Growth and optical characterization of PbMo 0.5 W 0.5 O 4 single crystals for UV optoelectronic applications

Abstract PbMo 0.5 W 0.5 O 4 single crystals were successfully grown via the conventional Czochralski method, and their structural and optical properties were comprehensively investigated. x-ray diffraction analysis confirmed the phase purity and tetragonal scheelite-type structure with lattice parameters determined to be a = 5.3209 Å and c = 12.8099 Å. UV–Visible absorbance and transmission spectroscopy revealed a sharp absorption edge, indicative of a direct allowed electronic transition. The band gap energy was determined to be around 3.15 eV using Tauc plot analysis, supported by relatively low Urbach energy, suggesting minimal structural disorder. Photoluminescence measurements showed prominent green emission peaks at 488 and 512 nm, attributed to intrinsic structural defects and radiative recombination processes. The high optical quality and tunable band gap of PbMo 0.5 W 0.5 O 4 make it a promising candidate for ultraviolet optoelectronic devices and photocatalytic applications.