Conjugated polymer composites for use in electrophosphorescent light-emitting diodes

Xiong Gong; Wanli Ma; Jacek C. Ostrowski; Guillermo C. Bazan; Daniel Moses; Alan J. Heeger

doi:10.1117/12.515221

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16 February 2004 Conjugated polymer composites for use in electrophosphorescent light-emitting diodes

Xiong Gong, Wanli Ma, Jacek C. Ostrowski, Guillermo C. Bazan, Daniel Moses, Alan J. Heeger

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Proceedings Volume 5214, Organic Light-Emitting Materials and Devices VII; (2004) https://doi.org/10.1117/12.515221
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

High performance electrophosphorescent light emitting diodes (LEDs) were demonstrated by using conjugated polymers, poly(9,9-dioctylfluorenyl-2,7-diyl) (PFO), PFO end-capped with hole-transporting moieties (HTM), PFO-HTM, and PFO end-capped with electron-transporting moieties (ETM), PFO-ETM, as the hosts and the organometallic emitter, tris-[2,5-bis-2'-(9,9'-dihexylfluorene) iridium] [Ir(HFP)₃] as the guest. Electrophosphorescent LEDs fabricated from PFO, PFO-HTM, and PFO-ETM as the hosts emit red light with turn-on voltage around 5V, luminances (L) of 2040 cd/m², 1937 cd/m² and 2487 cd/m² at 290 mA/cm² (16 V), and luminance efficiencies (LE) of 1.40 cd/A, 1.38 cd/A and 1.80 cd/A at 4.5 mA/cm² for PFO, PFO-HTM, and PFO-ETM, respectively. The results demonstrate that high performance electrophosphorescence can be obtained from conjugated polymer-based LEDs that are fabricated by processing the active materials directly from solution.

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Xiong Gong, Wanli Ma, Jacek C. Ostrowski, Guillermo C. Bazan, Daniel Moses, and Alan J. Heeger "Conjugated polymer composites for use in electrophosphorescent light-emitting diodes", Proc. SPIE 5214, Organic Light-Emitting Materials and Devices VII, (16 February 2004); https://doi.org/10.1117/12.515221

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