Energy transfer between Tb3+ and Eu3+ in co-doped Y2O3 nanocrystals prepared by Pechini method

摘要: Tb3+ and Eu3+ co-doped Y2O3 nanoparticles with a volume-weighted average size of about 30 nm were synthesized via simple Pechini-type sol–gel process. The growth monocrystalline is investigated XRD TEM analysis. study energy transfer between ions was carried out by means PL, PLE, photoluminescence decay analyses. from to efficient we show how resonant type dipole–dipole interaction the most probable mechanism. We compared energy-transfer efficiencies calculated intensities lifetimes \({}^5\hbox{D}_4 \longrightarrow ^7\hbox{F}_5\) transition Tb, showing presence two populations different local surroundings, in matrix. Furthermore, critical distance has been theories, new probabilistic approach based on discretization theory Chandrasekhar distribution nearest neighbors random particles, PL data, suggesting value 7 A.