Contrast factor for light

S(q) = KiMmC S(q) with the contrast factor for light , Ki, being given by... 

The fundamental idea is to determine the solubility parameter of the polymer, and then to use tabulated results to identify a number of solvents that have solubility parameters close to this value. The list of potential solvents is then narrowed to two or three candidates. Solvents that are too volatile, too toxic, too flammable, too expensive, and so on can be removed from the list. Other criteria would depend on the nature of the studies to be pursued. If the objective is to carry out light-scattering measurements, the need for maximizing the contrast factor would make the index of refraction of the solvent an additional important consideration. 

Chapters 7-9 report new strategies to improve the characteristics of organic display, such as the contrast and the mechanical flexibility. Indeed high contrast and mechanical flexibility are the real factors which make these devices strongly competitive with those based on liquid crystals. In conclusion, chapter 10 shows the technology to fabricate efficient white light OLEDs for lighting applications. In particular, the various techniques to improve the... 

---