Mechanism and control of visible emission of Cu in glasses

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K14132
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Inorganic materials/Physical properties
• Research Institution: Anan National College of Technology
• Principal Investigator: Konishi Tomoya 阿南工業高等専門学校, その他部局等, 特別研究准教授 (90455163)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: リン酸塩ガラス / 蛍光 / 構造 / 銅イオン

Outline of Final Research Achievements

Copper-doped tin zinc phosphate glass emits visible light when it is excited by near-ultra violet (UV) light. This glass is potentially applied to new white colour LED with improved colour rendering property, because it shows yellowish white emission with wide spectral range. Photoluminescence by common metals like copper is not so common. In this study, we pay attention on the effects of tin oxide content (II) on the emission centre formation in terms of chemical states and glass structure. The amount of emission centre increased by increasing tin oxide content. The doped copper oxide (II) was reduced to copper(I) whereas the ratio of tin(II) ion decreased with the increasing tin oxide (II) content. Infrared spectroscopic analysis showed that the phosphate chain is dissociated by tin oxide (II) and affects the formation of emission centres. This suggested the possibility of controlling the emission properties by using network modifying oxides.

Free Research Field

無機材料工学