A direct warm-white-light CaLa(MoO): Tb, Sm phosphor with tunable color tone via energy transfer for white LEDs
RSC Advances, ISSN: 2046-2069, Vol: 5, Issue: 95, Page: 77866-77872
2015
- 38Citations
- 10Captures
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Article Description
A series of Tb, Sm co-doped CaLa(MoO) phosphors have been prepared via a solvothermal method without further sintering. The CaLa(MoO):1% Tb, x% Sm (x = 0.0-5.0) phosphors were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM) and photoluminescence (PL) spectra. Upon 277 nm excitation, the phosphors exhibit strong green emission of the Tb ions and red-orange emission of the Sm ions, the quenching concentration of Sm is determined to be about 4%. The critical distance between Tb and Sm has been calculated to be about 14.3 Å and the energy transfer from Tb to Sm occurs through a dipole-dipole interaction. The color tone of the obtained phosphors is easily modulated from blue to cool-white, green, and ultimately to warm-white-light. Furthermore, the relationship between the value of CCT for warm-white-light and the rare earth ion (Tb, Sm) concentration was investigated in detail. These results reveal that this kind of phosphor is a potential candidate for white LEDs.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84942015135&origin=inward; http://dx.doi.org/10.1039/c5ra09947a; http://xlink.rsc.org/?DOI=C5RA09947A; http://pubs.rsc.org/en/content/articlepdf/2015/RA/C5RA09947A; https://xlink.rsc.org/?DOI=C5RA09947A; https://dx.doi.org/10.1039/c5ra09947a; https://pubs.rsc.org/en/content/articlelanding/2015/ra/c5ra09947a
Royal Society of Chemistry (RSC)
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