Effect of Mn doping into the octahedral WO<sub>6</sub> unit on the yellow-orange coloration of triclinic LiCeW<sub>2</sub>O<sub>8</sub>

A novel environmentally friendly inorganic yellow-orange pigment, LiCeW 2-x Mn x O 8- (0 x 0.07), was synthesized and its optical and color properties were investigated.By partially substituting Mn, a promising source of orange-red coloration, into the octahedrally coordinated W site of the LiCeW 2 O 8 host lattice, the absorption intensity of d-d transitions associated with W and Mn in octahedral coordination was modulated, thereby enabling control over light reflection in the visible spectrum.X-ray photoelectron spectroscopy and Rietveld refinement suggested that the electronic states of the constituent elements may have influenced the d-d transition absorption intensities of W (6-)+ and Mn (4-)+ species, thereby altering the overall light absorption behavior.As a result, the reflectance of LiCeW 1.97 Mn 0.03 O 8- was selectively enhanced in the red region, yielding the most vivid and bright orange pigment.