Device physics of polymer light‐emitting diodes

Blom, Paul W. M.; Jong, M. J. M. de; Liedenbaum, C.T.H.F.

doi:10.1002/(sici)1099-1581(199807)9:7<390::aid-pat795>3.3.co;2-0

Cited by 15 publications

(19 citation statements)

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“…1B) [6,13]. Recent analysis of the recombination processes in PLEDs has led to the understanding that the strength of Langevin recombination alone is not sufficient to account for the recombination and transport behavior in a PLED [14,15]. However, by inclusion of trap-assisted recombination using the Shockley-Read-Hall (SRH) formalism the experimental PLED data are excellently described (schematically depicted in Fig.…”

Section: Bimolecular and Trap-assisted Recombinationmentioning

confidence: 99%

Non-radiative recombination losses in polymer light-emitting diodes

Kuik

Koster

Dijkstra

et al. 2012

Organic Electronics

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We present a quantitative analysis of the loss of electroluminescence in light-emitting diodes (LEDs) based on poly[2-methoxy-5-(2 0-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV) due to the combination of non-radiative trap-assisted recombination and exciton quenching at the metallic cathode. It is demonstrated that for an MEH-PPV LED the biggest efficiency loss, up to 45%, arises from extrinsic non-radiative recombination via electron traps. The loss caused by exciton quenching at the cathode proves only to be significant for devices thinner than 100 nm. Removal of electron traps by purification is expected to enhance the efficiency of polymer LEDs by more than a factor of two.

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Section: Bimolecular and Trap-assisted Recombinationmentioning

confidence: 99%

Non-radiative recombination losses in polymer light-emitting diodes

Kuik

Koster

Dijkstra

et al. 2012

Organic Electronics

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“…These applications can be developed by improving the surface properties of dye polymer thin films. The general problems in the preparation of polymer surfaces as follow; poor contact between substrate and polymer film, deficiency in the conjugation of immobilized polymer, and controlling the molecular weight of the conducting polymer [6][7][8]. Investigation of nucleation and growth mechanism provides useful information to determine the optimum experimental conditions in the preparation of dye thin films and helps to recover the problems mentioned above by controlling morphology, density, crystallinity, and degree of solvation of the polymer film [9].…”

Section: Introductionmentioning

confidence: 99%

Chronoamperometric and morphological investigation of nucleation and growth mechanism of poly(azure A) thin films

Kalyoncu

Alanyalıoğlu

2011

Journal of Electroanalytical Chemistry

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“…Recently, we have developed routes utilizing electrochemical copolymerization and layer‐by‐layer polymerization to construct cross‐linked networks, which are very promising candidates for applications in color‐stable white electroluminescent films and devices 6, 7. Considering that the deposited polymer films are physically attached to the electrode, the contact between the organic and electrode interface may be poor, possibly decrease the long‐term stability of the device 8. EP films chemically bonded to electrodes may be desirable for increasing the lifetime of the devices.…”

Section: Introductionmentioning

confidence: 99%

Electroactive Self‐Assembled Monolayers for Enhanced Efficiency and Stability of Electropolymerized Luminescent Films and Devices

Yao

et al. 2011

Adv Funct Materials

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In order to further improve the efficiency and stability of luminescent electrochemical polymerization (EP) films and devices, electroactive self‐assembled monolayers (SAMs) of carbazolyl alkanethiol are successfully designed and applied to modify Au electrode and covalently graft the deposited EP films. The analysis of the formation and coverage of the SAMs by atomic force microscopy (AFM), cyclic voltammetry (CV), and the theoretical calculation provide consistent results indicating the SAM molecules are densely packed and standing upright (liquid‐like) on the Au surface. In addition, ultraviolet photoelectron spectroscopy (UPS), CV, UV, AFM, and sonication treatment reveal that the close‐packed electroactive SAMs are effective at enhancing the work function of electrode, increasing the deposition rate of EP precursor as well as elevating the cross‐linking efficiency and the adhesive property of subsequent EP films. This is a simple and very efficient method for improving the performance of EP device, which has potential applications in display devices.

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Device physics of polymer light‐emitting diodes

Cited by 15 publications

References 0 publications

Non-radiative recombination losses in polymer light-emitting diodes

Non-radiative recombination losses in polymer light-emitting diodes

Chronoamperometric and morphological investigation of nucleation and growth mechanism of poly(azure A) thin films

Electroactive Self‐Assembled Monolayers for Enhanced Efficiency and Stability of Electropolymerized Luminescent Films and Devices

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