US 12,258,507 B2
Fluorescent diamond and method for producing same
Motoi Nakao, Kitakyushu (JP); Shinji Nagamachi, Amagasaki (JP); Masahiro Nishikawa, Tokyo (JP); and Ming Liu, Tokyo (JP)
Assigned to DAICEL CORPORATION, Osaka (JP); and KYUSHU INSTITUTE OF TECHNOLOGY, Kitakyushu (JP)
Appl. No. 17/290,105
Filed by DAICEL CORPORATION, Osaka (JP); and KYUSHU INSTITUTE OF TECHNOLOGY, Kitakyushu (JP)
PCT Filed Oct. 29, 2019, PCT No. PCT/JP2019/042401
§ 371(c)(1), (2) Date Apr. 29, 2021,
PCT Pub. No. WO2020/090825, PCT Pub. Date May 7, 2020.
Claims priority of application No. 2018-206068 (JP), filed on Oct. 31, 2018.
Prior Publication US 2021/0395607 A1, Dec. 23, 2021
Int. Cl. C09K 11/65 (2006.01); C01B 32/26 (2017.01); C01B 32/28 (2017.01); C23C 16/02 (2006.01); C23C 16/27 (2006.01); C23C 16/56 (2006.01); C30B 25/18 (2006.01); C30B 29/04 (2006.01); C30B 33/04 (2006.01)
CPC C09K 11/65 (2013.01) [C01B 32/26 (2017.08); C01B 32/28 (2017.08); C23C 16/0281 (2013.01); C23C 16/271 (2013.01); C23C 16/278 (2013.01); C23C 16/56 (2013.01); C30B 25/186 (2013.01); C30B 29/04 (2013.01); C30B 33/04 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A fluorescent diamond comprising an MV center at a concentration of 1×1014/cm3 or higher, wherein M represents a metal or metalloid, and V represents a vacancy, wherein the fluorescent diamond satisfies (i), (ii), and (iii)
(i) having a ratio of the number of vacancies to be introduced to the number of atoms of the metal or metalloid of from 0.1 to 10000 (number of V/number of M);
(ii) containing from 0.0001 to 1 atomic % of the metal or metalloid (M); and
(iii) having a concentration of NV (Nitrogen-Vacancy) centers of 1×1017/cm3 or lower,
wherein no characteristic unique to the luminescence of the NV center is observed, and
wherein the density of vacancies of the fluorescent diamond is from 1×1016/cm3 to 3×1021/cm3.