US 11,862,759 B2
Wavelength converting material for a light emitting device
Peter Josef Schmidt, Aachen (DE); Rob Engelen, Eindhoven (NL); and Thomas Diederich, Aachen (DE)
Assigned to Lumileds LLC, San Jose, CA (US)
Filed by Lumileds LLC, San Jose, CA (US)
Filed on Sep. 2, 2020, as Appl. No. 17/010,257.
Application 17/010,257 is a continuation of application No. 16/342,491, granted, now 10,770,627, previously published as PCT/EP2018/047647, filed on Sep. 12, 2018.
Claims priority of application No. 17193745 (EP), filed on Sep. 28, 2017.
Prior Publication US 2021/0126168 A1, Apr. 29, 2021
Int. Cl. H01L 33/50 (2010.01); C09K 11/77 (2006.01)
CPC H01L 33/504 (2013.01) [C09K 11/7708 (2013.01); C09K 11/77744 (2021.01)] 17 Claims
OG exemplary drawing
 
1. A light emitting device comprising:
a light source; and
a luminescent material, the luminescent material, comprising:
RE3Ga5−x−yAxSiO14:Cry (RE=La, Nd, Gd, Yb, Tm; A=Al, Sc), where 0≤x≤1 and 0.005≤y≤0.1;
a host lattice crystallizing in a trigonal calcium gallogermanate structure type; and
dopants disposed in the host lattice, the dopants comprising:
trivalent chromium; and
tetravalent chromium in a concentration that is less than 1% of a total concentration of all chromium in the luminescent material.