Abstract
Amorphous blue nanophosphors have been produced for the first time by pulsed electron beam evaporation of polycrystalline phosphor targets of the composition Ca2M8(SiO4)6O2:Eu (M=Y, Gd) with oxyapatite structure. Radiation reduction of Eu3+→Eu2+ ions in the electron beam has been detected. The crystallization of amorphous nanopowders has been studied by differential scanning calorimetry and thermogravimetry (40–1400°C). A modification of the Raman spectra of the samples has been found when the particle size decreases from the bulk to the nanodimensional state. The variation in the forbidden band Eg width of the samples during transition from bulk powder to NP has been considered. The spectral luminescent characteristics of the samples in polycrystalline and nanoamorphous states have been examined. It was shown that the ligand field around Eu2+ changes during the bulk→nano transition. This can be due to the violation of translational symmetry in NP. The bonding of the 4f and 5d electrons weakens. The 2eg level degenerates.
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