Ultraviolet-A electroluminescence from polymorphic CaSiO3:Ce3+ in electrolyte-thin film semiconductor

The realization of ultraviolet (UV) radiation lighting is emerging as a crucial method for water disinfection and particular fine matters. In particular, using UV sources as a small-scale disinfection option for water purification in remote areas is a growing trend. Herein, the study of UV electrolyte-assisted electroluminescence has been presetting by using Ce3+-activated polymorphic CaSiO3 as an emitting layer. It is prepared through an all-air atmosphere processes sol-gel-based spin coating method followed by a high-temperature rapid thermal annealing. Under an AC source in an aqueous electrolyte, the film is capable of emitting a UV-A spectrum attributed to the spin-allowed transition of Ce3+ ions. According to the spectrum, this device exhibits identical emission spectra in voltage and frequency dependency in AC sinusoidal driving voltage. With such a new method to obtain UV sources, this study could provide further development in silicon semiconductors, especially in the optoelectronics matter.