公开(公告)号：US20210095202A1

公开(公告)日：2021-04-01

申请号：US17033576

申请日：2020-09-25

Applicant: NICHIA CORPORATION

Inventor： Kenichi AOYAGI ,  Takashi KAIDE ,  Yuya TAKAHASHI ,  Shoji HOSOKAWA

IPC: C09K11/77 ,  C09K11/08 ,  C01F17/30

Abstract: Provided a method of producing a β-sialon fluorescent material having excellent emission intensity. The method includes providing a first composition containing aluminum, an oxygen atom, and a europium-containing silicon nitride, heat treating the first composition, contacting the heat-treated composition and a basic substance to obtain a second composition, and contacting the second composition resulting from contacting the heat-treated composition with the basic substance and an acidic liquid medium containing an acidic substance.

公开(公告)号：US20230045233A1

公开(公告)日：2023-02-09

申请号：US17937766

申请日：2022-10-03

Applicant: NICHIA CORPORATION

Inventor： Kenichi AOYAGI ,  Takashi KAIDE ,  Yuya TAKAHASHI ,  Shoji HOSOKAWA

IPC: C01B21/082 ,  C01F17/30 ,  C09K11/08 ,  C09K11/77

Abstract: Provided a method of producing a β-sialon fluorescent material having excellent emission intensity. The method includes providing a first composition containing aluminum, an oxygen atom, and a europium-containing silicon nitride, heat treating the first composition, contacting the heat-treated composition and a basic substance to obtain a second composition, and contacting the second composition resulting from contacting the heat-treated composition with the basic substance and an acidic liquid medium containing an acidic substance.

公开(公告)号：US20250101302A1

公开(公告)日：2025-03-27

申请号：US18894198

申请日：2024-09-24

Applicant: NICHIA CORPORATION

Inventor： Yuya TAKAHASHI ,  Takashi KAIDE ,  Hiroyuki WATANABE

IPC: C09K11/77 ,  C09K11/02 ,  H01L33/50

Abstract: A β-SiAlON fluorescent material includes fluorescent material particles having a composition represented by the following formula (I), and a coating layer formed on the surface of the fluorescent material particles and having a refractive index smaller than that of the fluorescent material particles, wherein when the β-SiAlON fluorescent material is measured by inductively coupled plasma-atomic emission spectroscopy, an amount of the coating layer is 0.4% by mass or more relative to a total amount of the fluorescent material particles and the coating layer being 100% by mass: Si6-zAlzOzN8-z:Euy  (I), wherein y and z satisfy 0