Transient electroluminescence from single- and double-layer light-emitting diodes (LEDs) based on polymer blends

Pommerehne, J.; Vestweber, H.; Tak, Yoon Heung; Bäßler, H.

doi:10.1016/0379-6779(95)03421-f

Cited by 89 publications

(35 citation statements)

References 14 publications

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“…2 Unilayer polymer LEDs with conducting polymeric material sandwiched between two electrodes are of special interest due to simplicity of their manufacture and shorter response time in compare to multilayer structures. 3 However, in these LEDs the efficiency is often limited by the lack of effective bipolar transport. 4 This leads to the imbalance of electron and hole injection from the electrodes and hence to poor charge carrier recombination in the bulk.…”

mentioning

confidence: 99%

Bright blue–green electroluminescence from aromatic polyimides

Mal’tsev

Brusentseva

Kolesnikov

et al. 1997

Applied Physics Letters

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New polyimide type of polymers, aromatic polyimides (APIs) containing sulphur atoms in the backbone, were investigated as electron-hole transporting and light-emitting materials for use in unilayer electroluminescent diodes. The simplicity of synthesis, high thermal stability, organic solvent solubility together with excellent film-forming properties make the APIs potentially of interest for technological applications.

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mentioning

confidence: 99%

Bright blue–green electroluminescence from aromatic polyimides

Mal’tsev

Brusentseva

Kolesnikov

et al. 1997

Applied Physics Letters

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“…Tremendous efforts have been directed toward improving the performance of OLEDs [2]- [5]. One of the conditions of achieving high emission efficiency in OLEDs is a balance of the hole-electron injection [6], [7]. It is not trivial since, in general, there is a big difference in the hole and electron mobilities [8].…”

Section: Introductionmentioning

confidence: 99%

Improving the Performance of Organic Light-Emitting Diodes Containing BCP/LiF/Al by Thermal Annealing

Sun

Zhu

et al. 2006

J. Display Technol.

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Abstract-In this paper, we examined the effect of postpackaging annealing on the performance of organic light-emitting diodes containing tris-(8-hydroxyquinoline) aluminum (Alq 3 ) or 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) in direct contact with a LiF-Al bilayer cathode. The detailed electroluminescent (EL) characteristics were compared before and after annealing at 70 C for 5 hrs. It was found that better luminous efficiency as well as greater power efficiency could be achieved for devices with BCP/LiF/Al structure. However, other devices consisting of Alq 3 LiF/Al were less affected. It is believed that the thermal treatment helps to enhance the electron injection for the former, and less helpful for the latter.

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“…EL will not, therefore, be emitted before the front of the electron cloud has moved about 15 nm into the bulk of the sample. Depending on the ratio of hole and electron mobilities it may be the latter that determines the delay time of EL [44]. [45].…”

Section: Charge Transportmentioning

confidence: 99%

Injection, transport and recombination of charge carriers in organic light-emitting diodes

Bäßler

1998

Polym. Adv. Technol.

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Depending on the magnitude of the energy barrier for charge carrier injection from the electrode(s) the current flowing through a light‐emitting diode (LED) can be either space charge‐limited or injection‐limited. The first alternative, reflected in j(E) characteristics obeying Child’s law, requires the electrode to be ohmic. Various injection models are discussed, favoring a hopping description for the escape of a charge carrier from the image charge potential in an energetically disordered system. Information concerning the mobility of charge carriers can be inferred from time of flight studies, from space charge limited currents, as well as from transient absorption due to the momentary space charge stored inside the sample. A simple model, building on the proven validity of Langevin‐type electron hole recombination in organic solids, is able to explain the recombination yield in single‐layer LEDs as a function of the cell current. A more elaborate analytic theory is described for bilayer systems in which internal energy barriers give rise to charge accumulation and to a concomitant redistribution of the electric field. © 1998 John Wiley & Sons, Ltd.

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Transient electroluminescence from single- and double-layer light-emitting diodes (LEDs) based on polymer blends

Cited by 89 publications

References 14 publications

Bright blue–green electroluminescence from aromatic polyimides

Bright blue–green electroluminescence from aromatic polyimides

Improving the Performance of Organic Light-Emitting Diodes Containing BCP/LiF/Al by Thermal Annealing

Injection, transport and recombination of charge carriers in organic light-emitting diodes

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