Role of Lithium in the Formation of Exciton Luminescence of Zinc Oxide

Glow of own defects in ZnO polycrystals

“…Zinc oxide (ZnO), a wide-gap semiconductor Eg = 3.37 eV, has attracted the attention of researchers for several decades due to a number of attractive applications, especially in optics and optoelectronics [1][2][3]. Although intriguing perspectives have led to extensive studies of ZnO structures, the nature of luminescence associated with major defects and impurities is still under discussion [1][2][3][4][5]. The study of defects is addressed again and again in the context of new applications, synthesis methods and studies that become available [4].…”

“…Although intriguing perspectives have led to extensive studies of ZnO structures, the nature of luminescence associated with major defects and impurities is still under discussion [1][2][3][4][5]. The study of defects is addressed again and again in the context of new applications, synthesis methods and studies that become available [4]. In various forms of zinc oxide, single crystals, films, powders, nanocrystals, and ceramics, two emission regions are recorded at different temperatures: a short-wavelength band near the fundamental absorption edge and a broad longwavelength band determined by the presence of defects and impurities [1][2][3][4][5][6][7][8][9].…”

“…The study of defects is addressed again and again in the context of new applications, synthesis methods and studies that become available [4]. In various forms of zinc oxide, single crystals, films, powders, nanocrystals, and ceramics, two emission regions are recorded at different temperatures: a short-wavelength band near the fundamental absorption edge and a broad longwavelength band determined by the presence of defects and impurities [1][2][3][4][5][6][7][8][9]. As reliably shown by low-temperature studies, short-wavelength luminescence is of an exciton nature.…”