OPTICAL PROPERTIES OF ZINC OXIDE DOPED BY (Al, Cd, Co, Li and Mg)

In this work Zinc Oxide was doped by (Al, Cd, Co, Li and Mg). The samples were prepared using chemical method at 70oC.The optical characteristics of the prepared samples have been investigated by UV/Vis spectrophotometer in the wavelength range (200 – 800) nm .The samples have a direct allow electronic transition with optical energy (Eg) values decreased from (3.966) eV for Zn Al2O3sample to (3.505) eV for the ZnLi2O2sample. The maximum value of the absorption coefficient (α) for all sample are given about (> 1.68 x104 cm-1) for the Zn Al2O3and Zn Cd O4 sample at (320 nm and 310 nm). Also the extinction coefficient (K) was calculated. The results indicate the samples have good characteristics for optoelectronic applications