Improved luminescent properties of SrZn₂(PO₄)₂:Sm³⁺ doped with Li⁺, Na⁺ and K⁺ ions

Abstract

SrZn₂(PO₄)₂:Sm³⁺ phosphor was synthesized by a high temperature solid-state reaction in atmosphere. SrZn₂(PO₄)₂:Sm³⁺ phosphor is efficiently excited by ultraviolet (UV) and blue light, and the emission peaks are assigned to the transitions of ⁴G_5/2-⁶H_5/2 (563 nm), ⁴G_5/2-⁶H_7/2 (597 nm and 605 nm) and ⁴G_5/2-⁶H_9/2 (644 nm and 653 nm). The emission intensities of SrZn₂(PO₄)₂:Sm³⁺ are influenced by Sm³⁺ concentration, and the concentration quenching effect of SrZn₂(PO₄)₂:Sm³⁺ is also observed. When doping A⁺ (A=Li, Na and K) ions, the emission intensity of SrZn₂(PO₄)₂:Sm³⁺ can be obviously enhanced. The Commission Internationale de l'Eclairage (CIE) color coordinates of SrZn₂(PO₄)₂:Sm³⁺ locate in the orange-red region. The results indicate that the phosphor has a potential application in white light emitting diodes (LEDs).

Keywords

Emission Intensity / Electric Dipole / Nonradiative Energy Transfer / Magnetic Dipole Transition / Multipolar Interaction

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