UV/blue Light Emitting AlGaN/GaN Heterostrucutures

Blue-LED has been eagerly demanded not only for use as small indicators but also for the realization of a new all solid state full color flat panel display systems. Besides, the practical short wavelength LD enables us to develop compact and high density optical storage systems and small medical equipments. Column-III nitrides, InN, GaN, AlN and their alloys (AlxGa1-x)1-yInyN (x≥O,y≥O), especially AlGaN alloys are promising candidates as the materials for fabrication of such short wavelength light emitters, because AlGaN alloy system has the direct transition type band structure with the band gap energies at room temperature (RT) from 3.39eV to 6.2eV which correspond to the wavelengths from 375nm to 20Onm