Strong negative luminescence is displayed by type-II InAs/GaSb superlattice
diodes under reverse bias. The negative emittance at room temperature is a
s high as 1.5 mu W/cm(2) meV at 4.9 mu m, and the negative efficiency at 3.
5 mu m is 41% of the emission from a perfect blackbody at that temperature.
The main features of the data are reproduced by a detailed photodiode simu
lation. (C) 1999 American Institute of Physics. [S0003-6951(99)05218-3].