Tunable warm white light emission and energy transfer of Dy³⁺ co‐doped Sr₂LaZrO_5.5:Eu³⁺ phosphors

Abstract

Eu3+, Dy3+ co‐doped Sr2LaZrO5.5‐based phosphors were prepared through a sol‐gel method. Through characterization, it was found that the Sr2LaZrO5.5 based fluorescent powder co doped with Eu3+and Dy3+has a cubic structure. At an excitation wavelength of 290 nm, the substrate Sr2LaZrO5.5 exhibits strong blue emission at 468 nm, and the Sr2LaZrO5.5:18 % Eu3+phosphor exhibits a strong red emission peak at 612 nm. When the doping amount of Dy3+ is (5, 8, 12, 15, 18 %), the Sr2LaZrO5.5:18 % Eu3+phosphor changes from orange red light, warm white light, and cold white light. According to the emission spectra, the emission intensities of the substrates Sr2LaZrO5.5 and Sr2LaZrO5.5: Eu3+ decrease with increasing Dy3+ concentration, confirming the energy transfer between the host Sr2LaZrO5.5‐Eu3+‐Dy3+, resulting in a lower CCT value, significantly improved white light emission.