Organic light-emitting diodes based on multilayer structures

Tománek, David; Veriot, G.; Antony, Rémi; Moliton, André

doi:10.1016/s0379-6779(01)00420-9

Cited by 20 publications

(5 citation statements)

References 2 publications

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“…A second generation of devices was prepared including a conducting polymer interlayer (PEDOT-PSS) between the ITO anode and the TPD hole-transport material. This approach has been shown to improve device performance by reducing the barrier to hole injection at the anode, , resulting in increased device lifetime and efficiency. Devices containing this additional layer for hole injection both passed more current and produced more light at a given voltage, as shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Low Work Function Reduced Metal Complexes as Cathodes in Organic Electroluminescent Devices

et al. 2003

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Several electrochemically active polypyridine-metal complexes are isolated in the formally zero-charged state via reductive electrocrystallization, and are thermally evaporated to form conducting thin films with low work functions. Solution-phase cyclic voltammetry of the parent complexes is used to predict the work function of these materials. The reduced films are used as cathode materials in organic light-emitting devices, in place of the commonly used low work function metals such as calcium and aluminum. These reduced complexes represent a new class of materials available for use as electron-injecting contacts in organic electroluminescent devices.

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Section: Resultsmentioning

confidence: 99%

Low Work Function Reduced Metal Complexes as Cathodes in Organic Electroluminescent Devices

et al. 2003

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“…To understand the difference between the two titled calculations, we have taken two example sets of OLEDs emitting either green or blue light. 14,15 The green OLEDs were obtained with an Alq 3 emissive layer, and the L͑V͒ characteristics of optimized structures ͑which included HILs or/and HTLs͒ are reported in Fig. 5͑a͒.…”

Section: A Comparison Between Calculations Based On the Monochromatic...mentioning

confidence: 99%

Optical characterization of polychromatic organic light emitting diodes

Tománek¹,

Moliton²,

Ratier³

et al. 2005

Journal of Applied Physics

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International audienceLuminance and quantum yields of organic light emitting diodes (OLEDs) are generally calculated by using a hypothetic monochromatic emission even though the actual external emission is lower than the internal emission because of internal reflection, and is polychromatic. For organic materials, we present the effects of the total internal reflection on quantum yields. Calculations for the luminance and the efficiency of an ideal pseudomonochromatic source are compared with those for a real polychromatic source. While we demonstrate that the calculation of the yield is practically unchanged whatever hypothesis is used, we do show, however, that by assuming that the source is pseudomonochromatic, the luminances of green and blue OLEDs are overvalued or undervalued by a factor of 4, respectively

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“…2 Furthermore, some researchers attempted to enhance the efficiency of OLEDs by optimizing their physical structure. Device performance can be improved by utilizing multilayer heterostructures to confine both charge carriers and excitations 3,4 or inhibit impurity from electrode diffusion into organic layer, 5 as well as developing a small-size device to avoid the temperature-induced breakdown. 6,7 In addition to the studies in the materials and physical configuration of OLEDs, the change in voltage driving scheme on OLEDs has been considered to be an alternative approach to realizing high performance.…”

Section: Introductionmentioning

confidence: 99%

High peak luminance of molecularly dye-doped organic light-emitting diodes under intense voltage pulses

Wei

Ichikawa

Furukawa

et al. 2005

Journal of Applied Physics

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The performance and efficiency of molecularly doped organic light-emitting devices (OLEDs) using voltage pulses have been investigated. The maximum current density and peak luminance have been found to depend on the pulse duration and device size, which was attributed to the heat effect in device. The self-quenching of dye molecules, especially at a high current density of ∼A∕cm2, can be effectively inhibited using a low concentration of acceptor in donor system as a light-emitting layer (EML). For an OLED using a 0.4-mol% rubrene in Alq3 as an EML, a maximum peak luminance of 5.66×106cd∕m2 at 52.8V can be sustained under the voltage pulses of duration of 5μs. The current efficiency has been observed to decrease rapidly with the current density in device, which was believed to result from the annihilation of excitons. We have also investigated the performance of a pulsed OLED with an emitter layer of 4.0-mol% 1,4-bis[2-[4-[N,N-di(p-tolyl)amino]phenyl]vinyl]benzene in 4,4′-bis(9-carbazolyl)biphenyl, which has been known to exhibit low-amplified spontaneous emission under a pulsed nitrogen laser.

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Organic light-emitting diodes based on multilayer structures

Cited by 20 publications

References 2 publications

Low Work Function Reduced Metal Complexes as Cathodes in Organic Electroluminescent Devices

Low Work Function Reduced Metal Complexes as Cathodes in Organic Electroluminescent Devices

Optical characterization of polychromatic organic light emitting diodes

High peak luminance of molecularly dye-doped organic light-emitting diodes under intense voltage pulses

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