US 11,840,773 B1
Aluminum nitride single crystals having controllable color and methods of forming them
Robert T. Bondokov, Watervliet, NY (US); James R. Grandusky, Waterford, NY (US); Jianfeng Chen, Ballston Lake, NY (US); Sean P. Branagan, Green Island, NY (US); Shichao Wang, Troy, NY (US); Toru Kimura, Tokyo (JP); Thomas Miebach, Malta, NY (US); Keisuke Yamaoka, Fuji (JP); and Leo J. Schowalter, Latham, NY (US)
Assigned to Crystal IS, Inc., Green Island, NY (US)
Filed by CRYSTAL IS, INC., Green Island, NY (US)
Filed on Dec. 8, 2021, as Appl. No. 17/545,179.
Application 17/545,179 is a continuation in part of application No. 16/444,147, filed on Jun. 18, 2019, granted, now 11,555,256.
Claims priority of provisional application 63/126,656, filed on Dec. 17, 2020.
Claims priority of provisional application 62/686,883, filed on Jun. 19, 2018.
Int. Cl. C30B 29/40 (2006.01); C30B 23/02 (2006.01)
CPC C30B 29/403 (2013.01) [C30B 23/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An AlN single crystal having (i) a diameter of at least approximately 25 mm, (ii) an ultraviolet (UV) absorption coefficient of less than 30 cm−1 for a wavelength of 265 nm, and (iii) CIELAB color space parameters of 35<L*<91, −1<a*<20, and 2<b*<43.