S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Electrical and Computer Engineering (전기·정보공학부) Others_전기·정보공학부
Photoluminescence and Electroluminescence of Vacuum-Deposited poly(p-phenylene) Thin Film
- Lee, Changhee; Kang, G. W.; Jeon, J. W.; Song, W. J.; Kim, S. Y.; Seoul, C.
- Issue Date
- Synth. Met. 117 (2001) 75
- We have studied the photoluminescence (PL) and electroluminescence (EL) properties of vacuum-deposited poly(p-phenylene) (PPP) thin film. The film shows the blue PL and EL emission at about 450 nm with well-resolved vibronic structures. The current–voltage–light (I–V–L) characteristics are systematically studied in the temperature range between 12 and 300 K in light-emitting devices of ITO/PPP/Al, and the devices with a hole transporting layer of N,N′-diphenyl-N,N′-bis(3-methylphenyl)-[1,1′-biphenyl]-4,4′-diamine (TPD), ITO/TPD/PPP/Al. The I–V dependence appears to follow the power law, I∝Vm+1, characteristics of a space-charge-limited current. The EL quantum efficiency increases with the decreasing temperature in ITO/TPD/PPP/Al. From the time delay between the EL emission and the onset of the bias voltage pulse in ITO/PPP/Al, we estimated the hole mobility of 4×10−6 cm2/V s in the vacuum-deposited PPP film.
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