Enhanced thermal stability in organic light-emitting diodes through nanocomposite buffer layers at the anode/organic interface

Grozea, D.; Turak, Ayse; Yuan, Yanyan; Han, S.; Lu, Zheng‐Hong; Kim, W. Y.

doi:10.1063/1.2434943

Cited by 33 publications

(26 citation statements)

References 42 publications

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“…The interface between organic semiconductors and metals are also dependent on the doping concentration. The carrier injection in the device is influenced by suitable dopant in the organic semiconductor that leads to the enhancement of device life time [8,9]. Now a days, there is a new trend in doping of organic semiconductor for reducing the contact resistance with metal and lowering the energy barrier at the interface due to band bending [10,11].…”

Section: Introductionmentioning

confidence: 99%

Effect of titanyl phthalocyanine doping on opto-electrical properties of Alq3 thin films

Ramar

Yadav

Srivastava

et al. 2015

J Mater Sci: Mater Electron

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The titanyl phthalocyanine (TiOPc) was doped in tris (8-hydroxy quinolinato) aluminum (Alq 3 ) with concentration of 1, 2 and 3 % by weight. The thin film of undoped and doped Alq 3 was studied extensively for optical and electrical properties. The refractive index of the studied material was found in the range of 1.5-2.07 for 300-1000 nm wavelength. The Urbach tail energy decreases by increase of doping concentration. The PL quenching ratio increases with doping that attribute charge transfer from Alq 3 to the TioPc. The electrical properties of the thin film were studied by impedance spectroscopy over a frequency range of 100 Hz-1 MHz. The undoped and doped Alq 3 shows single relaxation process. The ColeCole plots of undoped and doped device can be represented by a single parallel resistance R P and capacitance C P network with a series resistance R S . The value of R P and C P at zero bias are *146 kX, 87 kX, 814 X and 22 kX and 68, 9, 30 and 29 nF for undoped, 1, 2 and 3 % doping, respectively. The resistance R P decreases with applied bias whereas the capacitance C P remains almost constant. At high frequency, the AC conduction of the film follows the universal power law and the onset frequency increases with increasing bias voltages.

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Section: Introductionmentioning

confidence: 99%

Effect of titanyl phthalocyanine doping on opto-electrical properties of Alq3 thin films

Ramar

Yadav

Srivastava

et al. 2015

J Mater Sci: Mater Electron

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“…When used as a hole‐injection layer in OLEDs, a much reduced turn‐on voltage and improved hole‐injection at the anode is credited to the spherical π‐conjugation of the fullerene molecule helping with charge injection while remaining in low enough concentrations that the bulk properties of the film are that of CuPc . Small molecular composites containing C 60 are also reported to have much improved thermal stability . In order to uncover the principles governing these observed phenomena, we have investigated the physical characteristics of the composite films.…”

Section: Introductionmentioning

confidence: 99%

CuPc:C₆₀ nanocomposite: A pathway to control organic microstructure and phase transformation

Stock

Ogundimu

Baribeau³

et al. 2014

Physica Status Solidi (b)

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Growth and thermal behavior of copper‐phthalocyanine (CuPc) and fullerene (C60) organic nanocomposite thin films, grown on SiO2 and Cu(111) surfaces, have been studied using scanning electron microscopy, X‐ray diffraction (XRD) and scanning tunneling microscopy (STM). It is found that the growth of pure CuPc organic thin films follows an island‐type growth mode. The island formation is found to be dramatically suppressed by the inclusion of C60 during deposition. XRD and STM studies reveal that the CuPc molecular packing is altered upon C60 inclusion, producing disordered CuPc–C60 interfaces. The ordered molecular stacking of CuPc is found to be disrupted completely when C60 concentration reaches 30 wt.%. The thermal stability of the CuPc thin film has been significantly improved upon C60 inclusion. It is suggested that the molecular diffusion kinetics rather than thermodynamics are responsible for the improved stability.

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“…For effective electron injection, metal halides like LiF ͑Ref. 8,10 In this paper, the improvement of both hole injection and device stability could be achieved by using an alkali metal halide on ITO anode side. For better hole injection from an indium tin oxide ͑ITO͒ anode to a hole-transport layer ͑HTL͒, various types of hole injection layers ͑HILs͒ have been utilized between the anodes and HTLs.…”

Section: Introductionmentioning

confidence: 99%

Organic light emitting diodes using NaCl:N,N′-bis(naphthalene-1-yl)-N,N′-bis(phenyl)benzidine composite as a hole injection buffer layer

Kim

Kim²,

Kim

et al. 2010

Journal of Applied Physics

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Composite buffer layers of N , NЈ-bis͑naphthalene-1-yl͒-N,NЈ-bis͑phenyl͒benzidine ͑NPB͒ and NaCl at the anode/organic interface were found to be very effective on the hole injection enhancement from an indium tin oxide anode to the hole-transport layer ͑HTL͒ of NPB. Two maxima of significant current injection with respect to compositional variation were observed, implying multiple injection mechanisms of the tunneling effect and other interfacial effects. From a longer operation lifetime, the enhanced device stability was also confirmed as compared with a standard device with copper phthalocyanine as the hole injection layer. Those results are partly attributed to the better mechanical contact between anode and HTL via the composite buffer, observed from atomic force microscopy measurement.

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Enhanced thermal stability in organic light-emitting diodes through nanocomposite buffer layers at the anode/organic interface

Cited by 33 publications

References 42 publications

Effect of titanyl phthalocyanine doping on opto-electrical properties of Alq3 thin films

Effect of titanyl phthalocyanine doping on opto-electrical properties of Alq3 thin films

CuPc:C₆₀ nanocomposite: A pathway to control organic microstructure and phase transformation

Organic light emitting diodes using NaCl:N,N′-bis(naphthalene-1-yl)-N,N′-bis(phenyl)benzidine composite as a hole injection buffer layer

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Enhanced thermal stability in organic light-emitting diodes through nanocomposite buffer layers at the anode/organic interface

Cited by 33 publications

References 42 publications

Effect of titanyl phthalocyanine doping on opto-electrical properties of Alq3 thin films

Effect of titanyl phthalocyanine doping on opto-electrical properties of Alq3 thin films

CuPc:C60 nanocomposite: A pathway to control organic microstructure and phase transformation

Organic light emitting diodes using NaCl:N,N′-bis(naphthalene-1-yl)-N,N′-bis(phenyl)benzidine composite as a hole injection buffer layer

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Product

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CuPc:C₆₀ nanocomposite: A pathway to control organic microstructure and phase transformation