公开(公告)号：US11677050B2

公开(公告)日：2023-06-13

申请号：US17303376

申请日：2021-05-27

Applicant: NICHIA CORPORATION

Inventor： Makiko Iwasa ,  Kazuya Nishimata ,  Atsushi Yoshinari ,  Shoji Hosokawa ,  Masato Okawa ,  Yasuaki Mashima

IPC: H01L33/50 ,  F21K9/64 ,  C09K11/77 ,  F21Y115/10 ,  H01L33/62 ,  H01L51/50

CPC classification number: H01L33/504 ,  C09K11/77212 ,  C09K11/77348 ,  F21K9/64 ,  F21Y2115/10 ,  H01L33/62 ,  H01L51/502

Abstract: A light emitting device includes a light emitting element having a dominant wavelength in a range of 400 nm or more and 500 nm or less, and a wavelength conversion member that is arranged on a light emitting side of the light emitting element and includes a rare earth aluminate fluorescent material having a composition represented by the following formula (I), wherein the light emitting device emits light having a dominant wavelength in a range of 475 nm or more and 500 nm or less, and wherein the light emitting device emits light having an S/P ratio of 6.5 or less derived from the formula (1), which is the ratio of a luminous flux in scotopic vision relative to a luminous flux in photopic vision:

(Lu1-p-nLnpCen)3(Al1-mGam)5kO12  (I)



wherein in the formula (I), Ln represents at least one rare earth element selected from the group consisting of Y, La, Gd, and Tb, and the parameters k, m, n, and p satisfy 0.95≤k≤1.05, 0.05≤m≤0.70, 0.002≤n≤0.050, and 0≤p≤0.30, respectively.

公开(公告)号：US10829689B2

公开(公告)日：2020-11-10

申请号：US16733633

申请日：2020-01-03

Applicant: NICHIA CORPORATION

Inventor： Sadakazu Wakui ,  Kazuya Nishimata ,  Shoji Hosokawa

IPC: C09K11/77 ,  H01L33/50

Abstract: Disclosed are a production method for a nitride fluorescent material, a nitride fluorescent material and a light emitting device. The production method is for producing a nitride fluorescent material that has, as a fluorescent material core, a calcined body having a composition containing at least one element Ma selected from the group consisting of Sr, Ca, Ba and Mg, at least one element Mb selected from the group consisting of Li, Na and K, at least one element Mc selected from the group consisting of Eu, Ce, Tb and Mn, and Al, and optionally Si, and N, and the method includes preparing a calcined body having the above-mentioned composition, bringing the calcined body into contact with a fluorine-containing substance, and subjecting it to a first heat treatment at a temperature of 100° C. or higher and 500° C. or lower to form a fluoride-containing first film on the calcined body, and forming on the calcined body, a second film that contains a metal oxide containing at least one metal element M2 selected from the group consisting of Si, Al, Ti, Zr, Sn and Zn and subjecting it to a second heat treatment at a temperature in a range of higher than 250° C. and 500° C. or lower.

公开(公告)号：US11028320B2

公开(公告)日：2021-06-08

申请号：US16233545

申请日：2018-12-27

Applicant: NICHIA CORPORATION

Inventor： Tomokazu Yoshida ,  Kazuya Nishimata ,  Shoji Hosokawa

IPC: C09K11/08 ,  C09K11/57 ,  H01L33/50

Abstract: Provided is an aluminate fluorescent material having a high emission intensity and having a composition containing a first element that contains one or more of Ba and Sr, and a second element that contains Mg and Mn. In the composition, when a molar ratio of Al is 10, a total molar ratio of the first element is a parameter a, a total molar ratio of the second element is a parameter b, a molar ratio of Sr is a product of a parameter m and the parameter a, a molar ratio of Mn is a product of a parameter n and the parameter b. The parameters a and b satisfy 0.5

公开(公告)号：US20210095204A1

公开(公告)日：2021-04-01

申请号：US17033881

申请日：2020-09-27

Applicant: NICHIA CORPORATION

Inventor： Hiroshi Ogasa ,  Masato Okawa ,  Atsushi Yoshinari ,  Kazuya Nishimata

IPC: C09K11/77 ,  H01L33/50

Abstract: A method for producing a rare earth aluminate fluorescent material includes: subjecting a compound containing Ln that is at least one rare earth element to a first heat treatment at a temperature in a range of 1,000° C. or more and 1,600° C. or less; preparing a raw material containing an oxide containing Ln having a crystallite diameter of 1,500 Å or more obtained through the first heat treatment, a compound containing Ce, a compound containing Al, and optionally a compound containing Ga, having a chemical composition having a total molar ratio of Ln and Ce of 3, a total molar ratio of Al and Ga of a product of 5 and a parameter k of 0.95 or more and 1.05 or less, a molar ratio of Ce of a product of 3 and a parameter n of 0.005 or more and 0.050 or less, and a molar ratio of Ga of a product of a parameter m of 0 or more and 0.6 or less, the parameter k, and 5, and providing a mixture containing the raw material and a compound containing an alkaline earth metal element as a flux in an amount of 2.5% by mass or more and 7.5% by mass or less based on a total amount of the raw material; and subjecting the mixture to a second heat treatment at a temperature in a range of 1,400° C. or more and 1,800° C. or less to provide a calcined product.

公开(公告)号：US10927298B2

公开(公告)日：2021-02-23

申请号：US16854507

申请日：2020-04-21

Applicant: NICHIA CORPORATION

Inventor： Kazuya Nishimata ,  Hiroyuki Watanabe ,  Shoji Hosokawa

IPC: C09K11/77 ,  C09K11/08 ,  H01L33/50 ,  H01L33/32 ,  H01L33/48 ,  H01L33/56 ,  H01L33/62

Abstract: A method for producing a nitride fluorescent material having high emission luminance can be provided. The method includes heat-treating a raw material mixture containing silicon nitride, silicon, an aluminium compound, a calcium compound, and a europium compound.

公开(公告)号：US10414976B2

公开(公告)日：2019-09-17

申请号：US15459572

申请日：2017-03-15

Applicant: NICHIA CORPORATION

Inventor： Tadayoshi Yanagihara ,  Kazuya Nishimata ,  Shoji Hosokawa

IPC: C09K11/77 ,  H01L33/50 ,  H01L33/48

Abstract: A method of producing a fluorescent material that is capable of providing a light emitting device having excellent durability, a fluorescent material, and a light emitting device are provided. The method of producing the fluorescent material includes: preparing a calcined product having a chlorosilicate composition containing at least one element selected from the group consisting of Ca, Sr, and Ba, at least one element selected from the group consisting of Mg and Zn, at least one element selected from the group consisting of Eu, Ce, Tb, and Mn, Si, O, and Cl; and bringing the calcined product in contact with a fluorine-containing substance and heat-treating the calcined product in an inert gas atmosphere at a temperature in a range of 200° C. or more and 450° C. or less.

公开(公告)号：US11512249B2

公开(公告)日：2022-11-29

申请号：US17063696

申请日：2020-10-05

Applicant: NICHIA CORPORATION

Inventor： Sadakazu Wakui ,  Kazuya Nishimata ,  Shoji Hosokawa

IPC: C09K11/77 ,  H01L33/50

Abstract: Disclosed are a production method for a nitride fluorescent material, a nitride fluorescent material and a light emitting device. The production method is for producing a nitride fluorescent material that has, as a fluorescent material core, a calcined body having a composition containing at least one element Ma selected from the group consisting of Sr, Ca, Ba and Mg, at least one element Mb selected from the group consisting of Li, Na and K, at least one element Mc selected from the group consisting of Eu, Ce, Tb and Mn, and Al, and optionally Si, and N, and the method includes preparing a calcined body having the above-mentioned composition, bringing the calcined body into contact with a fluorine-containing substance, and subjecting it to a first heat treatment at a temperature of 100° C. or higher and 500° C. or lower to form a fluoride-containing first film on the calcined body, and forming on the calcined body, a second film that contains a metal oxide containing at least one metal element M2 selected from the group consisting of Si, Al, Ti, Zr, Sn and Zn and subjecting it to a second heat treatment at a temperature in a range of higher than 250° C. and 500° C. or lower.

公开(公告)号：US11142686B2

公开(公告)日：2021-10-12

申请号：US16508974

申请日：2019-07-11

Applicant: NICHIA CORPORATION

Inventor： Shozo Taketomi ,  Shoji Hosokawa ,  Tomokazu Yoshida ,  Kazuya Nishimata

IPC: C09K11/64 ,  H01L33/50

Abstract: Provided are a method of producing an aluminate fluorescent material, an aluminate fluorescent material and a light emitting device. The production method includes heat-treating a mixture prepared by mixing a compound containing at least one alkaline earth metal element selected from the group consisting of Ba, Sr and Ca, a Mg-containing compound not acting as a flux, a Mn-containing compound, an Al-containing compound, a first flux containing at least one alkali metal element selected from the group consisting of Na, K, Rb and Cs, and a Mg-containing second flux to give an aluminate fluorescent material.

公开(公告)号：US10392558B2

公开(公告)日：2019-08-27

申请号：US15704689

申请日：2017-09-14

Applicant: NICHIA CORPORATION

Inventor： Shozo Taketomi ,  Shoji Hosokawa ,  Tomokazu Yoshida ,  Kazuya Nishimata

IPC: C09K11/64 ,  H01L33/50

Abstract: Provided are a method of producing an aluminate fluorescent material, an aluminate fluorescent material and a light emitting device. The production method includes heat-treating a mixture prepared by mixing a compound containing at least one alkaline earth metal element selected from the group consisting of Ba, Sr and Ca, a Mg-containing compound not acting as a flux, a Mn-containing compound, an Al-containing compound, a first flux containing at least one alkali metal element selected from the group consisting of Na, K, Rb and Cs, and a Mg-containing second flux to give an aluminate fluorescent material.

公开(公告)号：US10256375B2

公开(公告)日：2019-04-09

申请号：US15715841

申请日：2017-09-26

Applicant: NICHIA CORPORATION

Inventor： Shoji Hosokawa ,  Kazuya Nishimata ,  Tomokazu Yoshida

IPC: H01L33/50 ,  G02F1/1335

Abstract: Provided is a light emitting device capable of realizing color reproducibility in a broad range. The light emitting device contains a light emitting element having an emission peak wavelength in a range of 430 nm or more and 470 nm or less, a first fluorescent material having a composition represented by formula (I), which has an emission peak wavelength in a range of 510 nm or more and 525 nm or less and has an average particle diameter that is 10.0 μm or more and 30.0 μm or less, and a second fluorescent material having an emission peak wavelength in a range of 620 nm or more and 670 nm or less: X1aMgbMncAldOa+b+c+1.5d  (I) wherein X1 represents at least one element selected from the group consisting of Ba, Sr and Ca, and a, b, c and d satisfy 0.5≤a≤1.0, 0.0≤b≤0.7, 0.3≤c≤0.7, and 8.5≤d≤13.0.