Highly crystalline nanoscale phosphor particles and composite materials incorporating the particles
First Claim
1. A collection of particles comprising a crystalline phosphor composition, the collection of particles having a number average primary particle size of no more than about 100 nm, a weight average secondary particle size of no more than about 250 nm and an crystallinity of at least about 90%.
1 Assignment
0 Petitions
Accused Products
Abstract
Collections of phosphor particles have achieved improved performance based on improved material properties, such as crystallinity. Display devices can be formed with these improved submicron phosphor particles. Improved processing methods contribute to the improved phosphor particles, which can have high crystallinity and a high degree of particle size uniformity. Dispersions and composites can be effectively formed from the powders of the submicron particle collections.
19 Citations
17 Claims
- 1. A collection of particles comprising a crystalline phosphor composition, the collection of particles having a number average primary particle size of no more than about 100 nm, a weight average secondary particle size of no more than about 250 nm and an crystallinity of at least about 90%.
-
13. A method for the production of particles in a flowing reactor, the method comprises reacting a reactant flow to generate product particles within the flow in which the reactant flow comprises a heated aerosol wherein the heated aerosol is heated to a temperature at least about 10°
- C. greater than ambient temperature.
- View Dependent Claims (14, 15)
-
16. A method for processing a collection of inorganic phosphor particles having an average particle size no more than about 250 nm, the method comprising heating the particle collection at a first temperature from about 250°
- C. to about 600°
C. for 5 minutes to about five hours in an oxidizing atmosphere and a heating the particle collection in a reducing atmosphere for about 5 minutes to about 48 hours at a second temperature above the first temperature and sufficient to anneal the crystal structure of the particles while being at least above the transformation onset temperature of a desired phase and at least 100°
C. below the melting temperature of the particles. - View Dependent Claims (17)
- C. to about 600°
Specification