Efficient Blue–Violet Phosphor with Small Stokes‐Shift for Full‐Spectrum Lighting
Yuhe Shao, Hao Cai, Fangyi Zhao, Zhen Song, Quanlin Liu
Abstract
Abstract Blue–violet phosphor is an essential component to realize full spectrum lighting on the basis of commercial 365 nm N‐UV chip excitation. However, its development falls behind since the phosphor with small stokes‐shift ( ΔS ) is hard to realize. Herein, a new blue–violet phosphor SrSc 4 Si 5 O 17 :Ce 3+ with small ΔS (∼30 nm) is presented. SrSc 4 Si 5 O 17 :Ce 3+ emits bright blue–violet luminescence peaking at 390 nm, and the internal/external quantum efficiency can reach 73.4%/50.4% under 365 nm excitation. The unique luminescence performance of the phosphor is related closely to its crystal structure. The host‐referred bind energy (HRBE) diagram is also successfully constructed to illustrate its thermal quenching behavior. Finally, the packaged white light‐emitting diodes based on the 365 nm N‐UV chip, SrSc 4 Si 5 O 17 :Ce 3+ , and other high‐performance phosphors have an ultra‐high color rendering index ( R a = 95.9), indicating that SrSc 4 Si 5 O 17 :Ce 3+ is a potential candidate for various applications, including indoor healthy lighting and agricultural lighting.