Europium concentration, emission spectrum

Figure 9. Dependence of emission spectrum of YgOg. Eu on europium concentration. The difference spectrum is defined as the normalized YgOg.Eu (2.8%) spectrum minus that for YgOs. Su (4.0%). This enhances perceptibility of the increased emission (yellow and green lines) in the low Eu concentration...

The Metoclopramide hydrochloride concentration was determined by the optical sensor europium doped in the sol-gel matrix. The absorption and emission spectra of Metoclopramide hydrochloride and Europium were measured in sol-gel matrix. The method depends on the enhancement of the intensity of the emission spectrum of Eu doped in sol-gel especially at 617 nm band. The mechanism depends on the energy transfer from triplet energy state of Metoclopramide hydrochloride to the excited energy state of Eu. In comparison with other spectrofluorimetric techniques, this method is simple, relatively interference free from coexisting substances and can successfully be applied to the determination of Metoclopramide hydrochloride in pharmaceutical preparations and in serum samples the data are summarized in Table 14.3 [53]. 

Until very recently, studies of the use of luminescent lanthanide complexes as biological probes concentrated on the use of terbium and europium complexes. These have emission lines in the visible region of the spectrum, and have long-lived (millisecond timescale) metal-centered emission. The first examples to be studied in detail were complexes of the Lehn cryptand (complexes (20) and (26) in Figure 7),48,50,88 whose luminescence properties have also been applied to bioassay (vide infra). In this case, the europium and terbium ions both have two water molecules... 

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