Color tuning from green to orange-red in SrBPO5: UO22+/Pr3- phosphor via energy transfer for solid-state lighting applications

SrBPO5 doped with Pr3+, UO22+, Pr3+ and UO22+ were prepared through the conventional solid-state reaction route. PXRD and Raman spectroscopy studies confirmed the phase purity of these synthesized phosphors. The particle shape, size and distribution of dopants were studied using SEM and EDX. DFT calculations were carried out to check the suitability of the SrBPO5 host for the phosphor applications. The optical bandgap of the phosphors was obtained from the recorded diffuse reflectance spectra. The orange-red emission of Pr3+ got enhanced significantly in the presence of UO(2)(2+)codopant due to energy transfer from UO22+ to Pr3+. Interestingly, the UO22+ codoping resulted in Stark splitting of Pr3+ emission. The lifetime decay measurements confirmed the energy transfer and the Time-resolved emission spectra suggested dual-site occupancy of the uranyl ion in the SrBPO5 host.

Automated summary

SrBPO5 doped with different ions were successfully prepared and characterized using various techniques. The presence of UO22+ significantly enhanced the emission of Pr3+ and resulted in Stark splitting, suggesting dual-site occupancy of the uranyl ion in the SrBPO5 host.