Emission wavelength shifts

Glazer, A.N., and Stryer, L. (1983) Fluorescent tandem phycobiliprotein conjugates Emission wavelength shifting by energy transfer. Biophys. /. 43, 383-386. 

Chlorine containing compounds such as hexachloroethane are often added to star compositions because metal-chloride species such as CuCl are relatively stable in the flames and because the emission wavelengths shift in such a way as to produce better colours. 

The effect of HP and MHP concentration on fluorescence intensity. The amino acid concentration was fixed, and the MHP concentration varied. This revealed that the fluorescence intensity of the amino acids was remarkably quenched, and the emission wavelength shifted to a shorter wavelength. It was especially remarkable to D, L- (or L-) tryptophan, but the excitation wavelength was unchanged (Fig. 1). 

As a consequence the band gap decreases, so that the emission wavelength shifts to the ted. Actually Zno.eBCdo.32S Ag is a gieen-. and Zno.i3Cdoa7S Ag+ a red-emitting cathode-ray phosphor. The emission color is not determined by the nature of the luminescent center, but by the value of the band gap. Figure 7.2 shows the chromaticity diagram with three phosphors from the (Zn,Cd)S Ag+ family. 

Figure 1-19, which contains some of the results obtained by Faessler and Goehring,41 shows what information about chemical constitution the x-ray emission process can yield under favorable circumstances. In this simple case, wavelength shift and line intensity are both useful, the latter in the less obvious way explained below. 

By flourescence techniques, it was observed that the fluorescence yield and lifetime of 1,8-anilinonaphthalenesulfonate decrease with an increase in the aqueous core of AOT-reversed micelles, while the position of the emission maximum shifts to longer wavelengths [64], These changes in the electronic properties were attributed to the peculiar effective polarity and viscosity of the micellar core and to their evolution with R. 

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