Enhance Luminescence of SrBPO5: Sm3+ Phosphor by Codoping Alkali Metal for White LEDs

An orange reddish phosphor SrBPO 5 :Sm 3+ was synthesized by the traditional solid-state method.The phosphor component was characterized by the X-ray powder diffraction (XRD).The photoluminescence excitation (PLE) and emission spectra (PL) were investigated.The influence of the concentration of Sm 3+ ions on luminescence properties of samples and concentration quenching mechanism were investigated.The results show that the as-prepared phosphor can be excited by 342 nm, 358 nm, 370 nm and 399 nm UV light and the strongest one at 399 nm.On being excited by 399 nm, the sample emits yellow, orange and red emission at different wavelength.The optimal activator molar fraction in this phosphor is 0.016 and the only sintering temperature is 1000℃.It is meant for enhancing the emission intensity of SrBPO 5 :Sm 3+ phosphor if appropriate Li + ions are added as charge compensator.The thermal stability was evaluated by emission spectra of phosphor at different measuring temperatures.This research studied the influence of reaction temperature and charge compensator on the luminescence characteristics.The chromaticity coordinates of SrBPO 5 :Sm 3+ , R + phosphor was explored.The results indicate that SrBPO 5 :Sm 3+ , Li + is a potential orange-reddish phosphor in near UV based white LEDs.