Title :
Near-Infrared Organic Light-Emitting Diodes Based on Donor-pi-Acceptor Oligomers
Author :
Sharbati, Mohammad Taghi ; Panahi, Farhad ; Gharavi, Alireza
Author_Institution :
Electr. & Electron. Eng. Dept., Shiraz Univ. of Technol., Shiraz, Iran
Abstract :
This letter reports efficient near-infrared (NIR) electroluminescence (EL) of organic light-emitting diodes (OLEDs) based on two donor-pi-acceptor oligomers. The energy gap can be tuned by changing the conjugated length, strengths of the acceptor component, and nonplanarity. EL with peak emission wavelengths of 775 and 905 nm were observed from the two NIR oligomers. External quantum efficiencies up to 3.54%, electrical-to-optical power efficiencies up to 15.8 mW/W, and turn-on voltage of 4.5 V were achieved in OLEDs based on these NIR emitters.
Keywords :
electroluminescence; energy gap; impurity states; organic compounds; organic light emitting diodes; OLED; acceptor component; conjugated length; donor-pi-acceptor oligomers; electrical-to-optical power efficiency; energy gap; near infrared organic light emitting diodes; near-infrared electroluminescence; nonplanarity; quantum efficiency; Absorption; Compounds; Electroluminescence; Ions; Materials; Organic light emitting diodes; Photoluminescence; Electroluminescence (EL); near-infrared (NIR); organic light-emitting diode (OLED);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2081358
