Luminescent Properties of Terbium(Ⅲ) and Europium(Ⅲ) Complexes with Six 4-Acetyl-bispyrazolones

doi:10.1007/s40242-014-3380-z

Abstract

Abstract:

The lowest triplet energy levels of the six ligands(T) were determined to be 22989 cm^-1[1,3-bis-(1'-phenyl-3'-methyl-5'-pyrazolon-4')-1,3-propanedione, BPMPTD], 23148 cm^-1[1,4-bis-(1'-phenyl-3'-methyl-5'- pyrazolon-4')-1,4-butanedione, BPMPBD], 23419 cm^-1[1,5-bis-(1'-phenyl-3'-methyl-5'-pyrazolon-4')-1,5-pentane-dione, BPMPPD], 23310 cm^-1[1,6-bis-(1'-phenyl-3'-methyl-5'-pyrazolon-4')-1,6-hexanedione, BPMPHD], 21978 cm^-1[1,9-bis-(1'-phenyl-3'-methyl-5'-pyrazolon-4')-1,9-nonanedione, BPMPND] and 21930 cm^-1[1,10-bis-(1'-phenyl-3'-methyl-5'-pyrazolon-4')-1,10-decanedione, BPMPDD], respectively. It was explained satisfactorily that the six ligands are more efficient for sensitizing the luminescence of Tb³⁺ than that of Eu³⁺ at room temperature, and the order of the luminescent intensities for the Tb³⁺ complexes is explained by the relative energy gap between T and ⁵D_J of Tb³⁺ or Eu³⁺. As a conclusion, when 2700 cm^-1<ΔE(T-⁵D₄)<3000 cm^-1, the luminescent intensity of the Tb³⁺ complex is the strongest. This means that the lowest triplet energy level of the ligand is a chief factor to dominate RE³⁺ luminescence.

Key words: Rare earth complex, Optical property, Luminescence

GOU Ruhu, WANG Yaling, YANG Rudong, LAN Yan. Luminescent Properties of Terbium(Ⅲ) and Europium(Ⅲ) Complexes with Six 4-Acetyl-bispyrazolones[J]. Chemical Research in Chinese Universities, 2014, 30(2): 190-193.

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