Continuous production of phosphor YAG:Tb nanoparticles by hydrothermal synthesis in supercritical water

• Published in: Materials research bulletin Vol. 38; no. 7; pp. 1257 - 1265
• Main Authors: Hakuta, Yukiya, Haganuma, Tsukasa, Sue, Kiwamu, Adschiri, Tadafumi, Arai, Kunio
• Format: Journal Article
• Language: English
• Published: London Elsevier Ltd 19.06.2003; Amsterdam Elsevier Science
• Subjects: A. Nanostructure; A. Oxides; ALUMINIUM NITRATES; ALUMINIUM OXIDES; B. Chemical synthesis; C. X-ray diffraction; Chemistry; Colloidal state and disperse state; D. Luminescence; EMISSION SPECTRA; Exact sciences and technology; FERRITE GARNETS; General and physical chemistry; General, apparatus, technics of preparation; HYDROTHERMAL SYNTHESIS; LUMINESCENCE; MATERIALS SCIENCE; NANOSTRUCTURES; PARTICLE SIZE; PH VALUE; POTASSIUM HYDROXIDES; POTASSIUM IONS; POTASSIUM NITRATES; SALTS; SOLS; STOICHIOMETRY; TERBIUM NITRATES; X-RAY DIFFRACTION; YTTRIUM NITRATES; B. Chemical synthesis; A. Nanostructure; A. Oxides; C. X-ray diffraction; D. Luminescence; Ternary compound; Water; Particle size; Hydroxides; Nanoparticle; Transition metal Compounds; Doping; Luminescence; Photoluminescence; Terbium addition; Aluminium Oxides; Garnet type compound; Chemical synthesis; Colloidal sol; X ray diffraction; Transmission electron microscopy; Yttrium Oxides; Preparation; Supercritical solvent; Hydrothermal condition
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/S0025-5408(03)00088-6

Phosphor YAG:Tb ((Y 2.7Tb 0.3)Al 5O 12) nano particles were synthesized by a hydrothermal method at supercritical conditions (400 °C and 30 MPa) using a flow reactor. Hydroxide sol solutions formed by stoichiometric aluminum nitrate, yttrium nitrate, terbium nitrate and potassium hydroxide solutions. The relationship between particle size and experimental variables including pH, concentration of coexistent ions and hydroxide sol were investigated. Particles were characterized by XRD, TEM and photo-luminescence measurements. Particle size of YAG:Tb became finer as pH was increased or potassium nitrate concentration of the starting metal salt solution was increased. By removing the coexisting ions (NO 3 −, K +) from the metal salt solution, single phase YAG:Tb particles with 20 nm particle size were obtained. The emission spectra of YAG:Tb particles of 14 nm shows a blue shift.