Theoretical study of optical properties in deep ultraviolet Al-rich AlGaN/AIN quantum wells

Optical properties of deep ultraviolet Al-rich AlGaN/AlN quantum wells (QWs) were theoretically investigated by using the multiband effective-mass theory. The theoretical PL transition wavelength is found to agree well with the experimental result. The internal field in AlGaN/AlN QW structures with lower Al contents is much larger than that in QW structures with higher Al contents. The intensity of the spontaneous emission spectra is shown to be improved with increasing Al content because the optical matrix elements are largely enhanced due to the reduced internal field.