Poly based devices, performance

A.P. Kulkarni and S.A. Jenekhe, Blue light-emitting diodes with good spectral stability based on blends of poly(9,9-dioctyfluorene) interplay between morphology, photophysics, and device performance, Macromolecules, 36 5285-5296, 2003. 

Abstract Poly(dibenzosilole)s are an emerging class of polymers with similar optoelectronic properties to polyfluorenes. With increased stability towards oxidation, several poly(dibenzosilole)-based devices, such as light emitting diodes, have shown improved performance over their polyfluorene counterparts. As a consequence of reduced conjugation in the polymer chain, some poly(dibenzosilole)s have high triplet excited state energies, which make them suitable hosts for blue triplet emitters in electrophosphores-cent devices. 

Poly(dibenzosilole)s are a relatively new class of compounds for the area of organic electronic materials. Poly(dibenzosilole)s are not easily oxidised and have advantages of solubility and processibility over other polyfluorene analogues, such as carbazoles, dibenzophosphole oxides and dibenzothiophene dioxides. Several groups have already incorporated poly(dibenzosilole)s in the latest organic electronic devices such as OLEDs, OFETs and OSCs and have found improved performance over similar polyfluorene-based devices. With continual advancement in their synthesis, dibenzosilole-based polymers are set to match the popularity of polyfluorenes in organic electronic materials. 

Relatively little work has been published on Type II supercapacitors. Arbizzani et al. [147] have prepared PPy/poly(3-methylthiophene) devices performance was similar to their PPy-based Type I device and to carbon supercapacitors. Clemente et al. [163] prepared PPy/PANI devices with specific capacitance values as high as 25 F/g, depending on electrolyte composition. Stenger-Smith et al. [37] prepared poly(3,4-ethylenedioxythiophene) (PEDOT, Figure 9.4J)/poly(3,4-propylenedioxythiophene) (PProDOT, Figure 9.4L) Type II supercapacitors. Switching speed and cycle life were found to depend heavily on electrolyte composition, with only 2% loss in capacity over 50,000 full cycles when 1-ethyl-3- methyl-IH-imidazolium bis(trifluoromethanesulfonyl)imide (EMI-BTI) was used as the electrolyte. 

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