Effects of La3+ doping on the optical characteristics and color tunability of (Mg,Mn)(Y,Ce, La)4Si3O13 phosphors

The doping effects of La³⁺ ions on the photoluminescence properties and color tunability of (Mg, Mn)(Y, Ce, La)₄Si₃O₁₃ phosphors have been elaborated in this study. On increasing the La³⁺ concentration in the host, tunability of excitation wavelength is achieved first, which in turn leads to the blue shift in the wavelength of Ce³⁺ emission. The high-energy emission shift of Ce³⁺ ions results from the change in the crystal field around Ce³⁺ ions. With the incorporation of La³⁺ ions, the chromaticity coordinates shift towards white-light region showing the tunable characteristics. Moreover, the correlated color temperature (CCT) change from warm white to cool white light region with different concentration of La³⁺ ions. The variation of different excitation wavelength tunes the emission thus augmenting the probability of (Mg, Mn)(Y, Ce, La)₄Si₃O₁₃ phosphors for potential application in optical devices.