A PROCESS FOR THE SYNTHESIS OF YELLOW EMITTING EU3+ ACTIVATED K2CA(PO4)3F PHOSPHOR FOR MOSQUITO REPELLENT LAMP

The present invention is related to a process for the synthesis of yellow emitting Eu3+ activated K2Ca(PO4)3F phosphor for mosquito repellent lamp. A modified solid-state reaction method is employed for the preparation of these phosphors, involving the introduction of Eu3+ ions in concentrations ranging from 0.5 to 3.0 mol%. The resultant phosphors exhibit a distinctive ultraviolet (UV) excitation band, primarily attributed to charge transfer (O2 → Eu3+), making them ideal for lighting applications. The emission spectra display multiple bands, with a prominent yellow emission at 571 nm. The phosphors are characterized by CIE chromaticity coordinates within the yellow region (approximately 0.496, 0.503), confirming their suitability for use in mosquito repellent lamps. Additionally, emission intensity is optimized through the controlled variation of Eu3+ ion concentration, as demonstrated by a concentration quenching curve. This invention offers an approach to producing effective mosquito-repelling illumination, thereby addressing a significant challenge in public health and comfort.