New Thermally Cross-Linkable Polymer and Its Application as a Hole-Transporting Layer for Solution Processed Multilayer Organic Light Emitting Diodes

Ma, Biwu; Lauterwasser, Frank; Deng, Lan; Zonte, C. Sebastian; Kim, Bumjoon J.; Fréchet, Jean M. J.; Borek, Carsten; Thompson, Mark E.

doi:10.1021/cm0715500

Cited by 123 publications

(94 citation statements)

References 38 publications

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“…The prepared carbazole-containing monomer could be copolymerized with vinylic benzocyclobutene (BCB) by radical polymerization. 16 The intermediate would be a precursor material to form thermally cross-linkable hole-transporting macromolecules for solution processing of multilayer OLEDs.…”

Section: Notesmentioning

confidence: 99%

Diversification of Carbazoles by LiCl-mediated Catalytic CuI Reaction

Cho¹,

Ryu²,

Kwon³

et al. 2011

Bulletin of the Korean Chemical Society

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Section: Notesmentioning

confidence: 99%

Diversification of Carbazoles by LiCl-mediated Catalytic CuI Reaction

Cho¹,

Ryu²,

Kwon³

et al. 2011

Bulletin of the Korean Chemical Society

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“…In situ cross-linking reactions have also been explored to afford covalently bound structures that are highly resistant to processing solvents [11][12][13][14][15][16][17][18][19] . Despite their high mechanical robustness and compatibility with subsequent solution processing, polymers are plagued by limited reproducibility in the device performance because of batch-tobatch variations with respect to molecular weight, polydispersity, regioregularity and purity [20][21][22][23] .…”

mentioning

confidence: 99%

Solution-processed multilayer small-molecule light-emitting devices with high-efficiency white-light emission

et al. 2014

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Recent developments in the field of p-conjugated polymers have led to considerable improvements in the performance of solution-processed organic light-emitting devices (OLEDs). However, further improving efficiency is still required to compete with other traditional light sources. Here we demonstrate efficient solution-processed multilayer OLEDs using small molecules. On the basis of estimates from a solvent resistance test of small host molecules, we demonstrate that covalent dimerization or trimerization instead of polymerization can afford conventional small host molecules sufficient resistance to alcohols used for processing upper layers. This allows us to construct multilayer OLEDs through subsequent solution-processing steps, achieving record-high power efficiencies of 36, 52 and 34 lm W À 1 at 100 cd m À 2 for solution-processed blue, green and white OLEDs, respectively, with stable electroluminescence spectra under varying current density. We also show that the composition at the resulting interface of solution-processed layers is a critical factor in determining device performance.

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“…In an effort to emulate this, multilayer solution processable PLEDs have been suggested by many based on water-alcohol-soluble polymers salts [3][4][5] or inorganic ionic materials. 6 Other methods like thermally or UV cross-linked hole transporting layer, [7][8][9] insoluble interlayer of various conjugated polymers forms upon annealing, 2,10 and intermediate liquid buffer layer 11 have also been used to spin-coat multilayer devices. High molecular weight PVK has also been used as a hole transport layer in a blue emitting polymeric light emitting devices, where blue emissive layer spin on the top of it.…”

Section: Introductionmentioning

confidence: 99%

Solution processed multilayer polymer light-emitting diodes based on different molecular weight host

Al-Attar

Monkman

2011

Journal of Applied Physics

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Solution processed multilayer polymer light-emitting diodes (PLEDs) based on different molecular weight host have been investigated. A PLED based on high molecular weight poly (vinyl carbazole) PVKH and low molecular weight poly (vinyl carbazole) PVKL, doped with iridium, tris(2-phenylpyidine) Ir(ppy)3 as a host-guest emitting layer (EML), shows a dramatic increase in device efficiency. When the PVKH was used as a hole transport electron blocking layer (HT-EBL), effective electron blocking was achieved, which leads to an increase exciton population in the phosphorescent zone. The use of low molecular weight PVKL as a host material in the top layer prevents barrier formation for hole transport from the poly(3,4-ethylenedioxy-thiophene) (PEDOT)–EBL to the EML. External quantum efficiency of 11%, current efficiencies of 38 cd/A, power efficiency of 13 lm/W and brightness of 7000 cd/m2, were obtained. The effect of the PVKH layer on the electrical and optical device characteristics was investigated. Simulation of the optical outcoupling using SETFOS 3.1 software is in agreed with the observed results and allowed us to predict the emissive dipole location and distribution in the EML layer. The effect of the PVKH on the exciton quenching by the electrodes was also investigated using time resolved fluorescence photon counting, which indicates weak exciton quenching by the PEDOT layer and the device enhancement predominantly achieved by exciton confinement in the emissive layer.

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New Thermally Cross-Linkable Polymer and Its Application as a Hole-Transporting Layer for Solution Processed Multilayer Organic Light Emitting Diodes

Cited by 123 publications

References 38 publications

Diversification of Carbazoles by LiCl-mediated Catalytic CuI Reaction

Diversification of Carbazoles by LiCl-mediated Catalytic CuI Reaction

Solution-processed multilayer small-molecule light-emitting devices with high-efficiency white-light emission

Solution processed multilayer polymer light-emitting diodes based on different molecular weight host

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