Characteristics of optical response in red organic light-emitting diodes using two dopant system for application to the optical link devices

Kim, Ju-Seung; Kajii, Hirotake; Ohmori, Yutaka

doi:10.1016/j.tsf.2005.07.010

Cited by 33 publications

(12 citation statements)

References 9 publications

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] Besides the evident importance of achieving fast time responses for incorporating OLEDs as light sources for data communication systems, 13 transient EL studies have generated insight into some of the physical parameters controlling the operation of these devices, in particular, device interfacial effects. For instance, some device structures exhibit an EL overshoot when the driving voltage is switched off, which was related to the delayed recombination of stored electrons and holes.…”

Section: Millisecond Radiative Recombination In Poly"phenylene Vinylementioning

confidence: 99%

Millisecond radiative recombination in poly(phenylene vinylene)-based light-emitting diodes from transient electroluminescence

García-Belmonte

Montero

Barea

et al. 2007

Journal of Applied Physics

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Articles you may be interested inPredictive modeling of the current density and radiative recombination in blue polymer-based light-emitting diodes J. Appl. Phys. 109, 064502 (2011); 10.1063/1.3553412Delayed electroluminescence in small-molecule-based organic light-emitting diodes: Evidence for triplet-triplet annihilation and recombination-center-mediated light-generation mechanism J. Appl. Phys. 98, 013510 (2005); 10.1063/1.1937472 Delayed recombination of detrapped space-charge carriers in poly[2-methoxy-5-( 2 ′ -ethyl-hexyloxy)-1,4phenylene vinylene]-based light-emitting diode Determination of traps in poly(p-phenylene vinylene) light emitting diodes by charge-based deep level transient spectroscopyThe current and electroluminescence transient responses of standard poly͑phenylene vinylene͒-based light-emitting devices have been investigated. The electroluminescence time response is longer ͑milliseconds scale͒ than the current switch-off time by more than one order of magnitude, in the case of small area devices ͑Ͻ0.1 cm 2 ͒. For large area devices ͑ϳ6 cm 2 ͒ the electroluminescence decay time decreases from 1.45 ms to ϳ 100 s with increasing bias voltage. The fast current decay limits the electroluminescence decay at higher voltages. Several approaches are discussed to interpret the observed slow decrease of electroluminescence after turning off the bias. One relies upon the Langevin-type bimolecular recombination kinetics which is governed by the minority carriers ͑electrons͒, and another focuses on the slow release of trapped electrons as possible explanations. Additionally, we show that the device current density is mainly determined by the transport of the fastest carriers ͑holes͒.

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Section: Millisecond Radiative Recombination In Poly"phenylene Vinylementioning

confidence: 99%

Millisecond radiative recombination in poly(phenylene vinylene)-based light-emitting diodes from transient electroluminescence

García-Belmonte

Montero

Barea

et al. 2007

Journal of Applied Physics

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“…Since the rubrene is an assist dopant, only the red emission from DCJTI was observed. The device also shows 100 MHz-direct-modulation [36].…”

Section: Fabrication Of Organic Light-emitting Diodes By Vacuum Processmentioning

confidence: 99%

“…Since the hole conductivity of TDAPB is higher than PVCz, emission starts to increase at lower voltage in TDAPD device compared with that in PVCz device. The emission intensity increases on increasing the applied voltage, and reaches 10 000 cd/m 2 at an applied voltage of 9 V. The external quantum efficiency reaches 5.5 cd/A at an injection current density of 50 mA/cm 2 [36][37][38].…”

Section: Fabrication Of Organic Light-emitting Diodes By Solution Promentioning

confidence: 99%

Development of organic light‐emitting diodes for electro‐optical integrated devices

Ohmori

2010

Laser & Photonics Reviews

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Organic light-emitting diodes (OLEDs) are discussed for electro-optical integrated devices that are used for optical signal transmission. Organic optical devices including polymeric optical fibers are used for optical communication applications to realize polymeric electro-optical integrated devices. The OLEDs were fabricated by vacuum process, i.e. the organic molecular beam deposition (OMBD) technique or a solution process on a polymeric or a glass substrate, for comparison. Optical signals faster than 100 MHz have been created by applying pulsed voltage directly to the OLED utilizing rubrene doped in 8-hydoxyquinolinum aluminum (Alq3), as an emissive layer. OLEDs fabricated by solution process utilizing rubrene doped in carrier-transporting materials have also been discussed. OLEDs utilizing polymeric materials by solution process are also fabricated and discussed. Moving-picture signals are transmitted utilizing both vacuum-and solution-processed OLEDs, respectively.Schematic of the proposed polymeric optical integrated devices utilizing organic light-emitting diodes (OLED) and organic photodiodes (OPD) are fabricated on a polymeric waveguide as a substrate. Electrical video or audio signals are converted into optical signals by OLEDs and transmitted through an optical fiber and received by OPDs. The transmission speed will be in the range of several hundred megahertz, and the device will be used in local area networks (LAN) over short distances.

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“…Apart from the importance of regarding leakage currents in complete device modeling [5], practical applications of light-emitting diodes and other types of organic devices should take into account the influence leakage current might have on the overall system performance. For instance, operating currents involved in small-area devices (100-300 lm diameter), like those devised for data communication systems [6], could be masked by leakage currents within a wide voltage range. In other cases, a proper determination of V BI relies on a subtraction of the leakage current contribution.…”

Section: Introductionmentioning

confidence: 99%

Perimeter leakage current in polymer light emitting diodes

García-Belmonte

Montero

Ayyad-Limonge

et al. 2009

Current Applied Physics

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Characteristics of optical response in red organic light-emitting diodes using two dopant system for application to the optical link devices

Cited by 33 publications

References 9 publications

Millisecond radiative recombination in poly(phenylene vinylene)-based light-emitting diodes from transient electroluminescence

Millisecond radiative recombination in poly(phenylene vinylene)-based light-emitting diodes from transient electroluminescence

Development of organic light‐emitting diodes for electro‐optical integrated devices

Perimeter leakage current in polymer light emitting diodes

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