Transient response of a bilayer organic electroluminescent diode: Experimental and theoretical study of electroluminescence onset

Hassine, L.; Bouchriha, H.; Roussel, Joseph; Fave, Jean‐Louis

doi:10.1063/1.1350419

Cited by 38 publications

(24 citation statements)

References 11 publications

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“…͑7͔͒, one of the reasons for the quantitative mismatch is probably the difference in charge injection behavior between dynamic excitation at very low duty by a single fast electric pulse and continuous dc excitation involving high-duty pulsed excitation, for example, the dynamic building up of space charges in organic layers, the orientational polarization of molecules, and so on. 11,19,20 This is because the measured specific capacitance is close to the capacitance per unit area of the condenser with a relative permittivity of 3 ͑representative value of most organic solids͒ and insulator thickness of 110 nm.…”

Section: Analysis Of Experimental Resultsmentioning

confidence: 97%

Dynamic turn-on behavior of organic light-emitting devices with different work function cathode metals under fast pulse excitation

Ichikawa

Amagai

Horiba

et al. 2003

Journal of Applied Physics

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We investigate the electroluminescence ͑EL͒ response of organic light-emitting diodes ͑OLEDs͒ with different metal cathodes and device-area dependence. Moreover, we formulate the EL delay time, which is an indicator of the EL response. The EL response is fundamentally governed by the device area, i.e., the capacitance of the device, and this for the OLEDs with low work function metals as a cathode is fast. According to the formulation, we estimate electron mobility in an organic bilayer and the threshold electric fields for electron injection under fast-pulse excitation. It is consequently demonstrated that electron mobility in the bilayer showed mixed mobility characteristics for each layer, and the threshold electric field became smaller with a decrease in the work function of cathode metals. The low work function metal cathode device is identified as a high-speed EL response device.

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Section: Analysis Of Experimental Resultsmentioning

confidence: 97%

Dynamic turn-on behavior of organic light-emitting devices with different work function cathode metals under fast pulse excitation

Ichikawa

Amagai

Horiba

et al. 2003

Journal of Applied Physics

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“…The model had been applied successfully for the modeling of current flow in LED devices. [24][25][26][27] We have adopted this approach to model our device.…”

Section: Resultsmentioning

confidence: 99%

Efficient Exciton Quenching by Hole Polarons in the Conjugated Polymer MEH‐PPV

Song

McNeill

et al. 2004

Israel Journal of Chemistry

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Recently published near field scanning optical measurements (NSOM) on the conjugated polymer MEH-PPV exhibited a strong dependence of the photoluminescence intensity on the applied electric fields at the NSOM tip. The observed effect is apparently due to exciton quenching by hole polarons. In the present paper, a model "single carrier" electro-modulated-photoluminescence device is used to further explore the exciton quenching effect of hole polarons in MEH-PPV. Hole polarons, created by charge injection from an ITO electrode, are observed to dramatically quench the photoluminescence intensity of MEH-PPV. The Stern-Volmer quenching efficiency of a hole polaron in conjugated polymer thin films was measured to be 390 nm 3 . This value, and other data presented herein, are consistent with the published NSOM photoluminescence modulation measurements and offer further evidence that hole polarons are efficient photoluminescence quenchers in MEH-PPV.

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“…Fig. 2) [12,13]: A pulse generator 8114A from Hewlett Packard, terminated with a 50 Ω load resistance, is connected with the OLED and a 50 Ω resistance in series. The voltage drop 1 V arcoss the latter gives information about the current within the ciruit while 2 1 V V -is a measure for the voltage applied to the OLED.…”

Section: Time-resolved Electroluminescence Set-upmentioning

confidence: 99%

Measuring carrier mobility in conventional multilayer organic light emitting devices by delayed exciton generation

Reineke¹,

Lindner²,

Huang³

et al. 2008

Physica Status Solidi (b)

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The authors present an alternative method for the determination of the charge carrier mobility of organic thin films. In contrast to known methods like space charge limited current, field effect transistor and time of flight approaches, we determine the charge carrier mobility of a mixed film, serving as emission layer, within the conventional multilayer device architecture. We make use of a strong delayed generation feature in the electroluminescent decay, following a short voltage pump pulse in a time‐resolved set‐up. Taking into account the preferentially electron transporting properties of the film, the mobility of a N,N ′‐di(naphthalen‐2‐yl)‐N,N ′‐diphenyl‐benzidine (NPB):tris(1‐phenylisoquinoline) iridium [Ir(piq)3] mixed film is found to be on the order of 10–5 cm2 (Vs)–1. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Transient response of a bilayer organic electroluminescent diode: Experimental and theoretical study of electroluminescence onset

Cited by 38 publications

References 11 publications

Dynamic turn-on behavior of organic light-emitting devices with different work function cathode metals under fast pulse excitation

Dynamic turn-on behavior of organic light-emitting devices with different work function cathode metals under fast pulse excitation

Efficient Exciton Quenching by Hole Polarons in the Conjugated Polymer MEH‐PPV

Measuring carrier mobility in conventional multilayer organic light emitting devices by delayed exciton generation

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