New fabrication of (Y,Gd)2O3:Tb3+ transparent ceramics using ultrafine monospheres

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420686
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Inorganic materials/Physical properties
• Research Institution: National Institute for Materials Science
• Principal Investigator: LI JIGUANG 国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, 主幹研究員 (90354381)
• Co-Investigator(Renkei-kenkyūsha): SAKKA Yoshio 国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, NIMS招聘研究員 (00354217)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 球形微粒子 / 焼結 / 透明セラミック材料 / 光物性

Outline of Final Research Achievements

Basic carbonate monosheres with the average diameter well controlled in the wide range of 110-590 nm were successfully synthesized via homogeneous precipitation for the Y/Gd/Tb ternary system. (Y0.95-xGdxTb0.05)2O3 ceramics with in-line transmittances reaching 80% were then fabricated via vacuum sintering at 1700 deg C of the well-dispersed oxide particles calcined from such monosheres. Colloidal processing produces denser green bodies of higher microstructure uniformity than CIP. The optimal Gd content was determined to be 2 at% for the 545 nm green-emission of Tb3+. Besides, with layered hydroxide nanosheets as a new type of precursor, single-crystal like transparent ceramics (transmittance: 80-83%) were also fabricated via vacuum sintering at 1700 degC. It was found that a lower heating rate of vacuum sintering produces ceramics of higher transparency. Tb3+ emission improves with increasing crystallite or particle size, and has the fluorescence lifetime of about 1.5-2.8 ms.

Free Research Field

光機能性セラミック材料