EPR 측정에 의한 CaMgSi₂O6 : Eu²+ 형광체의 열적 안정성 연구

다국어 초록 (Multilingual Abstract)

The blue-color emitting phosphor powder, CaMgSi₂O_6 : Eu²+(CMS : Eu²+), was synthesized by the solid-state reaction method. The synthesized powder was annealed from room temperature to 1,100℃ in air. Its PL property and valence state of Eu atoms was measured by the photoluminescence (PL) and the electron paramagnetic resonance (EPR) spectrometers, respectively. The PL intensity was stable to 700℃, but drastically decreased to 1,100℃. The behavior of EPR intensity was very similar to the PL intensity. The EPR measurement showed that decreased intensity of the PL was caused to the oxidation from the ion Eu²+ to Eu³+ ions. The EPR spectrometer was powerful as a tool that could distinguish between the valence states of Eu atom as a dopant in various phosphors.