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{"title":"Tunable Photoluminescence and Energy Transfer Efficiencynin β‑Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>‑Ca<sub>9</sub>La(PO<sub>4</sub>)<sub>7</sub>:Eu<sup>2+</sup>, Mn<sup>2+</sup> Solid Solution Phosphors Introduced by Emptying Site and StructuralnConfinement Effect for Solid-State Lighting Application","authors":"Shiqi Liu (1354662), Yujun Liang (177976), Xiangjie Ma (8502012), Haoran Li (424403), Weilun Zhang (8502015), Dong Tu (8502018), Yongjun Chen (577347)","doi":"10.1021/acs.inorgchem.9b03021.s001","DOIUrl":"https://doi.org/10.1021/acs.inorgchem.9b03021.s001","url":null,"abstract":"Full visible emissionnachieved by a single-phased system is ofngreat interest to researchers for the development of high-qualitynsolid-state lighting devices. Herein, novel Eu<sup>2+</sup> and Mn<sup>2+</sup> co-doped (1 – <i>x</i>)­β-Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-<i>x</i>Ca<sub>9</sub>La­(PO<sub>4</sub>)<sub>7</sub> solid solution phosphors are designed to realizensingle-phased white light emission. The effects of variational <i>x</i> on lattice structure, color-tunable emission, thermalnstability, and energy-transfer efficiency from Eu<sup>2+</sup> tonMn<sup>2+</sup> are systematically investigated. Tunable color emissionsnare achieved by manipulating the redistributions of Eu<sup>2+</sup> ions among the different cationic sites under the influence of generatednempty site in the M(4) site. Meanwhile, the changes of critical distancesnamong the Eu<sup>2+</sup> and Mn<sup>2+</sup> caused by the variational <i>x</i> results in the changes of energy-transfer efficiency fromndifferent Eu<sup>2+</sup> luminescent centers to Mn<sup>2+</sup> duento the existence of structural confinement effect. The calculatednresults indicate that Eu1–Mn and Eu2–Mn possess highernenergy-transfer efficiencies than other Eu–Mn pairs. Undernthe combined influence of the two effects, single-phased full visiblenwhite emission covering from 400 to 700 nm has been realized via thenadjustment of solid solution, which makes the fabricated white-light-emittingndiode (WLED) possess high color-rendering index (86.9) and R9 (87.2)nas well as low correlated color temperature (3947 K). The resultsnshow that the 0.2β-Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-0.8Ca<sub>9</sub>La­(PO<sub>4</sub>)<sub>7</sub>:0.01Eu<sup>2+</sup>, 0.20Mn<sup>2+</sup> could act as a promising phosphor for single-phasednWLEDs. This work will open up a new avenue for tuning the multiplenactivator sites and energy-transfer efficiencies simultaneously tonrealize single-phased full visible white emission.","PeriodicalId":522912,"journal":{"name":"Figshare","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147906075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}