{"id":2721,"date":"2023-09-19T21:24:49","date_gmt":"2023-09-19T13:24:49","guid":{"rendered":"http:\/\/ustb.cc\/zh\/?p=2721"},"modified":"2023-09-20T10:31:01","modified_gmt":"2023-09-20T02:31:01","slug":"enhancing-external-quantum-efficiency-of-blue-emitting-phosphor-bak-%ce%b2-al2o3eu2-by-lattice-site-engineering-for-full-spectrum-lighting","status":"publish","type":"post","link":"http:\/\/ustb.cc\/zh\/enhancing-external-quantum-efficiency-of-blue-emitting-phosphor-bak-%ce%b2-al2o3eu2-by-lattice-site-engineering-for-full-spectrum-lighting\/","title":{"rendered":"Enhancing External Quantum Efficiency of Blue-Emitting Phosphor Ba(K)-\u03b2-Al2O3:Eu2+\u00a0by Lattice Site Engineering for Full-Spectrum Lighting"},"content":{"rendered":"\n<p class=\"has-small-font-size\"><em>Inorg. Chem.<\/em>&nbsp;2023, 06, 13, 10021\u201310028, <a href=\"https:\/\/doi.org\/10.1021\/acs.inorgchem.3c01405\">https:\/\/doi.org\/10.1021\/acs.inorgchem.3c01405<\/a><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/pubs.acs.org\/cms\/10.1021\/acs.inorgchem.3c01405\/asset\/images\/medium\/ic3c01405_0009.gif\" alt=\"\" style=\"width:286px;height:172px\" width=\"286\" height=\"172\"\/><\/figure>\n<\/div>\n\n\n<p>The discovery of violet-excitable blue-emitting phosphor is a significant breakthrough for the development of phosphor-converted full-spectrum white light-emitting diodes (WLEDs). However, the application of most known violet-excitable blue-emitting phosphors is limited by their low external quantum efficiency (EQE). In this work, we reported on how the EQE values of Eu<sup>2+<\/sup>-doped Ba(K)-\u03b2-Al<sub>2<\/sub>O<sub>3<\/sub>&nbsp;blue-emitting phosphor can be significantly improved through lattice site engineering. By partially substituting K<sup>+<\/sup>&nbsp;for Ba<sup>2+<\/sup>, the Eu<sup>2+<\/sup>-occupied crystallographic site changes and the coordination polyhedron of Eu<sup>2+<\/sup>&nbsp;shrinks, leading to the increase of crystal field splitting. Consequently, the excitation spectrum exhibits a continuous red shift to match the violet excitation, which enhances the PL intensity of solid solution phosphor (Ba<sub>0.4<\/sub>K<sub>1.6<\/sub>)<sub>0.84<\/sub>Al<sub>22<\/sub>O<sub>35\u2212\u03b1<\/sub>:0.32Eu<sup>2+<\/sup>&nbsp;((B<sub>0.4<\/sub>K<sub>1.6<\/sub>)<sub>0.84<\/sub>AO:Eu) by 1.42 times compared to that of the end-member Ba<sub>1.68<\/sub>Al<sub>22<\/sub>O<sub>35\u2212\u03b1<\/sub>:0.32Eu<sup>2+<\/sup>&nbsp;(B<sub>1.68<\/sub>AO:Eu) phosphor. Correspondingly, under the 400 nm violet light excitation, the EQE of optimal blue-emitting (B<sub>0.4<\/sub>K<sub>1.6<\/sub>)<sub>0.84<\/sub>AO:Eu phosphor is up to 53%. Additionally, the phosphor also shows excellent resistance to luminescence thermal quenching (95% at 150 \u00b0C). Finally, the WLED fabricated based on (B<sub>0.4<\/sub>K<sub>1.6<\/sub>)<sub>0.84<\/sub>AO:Eu and commercial green and red phosphors exhibited an ultra-high color rending index with Ra = 95.5 and R1\u2013R15 &gt;90. This work offers guidance for tuning the spectral properties of phosphors through lattice site engineering.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Inorg. Chem.&nbsp;2023, 06, 13, 10021\u201310028, https:\/\/do [&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-2721","post","type-post","status-publish","format-standard","hentry","category-lab_papers_2023"],"_links":{"self":[{"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts\/2721","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=2721"}],"version-history":[{"count":2,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts\/2721\/revisions"}],"predecessor-version":[{"id":2757,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts\/2721\/revisions\/2757"}],"wp:attachment":[{"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/media?parent=2721"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/categories?post=2721"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/tags?post=2721"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}