Abstract
To improve the luminescence properties of Sr2Si5N8:Eu2+ phosphor, Sr2−xY x Si5−xAl x N8:Eu2+ specimens in which Sr2+ and Si4+ were partially substituted with Y3+ and Al3+ were prepared by carbothermal reduction nitridation. The obtained Sr2−xY x Si5−xAl x N8:Eu2+ samples showed standard Sr2Si5N8 structure. The effects of Y3+ and Al3+ partial substitution on the structures and luminescence properties of the resulting specimens were investigated. Under excitation by near UV and blue radiation, Sr2Si5N8:Eu2+ exhibited a broad emission band at about 613 nm, originating from the 4f65d1 → 4f7 transition of Eu2+. As Eu2+ concentration increased, the emission peak positions red-shifted from 606 to 628 nm, occupying two different crystallographic sites labeled as Eu(Sr1) and Eu(Sr2). Also, incorporation of both Y3+and Al3+ ions into Sr2Si5N8:Eu2+ significantly increased the luminescence intensity of Eu2+. This was attributed to modification of the crystal field environment of Eu2+. Overall, the improved luminescence intensities obtained through partial substitution of Sr2+ and Si4+ by Y3+ and Al3+, respectively, indicated the promise of Sr2−xY x Si5−xAl x N8:Eu2+ as red phosphor candidates in white light-emitting diodes at x = 0.16.
Sign-in/Register to access full text options 
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.
