公开(公告)号：US20200185572A1

公开(公告)日：2020-06-11

申请号：US16794414

申请日：2020-02-19

Applicant: Cree, Inc.

Inventor： Ryan Gresback ,  Kenneth Lotito ,  Linjia Mu

IPC: H01L33/50 ,  C09K11/61 ,  H01L33/00 ,  H01L33/44

Abstract: 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.

公开(公告)号：US10741730B2

公开(公告)日：2020-08-11

申请号：US15809213

申请日：2017-11-10

Applicant: Cree, Inc.

Inventor： Linjia Mu ,  Kenneth Lotito ,  Ryan Gresback

IPC: H01L33/50 ,  C09K11/66 ,  H01L51/50 ,  F21K9/20 ,  C09K11/02 ,  C09K11/61 ,  B82Y20/00 ,  B82Y40/00

Abstract: 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.

公开(公告)号：US20190341531A1

公开(公告)日：2019-11-07

申请号：US15972152

申请日：2018-05-05

Applicant: Cree, Inc.

Inventor： Fan Zhang ,  Ryan Gresback ,  James Ibbetson ,  Bernd Keller ,  Antony Paul Van de Ven

IPC: H01L33/50 ,  H01L33/08

Abstract: A solid state lighting device includes at least one electrically activated solid state light emitter configured to stimulate emissions of first through third lumiphoric materials having peak wavelengths in ranges of from 485 nm to 530 nm, from 575 nm to 595 nm, and from 605 nm to 640 nm, respectively (or subranges thereof defined herein), with the third peak having a full width half maximum value of less than 60 nm. The resulting device generates aggregated emissions having a suitably high color rendering index (e.g., CRI Ra) value (e.g., at least 70), and also having a spectral power distribution with a Melanopic/Photopic ratio within a specified target range as a function of correlated color temperature, thereby providing increased perceived brightness.

公开(公告)号：US10349484B1

公开(公告)日：2019-07-09

申请号：US15994483

申请日：2018-05-31

Applicant: Cree, Inc.

Inventor： Fan Zhang ,  Ryan Gresback ,  Antony Paul van de Ven ,  Robert Glass ,  Bernd P. Keller

IPC: H05B33/08 ,  H01L33/08 ,  H01L33/26 ,  A61N5/06 ,  A61M21/02 ,  H01L33/50 ,  A61M21/00

Abstract: Solid state lighting devices with melatonin suppression characteristics that ameliorate or reduce symptoms of circadian rhythm disorders or other health conditions. Aspects disclosed herein additionally relate to providing one or more of the foregoing effects while maintaining color rendering index (CRI) values acceptably high for the intended use, as well as providing lighting devices with high luminous efficacy and enhanced energy efficiency. A solid state lighting device includes one or more solid state emitters and one or more lumiphoric materials that provide aggregated emissions of the solid state lighting device. The aggregated emissions have a warm correlated color temperature (CCT) with a color point that is off of the blackbody locus (BBL) by a certain distance.

公开(公告)号：US10541353B2

公开(公告)日：2020-01-21

申请号：US15809353

申请日：2017-11-10

Applicant: Cree, Inc.

Inventor： Linjia Mu ,  Kenneth Lotito ,  Ryan Gresback

IPC: H01L33/50

Abstract: 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.

公开(公告)号：US20190148605A1

公开(公告)日：2019-05-16

申请号：US15809353

申请日：2017-11-10

Applicant: Cree, Inc.

Inventor： Linjia Mu ,  Kenneth Lotito ,  Ryan Gresback

IPC: H01L33/50

CPC classification number: H01L33/504 ,  H01L33/50 ,  H01L33/505 ,  H01L33/507

Abstract: 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.

公开(公告)号：US10608148B2

公开(公告)日：2020-03-31

申请号：US15994105

申请日：2018-05-31

Applicant: Cree, Inc.

Inventor： Ryan Gresback ,  Kenneth Lotito ,  Linjia Mu

IPC: C09K11/61 ,  H01L33/50 ,  H01L33/00 ,  H01L33/44

Abstract: 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.

公开(公告)号：US20190273189A1

公开(公告)日：2019-09-05

申请号：US16419261

申请日：2019-05-22

Applicant: Cree, Inc.

Inventor： Kenneth Lotito ,  Ryan Gresback ,  Ceri Griffiths ,  Paul Fini

IPC: H01L33/50 ,  C09K11/02 ,  F21K9/20 ,  F21K9/64

Abstract: 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.

公开(公告)号：US10347799B2

公开(公告)日：2019-07-09

申请号：US15809241

申请日：2017-11-10

Applicant: Cree, Inc.

Inventor： Kenneth Lotito ,  Ryan Gresback ,  Ceri Griffiths ,  Paul Fini

IPC: F21K9/20 ,  F21K9/64 ,  C09K11/02 ,  H01L33/50 ,  B82Y40/00 ,  B82Y20/00

Abstract: 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.

公开(公告)号：US20190148603A1

公开(公告)日：2019-05-16

申请号：US15809241

申请日：2017-11-10

Applicant: Cree, Inc.

Inventor： Kenneth Lotito ,  Ryan Gresback ,  Ceri Griffiths ,  Paul Fini

IPC: H01L33/50 ,  F21K9/64 ,  F21K9/20 ,  C09K11/02

CPC classification number: H01L33/502 ,  B82Y20/00 ,  B82Y40/00 ,  C09K11/025 ,  F21K9/20 ,  F21K9/64 ,  H01L51/502 ,  Y10S977/774 ,  Y10S977/892 ,  Y10S977/90 ,  Y10S977/95

Abstract: 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.