희토류 이온이 첨가된 바나듐산염과 이중 페로브스카이트 형광 특성 연구

Abstract

Luminescence properties Eu3+ and Pr3+ doped in Ca2LaNbO6, Ba2BiV2PO11, Ba2GdV3O11, Ba2LaV3O11 and Ba2YV3O11 phospohrs. The samples were synthesized by high temperature solid-state reaction method. Crystal structures and crystallinity of the samples with different Eu3+ and Pr3+ concentration were analyzed by X-ray diffraction. The samples of Eu3+ doped Ba2BiV2PO11, Ba2GdV3O11, Ba2LaV3O11 and Ba2YV3O11 form solid solutions up to 100 mol % Eu3+ concentration, while that of Ca2LaNbO6 maintains crystal structure only up to 15 mol %. Excitation and emission spectra of the samples of Eu3+ and Pr3+ doped Ca2LaNbO6, Ba2BiV2PO11, Ba2GdV3O11, Ba2LaV3O11, Ba2YV3O11 and Pr3+ ions were measured at room temperatures. The strongest emission intensity of Eu3+-doped samples are observed at arouond 620 nm due to the 5D0 → 7F2 transition. The visible emission of Pr3+ ions in Ca2LaNbO6 are observed at around 500 and 650 nm due to the 3P0 → 3H4 transition and the 3P0 → 3F2 transition, respectively. The near infrared (NIR) emission spectrum of Ca2LaNbO6:Pr3+ phosphors are also observed in the wavelength region 800 - 1200 nm corresponding to the 3P0 → 1G4, 1D2 → 3F2, 1D2 → 3F4,3, and 1D2 → 1G4 transitions.