Patent ID: 9537059
Date: 2017-01-03
CPC Classifications: B82Y,C09K,H01L,Y10S

Claim:
1. A method for producing a luminescent nano particle based luminescent material, the method comprising: mixing coated luminescent nano particles, a second coating precursor system, and optionally a surfactant in a liquid; and heating the thus obtained mixture, wherein the luminescent nano particles are selected from the group consisting of semiconductor nano particles that are able to emit in the visible part of the spectrum, wherein the coated luminescent nano particles comprise a first coating comprising a first coating material, being different from the semiconductor material of the nano particles, wherein the first coating material is selected from the group consisting of M1 wherein the second coating precursor system comprises one or more precursors for forming a second coating on the coated luminescent nano particles, the second coating comprising a second coating material, being different from the first coating material, wherein the second coating material is selected from the group consisting of M4A,