Degradation mechanisms in organic light emitting diodes

Shen, Jun; Wang, D; Langlois, Eric; Barrow, William A.; Green, P.J; Tang, Ching Wan; Shi, Jianmin

doi:10.1016/s0379-6779(99)00370-7

Cited by 72 publications

(51 citation statements)

References 4 publications

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“…306,307 These results suggest that there is more than one mechanism involved in the degradation of the investigated devices. The ion mobility model itself cannot explain the incomplete recovery of the OLED performance, especially the behavior of the luminance.…”

Section: Influence Of the Driving Scheme On A Lifetime Experimentsmentioning

confidence: 78%

“…20 Additional to the intrinsic impurities of the organics, it is assumed that other materials such as dopants, metals from the electrodes, and possible dissociation products of organic materials will lead to an initial voltage rise accompanied by an efficiency drop. 297,303,306,307 Such a voltage rise is partially reversible, according to the "mobile ion impurity model". …”

Section: Impurity-induced Degradationmentioning

confidence: 99%

“…306,307,309 Usually, voltage rise is attributed to an increased injection barrier at some interface and/or a decrease in conductivity of some transport layer, for example, because of accumulation of traps. 23 Multiple interfaces and transport layers may contribute to this effect.…”

Section: Voltage Increasementioning

confidence: 99%

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Degradation Mechanisms and Reactions in Organic Light-Emitting Devices

et al. 2015

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Section: Influence Of the Driving Scheme On A Lifetime Experimentsmentioning

confidence: 78%

Section: Impurity-induced Degradationmentioning

confidence: 99%

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Degradation Mechanisms and Reactions in Organic Light-Emitting Devices

et al. 2015

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“…1(b tends to decrease with operating time. 12 They suggested that mobile ions can be the cause of the observed voltage changes. Our experiment showed direct observations of ions diffused from electrodes into organic layers after applying a d.c. voltage.…”

Section: Resultsmentioning

confidence: 99%

Study on the interaction between Ag and tris(8‐hydroxyquinoline) aluminum using x‐ray photoelectron spectroscopy

Song

Moulder

et al. 2001

Surface & Interface Analysis

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In the present study, model organic light-emitting diodes (OLEDs) with a structure of Ag/tris(8-hydroxyquinoline) aluminum (Alq 3 )/indium tin oxide (ITO) were fabricated using vacuum evaporation and analyzed using an x-ray photoelectron spectroscopy (XPS) depth profile technique. Diffusion of Ag into the Alq 3 layer was clearly observed. Applying a positive electron field enhanced the diffusion. Compared with pure Ag, the binding energy of diffused Ag 3d 5/2 at the interface increased slightly, and the contribution of Ag to the valence-band spectra also was changed across the depth, implying a weak interaction between diffused Ag and the hydroxyquinoline ligands.

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“…Several models are proposed to explain the mechanisms that cause polarization field. The first one is the trapping model [43] in which traps can be present and/or created in the organic layers. The second model is based on the permanent dipoles: the external field induces the reorientation of the permanent dipoles and can lead to the increase and/or decrease of internal field in the device [14,33].…”

Section: Fast Decaymentioning

confidence: 99%

Application of [Pt(II)(Tetra-Tert-Butylsalophen)] Complex within Organic Devices: Deep Red Emission, Bistable Light-Emitting Diodes and Operational Stability

et al. 2018

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This paper focuses on the Negative Differential Resistance (NDR) we observed on organic light-emitting diodes (OLEDs) using [Pt(II)(tetra-tert-butylSalophen)] as host, since this Pt(II) complex displays a deep-red emission (λ max = 660 nm). Electrical characterizations of monolayer devices have shown that doping Tris-(8-hydroxyquinoline)aluminum (Alq 3 ) as matrix emissive layer with this complex, leads to the modulation of the charge transport properties highlighted by Negative Differential Resistance (NDR). Upon electrical driving stresses, the conductivity of active layer can be switched between two electrical states (ON and OFF) with a figure of merit higher than 10 3 . By adding an electron-blocking layer, we demonstrated that the NDR trend is closely related to negative charge accumulation within Alq 3 leading to the modification of electronic properties in the vicinity of anode/active layer interface. The NDR phenomenon is interpreted in terms of space charge polarization (SCP) linked to charge trapping/untrapping mechanism as a consequence of the polarization/depolarization of the Pt(II) complex. Under electrical driving stresses, the performance of the devices which include the Pt(II) complex, are stabilized. A schematic model is proposed to depict the SCP responsible for NDR and decrease-resetting behaviors observed in these devices.

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Degradation mechanisms in organic light emitting diodes

Cited by 72 publications

References 4 publications

Degradation Mechanisms and Reactions in Organic Light-Emitting Devices

Degradation Mechanisms and Reactions in Organic Light-Emitting Devices

Study on the interaction between Ag and tris(8‐hydroxyquinoline) aluminum using x‐ray photoelectron spectroscopy

Application of [Pt(II)(Tetra-Tert-Butylsalophen)] Complex within Organic Devices: Deep Red Emission, Bistable Light-Emitting Diodes and Operational Stability

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