Luminescence properties of Lu3M5O12:Eu3+ (M = Al, Ga) and effects of Bi3+ co-dopant
The Eu3+-doped and Eu3+, Bi3+ co-doped Lu3M5O12 (LuMG where M = Al, Ga) phosphors are synthesized by spray pyrolysis, and the crystal structure, micromorphology, luminescence properties and effects of Bi3+ co-dopant are investigated. X-ray diffraction reveals that the crystal structures of the matrices do not change after partial replacement of Lu3+ by Eu3+ and Bi3+. The phosphors exhibit the same spherical micromorphology without agglomeration and particle size distribution with a typical diameter of about 0.7 μm. The emission and excitation spectra show transitions associated with the Eu3+ 4f configurations. 7F1 energy level splitting of Eu3+ in Lu3Al5O12:Eu and stronger luminescence of Lu3Ga5O12:Eu are observed, and the quenching concentrations of Eu3+ in Lu3Al5O12:Eu and Lu3Ga5O12:Eu are 6 and 10 mol% with respect to Lu3+, respectively. Introduction of Bi3+ enhances the emission of Eu3+ accompanied by the transition emission of Bi3+.
KeywordsLu3Al5O12:Eu Lu3Ga5O12:Eu Spray pyrolysis Luminescence properties Energy transfer
The work was financially supported by the Natural Science Fund Project in Jiangsu Province of China (BK2012869) as well as Guangdong—Hong Kong Technology Cooperation Funding Scheme (TCFS) GHP/015/12SZ.