Diamond-like carbon films as electron-injection layer in organic light emitting diodes

Lmimouni, K.; Legrand, Céline; Dufour, C.; Chapoton, A.; Belouet, C.

doi:10.1063/1.1367900

Cited by 30 publications

(15 citation statements)

References 17 publications

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“…For example, Lmimouni et al [15] obtained two orders of magnitude increase in the injection-current of the polymer-based light emitting diodes, namely the ITO/P3OT/DLC/Al and ITO/DLC/ P3OT/Al devices but the effects on their brightness were not reported in the article. Han et al [16] obtained two orders of magnitude increase in the current in ITO/ PEDOT:PSS/MEH-PPV/DLC/Al device using 1.5 nm DLC, but the OLED brightness decreased significantly.…”

Section: Introductionmentioning

confidence: 99%

Parametric Studies of Pulsed Laser Deposition of Indium Tin Oxide and Ultra-thin Diamond-like Carbon for Organic Light-emitting Devices

Tou¹,

Yong²,

Yap³

et al. 2009

Journal of the Optical Society of Korea

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Device quality indium tin oxide (ITO) films are deposited on glass substrates and ultra-thin diamond-like carbon films are deposited as a buffer layer on ITO by a pulsed Nd:YAG laser at 355 nm and 532 nm wavelength. ITO films deposited at room temperature are largely amorphous although their optical transmittances in the visible range are > 90%. The resistivity of their amorphous ITO films is too high to enable an efficient organic light-emitting device (OLED), in contrast to that deposited by a KrF laser. Substrate heating at 200℃ with laser wavelength of 355 nm, the ITO film resistivity decreases by almost an order of magnitude to 2×10 -4 Ω cm while its optical transmittance is maintained at > 90%. The thermally induced crystallization of ITO has a preferred <111> directional orientation texture which largely accounts for the lowering of film resistivity. The background gas and deposition distance, that between the ITO target and the glass substrate, influence the thin-film microstructures. The optical and electrical properties are compared to published results using other nanosecond lasers and other fluence, as well as the use of ultra fast lasers.Molecularly doped, single-layer OLEDs of ITO/(PVK+TPD+Alq3)/Al which are fabricated using pulsed-laser deposited ITO samples are compared to those fabricated using the commercial ITO. Effects such as surface texture and roughness of ITO and the insertion of DLC as a buffer layer into ITO/DLC/(PVK+TPD+Alq3)/Al devices are investigated. The effects of DLC-on-ITO on OLED improvement such as better turn-on voltage and brightness are explained by a possible reduction of energy barrier to the hole injection from ITO into the light-emitting layer.

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Section: Introductionmentioning

confidence: 99%

Parametric Studies of Pulsed Laser Deposition of Indium Tin Oxide and Ultra-thin Diamond-like Carbon for Organic Light-emitting Devices

Tou¹,

Yong²,

Yap³

et al. 2009

Journal of the Optical Society of Korea

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“…It can be concluded that each metallic cluster is bound to the organic monolayer surface through either three or four pyridine anchoring groups, corresponding respectively to (CF 3 attached to the cluster core, a (-3) charge must be carried by three triflate moieties in order to maintain the total charge balance.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Surface immobilization of Mo6I8 octahedral cluster cores on functionalized amorphous carbon using a pyridine complexation strategy

Godet

Ababou‐Girard

Fabre

et al. 2015

Diamond and Related Materials

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International audienceTetrahedral amorphous carbon (a-C) films have been grown by pulsed laser deposition to investigate a liquid phase process for surface immobilization of electroactive [Mo6Ii8]4 + transition metal cluster cores using a complexation reaction with a pyridine-terminated alkyl monolayer covalently bonded to the a-C surface (PyS–alkyl/a-C). These films are stable against thermally-assisted grafting of alkene molecules and the covalent Csingle bondC interface provides a robust monolayer/a-C assembly. Octahedral [Mo6Ii8]4 + cluster cores with iodine inner ligands and labile triflate apical ligands [Mo6Ii8(CF3SO3)a6]2 − have been immobilized through partial complexation in apical positions by surface pyridine groups (PyS). The remaining CF3SO3− apical ligands of [Mo6Ii8 (PyS)ay(CF3SO3)a6 − y] cluster units were further substituted with bromopyridine (Py-Br) to obtain air stable surface with expected final composition [Mo6Ii8 (PyS)ay(Py-Br)a6 − y]. The yield of the different reaction steps is followed by X-ray photoelectron spectroscopy, providing cluster coverage ΣMo6I8 = 9 × 1012 cm− 2. Each [Mo6I8]4 + cluster is bound to the carbon surface through multiple anchoring metal sites (NPYR = 3 or 4), indicating that pyridine-terminated alkyl chains are flexible enough to accommodate four bonds. Electrical transport through Hg//Mo6I8–PyS–alkyl/a-C/p-Si(111) junctions shows rectifying current–voltage characteristics but does not reveal any signature of cluster immobilization

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“…It was first reported to enhance the electron injections when inserted between the cathode and polymer layer [1]. Current injection of the device (Indium Tin Oxide (ITO)/conducting polymer/ DLC/Ni) increased and the effect was attributed to the reduction of electron injection barrier by the insertion of DLC.…”

Section: Introductionmentioning

confidence: 99%

Effects of diamond-like carbon in TPD-Alq3 doped PVK organic light-emitting devices

Yap¹,

Yang²,

Yong³

et al. 2009

Diamond and Related Materials

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Diamond-like carbon films as electron-injection layer in organic light emitting diodes

Abstract: Ultrathin layer alkaline earth metals as stable electron-injecting electrodes for polymer light emitting diodes

Cited by 30 publications

References 17 publications

Parametric Studies of Pulsed Laser Deposition of Indium Tin Oxide and Ultra-thin Diamond-like Carbon for Organic Light-emitting Devices

Parametric Studies of Pulsed Laser Deposition of Indium Tin Oxide and Ultra-thin Diamond-like Carbon for Organic Light-emitting Devices

Surface immobilization of Mo6I8 octahedral cluster cores on functionalized amorphous carbon using a pyridine complexation strategy

Effects of diamond-like carbon in TPD-Alq3 doped PVK organic light-emitting devices

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