“…The distinct properties of semiconductor materials give rise to promising applications in solar cells [1], light-emitting diodes [2], smart windows [3], gas sensing [4] and other optical applications [5]. Metal tungstates are important semiconductors which have been studied for many years because of their potential applications in photoluminescence [6], catalysis [7], optics [8], humidity sensors [9,10], dosimetry [11], magnetic applications [12], etc.…”