Europium‐Activated KSrPO 4 –( Ba , Sr ) 2 SiO 4 Solid Solutions as Color‐Tunable Phosphors for Near‐ UV Light‐Emitting Diode Applications

This article reports the structural and luminescence characteristics of Eu 2+ ‐activated solid solutions of ( KSrPO 4 ) 1− x ·(( Ba , Sr ) 2 SiO 4 ) x for 0 ≤ x ≤ 1. These phosphors were prepared by a sol‐gel/Pechini method. The lattice parameters of the solid solutions are linearly dependent on x . The reliability factor from Rietveld analysis is nearly constant and independent of x , indicating KSrPO 4 ·( Ba , Sr ) 2 SiO 4 forms an ideal solid solution. The emission spectra consist of two distinct broad bands, which depend on x : blue ranging from 430 to 470 nm and green–yellow ranging from 515 to 570 nm. Both emission peaks red‐shift as x increases due to the crystal field effect and an anomalous transition. The emission intensity of these solid solutions is also a function of x and is comparable to that of LiCaPO 4 : Eu 2+ ( QE = 81%) at x = 0.1, suggesting that these color‐tunable solid solutions are promising for applications in solid‐state white lighting.