Thermally stable Sm3+ doped SrCeO3 single-phase white phosphor with Y3+ sensitization for fabricating wLEDs
C.K. Shilpa, S.V. Jasira, V. P. Veena, S. Sajith, A.M. Huda Thasneem, K Greeshma, S S Ancy, Sakthivel Pandurengan, K.M. Nissamudeen
Abstract
The pioneering study reveals the transformative power of co-doping in enhancing phosphor performance, focusing on the development of a cutting-edge white phosphor: SrCeO 3 :0.02Sm 3+ co-doped with Y 3+ (0–2 wt%) for high-CRI white LED applications. These innovative perovskites were synthesized using a low-temperature fuel-excess gel combustion technique, with citric acid as the fuel and ammonium nitrate as an additional oxidizer. By examining the impact of Y 3+ sensitization on the crystalline phases, morphology, elemental composition, band gap energy, and luminescence properties, the study discovered that orthorhombic SrCeO₃:0.02Sm 3+ : Y 3+ perovskites exhibit exceptional crystallinity and peak luminescence at 1.5 wt% Y 3+ . The CIE color diagram confirmed their bright white light emission across all samples. This breakthrough positions nano-perovskite SrCe 0.965 Sm 0.02 O 3 :1.5 wt% Y 3+ as a top candidate for direct phosphor coatings on near-UV LED chips, and its practical utility promises significant advancements in energy-efficient lighting technology.