کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1260640 | 971751 | 2016 | 6 صفحه PDF | دانلود رایگان |
This paper reported a novel synthetic route to Eu2+ doped SrSiN2 deep red phosphors for white light-emitting diodes. A series of single-phased and high-efficiency SrSiN2:Eu2+ red phosphors were synthesized based on this method. Their structure, morphology, luminescence, quantum efficiency (QE) and thermal quenching properties were investigated and compared with those of SrSiN2: Eu2+ prepared by the conventional route. It was found that the addition of a small amount of Si3N4 could promote the formation of SrSiN2 from Sr2Si5N8 phase. A highly uniform rod-shaped morphology was obtained based on this method. The X-ray powder diffraction and the Rietveld refinement analysis identified the preferential crystalline orientation growth. Under the blue light excitation, Eu2+ doped SrSiN2 phosphors showed excellent optical properties. Compared with those prepared by the conventional approaches, the external QE of SrSiN2:Eu2+ phosphor was greatly improved, allowing it a promising phosphor for white LEDs.
Graphical AbstractPhotoluminescence spectra excited at 460 nm of Sr0.97Eu0.03SiN2 phosphors for various temperatures (a), temperature-dependent emission intensity of Sr0.97Eu0.03SiN2 phosphors and (Sr0.97Eu0.03)2Si5N8 phosphors (b) and different connection types of SiN4 tetrahedra (c)Figure optionsDownload as PowerPoint slide
Journal: Journal of Rare Earths - Volume 34, Issue 1, January 2016, Pages 30–35