Electrical properties of organic light-emitting diodes (OLEDs) studied by impedance spectroscopy in ultra-high vacuum

2001 ◽  
Author(s):  
Rudi Ono ◽  
Michael Kiy ◽  
Ivan Biaggio ◽  
Peter Guenter
Keyword(s):  
Electrical Properties ◽  
Impedance Spectroscopy ◽  
Light Emitting Diodes ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

Temperature Dependent Electrical Properties of Organic Light-Emitting Diodes Using a Zn Complex

2010 ◽  
Vol 10 (5) ◽  
pp. 3304-3307
Author(s):  
Dong-Eun Kim ◽  
Gyu-Chae Choi ◽  
Jun-Woo Park ◽  
Byoung-Sang Kim ◽  
Burm-Jong Lee ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Temperature Dependent ◽  
Light Emitting ◽  
Organic Light

Degradation of Bilayer Organic Light-Emitting Diodes Studied by Impedance Spectroscopy

2016 ◽  
Vol 16 (4) ◽  
pp. 3368-3372 ◽  
Author(s):  
Shuri Sato ◽  
Masashi Takata ◽  
Makoto Takada ◽  
Hiroyoshi Naito
Keyword(s):  
Impedance Spectroscopy ◽  
Light Emitting Diodes ◽  
Device Simulation ◽  
Hole Transport ◽  
Organic Light Emitting Diodes ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Hole Transport Layer ◽  
Light Emitting ◽  
Organic Light

The degradation of bilayer organic light-emitting diodes (OLEDs) with a device structure of N, N′-di(1-naphthyl)-N, N′-diphenylbenzidine (α-NPD) (hole transport layer) and tris-(8-hydroxyquinolate)aluminum (Alq3) (emissive layer and electron transport layer) has been studied by impedance spectroscopy and device simulation. Two modulus peaks are found in the modulus spectra of the OLEDs below the electroluminescence threshold. After aging of the OLEDs, the intensity of electroluminescence is degraded and the modulus peak due to the Alq3 layer is shifted to lower frequency, indicating that the resistance of the Alq3 layer is increased. Device simulation reveals that the increase in the resistance of the Alq3 layer is due to the decrease in the electron mobility in the Alq3 layer.

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