Synthesis and luminescent properties of novel Ba_2−xEu_xZr_2−yHf_ySi₃O₁₂ phosphor

详细信息    查看全文

• 作者：V. Tomkute^a ; A. Katelnikovas^a ; ^b ; H. Bettentrup^b ; A. Kareiva^a ; T. J&#xfc ; stel^b ; ^{tj@fh-muenster.de"" rel=""nofollow}
• 关键词：Divalent europium ; Luminescence ; Orthosilicates ; Phosphor converted LEDs ; VUV spectroscopy
• 刊名：Optical Materials
• 出版年：2011
• 出版时间：June 2011
• 年：2011
• 卷：33
• 期：8
• 页码：1272-1277
• 全文大小：617 K

文摘

A series of Eu²⁺ activated luminescent materials according to the composition of Ba_2−xEu_xZr_2−yHf_ySi₃O₁₂ were synthesized using a high temperature solid-state reaction method starting from metal oxides and carbonates. Single phase powders were obtained using two annealing steps and boric acid as a flux. Firstly, starting materials were sintered at 1450 °C for 5 h under CO atmosphere and subsequently annealed at 1200 °C for 5 h under N₂/H₂ (95 % /5 % ) gas flow. All samples were characterized by powder X-ray diffraction (XRD) analysis, thermal quenching (TQ), fluorescence lifetime measurements and photoluminescence (PL) techniques. Moreover, emission colour points, luminous efficacies and quantum efficiencies (QE) were calculated and discussed as a function of Eu²⁺ concentration and Zr/Hf ratio of the host lattice.