| AVS 54th International Symposium | |
| Nanometer-scale Science and Technology | Thursday Sessions |
| Session NS-ThP |
| Session: | Nanometer-Scale Science & Techology Poster Session II |
| Presenter: | M.J. Fisher, Colorado State University |
| Authors: | M.J. Fisher, Colorado State University W. Wang, Colorado State University P.K. Dorhout, Colorado State University E.R. Fisher, Colorado State University |
| Correspondent: | Click to Email |
Flat electroluminescent, plasma, and field emission devices demand materials with better stability, brightness, and industrial processing ability. Lanthanide ions (e.g. Eu+3) have sharp and intense emission lines, and exhibit high luminescence yields. Synthesis technique, particle size and heating process strongly affect the physico-chemical properties of lanthanide ion containing oxide materials. We have synthesized pure phase LaPO4:Eu bulk-powders and nanoparticles via the sol-gel template method, which has a high industrial processing ability for pure-phase submicron scale materials. Materials were dried at 70 °C, and sintered at 650 °C. Powder X-ray diffraction indicates that at 70 °C the bulk powder is a mix of hexagonal and monazite phases, whereas at 650 °C the bulk-powder is a pure monazite phase. SEM showed the morphology of the nanoparticles is tubular. Luminescence spectra of both the bulk-powder and the nanotubes contain the typical Eu+3 peaks.1 As the nanotubes diameter decreases from 200 nm to 20 nm, the luminescence spectrum developed a broad background. The temperature and particle size are major factors in the observed phase and luminescence properties of the materials synthesized. Site-selected excitation, energy dispersive spectroscopy, and x-ray photoelectron spectroscopy results will also be discussed.
1 J. Dexpert-Ghys, R. Maurioct, and M. D. Fauxher, Journal of Luminescence 69, 203 (1996).