Effect of Organic Salt Doping on The Performance of Poly(9,9-di-n-hexylfluorenyl-2,7-diyl) Organic Light Emitting Diode, OLED.

Single layer OLED devices made of poly(9,9-di-n-hexylfluorenyl-2,7-diyl) (PHF) as electroluminescent layer were fabricated. The effect of organic salt, tetrabutylammonium hexafluorophosphate (TBAPF₆) doping on these devices were studied. The original device with structure of ITO/PHF/Al has the brightness of 0.16 cd/m² and turn-on voltage of 23 V. After doping process, the device with the structure of ITO/PHF:TBAPF₆/Al has the brightness of 0.63 cd/m² and the turn on voltage of 15 V. The doping process of the luminescent material with organic salt not only enhanced the performance of the OLED devices in terms of turn-on voltage and the brightness, but also changed the color of light emission where the doped device has emitted broader visible spectrum. [ABSTRACT FROM AUTHOR]