The Composite Structure and Two-Peak Emission Behavior of a Ca1.5Ba0.5Si5O3N6:Eu2+ Phosphor

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• 作者：Woon Bae Park ; Hyunmin Kim ; Hwangseo Park ; Chulsoo Yoon ; Kee-Sun Sohn
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：March 7, 2016
• 年：2016
• 卷：55
• 期：5
• 页码：2534-2543
• 全文大小：614K
• ISSN：1520-510X

文摘

A Ca_1.5Ba_0.5Si₅O₃N₆:Eu²⁺ phosphor with a monoclinic lattice in the Cm space group exhibiting a composite structure consisting of CaSi₂O₂N₂-like and BaSi₆N₈O-like structures was examined in terms of structure and luminescence. The luminescent properties of the Ca_1.5Ba_0.5Si₅O₃N₆:Eu²⁺ phosphor could be suitable for light-emitting diode applications since it exhibited a promising yellow (or amber) emission peaking at ∼570–590 nm at excitations of 450–460 nm. The present investigation was focused on verifying the composite structure by employing quantum mechanical calculations such as the Hartree–Fock ab initio calculation and a density functional theory calculation along with precise structural and compositional analyses. The two-peak emission behavior ascribed to the composite structure was also examined in terms of continuous wave and time-resolved photoluminescence. In addition, the energy transfer between two activator sites ascribed to the composite structure was examined in detail.