Photoluminescence of High-Aspect-Ratio PbTiO3 Nanotube Arrays

High-aspect-ratio PbTiO3 nanotube arrays have been synthesized by the hydrothermal method. X-ray diffraction result shows that PbTiO3 nanotube arrays have a tetragonal perovskite structure without any other impurity. The photoluminescence property of PbTiO3 nanotube arrays studied at room temperature reveals a strong green emission band peaking at 550 nm (2.25 eV). Both Raman spectroscopy and X-ray photoelectron spectroscopy demonstrate the existence of local defects in PbTiO3 nanotube arrays, which act as emission source and result in the photoluminescence behavior of PbTiO3 nanotube arrays.