Eu3+ or Sm3+-Doped terbium-trimesic acid MOFs: Highly efficient energy transfer anhydrous luminophors

Author(s)

Silva, I. G. N. ^[1] ; Cunha, C. S. ^[2] ; Morais, A. F. ^[1] ; Brito, H. F. ^[2] ; Mustafa, D. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Phys, BR-05508090 Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, BR-05508000 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: Optical Materials; v. 84, p. 123-129, OCT 2018.
• Web of Science Citations: 4

Abstract

{[}Tb(TMA):RE3+] MOFs (MOF: Metal Organic Framework; TMA: trimesic acid or 1,3,5-benzenetricarboxylic acid, RE3+: Eu and Sm) with tunable color were synthesized by aqueous coprecipitation method. Using a chemical artifice, lanthanide cationic radius contraction, it was possible to obtain only anhydrous MOFs, a very important characteristic in luminescent compounds. TMA(3-) anions triplet states present higher energy levels compared to the main emitting states of Eu3+ (D-5(0)), Tb3+ (D-5(4)) and Sm3+ ((4)G(5/2)), supplying an efficient antenna effect. Based on the spectroscopic investigation, i.e. excitation/emission spectra and lifetimes of the excited states, the material shows a high quantum efficiency (eta = 83-86%) due to the very efficient energy transfer process TMA -> Tb -> Eu, combined to the presence of this high energy absorption ligand and the absence of water molecules. (AU)

• FAPESP's process: 15/19210-0 - Nanostructured double layered hydroxides with up e down-conversion properties for applications as sensitizers in solar cells
• Grantee: Danilo Mustafa
• Support Opportunities: Research Grants - Young Investigators Grants