“…The PL spectra of Zn 2 V 2 O 7 depicted in Fig. 5 contained an emission peak around 553.65 nm, which can be attributed to the charge transfer transition in the VO 4 tetrahedra due to defects/vacancies [31,37,38]. These studies have shown that Zn 2 V 2 O 7 is a promising material for light-emitting diodes and flat panel displays optoelectronic devices.…”