Carbazole based bipolar host materials for organic electroluminescent devices -recent advances

Abdul Bais, Muhammad Zaman Ashraf

Abstract


Organic light-emitting diodes (OLEDs) are emerging technology for flat panel displays and lighting applications because they are highly efficient, ultrathin, lightweight and flexible and exhibit multicolour emission. Phosphorescent organic light-emitting diodes (PhOLEDs) are more important than fluorescent based OLEDs in term of higher internal quantum efficiency. The emissive layer (EML) of OLEDs employed host material to reduce concentration quenching and triplet–triplet annihilation of the dopant. Carbazole based bipolar molecules have attracted much interest as host materials for organic light emitting diode (OLED) because of the advantageous properties of cabazole group to form stable radical cations(holes) along with high charge carrier mobilities. This minireview is a selection from recent advances in the design and synthesis of carbazole based host materials for OLEDs.


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