Ck. Kuo et Ps. Nicholson, PREPARATION AND LUMINESCENCE OF CU-AL2O3 SINGLE-CRYSTAL FILMS ON SAPPHIRE SUBSTRATES( DOPED BETA''), Canadian ceramics quarterly, 65(2), 1996, pp. 139-142
Na- and K-beta ''-Al2O3 single-crystal films were grown on sapphire su
bstrates by heating under controlled temperature and atmospheric condi
tions. Cu+-doped single-crystal films exhibited cathodo- and photo-lum
inescence.