The Structure and Optical Properties of Luminescent Terbium Terephthalate Metal–Organic Frameworks Doped with Yttrium, Gadolinium, and Lanthanum Ions

• Published in: Crystals (Basel) Vol. 14; no. 11; p. 966
• Main Authors: Petrova, Anna S., Butorlin, Oleg S., Toikka, Yulia N., Kolesnikov, Ilya E., Orlov, Sergey N., Ryazantsev, Mikhail N., Bogachev, Nikita A., Skripkin, Mikhail Yu, Mereshchenko, Andrey S.
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.11.2024
• Subjects: Aqueous solutions; Chloride; Electron microscopes; Ethylenediaminetetraacetic acid; Gadolinium; Lanthanum; Ligands; luminescence; Metal-organic frameworks; metal–organic framework; Morphology; Optical properties; Photoluminescence; Porous materials; rare earth; Rare earth elements; Rare earth metals; Spectrum analysis; terbium; Terephthalate; Thermal stability; Yttrium; Japan; Russia; Germany
• ISSN: 2073-4352; 2073-4352
• DOI: 10.3390/cryst14110966

The structural features and luminescent properties of heterometallic Tb–Gd, Tb–La, and Tb–Y terephthalate metal–organic frameworks, namely (TbxM1−x)2(1,4-bdc)3∙4H2O (M = Gd, La, Y), were studied in detail in a wide concentration range (x = 0.001–1). The crystalline phase of synthesized compounds corresponds to Ln2(1,4-bdc)3·4H2O. The lifetime of 5D4 decreased with increased Tb3+ concentration, but PLQY depends non-linearly on the Tb3+ concentration. The 50% substitution of Tb3+ for Y3+, Gd3+, or La3+ ions result in the significant enhancement of photoluminescence quantum yield, up to 1.6 times. The morphology, thermal stability, and vibrational structure of the selected homo- and bi-metallic materials is reported as well.