Thermally stable Sm³⁺ doped SrCeO₃ single-phase white phosphor with Y³⁺ sensitization for fabricating wLEDs

The pioneering study reveals the transformative power of co-doping in enhancing phosphor performance, focusing on the development of a cutting-edge white phosphor: SrCeO₃:0.02Sm³⁺ co-doped with Y³⁺ (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 Y³⁺ sensitization on the crystalline phases, morphology, elemental composition, band gap energy, and luminescence properties, the study discovered that orthorhombic SrCeO₃:0.02Sm³⁺: Y³⁺ perovskites exhibit exceptional crystallinity and peak luminescence at 1.5 wt% Y³⁺. The CIE color diagram confirmed their bright white light emission across all samples. This breakthrough positions nano-perovskite SrCe_0.965Sm_0.02O₃:1.5 wt% Y³⁺ 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.