科研之友
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摘要
A novel Sr3Ti2O7: Eu3+ red phosphor with double-layered perovskite structure was successfully synthesized by solid-state reaction method using Li+ ions as charge compensators. Its crystal structure, morphology and photoluminescence under different calcination temperatures and different compensation styles of Li+ were investigated. The phosphor could obtain pure tetragonal perovskite phase with I4/mmm space group at 1300 degrees C. Non-stoichiometric (NSC) compensation could keep more Sr2+ ions to hold the perovskite structure stable for higher doping concentration of Eu3+. The emission was dominated by the electric-dipole transition with obvious peak splitting due to two different doping sites with lower symmetry of Sr2+. Layered structure provided bigger space to hold more Li+ ions and NSC style had bigger advantage on the luminescence enhancement for higher doping concentration. Better excitation matches, higher quantum yield (25.1%, lambda(ex) = 395 nm) and better color rendering properties provided a potential red material for white LEDs.
