Exciton structure in sodium doped zinc oxide quantum dots

摘要

Photoluminescence spectra of electrochemically grown ZnO quantum dots doped with Na were studied at low temperature. Incorporation of Na in ZnO quantum dot is confirmed by the appearance of yellow photoluminescence at about 572 nm instead of commonly observable green luminescence at about 530 nm. Chemical analysis also supported the inclusion of Na in ZnO quantum dots. Rich excitonic structure was observed in photoluminescence spectra of these ZnO quantum dots. The excitonic features are analyzed in view of the published work on bulk ZnO.