Tunable warm white light emission and energy transfer of Dy3+ co‐doped Sr2LaZrO5.5:Eu3+ phosphors

AbstractEu3+,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+ had a cubic structure. At an excitation wavelength of 290 nm, the substrate Sr2LaZrO5.5 exhibited strong blue emission at 468 nm, and the Sr2LaZrO5.5:18%Eu3+ phosphor exhibited a strong red emission peak at 612 nm. When the doping amount of Dy3+ was 5, 8, 12, 15, or 18%, the Sr2LaZrO5.5:18%Eu3+ phosphor changed from an orange‐red light, to a warm white light, and to a cold white light. According to the emission spectra, the emission intensities of the substrates Sr2LaZrO5.5 and Sr2LaZrO5.5:Eu3+ decreased with increasing Dy3+ concentration, confirming the energy transfer between the host Sr2LaZrO5.5‐Eu3+,Dy3+, and resulting in a lower CCT value, with significantly improved white light emission.