Centre National De La Recherche Scientifique

Aledia

Université Clermont Auvergne

Sigma Clermont

Other

Geneviève Chadeyron

Abdelhay Aboulaich

Rachid Mahiou

Jérôme Deschamps

Rodolphe Deloncle

Damien Boyer

Anthony Barros

Philippe Boutinaud

A sol-gel process for synthesizing a luminescent material has a general formulation: AxByFz:Mn. A is an element of group 1, 2, 4, NRor a combination of elements belonging to those groups, with R&#x2550;H or an alkyl chain or a combination of chains. B is an element of group 5, 6, 13, 14 and 0&#x3c;x&#x2264;5, 0&#x3c;y&#x2264;2, 5&#x2264;z&#x2264;7. The sol-gel process includes a) producing a liquid precursor () in an alcohol solution by mixing metal reagents () with manganese, the mixture being made at pH&#x3c;8; b) obtaining a solid precursor () from the liquid precursor () obtained in step a), by eliminating () the solvent; c) crystallizing () the solid precursor () obtained in step b) by thermal treatment in fluorinated atmosphere; and d) retrieving the fluorescent crystalline powder () obtained at an end of step c).

Sol-gel process for synthesising a luminescent material with general formulation: AxByFz:Mn

A method of manufacturing nanoparticles of a photoluminescent material, including the successive steps of: a) forming nanometer-range particles of said photoluminescent material; b) forming a dispersion containing the particles in a non-aqueous solvent, the dispersion further containing at least one surface agent; c) placing the dispersion in an autoclave at a pressure in the range from 2 MPa to 100 MPa; and d) recovering the particles.

Method for producing photoluminescent particles

A method for producing a photo-luminescent material, including the following steps: (1) producing, according to a sol-gel method, a sol and then a gel of first precursors of a first substance from the sol; (2) crushing the gel; (3) optionally, annealing the gel in order to form first particles of the first substance of which the average size is between 1 pm and 20 um; (4) producing a colloidal dispersion of second particles of a second substance, different from the first substance or identical to the first substance, of which the average size is between 5 nm and 400 nm; (5) mixing the colloidal dispersion with the sol in step (1) before forming the gel or with the first particles after step (3); and (6) annealing the mixture obtained in step (5), resulting in an increase in the compactness of the mixture, the average size of the second particles after annealing being between 100 nm and 900 nm. A photo-luminescent material including a mixture of first particles of a first photo-luminescent substance of which the average size is between 1 pm and 20 pm and second particles of a second photo-luminescent substance, different from the first photo-luminescent substance or identical to the first photo-luminescent substance, of which the average size is between 100 nm and 900 nm.

Method for producing a photo-luminescent material

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Cebazat, France

Geneviève Chadeyron