title: [Study on spectral properties of Ca2B5O9Cl : Eu prepared with hydrothermal method and solid method].
abstract: Effects of preparation methods (hydrothermal method and high temperature solid method), excitation condition, and Eu ions concentration on spectral properties of Ca2B5O9Cl : Eu phosphor were studied. The effects of preparation condition on crystal photographs were also discussed. The result showed that the Ca2B5O9Cl : Eu phosphors prepared with hydrothermal method had mainly 5 D0 --> 7F(J) (J = 1, 2, 3, 4) emission of Eu3+ with 254 nm excitation and 4 f6 5d1 --> 8S(7/2) emission of Eu2+ with 365 nm excitation, the one prepared with high temperature solid method had mainly 4 f6 5d1 --> 8S(7/2) emission of Eu2+ with 365 nm excitation and very weak emissions of Eu2+ and Eu3+ with 254 nm excitation. Eu ions concentration hardly affected spectral properties, but the preparation method and excitation conditions had remarkable influence on the properties. SEM revealed that the products prepared both in the air and reductive atmosphere had consummate crystal, slippery surface and appropriate size (0.82-1.06 microm).
authors.affiliation: College of Science, Yanbian University, Yanji 133002, China.
authors.forename: Hong-Jun
authors.initials: HJ
authors.lastname: Dong
authors.forename: Shu-Lan
authors.initials: SL
authors.lastname: Chang