Structural and optical properties of ZnO microrods as fast and efficient UV scintillator materials


Proceedings of the 33rd Samahang Pisika ng Pilipinas Physics Congress, University of Northern Philippines, Vigan City, 3–6 Jun 2015, SPP-2015-5B-07.


Aqueous chemical grown zinc oxide (ZnO) microrods are found to be crystalline, uniform and well-faceted in terms of structure and morphology. From photoluminescence spectroscopy, these microrods interestingly exhibit ultraviolet (UV) near-band-edge emission at 392 nm (3.16 eV) without any visible or defect-related emission. The UV emission also intensifies with increasing excitation energy. Spectral narrowing is not observed indicating the non-existence of lasing nor stimulated emission from these structures. Having fast luminescence lifetimes less than 100 ps, these ZnO microrods then hold a promise as potential candidates for fast and effcient scintillator materials.