US 11,868,034 B2
Phosphor particle, wavelength conversion element, light source device, method of manufacturing phosphor particle, method of manufacturing wavelength conversion element, and projector
Toshiaki Hashizume, Okaya (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Aug. 26, 2021, as Appl. No. 17/446,103.
Claims priority of application No. 2020-143932 (JP), filed on Aug. 27, 2020.
Prior Publication US 2022/0066303 A1, Mar. 3, 2022
Int. Cl. G03B 21/20 (2006.01); H01L 33/50 (2010.01); H01L 33/00 (2010.01)
CPC G03B 21/204 (2013.01) [H01L 33/005 (2013.01); H01L 33/502 (2013.01); H01L 2933/0041 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A phosphor particle configured to emit fluorescence longer in wavelength than excitation light entering the phosphor particle, comprising:
a concave portion which is no smaller than 0.1 times as large as the wavelength of the fluorescence and no larger than 10 times as large as the wavelength of the fluorescence, the concave portion being disposed on a surface of the phosphor particle.