Analysis of alternating current driven electroluminescence in organic light emitting diodes: A comparative study
被引:19
作者:
Zhang, Le
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Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, Fukuoka 8190395, JapanKyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Zhang, Le
[1
,2
]
Nakanotani, Hajime
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机构:
Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, JapanKyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Nakanotani, Hajime
[1
]
Yoshida, Kou
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Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, JapanKyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Yoshida, Kou
[1
]
Adachi, Chihaya
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Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, Fukuoka 8190395, JapanKyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Adachi, Chihaya
[1
,2
]
机构:
[1] Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
[2] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, Fukuoka 8190395, Japan
AC-driven double-insulated OLED;
Space charges;
Phase shift;
EL saturation;
POLYMER ELECTROLUMINESCENCE;
FREQUENCY-RESPONSE;
THIN-FILM;
DEVICES;
FIELD;
AC;
GENERATION;
INJECTION;
D O I:
10.1016/j.orgel.2014.05.009
中图分类号:
T [工业技术];
学科分类号:
08 ;
摘要:
The alternating current (AC) responses of double-injection and double-insulated organic light-emitting diodes (OLEDs) were investigated and compared. To reveal the electroluminescent (EL) processes in these devices, the AC voltage and frequency dependence of the EL intensity and capacitive current were studied in the time domain with a focus on phase difference analysis. It was found that the voltage-dependent transit time and frequencydependent carrier distribution were important for the AC-driven performance of the double-injection OLEDs. In contrast, although the double-insulated OLEDs shared some similarities with the double-injection OLEDs, they had some unique characteristics, which were the absence of resistive current and phase shift of EL profiles. It was revealed that the EL in the double-insulated OLEDs was driven by the displacement current generated by the ionization of the doped layers, which, however, formed space charge regions and undermined the EL emission. The space charge redistributed the electric field across the devices after the initiation of EL, making the EL maintain for a limited time interval. This effect was significant under low frequency and high AC voltage. Comparing the phase difference between both devices, it was indicated that the space charge effect was responsible for the observed EL phase shift and the asymmetric EL profiles at low frequency and high AC voltage in the double-insulated OLEDs. The proposed model was also of help to understand the EL saturation phenomena with AC frequency and voltage in those devices. (C) 2014 Elsevier B. V. All rights reserved.
机构:
Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Kyushu Univ, Dept Appl Chem, Nishi Ku, Fukuoka 8190395, Japan
Fukuoka I3 Ctr Organ Photon & Elect Res I3 OPERA, Nishi Ku, Fukuoka 8190388, JapanKyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Fujimoto, Hiroshi
Miyayama, Takuya
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机构:
ULVAC PHI Inc, Chigasaki, Kanagawa 2538522, JapanKyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Miyayama, Takuya
Sanada, Noriaki
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h-index: 0
机构:
ULVAC PHI Inc, Chigasaki, Kanagawa 2538522, JapanKyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Sanada, Noriaki
Adachi, Chihaya
论文数: 0引用数: 0
h-index: 0
机构:
Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Kyushu Univ, Dept Appl Chem, Nishi Ku, Fukuoka 8190395, Japan
Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, Fukuoka 8190395, Japan
Fukuoka I3 Ctr Organ Photon & Elect Res I3 OPERA, Nishi Ku, Fukuoka 8190388, JapanKyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
机构:
Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Kyushu Univ, Dept Appl Chem, Nishi Ku, Fukuoka 8190395, Japan
Fukuoka I3 Ctr Organ Photon & Elect Res I3 OPERA, Nishi Ku, Fukuoka 8190388, JapanKyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Fujimoto, Hiroshi
Miyayama, Takuya
论文数: 0引用数: 0
h-index: 0
机构:
ULVAC PHI Inc, Chigasaki, Kanagawa 2538522, JapanKyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Miyayama, Takuya
Sanada, Noriaki
论文数: 0引用数: 0
h-index: 0
机构:
ULVAC PHI Inc, Chigasaki, Kanagawa 2538522, JapanKyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Sanada, Noriaki
Adachi, Chihaya
论文数: 0引用数: 0
h-index: 0
机构:
Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan
Kyushu Univ, Dept Appl Chem, Nishi Ku, Fukuoka 8190395, Japan
Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, Fukuoka 8190395, Japan
Fukuoka I3 Ctr Organ Photon & Elect Res I3 OPERA, Nishi Ku, Fukuoka 8190388, JapanKyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan