Novel double perovskite Sr3WO6:Sm3+, Na+ orange-red emitting phosphors with high thermal stability for white LEDs

Abstract

Over the years, phosphor-converted white light-emitting diodes (pc-WLEDs) have attracted much attention due to their excellent luminescent performance. Meanwhile, there is an intent requirement for studying novel red phosphors for WLED with good luminescence properties and without harsh synthesis methods. In this work, a kind of novel double perovskite Sr3WO6:Sm3+, Na+ phosphor was synthesized with a solid-state reaction. The phase purity, morphology, luminescent properties of synthesized phosphors were investigated systematically. At 407 nm excitation, the Sr3WO6:Sm3+, Na+ phosphors exhibited orange-red light (655 nm) attributed to the transition of 4G5/2 → 6H7/2. The optimal doping concentration was 0.02 mol. The quenching temperature (T0.5) of Sr3WO6:0.02Sm3+, 0.02Na+ phosphor was beyond 500 K, which showed the excellent thermal stability of this phosphor. A WLED was fabricated with the phosphor, and related parameters were obtained. The fabricated WLED had a high general color rendering index (Ra = 89) and good correlated color temperature (CCT) (5297 K). Therefore, Sr3WO6:Sm3+, Na+ phosphors were promising candidates for near-ultraviolet (NUV) chip-based WLED and solid-state lighting.