Synthesis and luminescence in sol-gel auto-combustion-synthesized CaSnO3:Eu3+ phosphor

摘要

Undoped and Eu-doped CaSnO3 nanopowders were prepared by a facile sol-gel auto-combustion method calcined at 800 degrees C for 1 h. The samples are found to be well-crystallized pure orthorhombic CaSnO3 structure. Photoluminescence (PL) measurements indicated that the undoped sample exhibits a broad blue emission at about 420-440 nm, which can be recognized from an intrinsic centre or centres in CaSnO3. Eu-doped CaSnO3 showed broad blue emission centred about 434 nm, a weak peak at 465nm and a sharp intense yellow emission line at 592 nm. The emission situated at 592nm was assigned to the f-f transition of D-5(0) - F-7(1) in Eu3+ ions. The afterglow emission and PL decay results in Eu-doped CaSnO3 phosphor, which revealed that there are at least two different traps in this phosphor. From the obtained results, Eu3+-doped CaSnO3 phosphor could be proposed as a potential white luminescent optical material.