Oxidiazole derivatives

Pig. 8. Stmctures of (a) hole transporter molecule W,Ar-biphenyl-W,Ar-bis(3-methylphen5l)l-lTiphen5l-4,4 diamine (TPD) (b) an oxidiazole derivative ... 

An example "double heterostructure" OLED shown in Figure 7c uses an ITO coated glass substrate, upon which a hole transporting layer, typically composed of a tertiary amine (eg, IV,IV-biphenyl-A IV7-bis(3-methylphenyl)l-l biphenyl-4,4 diamine, abbreviated TPD), a thin film of an emissive material such as aluminum-8-hydroxyquinoline(Alq3) and an electron-transporting layer (often an oxidiazole derivative) are sequentially deposited in vacuum (Fig. 

Most common electron transporters are derived from heterocyclic aromatic compounds, either as pure organic materials or as metal coordination complexes. Pure organic molecules such as phenanthrolines, oxidiazoles, and triazoles can have high electron mobilities (Figure 25). Some of the highest carrier mobilities for amorphous molecular materials have been reported for oligofluorenes (lO -lO cm V j-i) 305,313 inefficient carrier... 

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