Arylamines mobilities

Despite the success of the disorder model concerning the interpretation of data on the temperature and field dependence of the mobility, one has to recognize that the temperature regime available for data analysis is quite restricted. Therefore it is often difficult to decide if a In p vs or rather a In p vs representation is more appropriate. This ambiguity is an inherent conceptual problem because in organic semiconductors there is, inevitably, a superposition of disorder and polaron effects whose mutual contributions depend on the kind of material. A few representative studies may suffice to illustrate the intricacies involved when analyzing experimental results. They deal with polyfluorene copolymers, arylamine-containing polyfluorene copolymers, and c-bonded polysilanes. 

Khan RUA, Poplavskyy D, Kreouzis T, Bradley DDC (2007) Hole mobility within arylamine-containing polyfluorene copolymers a time-of-flight transient-photocurrent study. Phys Rev B 75 035215... 

Among arylamine semiconductors, indolo[3,2-ib]carbazole (5) is an appealing system for studies because it has a relatively large and planar molecular structure to enable facile establishment of higher structural order for charge transport [57, 58]. Earlier, we reported the use of 5,ll-bis(l-naphthyl)indolo[3,2-jb]carbazole, a derivative of 5, as a hole transport material in OLEDs [59]. Because of its sterically encumbered naphthyl substituents, this compound forms only an amorphous film on vacuum deposition, and mobility is low in OTFTs, as expected. 

Hole transport in polymers occurs by charge transfer between adjacent donor functionalities. The functionalities can be associated with a dopant molecule, pendant groups of a polymer, or the polymer main chain. Most literature references are of doped polymers. The more common donor molecules include various arylalkane, arylamine, enamine, hydrazone, oxadiazole, oxazole, and pyrazoline derivatives. Commonly used polymers are polycarbonates, polyesters, and poly(styrene)s. Transport processes in these materials are unipolar. The mobilities are very low, strongly field and temperature dependent, as well as dependent on the dopant molecule, dopant concentration, and the polymer host This chapter reviews hole transport in polymers and doped polymers of potential relevance to xerography. The organization is by chemical classification. The discussion mainly includes molecularly doped, pendant, and... 

The behavior of thioatnides (70, Table 8) is influenced by tautomeric effects. In the case of bis-aminomcthylation of 2-imidazolidinothionc, - for extunplc, the mobile H atom can be selectively substituted in both the forms by reaction with secondary di-alkylamincs, or primary arylamines, to give, respectively, N,N- (A attack) or N,S- (B attack) bis-Mannich bases. 

The electrochemical properties of 1 allow it to give rise to electrochemiluminescence [69]. When a solution of 1 is treated with coreactants, such as benzoyl peroxide or arylamine, an intense blue light is generated. In addition, simple corannulene derivative l,2-bis(trifluoromethyl)corannulene (23c) can potentially be applied as a electrically conductive material. The electron-accepting ability of trifluoromethyl groups cause 23c to have charge-carrier mobility displays as >0.9 cm V s [41]. 

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