Dy3+/Eu3+/Nb5+doped NaGdSb2O7 phosphors greatly enhance white light emission

In this paper, a new phosphor NaGdSb2O7 (NGSO) was synthesized by high-temperature solid-phase method, and the transition from cold white light to warm white fluorescence emission was realized by studying the luminous intensity of Dy and Eu under different doping and adjusting the doping ratio of Dy and Eu. In addition, when Nb partially replaces Sb, the band gap of the sample changes, the band structure is changed, and the light intensity is enhanced. The symmetry of the crystal lattice is changed, and the crystal structure is gradually asymmetrical, which promotes the gradual enhancement of fluorescence intensity. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy, absorption spectroscopy and fluorescence lifetime were used to measure the parameters of phase purity, valence state, photoluminescence, absorption emission cross-section and fluorescence decay time. All experimental results show that NGSO: Dy, Eu, Nb phosphors have potential application value in the field of white light-emitting diodes (LEDs).