Efficient Blue–Violet Phosphor with Small Stokes‐Shift for Full‐Spectrum Lighting

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 SrSc4Si5O17:Ce3+ with small ΔS (∼30 nm) is presented. SrSc4Si5O17:Ce3+ 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, SrSc4Si5O17:Ce3+, and other high‐performance phosphors have an ultra‐high color rendering index (Ra = 95.9), indicating that SrSc4Si5O17:Ce3+ is a potential candidate for various applications, including indoor healthy lighting and agricultural lighting.

Progress of Ce3+/Eu2+ doped phosphors for violet chip based full-spectra lighting

“…For the SrSc 4 Si 5 O 17 :Ce 3+ phosphor, the Ce 3+ -doped into the hole surrounded by [ScO 6 ] and [SiO 4 ] polyhedra, the stable coordination environment induced the small Δ S of only 1950 cm −1 . 307 For the (Sr 0.7 Ba 0.3 ) 2 P 2 O 7 :Eu 2+ phosphor, the Eu 2+ doped into the [PO 4 ] surrounded Sr 2+ /Ba 2+ sites resulting in a small Δ S . 283 Heavy atoms stabilize lattice vibration, thereby reducing Δ S .…”

An efficient blue–violet phosphor: an advanced material designed for high-quality full-spectrum lighting

“…14,15 Therefore, the unique combination of a broad emission bandwidth, high quantum efficiency, and the ability to fine-tune emission colors makes Ce 3+ doped phosphors indispensable in the field of pc-WLEDs and other high-performance optical applications. 16,17 However, many previously reported Ce 3+ iondoped blue phosphors still suffer from drawbacks such as low quantum efficiency and poor thermal stability. Examples include BaCa 2 Y 6 O 12 :Ce 3+ (I 423 K /I 298 K = 4.8%), 18 Sr 3 Sc 4 O 9 :Ce 3+ (I 423 K /I 298 K = 19.…”

Color tuning by Si/Ge substitution in Cr4+ doped melilite inorganic pigments

“…To find the appropriate material for the restoration pigments, we focus on the rare-earth or transition metal elements doped inorganic materials [ [5] , [6] , [7] ]. Strontium magnesium melilites have been thoroughly investigated for rare-earth doped luminescence as wLED (white light emitting diode) or persistence phosphors [ 8 , 9 ].…”