NOVELTY - Quantum dot particle (I) on the micron or nanometer scale comprises: many quantum dot-dielectric particle complexes, in which each quantum dot-dielectric particle complex comprises many quantum dots and a dielectric particles on the micron or nanometer scale, where the quantum dot complexes are absorbed onto the surface of the dielectric particles, and the quantum dot-dielectric particle complexes form an aggregate on the micron or nanometer scale.    USE - The quantum dot particle is useful in: a powdered quantum dots; and an optoelectronic device/a photoluminescent device (all claimed), including e.g. solar cells (for producing electricity), photodiodes (for turning devices on and off in either the presence or absence of light), LEDs and organic-LEDs.    ADVANTAGE - The quantum dot particle: is coated with a dielectric layer to protect the quantum dots from photo-oxidation as well as to allow the quantum dots to be compatible with agents that are used to form silicone materials; forms the powdered quantum dots which are capable of being used in place of convention phosphors materials in applications; can be substantially impermeable to oxygen and moisture as well as to be able to resist degradation under illumination and the chemical and temperature conditions of the surrounding environment; and is electronically and chemically stable with a high luminescent quantum yield.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) making many quantum dot particles (I) comprising: (a) providing a dispersion of quantum dots and dielectric nano- or micro-particles in a solvent to form aggregates of many quantum dot-dielectric particle complexes, where each of the quantum dot-dielectric particle complexes comprising many quantum dots absorbed onto the surface of a dielectric particle; and (b) separating the aggregates of the quantum dot-dielectric particle complexes from the solvent;    (2) a quantum dot particle (II) on the micron or nanometer scale comprising: a quantum dot-crosslinked silane complex, where many quantum dots are dispersed in a crosslinked silane matrix to form the complex, and the complex is a particle on the micron or nanometer scale;    (3) making many quantum dot particles (II) comprising: (a1) providing quantum dots, each quantum dot having surfactant attached to the outer surface; and (b1) displacing the surfactant on the outer surfaces of the quantum dots with a silane, where the silane is in a solution; (c1) cross-linking the silane on the quantum dots and the silane in the solution to form many quantum dot-crosslinked silane complexes, each of the quantum dot-crosslinked silane complexes comprising many quantum dots dispersed in a crosslinked silane matrix; and (d1) separating the quantum dot-crosslinked silane complexes from the solution; and    (4) an optoelectronic device/a photoluminescent device, each comprising a composite comprising many quantum dot particles (I) or (II) dispersed in a silicone material.    DESCRIPTION OF DRAWING(S) - The figure shows a quantum dot.    Core (10)    Outer surface of core (21)    Metal layer (23)    Shell (150)