Energy transfer to Eu(III) in the solid-state low-density polyethylene-poly(acrylic acid) and low-density polyethylene-Fe2O3-poly(acrylic acid) matrices

Autor: Glaucione Gomes De Barros, Maria J. A. Sales, Oswaldo Antonio Serra
Rok vydání: 2000
Předmět:
Zdroj: Journal of Applied Polymer Science. 78:919-931
ISSN: 1097-4628
0021-8995
DOI: 10.1002/1097-4628(20001024)78:4<919::aid-app270>3.0.co;2-x
Popis: Ion exchange between H + and Eu 3+ and/or Tb 3+ was studied in the material modified by in situ sorption and thermal polymerization of acrylic acid in low-density polyethylene (LDPE-PAA) and in the composite system LDPE-Fe 2 O 3 -PAA. Fluorescence spectroscopy showed evidence of Eu 3+ and/or Tb 3+ ion exchanges in these materials. The matrix LDPE-PAA after Eu(III) ion exchange presented luminescence (excitation 265 nm). This was explained by an energy-transfer process from the matrix LDPE-PAA to Eu 3+ ions. The LDPE-PAA matrix after simultaneous Eu 3+ /Tb 3+ ion exchange exhibited Eu 3+ and Tb 3+ ion luminescence (excitation 265 nm), confirming an energy-transfer process from LDPE-PAA to Eu 3+ ions in LDPE-PAA-Eu 3+ -Tb 3+ matrix. Fe 2 O 3 in LDPE-Fe 2 O 3 -PAA quenched the matrix for excitation at 265 nm and no emission at the region 400 nm was observed. The luminescence of Tb 3+ ions in the matrix LDPE-Fe 2 O 3 -PAA-Tb 3+ (excitation 265 nm) was partially quenched by Fe 2 O 3 . However, a weak emission of Eu 3+ ions was observed (excitation 265 nm) in the matrix LDPE-Fe 2 O 3 -PAA after simultaneous Eu 3+ and Tb 3+ ion exchanges, suggesting an energy transfer from Tb 3+ to Eu 3+ ions.
Databáze: OpenAIRE
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