{"id":2715,"date":"2023-09-19T21:16:47","date_gmt":"2023-09-19T13:16:47","guid":{"rendered":"http:\/\/ustb.cc\/zh\/?p=2715"},"modified":"2023-09-20T10:50:52","modified_gmt":"2023-09-20T02:50:52","slug":"highly-quantum-efficient-and-thermally-stable-near-infrared-emitting-k-%ce%b2-al2o3cr3-phosphor-2","status":"publish","type":"post","link":"http:\/\/ustb.cc\/zh\/highly-quantum-efficient-and-thermally-stable-near-infrared-emitting-k-%ce%b2-al2o3cr3-phosphor-2\/","title":{"rendered":"Highly Quantum Efficient and Thermally Stable Near-Infrared-Emitting K-\u03b2-Al2O3:Cr3+\u00a0Phosphor"},"content":{"rendered":"\n<p class=\"has-small-font-size\">Advanced Optical Materials 2023, 08, 31\uff0c <a href=\"https:\/\/doi.org\/10.1002\/adom.202301579\">https:\/\/doi.org\/10.1002\/adom.202301579<\/a><\/p>\n\n\n\n<p>Near-infrared (NIR) phosphors are enablers for NIR phosphor-converted light-emitting diodes (pc-LEDs). However, fewer NIR-emitting phosphors with both high internal\/external quantum efficiency (IQE\/EQE) and thermal stability are discovered, which obstructs the promotion of NIR pc-LEDs. Herein, by partially replacing Al<sup>3+<\/sup>&nbsp;in K-\u03b2-Al<sub>2<\/sub>O<sub>3<\/sub>:2Cr<sup>3+<\/sup>&nbsp;with Ga<sup>3+<\/sup>, the photoluminescence (PL) intensity of the solid solution K<sub>1+\u03b4<\/sub>(Al<sub>0.4<\/sub>Ga<sub>0.6<\/sub>)<sub>11<\/sub>O<sub>17<\/sub>:2Cr<sup>3+<\/sup>, (KA<sub>0.4<\/sub>G<sub>0.6<\/sub>O:Cr) phosphor is increased 2.75 and 1.25 times that of end-members K<sub>1+\u03b4<\/sub>Al<sub>11<\/sub>O<sub>17<\/sub>:2Cr<sup>3+<\/sup>&nbsp;(KAO:Cr) and K<sub>1+\u03b4<\/sub>Ga<sub>11<\/sub>O<sub>17<\/sub>:2Cr<sup>3+<\/sup>&nbsp;(KGO:Cr). The IQE\/EQE of optimal KA<sub>0.4<\/sub>G<sub>0.6<\/sub>O:Cr reaches 88.9%\/50.8% with high thermal stability (77.4%@150&nbsp;\u00b0C). The PL intensity enhancement is due to the Al\/Ga-6O octahedral volume and distortion variation caused by the substitution of Ga<sup>3+<\/sup>&nbsp;for Al<sup>3+<\/sup>&nbsp;in K<sub>1+\u03b4<\/sub>(Al<sub>1-y<\/sub>,Ga<sub>y<\/sub>)<sub>11<\/sub>O<sub>17<\/sub>:2Cr<sup>3+<\/sup>&nbsp;(KA<sub>1-y<\/sub>G<sub>y<\/sub>O:Cr), which leads to the forbidden&nbsp;<em>d\u2013d<\/em>&nbsp;transition being broken and crystal field strength varied. Finally, a NIR pc-LED device fabricated based on KA<sub>0.4<\/sub>G<sub>0.6<\/sub>O:Cr NIR-emitting phosphor and blue chip reaches an electro-optical efficiency of 16.3% under a drive current of 100&nbsp;mA. Meanwhile, non-destructive detection and plant germination applications of the NIR pc-LED are demonstrated. These results prove that KA<sub>0.4<\/sub>G<sub>0.6<\/sub>O:Cr is a promising NIR phosphor for diverse applications.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Advanced Optical Materials 2023, 08, 31\uff0c https:\/\/doi.or [&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-2715","post","type-post","status-publish","format-standard","hentry","category-lab_papers_2023"],"_links":{"self":[{"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts\/2715","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=2715"}],"version-history":[{"count":2,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts\/2715\/revisions"}],"predecessor-version":[{"id":2762,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/posts\/2715\/revisions\/2762"}],"wp:attachment":[{"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/media?parent=2715"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/categories?post=2715"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/ustb.cc\/zh\/wp-json\/wp\/v2\/tags?post=2715"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}