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Frontiers of Optoelectronics

ISSN 2095-2759

ISSN 2095-2767(Online)

CN 10-1029/TN

Postal Subscription Code 80-976

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Front Optoelec    2012, Vol. 5 Issue (3) : 279-283    https://doi.org/10.1007/s12200-012-0265-y
RESEARCH ARTICLE
Transient and stable electroluminescence properties of alternating-current biased organic light-emitting diodes
Jinzhao HUANG(), Minghui SHAO, Xijin XU()
School of Physics and Technology, University of Jinan, Jinan 250022, China
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Abstract

In this work, transient electroluminescence (EL) (brightness-voltage waveform curve) was utilized to investigate the working mechanism of alternating-current biased organic light-emitting diodes (AC-OLEDs). In lower frequency domain, injection potential barrier was the dominant effect to determine the luminescence intensity; with increased frequency, the influence of capacitance effect becomes dominant, which can be confirmed according to the investigations on stable EL of the AC-OLEDs. The results indicate that transient and stable EL can agree with each other perfectly. Besides, the stable EL reveals that the thinner device can take more effective capacitance effect.`
Keywords organic light-emitting diodes (OLEDs)      alternating-current (AC)      transient electroluminescence (EL)     
Corresponding Author(s): HUANG Jinzhao,Email:jzhuangjz@yahoo.cn; XU Xijin,Email:sps_xuxj@yahoo.edu.cn, xu.xijin@yahoo.com   
Issue Date: 05 September 2012
 Cite this article:   
Jinzhao HUANG,Minghui SHAO,Xijin XU. Transient and stable electroluminescence properties of alternating-current biased organic light-emitting diodes[J]. Front Optoelec, 2012, 5(3): 279-283.
 URL:  
https://academic.hep.com.cn/foe/EN/10.1007/s12200-012-0265-y
https://academic.hep.com.cn/foe/EN/Y2012/V5/I3/279
Fig.1  (a) Schematic diagram of OLED; (b) energy level diagram of devices; (c) chemical structure of Alq
Fig.2  Brightness-voltage waveform curves under AC voltage at different frequencies: (a) 500 Hz; (b) 1000 Hz; (c) 5000 Hz; (d) 100000 Hz; (e) 200000 Hz
Fig.3  Equivalent circuit of OLED
Fig.4  (a) Stable EL spectrum of device A; (b) frequency response of stable EL intensity of device A
Fig.5  (a) Stable EL spectrum of device B; (b) frequency response of stable EL intensity of device B
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