Comparative analysis of emission and absorption spectra of zinc oxide powders

Photoluminescence and optical absorption spectra induced by proton and electron irradiation in zinc oxide powders have been investigated. It has been found that the emission band in a visible region with a maximum of about 2.3 eV is a superposition of three bands with 2.55, 2.34, 2.12 eV, respectively, caused by oxygen vacancies V _O⁺, interstitial oxygen O _i ⁻, and zinc vacancies V _Zn⁻ absorbing in the 3.03-, 2.83-, and 2.64-eV bands.