title: Size dependence of Eu-O charge transfer process on luminescence characteristics of YBO3:Eu3+ nanocrystals.
abstract: Well-crystallized pure hexagonal phase YBO(3):Eu(3+) nanoparticles are prepared by the reverse micelles method. Vacuum ultraviolet photoluminescence (VUVPL) spectroscopy showed size-dependent nonlinear luminescence enhancement with remarkably improved chromaticity (0.62, 0.34), as compared to the commercial bulk YBO(3):Eu(3+) phosphor (0.56, 0.39). The quenching concentration of Eu(3+) doping and the ratio of red ((5)D(0)-->(7)F(2)) to orange ((5)D(0)-->(7)F(1)) emission was found significantly enhanced with the decrease in particle size, making it an ideal VUV phosphor for plasma display panels. The possible explanation for size dependence of the Eu-O charge transfer process via lowering of the structural symmetry is proposed in detail.
authors.affiliation: Nanotechnology Application Centre (Formerly Nanophosphor Application Centre), University of Allahabad, Allahabad 211 002, India. prashantnac@gmail.com
authors.forename: Prashant K
authors.initials: PK
authors.lastname: Sharma
authors.forename: Ranu K
authors.initials: RK
authors.lastname: Dutta
authors.forename: Avinash C
authors.initials: AC
authors.lastname: Pandey