Luminescence and thermal-quenching properties of silicate-based red-emitting K4CaSi3O9:Eu3+ phosphor.

A series of novel silicate-based red-emitting K₄Ca_{1−<italic>x</italic>}Si₃O₉:<italic>x</italic>Eu³⁺ (<italic>x</italic> = 0.01-0.30) phosphors were successfully synthesized via a high-temperature solid-state reaction method for the first time. The compounds were crystallized in the cubic structure with the space group <italic>Pa</italic>3¯<inline-graphic></inline-graphic>. The photoluminescence spectrum of K₄CaSi₃O₉:Eu³⁺ phosphor shows four peaks assigned to the ⁵D₀-⁷F_J (J = 0, 1, 2, 3 and 4) transitions of Eu³⁺ upon 396 nm excitation. Judd-Ofelt intensity parameters and CIE were calculated from the photoluminescence data. The quenching temperature for K₄CaSi₃O₉:0.30Eu³⁺ was estimated to be above 500 K. The superior thermal stability can be attributed to the rigid structure of the host. The good color saturation and high thermal stability indicate that K₄CaSi₃O₉:Eu³⁺ phosphor is a potential candidate for light-emitting diodes. [ABSTRACT FROM AUTHOR]