Abstract
Herein we describe a large scale synthesis of nanosized, monoclinic Y2O3 and Y2O3:Eu3+ with 2 mol% Eu3+ in a plasma-discharge chamber.
Highlights
Yttrium oxide (Y2O3) doped with trivalent Eu3+ is a well-known red emitting phosphor, which has found applications in fluorescent lamps and plasma display panels.[1,2] For application in high resolution displays it was thought that small phosphors particles would be necessary and this assumption increased interest to produce nanometre sized Y2O3:Eu3+.3 In the industrial applications of Y2O3:Eu3+ the Y2O3 host has the cubic (C type) phase, which is stable at ambient conditions and, most important, it has a rather high luminous efficiency when doped with Eu3+
The nanometre-sized particles of Y2O3 and Y2O3:Eu3+ obtained by high-temperature plasma synthesis were white under the D50 lamp, similar to that of the bulk material; using 254 nm light excitation only the europium-doped material displayed red luminescence
Energy dispersive X-ray analysis (EDX) of the undoped and doped samples showed some contamination (o0.5%) of Fe and Cu, the Fe was probably from the stainless steel rings in the reaction chamber and the origin of the Cu was from the nozzles of the plasma discharge flame
Summary
Yttrium oxide (Y2O3) doped with trivalent Eu3+ is a well-known red emitting phosphor, which has found applications in fluorescent lamps and plasma display panels.[1,2] For application in high resolution displays it was thought that small phosphors particles would be necessary and this assumption increased interest to produce nanometre sized Y2O3:Eu3+.3 In the industrial applications of Y2O3:Eu3+ the Y2O3 host has the cubic (C type) phase, which is stable at ambient conditions and, most important, it has a rather high luminous efficiency when doped with Eu3+. In the industrial applications of Y2O3:Eu3+ the Y2O3 host has the cubic (C type) phase, which is stable at ambient conditions and, most important, it has a rather high luminous efficiency when doped with Eu3+. There are three other Y2O3 polymorphs, two of these have the A- and B-type rare earth sesquioxide structures that correspond to hexagonal and monoclinic phases respectively. The latter monoclinic B-type phase is formed at high pressure, whilst the hexagonal A-type structure has been reported to be formed at 2325 1C,4 which is close to the melting temperature of Y2O3 at 2410 1C. In this study we focus on the monoclinic and cubic phases of Y2O3:Eu3+, the high temperature phases will not be considered The cubic Y2O3 polymorph transforms to a fluorite phase with disordered oxygen vacancies at 2308 1C.5 In this study we focus on the monoclinic and cubic phases of Y2O3:Eu3+, the high temperature phases will not be considered
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
