Abstract
The photoluminescent (PL) properties of europium (Eu) doped SrF2 and CaF2 nanoparticles have been investigated after annealed in an Ar/H2 atmosphere at different temperatures for possible down-conversion applications in solar cells. PL investigations revealed that the Eu doped samples exhibited emission from both Eu2+ and Eu3+ ions. The emission spectrum’s shape of the Eu2+ doped SrF2 sample stayed unchanged, unlike the Eu2+ doped CaF2 sample. Temperature treatments significantly affected the Eu3+ emission. A complete reduction of Eu3+ to Eu2+ occurred during heating under H2 atmosphere. Degradation of the Eu2+ emission intensity occurred during prolonged laser irradiation of the annealed SrF2 as-prepared samples, but it was stable at 800 °C annealing temperature. These results demonstrated that temperature treatment destroyed the surface trap centers and enhanced the photoemission stability of the Eu2+.
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