Color‐Tunable Luminescence of Y 4 Si 2 N 2 O 7 :Ce 3+ , Tb 3+ , Dy 3+ Phosphors Prepared by the Soft‐Chemical Ammonolysis Method

Enhancement of luminescence, thermal stability and quantum efficiency with Ce3+ co-doped SrMg1·06Al9·94O17:Tb3+ phosphor

In this study, the photoluminescence properties of a series of SrMg_1·06Al_9·94O₁₇ (SMAO):Ce³⁺, Tb³⁺, and SMAO:Tb³⁺ phosphors were investigated. At an excitation wavelength of 230 nm, the SMAO:Tb³⁺ phosphor emitted green light at 544 nm. When Ce³⁺ ions were co-doped into SMAO:Tb³⁺, the excitation band red-shifted from 230 to 269 nm, and the emission intensity was enhanced up to approximately 28 times compared with that of Ce³⁺-free SMAO:Tb³⁺ because of the efficient energy transfer from Ce³⁺ → Tb³⁺ in the SMAO host. Moreover, with the introduction of Ce³⁺, the thermal stability of the phosphors improved significantly. The luminescence intensity of the SMAO:3 mol%Tb³⁺ phosphor at 450 K was approximately 47% of that at room temperature. With the co-doping of Ce³⁺ ions, the emission intensity at 450 K was as high as 67%. The internal quantum efficiency (IQE) of SMAO:3 mol%Tb³⁺, 3 mol%Ce³⁺ increased to 55.14%. The SMAO:Tb³⁺,Ce³⁺ phosphors have potential applications in solid-state lighting.

Luminescence, energy transfer and tunable color of Ce3+,Dy3+/Tb3+ doped BaZn2(PO4)2 phosphors

Tunable emission from blue to bluish white and green can be realized by energy transfer and changing the doping concentrations of Dy³⁺ and Tb³⁺ in BaZn₂(PO₄)₂ phosphors.