Enhanced Luminescence of Eu-Doped TiO2Nanodots
Department of Material Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou, 310027, People’s Republic of China
Nanoscale Research Letters 2009, 4:809-813 doi:10.1007/s11671-009-9319-5Published: 25 April 2009
Monodisperse and spherical Eu-doped TiO2nanodots were prepared on substrate by phase-separation-induced self-assembly. The average diameters of the nanodots can be 50 and 70 nm by changing the preparation condition. The calcined nanodots consist of an amorphous TiO2matrix with Eu3+ions highly dispersed in it. The Eu-doped TiO2nanodots exhibit intense luminescence due to effective energy transfer from amorphous TiO2matrix to Eu3+ions. The luminescence intensity is about 12.5 times of that of Eu-doped TiO2film and the luminescence lifetime can be as long as 960 μs.