Infrared light emitting device with two color emission

摘要

We have designed and fabricated two-color infrared light emitting diode (LED) emitting in the wavelength regions of 3-4 urn and 5-10 μm. The interband cascade (IC) LED device was grown on n-type GaSb substrate and has 30 cascaded stages for the long-wave infrared (LWIR) and 15 cascaded stages for the mid-wave infrared (MWIR) emission bands. The two active regions are separated by a 0.5 μm thick contact layer, which is used for biasing the two LEDs. Both room temperature and cryogenic temperature results show emission in the wavelength regions as designed.