부산대학교 도서관

Undoped and Eu-doped $$\hbox {CaSnO}_{3}$$ nanopowders were prepared by a facile sol-gel auto-combustion method calcined at $$800{^{\circ }}\hbox {C}$$ for 1 h. The samples are found to be well-crystallized pure orthorhombic $$\hbox {CaSnO}_{3}$$ 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 $$\hbox {CaSnO}_{3}$$ . Eu-doped $$\hbox {CaSnO}_{3}$$ showed broad blue emission centred about 434 nm, a weak peak at 465 nm and a sharp intense yellow emission line at 592 nm. The emission situated at 592 nm was assigned to the f-f transition of $$^{5}\hbox {D}_{0}\rightarrow ^{7}\hbox {F}_{1}$$ in $$\hbox {Eu}^{3+}$$ ions. The afterglow emission and PL decay results in Eu-doped $$\hbox {CaSnO}_{3}$$ phosphor, which revealed that there are at least two different traps in this phosphor. From the obtained results, $$\hbox {Eu}^{3+}$$ -doped $$\hbox {CaSnO}_{3}$$ phosphor could be proposed as a potential white luminescent optical material. [ABSTRACT FROM AUTHOR]