Journal
MATERIALS RESEARCH BULLETIN
Volume 107, Issue -, Pages 280-285Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2018.07.036
Keywords
Luminescence; pc-LEDs; Quantum efficiency
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - the Ministry of Science, ICT and Future Planning [NRF-2018R1A2B6005179]
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A series of single phased phosphors Sr8MgLa(PO4)(7): Eu2+, Mn2+, Tb3+ were synthesized by solid state reaction methods for applications of white light emitting diodes(w-LEDs). The broad absorption band at the near ultraviolet (NUV) region of 250-450 nm was obtained, which is ascribed to the 4f(7) -> 4f(6)5d(1) electronic transition of the Eu2+ ions. Under NUV excitation, the broad yellow emission was obtained from tri-activated Sr8MgLa(PO4)(7) phosphors via combining three emission bands centered at 500, 550, and 600 nm contributed by Eu2+, Tb3+ and Mn2+, respectively. The optimized concentrations of Mn2+ and Tb3+ were 6 mol%, respectively, which enhanced the total PL intensity up to 30% comparing to only Eu2+ doped phosphor. Moreover, the quantum efficiency of Sr8MgLa(PO4)(7): Eu2+, Mn2+, Tb3+ phosphor had achieved up to 52%. The combination of a NUV chip with compound of Sr8MgLa(PO4)(7): Eu2+, Mn2+, Tb3+ and BaMgAl10O17:Eu2+ achieved tunable w-LEDs with high CAI. The results suggest that this single phased Sr8MgLa(PO4)(7): Eu2+, Mn2+, Tb3+ phosphor can be a key for the phosphor converted w-LEDs for warm white light emission.
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