The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 24, 2023
Filed:
Jul. 01, 2019
Ngk Spark Plug Co., Ltd., Nagoya, JP;
Shohei Takaku, Nagoya, JP;
Yusuke Katsu, Nagoya, JP;
Tsuneyuki Ito, Nagoya, JP;
Toshiaki Kurahashi, Nagoya, JP;
Hideto Yamada, Nagoya, JP;
NGK SPARK PLUG CO., LTD., Nagoya, JP;
Abstract
One aspect of the disclosure provides an optical wavelength conversion member including a polycrystalline ceramic sintered body containing, as main components, AlOcrystal grains and crystal grains represented by formula (Y,A)BO:Ce. In the optical wavelength conversion member, a (Y,A)BO:Ce crystal grain has a region wherein the A concentration of a peripheral portion of the (Y,A)BO:Ce crystal grain is higher than that of an interior portion of the (Y,A)BO:Ce crystal grain. Thus, the optical wavelength conversion member exhibits high fluorescence intensity (i.e., high emission intensity) and high heat resistance (i.e., low likelihood of temperature quenching). The optical wavelength conversion member has a structure wherein the element A concentration of a peripheral portion of a (Y,A)BO:Ce crystal grain differs from that in an interior portion of the crystal grain. This structure can achieve a ceramic fluorescent body exhibiting superior fluorescent characteristics and superior thermal characteristics with varied colors of emitted light.