Rearrangement of optical centers and stimulated radiation of Eu3+ in polycrystalline huntite under optical and electron-beam excitation

Polycrystalline europium huntite EuAl 3 (BO 3 ) 4 has been prepared by solid-phase synthesis. The spectral and kinetic characteristics of its luminescence under the excitation by a xenon lamp, single laser pulse, and electron beam have been studied. It has been established that the laser excitation of the polycrystalline samples in the 7 F 0 → 5 L 6 transition of Eu 3+ ions with the power density P ≥ 5 × 10 7 W/cm 2 leads to the structure rearrangement of the optical centers, which is accompanied by an increase in the probability of the radiation transitions of the activator. The stimulated radiation of the main type of Eu 3+ centers in the 5 D 0 → 7 F 1 , 7 F 2 , and 7 F 4 transitions has been obtained under the excitation by the electron beam with an energy of 200 keV and a duration of 2 ns.