New transport layers for highly efficient organic electroluminescence devices

Winkler, Berthold; Meghdadi, F.; Tasch, S.; Evers, Bernd; Schneider, Ingo; Fischer, Wolfgang; Stelzer, Franz; Leising, G.

doi:10.1016/s0379-6779(98)01374-5

Cited by 7 publications

(2 citation statements)

References 4 publications

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“…Figure 28 shows the improvement in characteristics achieved by replacing a single layer by multi‐layers. A luminescence as high as 50 000 cd m −2 can be obtained 39…”

Section: Polymers Used In Electroluminescent Devicesmentioning

confidence: 99%

Review of electronic and optical properties of semiconducting π‐conjugated polymers: applications in optoelectronics

Moliton

Hiorns

2004

Polymer International

335

247

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A general overview of the optoelectronic properties of π -conjugated polymers is presented. Two types of polymer are discerned: interchangeable structures of the same energy (degenerate), such as polyacetylene; and non-degenerate polymers, such as poly(para-phenylene). The band structures of degenerate and non-degenerate polymers are related to their conductivities in doped and non-doped states. In both cases, disorder and impurities play an important role in conductivity. Polarons, bipolarons and excitons are detailed with respect to doping and charge transfers. Given the fibrillic nature of these materials, the variable range hopping (VRH) law for semiconducting polymers is modified to account for metallic behaviours. Optoelectronic properties-electroluminescence and photovoltaic activity-are explained in terms of HOMO and LUMO bands, polaron-exciton and charge movement over one or more molecules. The properties of H-or J-type aggregates and their effects on transitions are related to target applications. Device structures of polymer light-emitting diodes are explicitly linked to optimising polaron recombinations and overall quantum efficiencies. The particularly promising use of π -conjugated polymers in photovoltaic devices is discussed.

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“…Figure 28 shows the improvement in characteristics achieved by replacing a single layer by multi‐layers. A luminescence as high as 50 000 cd m −2 can be obtained 39…”

Section: Polymers Used In Electroluminescent Devicesmentioning

confidence: 99%

Review of electronic and optical properties of semiconducting π‐conjugated polymers: applications in optoelectronics

Moliton

Hiorns

2004

Polymer International

335

247

View full text Add to dashboard Cite

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“…Multi-layer device is utilizing hole-transport material between anode and emitting layer, and electron-transport material between emitting layer and cathode in order to improve the mobility of electron and hole. Tris(8-hydroxyquinoline)aluminum, 2-(4-biphenylyl)-5-(4-tertbutylphenyl)-1,3,4-oxadiazole (PBD), 4,4'-bis(N-m-tolyl-N-phenylamino)biphenyl, and poly(N-vinylcarbazole) have been used as the charge-transporting materials in LEDs [29,30]. In case of PBD, the electrons can pass through the PBD layer and easily reach the luminescent polymer, whereas the holes find a high barrier when they reach the polymer/PBD interface.…”

Section: Introductionmentioning

confidence: 99%