Synthesis and spectroscopic characterization of the K4BaSi3O9:Eu3+

• New K4BaSi3O9:Eu3+ compound was successfully obtained by the conventional solid state reaction.
• The excitation, emission spectra and decay time of the emitting level of Eu3+ have been analyzed.
• K4BaSi3O9:Eu3+ has high temperature quenching of the emission T0.5 = 335 °C and low energy transfer between dopant ions.
• K4BaSi3O9:Eu3+ is a good candidate for red phosphor.

K4BaSi3O9:Eu3+ polycrystals were synthesized by solid state method. X-ray powder diffraction measurements confirmed structure of the samples. The excitation and the emission spectra of orthorhombic K4BaSi3O9 doped with Eu3+ were investigated. The excitation spectrum exhibits a broad band with maximum at 220 nm corresponding to the charge transfer (CT) transition between O2− and Eu3+ ions and smaller 4f–4f transitions. The emission of investigated phosphor was excited at 395 nm and has quantum efficiency (QE) equal 27%. The emission maximum at 616.5 nm was assigned to the 5D0 → 7F2 transition of Eu3+ ions. The luminescence decay profiles as well as the thermal quenching were measured and analyzed. K4BaSi3O9:Eu3+has high temperature quenching of the emission T0.5 = 335 °C.

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