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

Abstract Eu 3+ ,Dy 3+ co‐doped Sr 2 LaZrO 5.5 ‐based phosphors were prepared through a sol–gel method. Through characterization, it was found that the Sr 2 LaZrO 5.5 ‐based fluorescent powder co‐doped with Eu 3+ and Dy 3+ had a cubic structure. At an excitation wavelength of 290 nm, the substrate Sr 2 LaZrO 5.5 exhibited strong blue emission at 468 nm, and the Sr 2 LaZrO 5.5 :18%Eu 3+ phosphor exhibited a strong red emission peak at 612 nm. When the doping amount of Dy 3+ was 5, 8, 12, 15, or 18%, the Sr 2 LaZrO 5.5 :18%Eu 3+ 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 Sr 2 LaZrO 5.5 and Sr 2 LaZrO 5.5 :Eu 3+ decreased with increasing Dy 3+ concentration, confirming the energy transfer between the host Sr 2 LaZrO 5.5 ‐Eu 3+ ,Dy 3+ , and resulting in a lower CCT value, with significantly improved white light emission.