The Preparation and Low Energy Electron (LEE) Excitation of SnO2 : Eu Powder Phosphor

We carried out an investigation on preparation and low energy electron (LEE) luminescence of powder phosphors. Solid powder mixing, hydroxide coprecipitation, and oxalate coprecipitation methods were examined for preparation. The oxalate method was found to give best results. powder phosphors made with 0.5 atomic percent (a/o) and more Eu contained as separate phase. No change of the lattice parameters could be observed up to 8 a/o of added Eu. The amount of Eu actually dissolved in the lattice is estimated to be between 0.05 and 0.5 a/o of Eu/Sn. Cathodoluminescence of phosphors was examined at high and at low excitation voltage. Measured emission spectra did not show green and blue emission lines due to transitions from and higher states, in contrast to observations on single crystals by Crabtree. phosphors show orange‐red emission without any charge‐up effect when excited by electrons as low as 10V. The luminous efficiency was about 0.2–1 lumens/W for various excitation voltages and pulse duties.