Cree Gmbh

Creeled, Inc.

Kenneth Lotito

Ryan Gresback

Linjia Mu

Paul Thomas Fini

Ceri Griffiths

Bernd P Keller

James Ibbetson

A stabilized fluoride phosphor for light emitting diode (LED) applications includes a particle comprising manganese-activated potassium fluorosilicate and an inorganic coating on each of the particles. The inorganic coating comprises a silicate. A method of making a stabilized fluoride phosphor comprises forming a reaction mixture that includes particles comprising a manganese-activated potassium fluorosilicate; a reactive silicate precursor; a catalyst; a solvent; and water in an amount no greater than about 10 vol. %. The reaction mixture is agitated to suspend the particles therein. As the reactive silicate precursor undergoes hydrolysis and condensation in the reaction mixture, an inorganic coating comprising a silicate is formed on the particles. Thus, a stabilized fluoride phosphor is formed.

Stabilized fluoride phosphor for light emitting diode (LED) applications

A stabilized quantum dot composite includes a plurality of luminescent semiconducting nanoparticles embedded in a matrix comprising an ionic metal oxide. A method of making a stabilized quantum dot composite includes forming a mixture comprising a plurality of luminescent semiconducting nanoparticles dispersed in an aqueous solution comprising an ionic metal oxide. The mixture is dried to form a stabilized quantum dot composite comprising the plurality of luminescent semiconducting nanoparticles embedded in a matrix comprising the ionic metal oxide.

Stabilized quantum dot composite and method of making a stabilized quantum dot composite

Stabilized luminescent nanoparticles for light emitting diode applications comprise perovskite nanocrystals encapsulated by an oxide coating, where the oxide coating includes ligand remnants comprising one or more elements selected from the group consisting of: nitrogen, carbon, phosphorus, and sulfur. A method of making the stabilized luminescent nanoparticles comprises dispersing perovskite nanocrystals and crosslinking ligands in a non-polar solvent to form a first mixture. Each of the crosslinking ligands comprises a head end and a tail end; the head ends attach to the perovskite nanocrystals and the tail ends remain unattached and available for crosslinking. An oxide precursor comprising crosslinking functional groups is added to the first mixture, and the crosslinking functional groups attach to the tail ends of the crosslinking ligands. Thus, an oxide coating is formed on the perovskite nanocrystals.

Stabilized luminescent nanoparticles comprising a perovskite semiconductor and method of fabrication

A light emitting device includes a light emitting diode ('LED'), a first luminescent material that is configured to emit light having an emission peak in a green wavelength range, and a second luminescent material that is configured to emit narrow-spectrum light having an emission peak in an orange wavelength range. A light output of the light emitting device, which includes a portion of the light emitted by the LED, the light having the emission peak in the green wavelength range, and the light having the emission peak in the orange wavelength range, provides an appearance of white light. Related devices are also discussed.

Light emitting devices including narrowband converters for outdoor lighting applications

A stabilized quantum dot structure for use in a light emitting diode (LED) comprises, according to one embodiment, a luminescent particle comprising one or more semiconductors, a buffer layer overlying the luminescent particle, where the buffer layer comprises an amorphous material, and a barrier layer overlying the buffer layer, where the barrier layer comprises oxygen, nitrogen and/or carbon. According to another embodiment, the stabilized quantum dot structure includes a luminescent particle comprising one or more semiconductors, and a treated buffer layer comprising amorphous silica overlying the luminescent particle, where the stabilized quantum dot structure exhibits a quantum yield of at least about 0.7 when exposed to a blue light flux of about 30 W/cmat a temperature of 80-85&#xb0; C. and relative humidity of 5% for 500 hours.

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Santa Barbara, CA, United States of America

Kenneth Lotito