Mn⁴⁺, Eu³⁺ Co-doped K_0.3La_1.233MgWO₆: A Potentially Multifunctional Luminescent Material

Mn4+, Eu3+ co-doped magnesium lanthanum potassium tungstate (KLaMgWO6) phosphors have been prepared by a high-temperature solid-state reaction method. Partial substitution of K+ sites with La3+ and Li+ in the A site of KLaMgWO6: Mn4+ results in 9.7 times and 7.4 times increase in the intensity of Mn4+ emission at 697 nm under blue light excitation, respectively. Strong emission of Eu3+ (613 nm) is observed in the Mn4+, Eu3+ co-doped K0.3La1.233MgWO6 without weakening the emission of Mn4+, and the total emission intensity of the Mn4+, Eu3+ co-doped sample is enhanced by about 40% as compared with that of K0.3La1.233MgWO6:0.006Mn4+. More importantly, the fluorescence intensity ratio (IMn/IEu) in the Mn4+, Eu3+ co-doped K0.3La1.233MgWO6 phosphor increases monotonously not only with temperature but also with excitation wavelength within a certain range. The unique characteristics of the Mn4+, Eu3+ co-doped K0.3La1.233MgWO6 phosphor might provide a lot of possible application including plant growth lighting, optical temperature sensing, and wavelength detection.