via escape of the amine molecules from the perovskite crystallographic lattice. The method involves transitioning the metastable intermediate state to a halide perovskite crystal film.

The present disclosure pertains to a color filter for a display device, which has at least one color filter element for generating a predefined color in response to incident light, wherein the at least one color filter element includes a Perovskite material.

The present disclosure pertains to a color filter for a display device, which has at least one color filter element for generating a predefined color in response to incident light, wherein the at least one color filter element includes a Perovskite material.

Disclosed are chelates resulting from the complexation of bifunctional do2pa derivatives ligands of formula (I), wherein the substituents R.sup.1, R.sup.1′, R.sup.2, R.sup.2′, R.sup.3, R.sup.3′, L.sup.1, L.sup.1′, L.sup.2 and L.sup.2′ are defined as in the claims, with metallic cations, especially Pb(II) and Bi(III). Also disclosed are bifunctional do2pa derivatives ligands of formula (I), as well as the use of chelates in nuclear medicine and the use of ligands in cations detection or epuration of effluents.

##STR00001##

Disclosed are chelates resulting from the complexation of bifunctional do2pa derivatives ligands of formula (I), wherein the substituents R.sup.1, R.sup.1′, R.sup.2, R.sup.2′, R.sup.3, R.sup.3′, L.sup.1, L.sup.1′, L.sup.2 and L.sup.2′ are defined as in the claims, with metallic cations, especially Pb(II) and Bi(III). Also disclosed are bifunctional do2pa derivatives ligands of formula (I), as well as the use of chelates in nuclear medicine and the use of ligands in cations detection or epuration of effluents.

##STR00001##

Disclosed are processes for preparing hybrid perovskite quantum dots and the resulting hybrid perovskite quantum dots and uses thereof. Such quantum dots are useful as semiconductors in devices such as solar cells and light-emitting diodes.

Disclosed are processes for preparing hybrid perovskite quantum dots and the resulting hybrid perovskite quantum dots and uses thereof. Such quantum dots are useful as semiconductors in devices such as solar cells and light-emitting diodes.

A halide material having general formula ArMAX is disclosed. The halide material can be processed to an optoelectronic film with a halogenated formamidine and a lead halide, and the optoelectronic film can be applied in the manufacture of an optoelectronic device like a perovskite laser or a PeLED. Experimental data have proved that, the fabricated optoelectronic film shows a property of photoluminescence (PL) peak wavelength adjustable. Moreover, the PL peak wavelength moves from 482 nm to 534 nm with the increase of the content of lead (Pb), halogen (X) and formamidine (FA) in the optoelectronic film. Furthermore, experimental data have also indicated that, the fabricated optoelectronic film can be used as a blue emissive layer, a red emissive layer or a green emissive layer, thereby having a significant potential for application in optoelectronics industry.

A halide material having general formula ArMAX is disclosed. The halide material can be processed to an optoelectronic film with a halogenated formamidine and a lead halide, and the optoelectronic film can be applied in the manufacture of an optoelectronic device like a perovskite laser or a PeLED. Experimental data have proved that, the fabricated optoelectronic film shows a property of photoluminescence (PL) peak wavelength adjustable. Moreover, the PL peak wavelength moves from 482 nm to 534 nm with the increase of the content of lead (Pb), halogen (X) and formamidine (FA) in the optoelectronic film. Furthermore, experimental data have also indicated that, the fabricated optoelectronic film can be used as a blue emissive layer, a red emissive layer or a green emissive layer, thereby having a significant potential for application in optoelectronics industry.