Doping chromophore

S2) investigating single crystals 3) considering doped chromophore materials with (inert) host crystals... 

Figure 10.7 o-Ps intensity (I3) versus the concentration of a doping chromophore (D03) in PMMA. The lines in the figure are fitted according to Eq. (7) [42], The values of I3° and Kjnhib are indicated in the figure for both temperatures. 

Recently photorefractivity in photoconductive polymers has been demonstrated (92—94). The second-order nonlinearity is obtained by poling the polymer doped with a nonlinear chromophore. Such a polymer may or may not be a good photoconductor. Usually sensitizers have to be added to enhance the charge-generation efficiency. The sensitizer function of fuUerene in a photorefractive polymer has been demonstrated (93). 

Nanoscale Morphological Change of PS-b-P4VP Block Copolymer Films Induced by Site-Selective Doping of a Photoactive Chromophore... 

As aforementioned, diblock copolymer films have a wide variety of nanosized microphase separation structures such as spheres, cylinders, and lamellae. As described in the above subsection, photofunctional chromophores were able to be doped site-selectively into the nanoscale microdomain structures of the diblock copolymer films, resulting in nanoscale surface morphological change of the doped films. The further modification of the nanostructures is useful for obtaining new functional materials. Hence, in order to create further surface morphological change of the nanoscale microdomain structures, dopant-induced laser ablation is applied to the site-selectively doped diblock polymer films. 

Machida, S., Nakata, H., Yamada, K. and Itaya, A. (2007) Morphological change of a diblock copolymer film induced by selective doping of a photoactive chromophore./, Polym. Sci. B, Polym. Phys. Ed., 45, 368-375. 

Osad ko, Selective Spectroscopy of Chromophore Doped Polymers and Glasses. Vol. 114, pp. 123-186. 

Results are shown in Figure 5. Samples of PVCa were doped with 10% by weight of poly(1-vinylnaphthalene) to determine if the naphthalene chromophore would serve as a quencher for the surface oxidation of PVCa as it appears to do in the case of fluid solutions. 

Many of the linear conjugated tricyclic systems have interesting fluorescence or other electrophysical properties. Bis-pyrazolepyridines such as compound 30 have been incorporated into polymers as fluorescent chromophores <1999JMC339>, and used in doped polymer matrices <1997JMC2323>. They are electroluminescent at 425 nm and photoluminescent at 427 and 430 nm in a poly(vinylcarbazole) matrix with a quantum efficiency of 0.8. 

Villegas M.A., Pascual L., Sol-gel coatings doped with a pH sensitive chromophore, Thin Sold Films 1999 351 103-108. 

Waveguide Fabrication Techniques Unique to Chromophore-Doped Polymers... 

The anion optical sensor can also be fabricated with metalloporphyr-ins. For example, polymeric membranes doped with indium porphyrins and a lipophilic dichlorofluorescein derivative were shown to be very selective to chloride and acetate anions. The response mechanism is based on extraction of anions into the bulk organic film by indium porphyrins and a simultaneous coextraction of hydrogen ions. This results in protonation of the pH chromophore, and hence a change in the optical absorbance of the polymeric film. 

Reinen and Grefer (116) have measured the d—d spectra of distorted tetrahedral Cu04 chromophores in mixed oxides. This work concerns copper-doped lattices such... 

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