公开(公告)号：US11286419B2

公开(公告)日：2022-03-29

申请号：US16320295

申请日：2017-07-31

Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA

Inventor： Clayton J. Cozzan ,  Steven P. DenBaars ,  Ram Seshadri

IPC: C09K11/02 ,  F21K9/64 ,  F21K9/68 ,  C04B35/10 ,  C04B35/44 ,  C04B35/645 ,  C09K11/77 ,  C04B35/117 ,  H01L33/50 ,  H05B33/20 ,  H01L31/055 ,  H05B33/14 ,  F21Y115/30 ,  F21Y115/10

Abstract: A method for fabricating a composite useful in a white light emitting device, includes mixing a phosphor and a filler to form a mixture; sintering the mixture (e.g., using spark plasma sintering) to form a composite; and annealing the composite to reduce oxygen vacancies and improve optical properties of the composite. Also disclosed is a white light emitting device including a laser diode or light emitting diode optically pumping the phosphor in the composite to produce white light. The composite fabricated using the method (and having. e.g., at most 50% phosphor by weight) can (1) reduce an operating temperature of the phosphor by 55 degrees, (2) increase an external quantum efficiency (e.g., by at least 15%) of the white light emitting device, and (3) result in color points and quality of the white light that is equal to or improved, as compared to without the filler.

公开(公告)号：US20190264100A1

公开(公告)日：2019-08-29

申请号：US16320295

申请日：2017-07-31

Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA

Inventor： Clayton J. Cozzan ,  Steven P. DenBaars ,  Ram Seshadri

IPC: C09K11/02 ,  F21K9/64 ,  F21K9/68 ,  C09K11/77 ,  C04B35/44 ,  C04B35/10 ,  C04B35/645

Abstract: A method for fabricating a composite useful in a white light emitting device, includes mixing a phosphor and a filler to form a mixture; sintering the mixture (e.g., using spark plasma sintering) to form a composite; and annealing the composite to reduce oxygen vacancies and improve optical properties of the composite. Also disclosed is a white light emitting device including a laser diode or light emitting diode optically pumping the phosphor in the composite to produce white light. The composite fabricated using the method (and having. e.g., at most 50% phosphor by weight) can (1) reduce an operating temperature of the phosphor by 55 degrees, (2) increase an external quantum efficiency (e.g., by at least 15%) of the white light emitting device, and (3) result in color points and quality of the white light that is equal to or improved, as compared to without the filler.