Carrier Injection Characteristics of Organic Electroluminescent Devices

Egusa, Syun; Miura, Akira; Gemma, Nobuhiro; Azuma, Makoto

doi:10.1143/jjap.33.2741

Cited by 70 publications

(33 citation statements)

References 14 publications

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“…43,44 It is noteworthy that the position of the hole injection voltage can also be obtained by a slow "reverse" CELIV or DCM (displacement current measurement), where a positive voltage ramp is applied to the device. 45 As shown in Fig. S1 of the supplementary material the capacitive current response follows the same curve as the capacitance-voltage plot.…”

Section: Resultsmentioning

confidence: 78%

The use of charge extraction by linearly increasing voltage in polar organic light-emitting diodes

Züfle

Altazin

Hofmann

et al. 2017

Journal of Applied Physics

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We demonstrate the application of the CELIV (charge carrier extraction by linearly increasing voltage) technique to bilayer organic light-emitting devices (OLEDs) in order to selectively determine the hole mobility in N,N0-bis(1-naphthyl)-N,N0-diphenyl-1,10-biphenyl-4,40-diamine (α-NPD). In the CELIV technique, mobile charges in the active layer are extracted by applying a negative voltage ramp, leading to a peak superimposed to the measured displacement current whose temporal position is related to the charge carrier mobility. In fully operating devices, however, bipolar carrier transport and recombination complicate the analysis of CELIV transients as well as the assignment of the extracted mobility value to one charge carrier species. This has motivated a new approach of fabricating dedicated metal-insulator-semiconductor (MIS) devices, where the extraction current contains signatures of only one charge carrier type. In this work, we show that the MIS-CELIV concept can be employed in bilayer polar OLEDs as well, which are easy to fabricate using most common electron transport layers (ETLs), like Tris-(8-hydroxyquinoline)aluminum (Alq3). Due to the macroscopic polarization of the ETL, holes are already injected into the hole transport layer below the built-in voltage and accumulate at the internal interface with the ETL. This way, by a standard CELIV experiment only holes will be extracted, allowing us to determine their mobility. The approach can be established as a powerful way of selectively measuring charge mobilities in new materials in a standard device configuration.

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Section: Resultsmentioning

confidence: 78%

The use of charge extraction by linearly increasing voltage in polar organic light-emitting diodes

Züfle

Altazin

Hofmann

et al. 2017

Journal of Applied Physics

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“…The experimental setup for DCM is shown in Figure 1. DCM enables us to characterize the behavior of carriers and trapped charges in organic electronic devices [6,7,8,9,10]. The current measured in DCM (I DCM ) can be described as the sum of the actual current I ACT and the displacement current αC eff as follows;…”

Section: Experiments and Methodsmentioning

confidence: 99%

Performance of Alq3-based Organic Light-Emitting Diode Fabricated under Light Irradiation

Kim¹,

Tamura²,

Nakayama³

et al. 2012

J. Photopol. Sci. Technol.

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“…In the present experiment, we focus on the carrier transport property of the organic layer, and do not mention the comparison of the emission ratio, because the carrier injection property of organic junction, besides the carrier transport property, is also an important process in the organic EL device [33]. Thus, we are now studying the EL property using various kinds of single-and double-layered [tM(pc)] thin films as a hole transfer layer.…”

Section: Electroluminescent Device Using [Cu(pc)]-[zn(pc)] Double-laymentioning

confidence: 99%

Construction of a ‘Sequential Potential Field’ by [Cu(pc)]/[Zn(pc)] double-layered Thin Film: Application to Electrochromic and Electroluminescent Devices

Tominaga

Hayashi

Toshima

1997

J. Porphyrins Phthalocyanines

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‘Sequential potential field’ is a concept to produce a potential cascade by the organization of redox components, and to aim for an effective and vectorial electron and/or hole transfer. Construction of the sequential potential field is examined by double-layered thin film composed of two kinds of metallophthalocyanine having different oxidation potentials, i.e. copper phthalocyanine and zinc phthalocyanine. In the electrochromic device of double-layered metallophthalocyanine thin films, hole transfer can be controlled by the order of deposition, which suggests that the present system is suitable for the construction of a sequential potential field. Double-layered metallophthalocyanine thin films were also used as a hole transfer layer in all-solid organic electroluminescent devices. In the case of an indium-tin oxide/copper phthalocyanine/zinc phthalocyanine/tris(8-hydroxyquinoline)aluminum/ Mg - Ag device for electroluminescence, a high brightness of more than 4000 cd m−2 can be achieved. This double-layered hole transfer system is more effective than the corresponding single hole transfer system, which is due to the construction of a sequential potential field in the hole transfer layer.

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Carrier Injection Characteristics of Organic Electroluminescent Devices

Cited by 70 publications

References 14 publications

The use of charge extraction by linearly increasing voltage in polar organic light-emitting diodes

The use of charge extraction by linearly increasing voltage in polar organic light-emitting diodes

Performance of Alq3-based Organic Light-Emitting Diode Fabricated under Light Irradiation

Construction of a ‘Sequential Potential Field’ by [Cu(pc)]/[Zn(pc)] double-layered Thin Film: Application to Electrochromic and Electroluminescent Devices

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