Fig. 1. （a） the schematic diagram of resonant cavity interband cascade LED structure，（b） the schematic diagram of resonant cavity LED simulation structure

Fig. 2. （a） The dependence of the reflectivity and the radiation enhancement factor G on the different periods of DBR when the cavity length is λ/2，（b） the relationship between R₁，R₂ and t

Fig. 3. The distribution of the electric field intensity in the cavity at different cavity lengths： （a） λ/2，（b） λ

Fig. 4. （a） The dependence of the output power of resonant cavity LED on the position of dipolar in the cavity for the case when the cavity length is λ，（b） the dependence of the radiation enhancement factor G on the cavity order m

Fig. 5. The dependence of the total radiation enhancement factor G on the cavity order m at different periods of DBR

Fig. 6. The far field angular profile of the emission： （a） without the resonant cavity，（b） with the resonant cavity

Fig. 7. （a） The dependence of G on the wavelength，（b） the electroluminescence spectra of RCLED at 300 K