Eu3+ 이온이 첨가된 Na2Mg(PO3)4 형광체의 분광학 특성

Abstract

Phosphors of Na2Mg(PO3)4 doped with Eu3+ ions were prepared by solid state reaction method. Luminescence properties of Na2Mg(PO3)4:Eu3+(0, 0.01, 0.1, 1, 10 and 20 mol %) crystals were investigated by optical and laser excitation spectroscopy. The thermogravimetric (TG) and differential thermal analysis (DTA) measurements were performed to analyze physical, chemical and thermal properties of phosphors. The X-ray powder diffraction (XRD) analysis was used to analyze the structural characteristics of the Na2Mg(PO3)4:Eu3+phosphors. The charge transfer (CT) band due the transition of O2- - Eu3+ is observed in the UV region 200 – 280 nm. The excitation lines are observed at 297, 317, 361, 382, 393, 414 and 464 nm due to the 7F0 → 5H2, 7F0 → 5H7, 7F0 → 5D4, 7F0 → 5L7, 7F0 → 5L6, 7F0 → 5D3 and 7F0 → 5D2 transitions, respectively. The strongest excitation line corresponding to the 7F0 → 5L6 transition is observed at 393 nm. The emission spectrum exhibits the lines at 596, 612, 651 and 697 nm due to the 5D0 → 7F1, 5D0 → 7F2, 5D0 → 7F3 and 5D0 → 7F4 transitions, respectively. The strongest emission line at 615 nm attributed to the induced electric dipole 5D0 → 7F2 transition. The luminescence intensity increases with Eu3+ concentration up to 20 mol%.