{"id":2719,"date":"2023-09-19T21:23:19","date_gmt":"2023-09-19T13:23:19","guid":{"rendered":"http:\/\/ustb.cc\/zh\/?p=2719"},"modified":"2023-09-20T10:32:12","modified_gmt":"2023-09-20T02:32:12","slug":"intervalence-charge-transfer-of-cr3-cr3-aggregation-for-nir-ii-luminescence","status":"publish","type":"post","link":"http:\/\/ustb.cc\/zh\/intervalence-charge-transfer-of-cr3-cr3-aggregation-for-nir-ii-luminescence\/","title":{"rendered":"Intervalence charge transfer of Cr3+-Cr3+\u00a0aggregation for NIR-II luminescence"},"content":{"rendered":"\n<p class=\"has-small-font-size\">Light:Science &amp; Applications, 2023, 07, 25, https:\/\/www.nature.com\/articles\/s41377-023-01219-x<\/p>\n\n\n\n<p>The increasing demand for high-contrast biological imaging, non-destructive testing, and infrared night vision can be addressed by the development of high-performance NIR light-emitting materials. Unlike lanthanide (Ln<sup>3+<\/sup>) with sharp-line multiplets and isolated Cr<sup>3+<\/sup>&nbsp;with NIR-I emission, this study reports the first-ever NIR-II broadband luminescence based on the intervalence charge transfer (IVCT) of Cr<sup>3+<\/sup>-Cr<sup>3+<\/sup>&nbsp;aggregation in gallate magentoplumbite. In particular, LaMgGa<sub>11<\/sub>O<sub>19<\/sub>:0.7Cr<sup>3+<\/sup>&nbsp;exhibits dual-emission (NIR-I, 890 nm and NIR-II, 1200 nm) with a full width at half maximum (FWHM) of 626 nm under 450 nm blue LED excitation. Moreover, this dual-emission exhibits anti-thermal quenching behavior (432% @ 290 K), attributed to the energy transfer among multiple Cr<sup>3+<\/sup>&nbsp;centers. Cryogen absorption spectra, lifetimes decay (2.3 ms), and electron paramagnetic experiments reveal the NIR-II luminescence of the Cr<sup>3+<\/sup>-Cr<sup>3+<\/sup>&nbsp;\u2192 Cr<sup>2+<\/sup>-Cr<sup>4+<\/sup>&nbsp;IVCT transition. The application of LaMgGa<sub>11<\/sub>O<sub>19<\/sub>:0.7Cr<sup>3+<\/sup>&nbsp;in NIR-II biological imaging as an optical contrast agent, non-destructive testing, and night vision is demonstrated. This work provides new insights into broadband NIR-II luminescence under UV-NIR excitation based on the IVCT of Cr<sup>3+<\/sup>-Cr<sup>3+<\/sup>&nbsp;aggregation.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Light:Science &amp; Applications, 2023, 07, 25, https:\/ [&hellip;]<\/p>\n","protected":false},"author":20,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[174],"tags":[],"class_list":["post-2719","post","type-post","status-publish","format-standard","hentry","category-lab_papers_2023"],"_links":{"self":[{"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts\/2719","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\/20"}],"replies":[{"embeddable":true,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/comments?post=2719"}],"version-history":[{"count":2,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts\/2719\/revisions"}],"predecessor-version":[{"id":2759,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts\/2719\/revisions\/2759"}],"wp:attachment":[{"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/media?parent=2719"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/categories?post=2719"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/tags?post=2719"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}