Brightness, comparison

Figure 11.3 Brightness comparison for tetramethylrhodamine isothiocyanate (TRITC), TRITC-doped silica nanoparticles (20 nm), and CdSe/ZnS quantum dots (28 nm diameter).27 (Reprinted with permission from H. Ow et al., Nano Lett., 2005, 5, 113-117. Copyright 2005 American Chemical Society.)...

Qualitative screening and semiquantitative analysis. Based on R value and color brightness comparison between samples and standards. 

Fig. 2. Curves 1, 2, and 3 show the spectral radiance factor for equivalent coatings of separate toluenesulfonamide—melamine—formaldehyde Day-Glo pigments containing 0.5% of a dye, either Alberta Yellow, Rhodamine F5G, or Rhodamine B Extra. Curve 4 is for a bright nonfluorescent red-orange printing ink. The illuminant was Source C. A magnesium oxide-coated block was used as a comparison white.

Light is measured in several ways. Until about 1960, most light measurements were obtained by visual comparison. A standard light source of known, but adjustable, brightness was compared by a trained... 

Shuman, C. A., Alley, R. B., Anandakrishnan, S. et al. (1995). Temperature and accumulation at the Greenland Summit Comparison of high-resolution isotope profiles and passive microwave brightness temperature trends. /. Geophys. Res. 100(D5), 9165-9177. 

Saturation is the clarity of a color. It can also be understood as the intensity of hue in comparison to brightness. A saturated color looks clear and bright an unsaturated color appears pale, muddy, or dull. 

Fraction 4 (P.E./CHjClj, 1 1) was a bright red solution the T1 NMR spectrum of which indicated a mixture of two acetylenic constituents (A and B) which were separated by preparative TLC on 1 mm silica gel plates. The red band (A), when left in soln for 15 hr at r.t., lost its color. The Tl NMR spectrum of the decolored soln was identical with the spectrum of compound B. Comparison of the physical data (1H NMR and MS) of the two compounds with the spectral data reported for the dithiophene (A) (10) and the thiophene (B)... 

Dichroic ratios are very useful to describe the PL emission from a physiological point of view (e.g., brightness of a device as perceived by the human eye), and we have attempted to consistently employ this representation throughout this text. Most authors express DRE as a ratio of intensities at a given wavelength, usually at a maximum of the emission spectrum, and, unless otherwise stated, we here follow this convention. However, quite frequently the emission spectra of p- and s-polarized are not identical, so that it would be more appropriate to compare the integrated emission spectra in order to allow for an apple-to-apple comparison. 

W. A. Wyatt, F. V. Bright and G. M. Hieftje, Characterization and comparison of three fiber-optic sensors for iodide determination based on dynamic fluorescence quenching ofrhodamine 6G, Anal. Chem. 59, 2272-2276 (1987). 

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