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Displacement‐current analysis of organic light‐emitting diodes
Author(s) -
Lee Soonseok,
Hur Jeongwook,
Lim Sungkyoo
Publication year - 2010
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/jsid18.1.103
Subject(s) - displacement current , oled , materials science , voltage , diode , optoelectronics , displacement (psychology) , current (fluid) , space charge , charge carrier , thermal conduction , optics , electrical engineering , physics , electron , composite material , thermodynamics , psychology , layer (electronics) , quantum mechanics , psychotherapist , engineering
— Organic light‐emitting diodes (OLEDs) having multiple organic layers were fabricated to analyze the physical phenomena occurring in an OLED according to the amplitude of the applied voltage. The staircase voltage with both an increasing period and a constant period was designed and applied to an OLED. The displacement current began to change at a voltage where the conduction current began to change, and partly originated from the formation of space charge due to the low mobility of the majority carrier. The displacement current was shown to be constant at low voltage and decreased after showing a maximum value as the applied voltage increased. The exact voltage for the injection of two types of carriers and light emission could be obtained from the variation in the displacement current.