Abstract

A series of Eu3+ undoped/doped germinate phosphors NaY1−xEuxGeO4 (0 ≤x ≤ 1) were synthesized by a solid-state reaction at high-temperature. Their phase structures and luminescence properties were examined by powder X-ray diffraction method, Rietveld structure-refinements and photoluminescence measurements. Under 300 nm excitation, with increasing doping concentration of Eu3+, these as-prepared phosphors showed adjustable luminous color from blue to red, which was induced by Eu3+-concentration-dependent energy transfer behavior from host to Eu3+. Upon excitation with 464 nm, the optimal-component NaY0.5Eu0.5GeO4 phosphor presented characteristic red luminescence resulting from dominant 5D0→7F2 transition of Eu3+, which was with millisecond-level lifetime and excellent thermal stability. Finally, on the basis of the current NaY0.5Eu0.5GeO4 phosphor, a red LED device was fabricated, emitting bright red light driven by certain voltage and current. The results showed the as-prepared NaYGeO4:Eu3+ red phosphor have possible application prospect in the field of solid state lighting.

Full Text
Paper version not known

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 call

Disclaimer: 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.