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

Autor(es)

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

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Optical Materials; v. 84, p. 123-129, OCT 2018.
• Citações Web of Science: 4

Resumo

{[}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)

• Processo FAPESP: 15/19210-0 - Hidróxidos duplos lamelares (LDH) nanoestruturados com propriedades de up e down-conversion para aplicações como sensibilizadores em células solares
• Beneficiário: Danilo Mustafa
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores