Organic light-emitting diodes hole transport materials

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Low molecular weight and polymeric heterocyclics as electron transport/hole-blocking materials in organic light-emitting diodes... 

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S. Tokito, K. Noda, K. Shimada, S. Inoue, M. Kimura, Y. Sawaki, and Y. Taga, Influence of hole transporting material on device performance in organic light-emitting diode, Thin Solid... 

Several articles have addressed the possibility of using dendritic molecules as electroluminescent materials in organic light-emitting diodes (LEDs) [140-148]. For example, compound 70 works as an excellent hole transport material, and has been incorporated into multilayer devices that exhibit high luminance efficiency and significant thermal stability [140, 141, 144],... 

Fig. 10 Structure of an organic light-emitting diode. HIL hole injection layer (e.g., Cu-Phthalocyanine), HTL hole transport layer, EML emission layer, ETL electron transport layer, EIL electron injection layer (e.g., LiF). The light generated by the recombination of holes and electrons is coupled out via the transparent anode (e.g., indium-tin-oxide ITO). Typical cathode materials are Mg Ag, Ca/Ag, Al...

Katsuma and Shirota have synthesized several dendrimers that contain multiple phenylamine moieties and investigated their potential use as components of organic light-emitting diode (LEDs). They found that these materials were well suited for use in the hole-transport layer of multilayer LEDs, exhibiting comparable performance to previously utilized materials [lOlj. 

Another interesting application is to use phthalocyanines as a hole-injection layer in organic light-emitting diodes (OLEDs). Zhu et al. demonstrated that a SAM of phthalocyanine thiol (HS-Pc) may act as a hole injection material in OLEDs (Fig. 42). The insertion of a SAM of HS-Pc between the Au anode and the hole-transport layers enhances the hole injection, which in-... 

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