[Influence of inert nuclei (La3+, Y3+ and Gd3+) on fluorescence of europium complex with phenylglyoxylic acid and phenathroline].
Three series of dinuclear complexes (Eux RE(1-x) L3 phen) of phenylglyoxylic acid and phenathroline with different molar ratios of Eu3+ to inert nuclei (RE = La3+, Y3+ and Gd3+) were synthesized. Their excitation and emission spectra were studied. The excitation spectra showed that the optimum excitation wavelengths of the complexes are all in the range of 350-360 nm, which belong to the excitation peaks of ligands, and the weak excitation peak of Eu3+ is at about 398 nm; The emission spectra showed that there are five emission bands at about 583, 595, 617, 654 and 703 nm respectively for all the complexes, due to (5)D0 - (7)F0, (5)D0 - (7)F1, (5)D0 - (7)F2, (5)D0 - (7)F3 and (5)D0 - (7)F4 transitions of Eu3+ respectively. The authors also found that the emission peak positions of Eu3+ shift the most in the complexes Eu(x) La(1-x) L3 phen, the position of (5)D0 - (7)F2 transition shifts 5.2 nm when the molar ratio of Eu3+:La3+ is 0.3: 0.7, but the addition of Y3+ and Gd3+ makes the emission peak positions of Eu3+ change less than that of La3+. Meanwhile the luminescence intensity of Eu3+ can be most enhanced by La3+ in all the complexes. The conclusion we found in the present paper could help search the luminescence materials with low cost and good luminescence properties.
Zhang
Yan-hui
YH
Department of Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China. suhb@eyou.com
Yan
Jian-bo
JB
Yan
Xiao-qi
XQ
Pei
Juan
J
Geng
Xiao-tian
XT
Zhao
Ying
Y
Wang
Yun-you
YY
Sun
Bo
B