Patent ID: 8878230

Claim:
A bulk gallium-containing nitride crystal comprising: a length greater than about 5 millimeters; a wurtzite crystal structure; a concentration of oxygen from about 10 10 atoms per cubic centimeter to about 10 17 atoms per cubic centimeter; an impurity concentration greater than about 10 15 cm −3 of at least one of Li, Na, K, Rb, Cs, Ca, F, and Cl; a compensatory dopant selected from V, Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, and a combination of any of the foregoing, wherein the concentration of the compensatory dopant is between about 10 14 cm −3 and about 10 16 cm −3 ; an optical absorption coefficient less than about 10 cm −1 at wavelengths between about 395 nm and about 460 nm; and an electrical resistivity at room temperature greater than about 10 7 ohm-centimeter.