InAs/GaSb superlattice interband cascade light emitting diodes with high output power and high wall-plug efficiency

Lu, Qi and Krier, Anthony and Zhou, Yi and Cai, Xuliang and Xu, Zhicheng and Chen, Jianxin and He, Li (2019) InAs/GaSb superlattice interband cascade light emitting diodes with high output power and high wall-plug efficiency. Applied Physics Letters, 114 (25): 253507. ISSN 0003-6951

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Abstract

In this work, 2-stage and 5-stage mid-infrared superlattice interband cascade light emitting diodes (ICLEDs) were fabricated and studied at different temperatures. The ICLEDs were composed of InAs/GaAsSb active regions, InAs/AlAsSb injection regions, and GaAsSb/AlAsSb tunneling regions. The devices exhibited high output power and very low series resistance, indicating efficient carrier blocking and tunneling in the designed structure. Radiances of 0.73 W/cm2 sr and 0.38 W/cm2 sr were achieved at 300 K for the 5-stage and 2-stage ICLEDs, respectively. With an output power of 3.56 mW, the wall-plug efficiency of the 5-stage ICLED reached 0.5% at 80 K, under an injection current of 350 mA. The efficiency was largely maintained in the same range with increasing current injection. The results showed that ICLEDs have great potential for mid-infrared light emitting diode applications requiring large output power and high wall-plug efficiency.