title: Eu3+:Y2O3 microspheres and microcubes: a supercritical synthesis and characterization.
abstract: A new approach that uses mixed supercritical solvents of water/1-propanol and water/methanol (400 °C, 40 MPa) to prepare morphology-controlled precursor materials in a very short reaction time, such as 10 min, followed by calcinations has been developed to form Eu(3+):Y(2)O(3) microspheres of 2-3 μm in diameter or microcubes of 2-3 μm in side length, respectively. Eu(3+):Y(2)O(3) microspheres and microcubes exhibited strong red emission at 610 nm corresponding to (5)D(0) → (7)F(2) transition. The highest photoluminescence emission was obtained for the microspheres after calcination at 1000 °C for 1 h in air.
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Sendai 980-8577, Japan. devaraju@tagen.tohoku.ac.jp
authors.forename: M Kempaiah
authors.initials: MK
authors.lastname: Devaraju
authors.forename: Shu
authors.initials: S
authors.lastname: Yin
authors.forename: Tsugio
authors.initials: T
authors.lastname: Sato