公开(公告)号：US10266767B2

公开(公告)日：2019-04-23

申请号：US15234433

申请日：2016-08-11

Applicant: Cree, Inc.

Inventor： Brian T. Collins ,  Christopher P. Hussell ,  David T. Emerson ,  Ronan P. Le Toquin

IPC: C09K11/77 ,  C09K11/02 ,  C04B35/597 ,  C09K11/08 ,  C04B35/58 ,  C04B35/581 ,  C04B35/584 ,  C04B35/591 ,  C04B35/593

Abstract: A method is disclosed for forming a blended phosphor composition. The method includes the steps of firing precursor compositions that include europium and nitrides of at least calcium, strontium and aluminum, in a refractory metal crucible and in the presence of a gas that precludes the formation of nitride compositions between the nitride starting materials and the refractory metal that forms the crucible. The resulting compositions can include phosphors that convert frequencies in the blue portion of the visible spectrum into frequencies in the red portion of the visible spectrum.

公开(公告)号：US09447319B2

公开(公告)日：2016-09-20

申请号：US13714992

申请日：2012-12-14

Applicant: Cree, Inc.

Inventor： Iliya S. Todorov ,  Brian T. Collins

IPC: H05B33/14 ,  C09K11/77 ,  H05B33/12

CPC classification number: C09K11/7774 ,  H05B33/12

Abstract: A yellow phosphor having an increased activator concentration includes a host lattice comprising yttrium aluminum garnet (YAG) and an activator comprising cerium in the host lattice, where the cerium is present at a concentration of at least about 5 wt. % Ce. A method of making a yellow phosphor includes forming a reaction mixture comprising: a first precursor comprising cerium and oxygen; a second precursor comprising cerium and fluorine; a third precursor comprising yttrium; and a fourth precursor comprising aluminum. The reaction mixture is heated in a reducing environment at a temperature sufficient to form a yellow phosphor including a host lattice comprising yttrium aluminum garnet and an activator comprising cerium (Ce) incorporated in the host lattice.

Abstract translation: 具有增加的活化剂浓度的黄色磷光体包括包含钇铝石榴石（YAG）的主晶格和在主晶格中包含铈的活化剂，其中铈以至少约5重量％的浓度存在。 ％Ce。 制造黄色荧光体的方法包括形成反应混合物，其包含：包含铈和氧的第一前体; 包含铈和氟的第二前体; 包含钇的第三前体; 和包含铝的第四前体。 将反应混合物在还原环境中在足以形成黄色荧光体的温度下加热，该温度包括含有钇铝石榴石的主晶格和包含在主晶格中的铈（Ce）的活化剂。

公开(公告)号：US20140167600A1

公开(公告)日：2014-06-19

申请号：US13714992

申请日：2012-12-14

Applicant: CREE, INC.

Inventor： Iliya S. Todorov ,  Brian T. Collins

IPC: C09K11/77 ,  H05B33/12

CPC classification number: C09K11/7774 ,  H05B33/12

Abstract: A yellow phosphor having an increased activator concentration includes a host lattice comprising yttrium aluminum garnet (YAG) and an activator comprising cerium in the host lattice, where the cerium is present at a concentration of at least about 5 wt. % Ce. A method of making a yellow phosphor includes forming a reaction mixture comprising: a first precursor comprising cerium and oxygen; a second precursor comprising cerium and fluorine; a third precursor comprising yttrium; and a fourth precursor comprising aluminum. The reaction mixture is heated in a reducing environment at a temperature sufficient to form a yellow phosphor including a host lattice comprising yttrium aluminum garnet and an activator comprising cerium (Ce) incorporated in the host lattice.

Abstract translation: 具有增加的活化剂浓度的黄色磷光体包括包含钇铝石榴石（YAG）的主晶格和在主晶格中包含铈的活化剂，其中铈以至少约5重量％的浓度存在。 ％Ce。 制造黄色荧光体的方法包括形成反应混合物，其包含：包含铈和氧的第一前体; 包含铈和氟的第二前体; 包含钇的第三前体; 和包含铝的第四前体。 将反应混合物在还原环境中在足以形成黄色荧光体的温度下加热，该温度包括含有钇铝石榴石的主晶格和包含在主晶格中的铈（Ce）的活化剂。

公开(公告)号：US10756231B2

公开(公告)日：2020-08-25

申请号：US16267636

申请日：2019-02-05

Applicant: Cree, Inc.

Inventor： Thomas A. Kuhr ,  Robert David Schmidt ,  Daniel Carleton Driscoll ,  Brian T. Collins

IPC: H01L33/00 ,  H01L33/06 ,  H01L33/32 ,  H01L33/02

Abstract: Group III nitride based light emitting diode (LED) structures include multiple quantum wells with barrier-well units that include III nitride interface layers. Each interface layer may have a thickness of no greater than about 30% of an adjacent well layer, and a comparatively low concentration of indium or aluminum. One or more interface layers may be present in a barrier-well unit. Multiple barrier-well units having different properties may be provided in a single active region.

公开(公告)号：US20160348000A1

公开(公告)日：2016-12-01

申请号：US15234433

申请日：2016-08-11

Applicant: Cree, Inc.

Inventor： Brian T. Collins ,  Christopher P. Hussell ,  David T. Emerson ,  Ronan P. Le Toquin

IPC: C09K11/77 ,  C09K11/02 ,  C04B35/597 ,  C09K11/08

CPC classification number: C09K11/7734 ,  C04B35/58 ,  C04B35/581 ,  C04B35/584 ,  C04B35/591 ,  C04B35/593 ,  C04B35/5935 ,  C04B35/597 ,  C04B2235/3224 ,  C04B2235/3852 ,  C04B2235/3865 ,  C04B2235/3869 ,  C04B2235/3873 ,  C04B2235/445 ,  C09K11/025 ,  C09K11/0883 ,  C09K11/7728

Abstract: A method is disclosed for forming a blended phosphor composition. The method includes the steps of firing precursor compositions that include europium and nitrides of at least calcium, strontium and aluminum, in a refractory metal crucible and in the presence of a gas that precludes the formation of nitride compositions between the nitride starting materials and the refractory metal that forms the crucible. The resulting compositions can include phosphors that convert frequencies in the blue portion of the visible spectrum into frequencies in the red portion of the visible spectrum.

Abstract translation: 公开了一种形成混合荧光粉组合物的方法。 该方法包括以下步骤：在耐火金属坩埚中，并且在气体存在下，将包含至少钙，锶和铝的铕和氮化物的前体组合物焙烧，以防止在氮化物起始材料和耐火材料之间形成氮化物组合物 形成坩埚的金属。 所得组合物可以包括将可见光谱的蓝色部分中的频率转换成可见光谱的红色部分中的频率的磷光体。