An efficient UV converted blue-emitting Lu2CaGeO6:Bi3+ persistent phosphor for potential application in photocatalysis. Issue 12 (15th August 2018)

• Record Type: Journal Article
• Authors: Liu, Zhiwu; Ding, Yanfeng; Meng, Chaocan Zheng Yuan; Tang, Jing; Qiu, Qianping
• Is Part Of: Ceramics international. Volume 44:Issue 12(2018)
• Page Start: 14712
• Page End: 14716
• Publication Date: 2018-08-15
• Subjects: Lu2CaGeO6 -- Bi3+ -- Photoluminescence -- Persistent phosphor -- Photocatalysis; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.05.099
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Nowadays, exploring new photonic materials that can efficiently convert the invisible light into the visible light have attracted tremendous attention in the catalytic field. Here, we design and prepare a kind of Bi 3+ doped Lu2 CaGeO6 phosphor by using the solid-state reaction at 1250 °C in air for 5 h. The structural analysis, which is based mainly on the powder X-ray diffraction (XRD) spectra, shows that the as-prepared Bi 3+ doped Lu2 CaGeO6 phosphors belong to a trigonal structure with a space group of R 3 (No. 146). The photoluminescence (PL) results reveal that changing the excitation wavelengths from 240 nm to 340 nm does not change the emission sharp and position of the Bi 3+ doped samples, allowing the maximum emission intensity to keep at 420 nm. Except for the fluorescence, up exposure to the UV light ( e.g., 254 nm), the Lu2 CaGeO6 :Bi 3+ phosphors can also exhibit the Bi 3+ -related blue afterglow luminescence. The longest afterglow duration that corresponds to the 1.5%Bi 3+ doping content in the Lu2 CaGeO6 crystal host can last 30 min in the dark. After comparing the Bi 3+ -related blue afterglow band to the band gap of TiO2 semiconductor that corresponds to the wavelength of 387 nm, it clearly indicates us that the Bi 3+ doped Lu2 CaGeO6 phosphors can serve as a continous excitation source for light-sensitive TiO2 semiconductor for photocatalysis application.