Electronic traps in OLED transport layers: influence of doping and accelerated aging

Juergen Steiger; Siegfried Karg; Heinz von Seggern

doi:10.1117/12.416902

2 February 2001 Electronic traps in OLED transport layers: influence of doping and accelerated aging

Juergen Steiger, Siegfried Karg, Heinz von Seggern

Proceedings Volume 4105, Organic Light-Emitting Materials and Devices IV; (2001) https://doi.org/10.1117/12.416902
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

The methods of thermally stimulated currents (TSC) and thermally stimulated luminescence (TSL) were employed to reveal the trap structure of the most prominent organic semiconductors materials such as tris-8-(hydroxyquinoline) (Alq₃), N-N'-di(1-naphtyl)-N-N'-diphenylbenzidine ((alpha) -NPD), and 4,4',4'-tris-(N-2-naphtyl)-N-phenylamino- triphenylamine (1-Naph-DATA). The energetic trap depths and a lower limit of the trap densities were derived for all investigated materials by means of the initial-rise method and curve fitting techniques. Typical activation energies range between 0.1 and 0.6 eV and trap concentrations differ between 10¹⁴ and 10¹⁷ cm^-3. Most materials exhibit trap levels with a single activation energy, however, in Alq₃ a brought distribution of trap depths will be reported. In addition, the polarity of the dominant trap levels was determined by a comparison of TSC spectra from optically and electrically filled traps. Besides the trap detection and characterization the effect of doping and accelerated aging on the trap structure will be shown. TSC and TSL results on rubrene doped Alq₃ reveals a characteristic shift in the trap depth indicating new rubrene related trapping site. The effect of aging on the trap structure of organic semiconductors in 'potentially harmful' atmospheres such as oxygen and humidity and their correlation to I-V characteristics will also be reported.

Citation Download Citation

Juergen Steiger, Siegfried Karg, and Heinz von Seggern "Electronic traps in OLED transport layers: influence of doping and accelerated aging", Proc. SPIE 4105, Organic Light-Emitting Materials and Devices IV, (2 February 2001); https://doi.org/10.1117/12.416902

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