A reverse coprecipitation route for preparing Na2WO2F4:Mn4+ phosphor with high yield. Issue 7 (1st April 2023)

• Record Type: Journal Article
• Authors: Ji, Haipeng; Qu, Qiao; Zhang, Wenrui; He, Lulu
• Is Part Of: Ceramics international. Volume 49:Issue 7(2023)
• Page Start: 11730
• Page End: 11735
• Publication Date: 2023-04-01
• Subjects: Phosphor -- Mn4+ -- Reverse coprecipitation -- Oxyfluoride; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2023.01.022
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: For the coprecipitation preparation of the Na2 WO2 F4 :Mn 4+ phosphor, we propose a new reverse approach, i.e., adding the precursor solution into a precipitant, which efficiently induces the precipitation of the targeted composition with much higher yield than a conventional forward approach. NaHF2 occurred as a secondary phase due to the high HF concentration in the precursor solution but was successfully avoided by varying the precipitant from alcohols to acetic acid. The as-precipitated Na2 WO2 F4 :Mn 4+ phosphor exhibits strong zero phonon line emission (ZPL) at 619 nm; the ZPL/ν6 (Stokes) intensity ratio varies from 137% to 73%, depending on the type and amount of the precipitant, the reason for which is ascribed mainly to the nonstoichiometry of Na + . This reverse coprecipitation approach could be applicable to prepare any other oxyfluoride compositions with considerable solubility.