Control of Luminescence Intensity from Rare Earth Ion (Eu~(3+), Tb~(3+))-Doped Polyimide Nanoparticles by UV-Irradiation and Thermal Treatment

摘要

We prepared size-controlled rare earth ion-doped PI particles by the reprecipitalion method. The particles with various sizes were prepared under various reprecipitation conditions. The interesting luminescence properties were observed: luminescence intensity assigned to rare earth ion increased with increase of UV-irradiation time. The intensity decreased with elevation of treatment temperature, and varnished at 200 deg C. After the erase of luminescence, the intensity increased under the UV-irradiation again. UV-induced luminescence enhancement, thermal luminescence elimination and UV-reinduced enhancement after elimination of rare earth ion have never been reported. Rare earth ion-doped PI particles may be promising material for a rewritable memory and image-recording devices.