Methanol-water system for solvothermal synthesis of YVO<inf>4</inf>:Eu with high photoluminescent intensity

• Main Authors: Sulawan Kaowphong, Kouichi Nakashima, Valery Petrykin, Somchai Thongtem, Masato Kakihana
• Format: Journal
• Published: 2018
• Subjects: Materials Science
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=58149345987&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/49219
• Institution: Chiang Mai University

A methanol-water mixed solvent was used as a reaction medium for the preparation of Eu3+-doped YVO4 phosphor materials. These were synthesized by a solvothermal method at 150°-300°C using a 10 vol% solution of water in methanol as the reaction medium followed by calcination at 1000°-1200°C. The phase composition and optical properties of the products were characterized by X-ray diffraction, scanning electron microscope, and photoluminescence spectroscopy. The powders obtained were composed of spherical particles ∼0.5 μm in size, with an internal structure that was different for samples prepared under subcritical and supercritical conditions of methanol. After the calcination, the powders obtained at 240°-300°C retained the initial raspberry-like morphology, whereas the morphology of samples prepared at 150°-210°C changed significantly due to noticeable sintering. The fluorescence intensity exhibited by the prepared samples was higher than the fluorescence intensity shown by one of the best commercial YVO4:Eu phosphors having a large particle size. © 2008 The American Ceramic Society.