%0 Journal Article %T Methods of testing light-emitting elements and devices for middle- and far-IR spectral regions based on negative luminescence phenomena %A Bolgov, Sergej S. %A Konopaltseva, Lyudmila I. %A Pipa, Victor I. %J Proceedings of SPIE %V 2648 %N 1 %P 392-395 %@ 0277-786X %D 1995-11-03 %I SPIE %~ DeepDyve