Reduction, sulfuration and nitridization of nano-sized phosphor by atmospheric pressure plasma for suppressing agglomeration and improving efficiency

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560008
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Applied materials science/Crystal engineering
• Research Institution: Nagaoka University of Technology
• Principal Investigator: KATO Ariyuki 長岡技術科学大学, 工学(系)研究科(研究院), 准教授 (10303190)
• Co-Investigator(Kenkyū-buntansha): KIKUCHI Takashi 長岡技術科学大学, 大学院工学研究科, 准教授 (30375521)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 誘導結合型プラズマ / 蛍光体 / 還元処理

Outline of Final Research Achievements

Reduction treatment using inductively coupled plasma (ICP) has been demonstrated for KSrPO4:Eu phosphor synthesized by polymerized complex method. The emission of reduced divalent Eu ions was enhanced significantly by irradiating ICP using hydrogen mixed buffer gas. The amount of reduced Eu ions was increased with increasing hydrogen concentration, input power and irradiation time. Under the conditions of hydrogen concentration of 5%, input power of 80 W and irradiation time of 15 minutes, the amount of reduced Eu ions has been attained one third of that by conventional heating treatment (hydrogen concentration of 5%, 1000C, 3 hours). Temperature of the sample immediately after irradiation was less than 300C. From the result above, ICP was found to be a effective way to reduce the Eu ions in phosphor in very short time at low temperature.

Free Research Field

光物性物理学