Luminescent and thermal properties of a novel double perovskite La2MgTiO6:Dy3+ phosphors for w-LEDs application.

A novel yellow emitting double perovskite La₂MgTiO₆:Dy³⁺ phosphor was synthesized by a high-temperature solid-phase method. The emission spectra of La₂MgTiO₆:Dy³⁺ phosphor show three emission bands at 479 nm (blue), 573 nm (yellow), and 668 nm (red) at 351 nm excitation owing to the ⁴F_9/2-⁶H_15/2, ⁴F_9/2-⁶H_13/2, and ⁴F_9/2-⁶H_11/2 energy level jumps of Dy³⁺ ions, respectively. The concentration quenching of the phosphor sample at x = 0.07 mol is caused by dipole–dipole interaction. La₂MgTiO₆: Dy³⁺ phosphor has superior thermal stability with a luminous intensity of 85.6% at 423 K. The activation energy of the Dy³⁺ ion is 0.18 eV. The Commission Internationale de I'Eclairage (CIE) coordinates for the phosphors were calculated in the white light region, and the correlated color temperature (CCT) values are in the range of 4376–4586 K for warm white light. The results show that La₂MgTiO₆:Dy³⁺ phosphors may be a potential for application in w-LEDs. [ABSTRACT FROM AUTHOR]