Abstract
A potential ultraviolet light‐emitting diode (UV‐LED) blue phosphor, Li2Sr1−3x/2CexSiO4, was synthesized by firing at 900°C for 4 h in a reducing atmosphere of N2/H2 (5%). The crystal structure and photoluminescence properties of Li2Sr1−3x/2CexSiO4 were reported. On the basis of the Rietveld refinement of X‐ray powder diffraction measurement, the synthesized phosphor is nearly a single‐phase material in the trigonal system with the space group P3121 (No. 152) and Z=3. It is confirmed that Ce3+ occupies the Sr2+ site, which is located in the channels formed by two [SiO4] and three [LiO4] tetrahedral with eight coordination. The Li2Sr1−3x/2CexSiO4 could be efficiently excited by UV light and yielded a blue emission band centered at 442 nm, originating from the 4f 05d1→4f 1 of Ce3+. The concentration quenching occurs at x=0.03 and no shift in emission band is observed with the increase of x value. Upon the 358 nm excitation, the absorption, internal, and external quantum efficiencies are 81%, 81%, and 65.9%, respectively. Furthermore, the sample shows high thermal stability, the luminescence intensity of which, measured at 150°C, maintains about 92% of that at room temperature.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
