Structure, site-occpancy and luminescent properties of a novel blue phosphor Na_3ZrMgP_3O_(12): Eu~(2 +)

摘要

Single-phase Na3ZrMgP3O12: Eu2+(NZMP: Eu2+) phosphor was preparedviahigh-temperature solid-state reaction. The crystal structure, lattice parameters and occupied sites of Eu2+-doped Na3ZrMgP3O12are elucidated by powder X-ray diffraction and Rietveld refinement. It is found that majority of Eu2+ions occupy 8-coordianted Na2 site while minority of Eu2+are in 6-coordianted Na1 site of NZMP host. NZMP: Eu2+shows a strong blue emission broadband with peak at 450 nm under UV excitation, which can be decomposed into two sub-bands peaking at 446 and 474 nm based on the substitution of two kinds of Na+sites by Eu2+ions. Luminescence properties of NZMP: Eu2+phosphors were investigated in detail, including excitation and emission spectra, decay lifetime, concentration quenching and temperature-dependent emission spectra.