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Low‐temperature synthesis and particle‐size control in yttrium‐based phosphors
Author(s) -
Ravichandran D.,
Roy Rustum,
White William B.
Publication year - 1997
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.1985138
Subject(s) - yttrium , phosphor , scanning electron microscope , anhydrous , materials science , particle size , hydrothermal circulation , luminescence , powder diffraction , phase (matter) , hydrothermal synthesis , particle (ecology) , doping , diffraction , tetragonal crystal system , chemical engineering , analytical chemistry (journal) , mineralogy , crystallography , chemistry , optics , composite material , metallurgy , optoelectronics , chromatography , organic chemistry , oxide , oceanography , engineering , geology , physics
Abstract— Yttrium‐based phosphors: Y 2 O 3 :Eu +3 , Y 2 O 3 :Tb +3 , Y 2 SiO 5 :Eu +3 , Y 2 SiO 5 :Tb +3 , and Y 3 Al 5 O 12 :Eu +3 , Y 3 Al 5 O 12 :Tb +3 have been made by sol‐gel processes via organic precursors. In all the compositions, transparent non‐crystalline xerogels were reacted either by dry firing or by hydrothermal reaction. At temperatures of 600–650°C, the gels reacted to single‐phase well‐crystallized anhydrous compounds as shown by powder x‐ray diffraction. Luminescent emission measurements are presented for all the rare‐earth‐activated yttrium‐based compounds. Scanning electron microscopy reveals a particle size of <0.2 μm with a morphology of loose aggregates in the case of Eu‐doped samples.