15 октомври 2021
Brunckova, H., Mudra, E., Rocha, L., Nassar, E., Nascimento, W., Kolev, H., Lisnichuk, M., Kovalcikova, A., Molcanova, Z., Strečckova, M., Medvecky, L..
(
Христо Колев;
)
Abstract
This study presents the synthesis, structural and luminescence properties for lanthanide metal–organic frameworks (LnMOFs), which belong to the sub-class of coordination polymers. The series of nanosized LnMOFs (Ln = Eu, Gd, Tb, Eu0.5Gd0.5, Tb0.5Gd0.5 and Eu0.5Tb0.5) was prepared by solvothermal synthesis using a modulator (sodium acetate). We investigated the various surface chemistry compositions of the isostructural LnMOFs with a [Ln(btc)] structure (BTC: Benzene-1,3,5-tricarboxylate) by X-ray photoelectron spectroscopy (XPS). The XPS confirmed the mixed-valent Eu3+ and Eu2+ compounds, and the presence of Tb in both +3 and +4 valence states, and one +3 valency of Gd. A nanostructure of mixed LnMOFs (EuGd, TbGd and EuTb) with a rod-like shape is related to luminescence properties. The MOFs (EuTb and EuGd) presented Comission Internationale de l’?clairage (CIE) chromaticities of x = 0.666 and y = 0.331, and x = 0.654 and y = 0.348, respectively, in the red region. They were better than the values desired for use in commercial phosphors, which are x = 0.64 and y = 0.35. For [Tb/Gd(btc)], the CIE coordinates were x = 0.334 and y = 0.562, presenting emissions in the green region. Bimetallic LnMOFs are very promising UV light sensors for biological applications.
Inorganics, 9, 10, MDPI, 2021, ISSN:23046740, DOI:10.3390/inorganics9100077, 77. SJR (Scopus):0.65, JCR-IF (Web of Science):2.662 Q2 (Scopus)
https://www.mdpi.com/2304-6740/9/10/77
Назад...
