A series of Li_1-xZn_0.9-xPO₄:Mn_0.1, Al_x phosphors are prepared by the solid-state method to obtain a new green-yellow phosphor that can be applied for the light emitting diodes (LED). XRD results confirm that the samples contain LiZnPO₄ phase of crystals. Photoluminescence properties of the samples are characterized with photoluminescence of excitation (PLE) and emission spectra (PL), and the effect of Al³⁺ doping on the PL and PLE properties of Li_1-xZn_0.9-xPO₄:Mn_0.1, Al_x phosphors is discussed. The results indicate that the dependent curve of relative intensity for PLE and PL on Al³⁺ doping concentration is a parabola curve with mouth downward and maximum value, and the optimal molar concentration of Al³⁺ for the samples is 3%,with corresponding sample being Li_0.97Zn_0.87PO₄:Mn_0.1, Al_0.03. The research results indicate that the peak area of emission bands of Li_1-xZn_0.9-xPO₄:Mn_0.1, Al_x with the optimal x is 3.98 times of that of sample with x=0. The fact suggests that the Al³⁺ ions can enhance the emission of Mn²⁺. Furthermore, Al³⁺ doping only affects the intensity of Mn²⁺ emission, and cannot influence its mode. The value for chromaticity coordinate of Li_0.97Zn_0.87 PO₄:Mn_0.1, Al_0.03 indicates that it is a green-yellow emitting phosphor, which can be potentially useful as a UV excited phosphor for LEDs.

inorganic compounds  /  phosphates  /  phosphor  /  luminescence  /  optical materials