Pure white light

Fig. 4.30 shows the 1931 CIE chromaticity diagram, with coordinates corresponding to the emission from electrophosphorescent PLEDs data points are shown for devices (open circles) biased at different current densities. In Fig. 4.30, the dotted line indicates different color temperatures the dotted oval indicates the approximate area where the human eye perceives the color as white. The CIE coordinates for the Ir(HFP)3 PFO-F(l%) PFO devices are (0.352, 0.388) at J = 1 mA/cm2, very close to the CIE coordinates for pure white light, (0.333, 0.333). The CIE coordinates show only minor shifts at different J. The stability of the CIE coordinates as a function of the brightness and applied voltage is much better than reported previously for PLEDs/OLEDs [11, 50-55]. 

Fig. 4.30 CIE (1931) chromaticity diagram, with coordinates corresponding to the emission from white-emitting devices (O O O) biased at different current densities. Also shown are the equienergy point (E) for pure white light (0.333,...

Highly efficient pure-white-light-emitting diodes from a single polymer polyfluorene with naphthalimide moieties. Adv. Eunct. Mater. 16,101-106. 

Fig. 5.12. White light spectra obtained from pure water and from water doped with minute quantities of the salivary protein,a-amylase. Note the suppression of the blue-side of the spectrum upon addition of the protein...

Figure 3. The three pure spectral colors, the prime-colors, uniquely related to normal human vision. Combined, as shown here, they form a white-light mixture the color of sunlight.

Transient spectra of solvated indole are measured in a 120 Jim liquid jet with a crosscorrelation of 80 fs by means of a white light continuum (450 - 740 nm) generated in a sapphire disc. The molecules are excited at 270 nm with pump pulses generated by frequency doubling the output of a noncollinearly phase matched optical parametric amplifier [2], Due to the short pump pulses there is a small yet finite probability for two-photon ionization in pure solvents. This allows us to study the spectral properties of the generated solvated electrons by measurements in pure solvents. The transient spectra of the indole solution are corrected for these solvent contributions. 

The iodide is a pure white crystalline solid which is sensitive to light and moisture, Heating it with silver powder in vacuo at 280°C produces SiaI and silver iodide. The compound dissolves without reaction in dry hydrocarbons. 

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