Effect of various ions on organic light-emitting diodes obtained by ion-beam-assisted deposition

Antony, Rémi; Moliton, André; Ratier, Bernard

doi:10.1007/pl00021156

Cited by 9 publications

(9 citation statements)

References 1 publication

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“…Overall, 100 eV T + SPIAD produces films with the highest molecular weight species of the films examined here. These results show that SPIAD films produced by polyatomic ions are in fact distinct from those produced by atomic ion-assisted deposition [4,6], indicating a role of the polyatomicity of the incident ion. The use of distinct ion and neutral sources therefore appears justified in SPIAD, in contrast to other methods that incorporate one source for both species [7,8].…”

Section: Resultsmentioning

confidence: 97%

“…The question addressed is whether it matters if polyatomic ions are used in SPIAD or if the same films are produced by atomic ions. Previous reports examined 1387 the effect of ions -either polyatomic [7,8] or atomic [4,6] -on the optical or optoelectronic properties of organic films formed by ion-assisted deposition. These reports showed that both polyatomic and atomic ions induce significant changes in optical or optoelectronic properties of films compared to their evaporated film counterparts.…”

Section: Introductionmentioning

confidence: 99%

“…Control of optical band gaps and emission in such films has been most commonly achieved through electrochemical and chemical synthesis methods [2,3], but there is strong interest in other methods that allow improved in situ control and modification of film properties. Ion-assisted deposition is one method previously shown to allow control of optoelectronic properties of organic films [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Polyatomicity and kinetic energy effects on surface polymerization by ion-assisted deposition

Choi

Zachary

Tepavcevic

et al. 2005

International Journal of Mass Spectrometry

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polyatomicity and kinetic energy effects on surface polymerization by ion-assisted deposition

Choi

Zachary

Tepavcevic

et al. 2005

International Journal of Mass Spectrometry

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“…The use of ion beam assisted deposition at very low ion energy (100 eV) has been studied at our laboratory in the case of small organic molecule active layers of OLEDs based on 8-tris-hydroxy-quinoline aluminium (Alq3) [1] [2]. The quantum efficiency of these devices has been increased by more than one order of magnitude when helium ions are used in the IBAD process of the Alq3 layer.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Organic Device Cathode Obtained by Ion Beam Assisted Deposition

Chakaroun

Ratier

Moliton

2006

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

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Organic devices like solar cells or light emitting diodes (OLEDs) are intensively studied since the last years and are potentially able to reach the market. Nevertheless both polymer or small molecule based devices behave poor stability in open air conditions so that encapsulation process will by essential. A solution would be to use the top electrode (generally the cathode) as the encapsulating layer. In this case Ion Beam Assisted Deposition (IBAD) of the layer is an accurate process to obtain a dense layer which can act as a barrier to moisture and oxygen. First, a computer simulation, with the SRIM code based on the binary collision approximation, of a low energy argon ion beam interaction with an aluminium layer describes the densification effect of the IBAD process. It is found that the densification process is obtained by the aluminium recoil atom replacements which are preferentially located in a first domain near the surface, corresponding to the lacunas occurred by ion implantation, and a domain deeper than the mean free pass of the ions. Due to this latter replacement domain, a non assisted buffer layer is needed in the case of direct deposition of the metallic electrode on optically active organic layer, in order to avoid recoils atoms to act as traps. Then this process will be illustrated in the case of life time improvement of small molecule based OLEDs.

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“…It should be noted that a͒ the monolayer structure ITO/ Zn͑bis-salen-4͒ 2 / Ca+ Al remains quite common. 5 While more complicated structures have been investigated, [6][7][8][9][10] the aim of this article is to present a general optical characterization of OLEDs which can be applied whatever the physical or chemical structure of the device. It is for this reason that we have characterized the optoelectronic properties of different structures based on either ITO/HTL/Alq3 or Zn͑bis-salen-4͒ 2 / Ca+ Al or ITO/ HTL/HIL/Alq3 or Zn͑bis-salen-4͒ 2 / Ca+ Al layers with widely available photodiodes and standard laboratory apparatus.…”

Section: Introductionmentioning

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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Effect of various ions on organic light-emitting diodes obtained by ion-beam-assisted deposition

Cited by 9 publications

References 1 publication

Polyatomicity and kinetic energy effects on surface polymerization by ion-assisted deposition

Polyatomicity and kinetic energy effects on surface polymerization by ion-assisted deposition

Modelling of Organic Device Cathode Obtained by Ion Beam Assisted Deposition

Optical characterization of polychromatic organic light emitting diodes

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