Near UV emission and p-type conductivity in Zn1−xLixO and Zn1−xNaxO nanomaterial system

The nanomaterial system Zn_1−xLi_xO and Zn_1−xNa_x  O (0?x?0.15$0?x?0.15$) were synthesized by controlled solid state reaction. XRD analysis showed well formed wurtzite structure of average particle size about 50 nm and change in lattice parameters due to incorporation of group I element in ZnO lattice. SEM exhibited formation of nanorods. Hall effect measurement of Zn_1−xLi_xO and Zn_1−xNa_xO system showed p-type conductivity which varied with concentration of Li and Na. Photoluminescence showed strong emission peak in near UV at 3.11 eV (398 nm) and negligible visible emission. The PL peak positions in Zn_1−xLi_xO and Zn_1−xNa_xO nearly coincide which suggest very similar recombination mechanism in Li and Na doped ZnO nanocrystals. The results hold potential for fabrication of ZnO based near UV LEDs.