After exposure of single-crystal ZnS with microscopic twinning to magnetic
fields of 1-10 T, the integral electroluminescence brightness is found to i
ncrease by several times. It is proposed that the magnetic field facilitate
s relaxation of a metastable state of the structural defects. (C) 1999 Amer
ican Institute of Physics. [S1063-7834(99)00711-X].