Abstract:
Novel yellow inorganicpigments Sr2Ce1¹xTbxO4 (x=0,
0.2, 0.4, 0.6, 0.8, and 1.0) were synthesized by the conventional
solid-state route. The structure and morphology ofthe developed
pigments were characterized using powder X-ray diffractometer
(XRD) and scanning electron microscope (SEM), respectively.
AUVvisNIR spectrophotometer was employed toinvestigate
the optical properties, and the color characteristics were
evaluated by CIE 1976L*a*b*color scales. The Tb substitution
extends the absorption edge tolonger wavelengths by introducing an additional electroniclevel between the valence and
conduction bands. Consequently, the prepared pigments exhibit
various yellow colors byfine tuning ofthe band gap from 3.03
(white) to 2.52 eV (reddish-greenish yellow). Doping ofTbinto
Sr2CeO4enhances the NIR reflectance at 1100 nmfrom 87%to
91%. The coloring performance of the synthesized pigments
wasinvestigated in the polymer matrix for plasticcoloring
applications. The exhibition of high NIR reflectance with
comparablecolor properties of these pigments makes them
potentialcandidates as coolcolorants to reduce the heat build-up
