Pr3+ions, another alternative near-infrared luminescence emitter though energy transfer from Eu2+for NIR pc-LEDs

Near-infrared (NIR) light-emitting diodes (LED) have garnered significant research attention worldwide. This research presents a novel near-infrared phosphor doped with Pr3+ ions, exhibiting a broad NIR emission ranging from 800 to 1100 nm. Under 450 nm excitation, Li3Cs2Ba2B3P6O24:Pr3+ material generates near-infrared emission bands peaking at 882 and 1038 nm. However, this material exhibits relatively lower luminous intensity. Through Eu2+ co-doping, the NIR emission intensity of Li3Cs2Ba2B3P6O24:Pr3+ is significantly enhanced due to energy transfer. Photoluminescence spectra and luminescence decay curves support the efficient energy transfer (ET) between Eu2+ and Pr3+, resulting in remarkable NIR luminescence. The study evaluates the temperature stability and practical application of Li3Cs2Ba2B3P6O24:Eu2+, Pr3+ in near-infrared LED applications. Consequently, Pr3+ ions emerge as an alternative near-infrared luminescence emitter though energy transfer from Eu2+, offering new insights into developing NIR light sources for broadband NIR pc-LED applications.