|Budget Amount *help
¥3,200,000 (Direct Cost : ¥3,200,000)
Fiscal Year 1999 : ¥1,300,000 (Direct Cost : ¥1,300,000)
Fiscal Year 1998 : ¥1,900,000 (Direct Cost : ¥1,900,000)
In recent years, the development of the production process of submicron luminescent/phosphors fine particles (multicomponent oxide) with controlled in size and chemistry is become important. The particles is used in a various applications, for instance, at the plasma display panel (PDP). In general, luminescent particles are prepared using a solid-state method which necessary long-time synthesis process, a quite high temperature, milling, etc. These post-processing allow mixture of impurities, and this will lose the luminescent function of the particles prepared. The objective of our research is to investigate and apply a spray pyrolysis process with low-pressure system for preparation of particles. The atomizer used has a potential to generate droplet having size below I micrometer at a relatively high production rate. This research have been prepared the luminescent materials as multicomponent oxides particles using spray pyrolysis method. We have been investigated experimentally the
influence of process parameters such as the droplet generation condition, size of the droplets, initial concentration and the other properties of the spraying solution, and heating rate, on morphology, chemistry and production yield of the final particles.
The precursor of the multicomponent of the oxides included the dopants are prepared as spraying solutions. The solutions were converted into discrete droplets and introduced into a tubular electrical furnace with temperature gradient-controlled, then the final particles were collected at the outlet of the furnace. The application of spray pyrolysis process has been investigated on the preparation of a various luminescent particles such as YィイD22ィエD2SiOィイD25ィエD2 : Ce、YィイD23ィエD2AlィイD25ィエD2OィイD212ィエD2 : Tb、BaOィイD26ィエD2AlィイD22ィエD2OィイD23ィエD2 : Mn、YィイD22ィエD2OィイD23ィエD2 : Eu、CeィイD21-xィエD2TbィイD2xィエD2MgAlィイD211ィエD2OィイD219ィエD2. YィイD22ィエD2SiOィイD25ィエD2 : Tb、GdィイD22ィエD2OィイD23ィエD2 : Eu. As mentioned above, by using the traditional method, i e., solid-state synthesis, it is necessary, to operate long-time and a very high-temperature process to prepare materials having high luminescent intensity and crystallinity However a one-step process, i.e., spray pyrolysis could prepare non-agglomerate and high purity luminescent particles at a few seconds and at a relatively low temperature condition. By scaling-up, it is expectable in the near future to apply the proposed process in the industries. Less