Optical properties of yellow-emitting Sr3LaNb3O12:Dy3+ phosphors with an abnormal thermal quenching for white light-emitting diode applications

In this study, a series of Sr3LaNb3O12 phosphors doped with Dy3+ ions was prepared by a high-temperature solid-state reaction. The crystal structure, phase purity, particle morphology, photoluminescence (PL) properties, and thermal stability of the phosphors were described. And the Sr3LaNb3O12 crystal symmetry is hexagonal. Under the optimal excitation wavelength of 352 nm, the three prominent emission peaks of the Sr3LaNb3O12:Dy3+ focused on 483 nm (F-4(9/2)-H-6(15/2)), 575 nm (F-4(9/2)-H-6(13/2)), and 668 nm (F-4(9/2)-H-6(11/2)). The optimal Dy3+-doped concentration in the Sr3LaNb3O12 phosphor was 0.05 mol. The phosphor had an abnormal thermal quenching phenomenon and activation energy (E-a = 0.29 eV). The prepared white light-emitting diode (w-LED) had a low correlation color temperature of 4162 K, chromaticity coordinates (0.365, 0.368), and the color rendering index 91. The feasibility of the Sr3LaNb3O12:Dy3+ luminescent material for w-LED was verified by its performance.

Automated summary

A series of Sr3LaNb3O12 phosphors doped with Dy3+ ions were prepared and characterized in this study, showing promising photoluminescence properties under 352 nm excitation. The optimal Dy3+-doped concentration was found to be 0.05 mol, and the prepared white LED exhibited a low color temperature and high color rendering index, demonstrating the feasibility of Sr3LaNb3O12:Dy3+ luminescent material for LED applications.