{"id":134,"date":"2021-03-09T15:54:45","date_gmt":"2021-03-09T07:54:45","guid":{"rendered":"http:\/\/www.ustb.cc\/?p=134"},"modified":"2025-10-28T09:51:46","modified_gmt":"2025-10-28T01:51:46","slug":"probing-eu2","status":"publish","type":"post","link":"http:\/\/ustb.cc\/zh\/probing-eu2\/","title":{"rendered":"Probing Eu2+ Luminescence from Different Crystallographic Sites in Ca10M(PO4)7:Eu2+ (M = Li, Na, and K) with \u03b2-Ca3(PO4)2-Type Structure"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><em><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">Chem. Mater.<\/mark><\/strong><\/em>, <strong>2017, 29, 17, 7563\u20137570.<\/strong> <a href=\"https:\/\/doi.org\/10.1021\/acs.chemmater.7b02724\">https:\/\/doi.org\/10.1021\/acs.chemmater.7b02724<\/a><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/pubs.acs.org\/cms\/10.1021\/acs.chemmater.7b02724\/asset\/images\/medium\/cm-2017-02724h_0006.gif\" alt=\"\" style=\"width:249px;height:196px\"\/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Eu<sup>2+<\/sup> local environments in various crystallographic sites enable the different distributions of the emission and excitation energies and then realize the photoluminescence tuning of the Eu<sup>2+<\/sup> doped solid state phosphors. Herein we report the Eu<sup>2+<\/sup>-doped Ca<sub>10<\/sub>M(PO<sub>4<\/sub>)<sub>7<\/sub> (M = Li, Na, and K) phosphors with \u03b2-Ca<sub>3<\/sub>(PO<sub>4<\/sub>)<sub>2<\/sub>-type structure, in which there are five cation crystallographic sites, and the phosphors show a color tuning from bluish-violet to blue and yellow with the variation of M ions. The difference in decay rate monitored at selected wavelengths is related to multiple luminescent centers in Ca<sub>10<\/sub>M(PO<sub>4<\/sub>)<sub>7<\/sub>:Eu<sup>2+<\/sup>, and the occupied rates of Eu<sup>2+<\/sup> in Ca(1), Ca(2), Ca(3), Na(4), and Ca(5) sites from Rietveld refinements using synchrotron power diffraction data confirm that Eu<sup>2+<\/sup> enters into four cation sites except for Ca(5). Since the average bond lengths <em>d<\/em>(Ca\u2013O) remain invariable in the Ca<sub>10<\/sub>M(PO<sub>4<\/sub>)<sub>7<\/sub>:Eu<sup>2+<\/sup>, the drastic changes of bond lengths <em>d<\/em>(M\u2013O) and Eu<sup>2+<\/sup> emission depending on the variation from Li to Na and K can provide insight into the distribution of Eu<sup>2+<\/sup> ions. It is found that the emission band at 410 nm is ascribed to the occupation of Eu<sup>2+<\/sup> in the Ca(1), Ca(2), and Ca(3) sites with similar local environments, while the long-wavelength band (466 or 511 nm) is attributed to Eu<sup>2+<\/sup> at the M(4) site (M = Na and K). We show that the crystal-site engineering approach discussed herein can be applied to probe the luminescence of the dopants and provide a new method for photoluminescence tuning <a href=\"http:\/\/www.east-inflatables.co.nz\/e108-inflatable-tent.html\" style=\"color: grey; text-decoration: none;\">blow up tents nz<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Chem. Mater., 2017, 29, 17, 7563\u20137570. https:\/\/doi.org\/ [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[38,56],"class_list":["post-134","post","type-post","status-publish","format-standard","hentry","category-lab_papers_2017","tag-eu2","tag-56"],"_links":{"self":[{"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts\/134","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=134"}],"version-history":[{"count":4,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts\/134\/revisions"}],"predecessor-version":[{"id":3202,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts\/134\/revisions\/3202"}],"wp:attachment":[{"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/media?parent=134"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/categories?post=134"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/tags?post=134"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}