{"id":57,"date":"2021-03-09T14:21:13","date_gmt":"2021-03-09T06:21:13","guid":{"rendered":"http:\/\/www.ustb.cc\/?p=57"},"modified":"2025-10-28T09:25:13","modified_gmt":"2025-10-28T01:25:13","slug":"structure-and-luminescence-of-ca2si5n8eu2-phosphor-for-warm-white-light-emitting-diodes","status":"publish","type":"post","link":"http:\/\/ustb.cc\/zh\/structure-and-luminescence-of-ca2si5n8eu2-phosphor-for-warm-white-light-emitting-diodes\/","title":{"rendered":"Structure and luminescence of Ca2Si5N8:Eu2+ phosphor for warm white light-emitting diodes"},"content":{"rendered":"\n<p><strong><em><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">Chin. Phys. B.<\/mark><\/em>, 2009,18, 8, 3555.<\/strong> <a href=\"https:\/\/iopscience.iop.org\/article\/10.1088\/1674-1056\/18\/8\/070\">https:\/\/iopscience.iop.org\/article\/10.1088\/1674-1056\/18\/8\/070<\/a><\/p>\n\n\n<p style=\"text-align: justify;\">We have synthesized Ca<sub>2<\/sub>Si<sub>5<\/sub>N<sub>8<\/sub>:Eu<sup>2+<\/sup>\u00a0phosphor through a solid-state reaction and investigated its structural and luminescent properties. Our Rietveld refinement of the crystal structure of Ca<sub>1.9<\/sub>Eu<sub>0.1<\/sub>Si<sub>5<\/sub>N<sub>8<\/sub>\u00a0reveals that Eu atoms substituting for Ca atoms occupy two crystallographic positions. Between 10 K and 300 K,\u00a0Ca<sub>2<\/sub>Si<sub>5<\/sub>N<sub>8<\/sub>:Eu<sup>2+<\/sup>\u00a0phosphor shows a broad red emission band centred at ~1.97 eV\u20132.01 eV. The gravity centre of the excitation band is located at 3.0 eV\u20133.31 eV. The centroid shift of the 5d levels of Eu<sup>2+<\/sup>\u00a0is determined to be ~1.17 eV, and the red-shift of the lowest absorption band to be ~0.54 eV due to the crystal field splitting. We have analysed the temperature dependence of PL by using a configuration coordinate model. The Huang\u2013Rhys parameter S = 6.0, the phonon energy hv = 52 m eV, and the Stokes shift \u0394S = 0.57 eV are obtained. The emission intensity maximum occurring at ~200 K can be explained by a trapping effect. Both photoluminescence (PL) emission intensity and decay time decrease with temperature increasing beyond 200 K due to the non-radiative process <a href=\"https:\/\/www.east-aufblasbar.de\/e102020-hupfburg-mit-wasserrutsche.html\" style=\"color: grey; text-decoration: none;\">h\u00fcpfburg mit wasserrutsche<\/a>.<\/p>\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Chin. Phys. B., 2009,18, 8, 3555. https:\/\/iopscience.io [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"aside","meta":{"footnotes":""},"categories":[16],"tags":[38],"class_list":["post-57","post","type-post","status-publish","format-aside","hentry","category-lab_papers_2009","tag-eu2","post_format-post-format-aside"],"_links":{"self":[{"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts\/57","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/comments?post=57"}],"version-history":[{"count":4,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts\/57\/revisions"}],"predecessor-version":[{"id":3186,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts\/57\/revisions\/3186"}],"wp:attachment":[{"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/media?parent=57"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/categories?post=57"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/tags?post=57"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}