Study on improving the performance of Gd2O2S: Er3+, Yb3+ up-conversion phosphors by Lu3+ introduction

Multi-component luminescence materials (Lu0.09Gd0.91)2O2S: Er3+, Yb3+ with response wavelengths of 980 nm, 1064 nm, and 1550 nm were synthesized by the coprecipitation-high temperature solid-state reaction method. The optimum formula was obtained by the orthogonal experiment method. The effects of Lu3+ on crystal structure, fluorescence intensity, and temperature stability were systematically studied. The phase composition of the phosphors was analyzed by X-ray diffraction. With the increase of Lu3+ concentration, the fluorescence intensity first decreases, then increases slowly to a maximum, and finally decreases sharply. The sample exhibits characteristic emissions of red and green under three wavelengths of excitation. In addition, the up-conversion luminescence mechanisms excited at different wavelengths were discussed by means of the Intensity-Power test. Through a series of temperature spectra, it is found that the introduction of Lu3+ contributes to excellent temperature stability. Subsequently, the decay curve shows that the fluorescence lifetime of 554 nm increases first and then decreases with the increase of Lu3+ concentration, resulting from competition between γ and knr. This provides a useful idea for developing infrared detection materials with excellent temperature stability and luminescence properties.