Time-Resolved Observation of Organic Light Emitting Diode under Reverse Bias Voltage by Extended Time Domain Reflectometry

Weisong LIAO; Akira KAINO; Tomoaki MASHIKO; Sou KUROMASA; Masatoshi SAKAI; Kazuhiro KUDO

doi:10.1587/transele.2022OMS0011

Special Section on Recent Progress in Organic Molecular Electronics

Time-Resolved Observation of Organic Light Emitting Diode under Reverse Bias Voltage by Extended Time Domain Reflectometry

Weisong LIAO, Akira KAINO, Tomoaki MASHIKO, Sou KUROMASA, Masatoshi SAKAI, Kazuhiro KUDO

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Keywords: time resolved measurement, transient impedance, OLED, carrier dynamics, extended time domain reflectometry

JOURNAL RESTRICTED ACCESS

2023 Volume E106.C Issue 6 Pages 236-239

DOI https://doi.org/10.1587/transele.2022OMS0011

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Abstract

We observed dynamical carrier motion in an OLED device under an external reverse bias application using ExTDR measurement. The rectangular wave pulses were used in our ExTDR to observe the transient impedance of the OLED sample. The falling edge of the transmission waveform reflects the transient impedance after applying pulse voltage during the pulse width. The observed pulse width variation at the falling edge waveform indicates that the frontline of the hole distribution in the hole transport layer was forced to move backward to the ITO electrode.

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