Enhanced organic light-emitting diode based on a columnar liquid crystal by integration in a microresonator

Kasdorf, Olga; Vollbrecht, Joachim; Ohms, B.; Hilleringmann, Ulrich; Böck, Harald; Kitzerow, Heinz‐S.

doi:10.1002/er.3127

Cited by 20 publications

(15 citation statements)

References 57 publications

(121 reference statements)

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“…22 Another promising aspect of LC-OSCs is the possibility to remove defects that occur during the manufacturing process of thin films by heating these films into their LC-phase and slowly cooling them down again, which is commonly referred to as self-healing. 23 In particular, OSCs with LC properties have been investigated for OLED-, [24][25][26][27] OPV-, 28,29 and OFET-applications, 30 among other examples. [31][32][33] Here we present the detailed photophysical analysis, and study the applicability as emitter materials in OLEDs of four different types of dibenzo[a,j ]coronene-tetracarboxylic alkyl esters and imides with either a centrosymmetric bis-peri (1 & 3) or a polar bis-ortho (2 & 4) substitution pattern ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Curved Polar Dibenzocoronene Esters and Imides versus Their Planar Centrosymmetric Homologs: Photophysical and Optoelectronic Analysis

et al. 2019

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Isomeric columnar liquid crystalline dibenzo[a,j ]coronene-tetracarboxylic tetraesters and bisimides that differ only by having either a centrosymmetric bis-peri or a polar bis-ortho substitution pattern, exhibit striking differences in the makeup of their electronic ground and excited states, as well as in their performance as emitters in electroluminescent diodes. Quantum chemical calculations show that the key molecular orbitals consist essentially of perylene-like ones responsible for the longest-wavelength absorptions, and coronene-like ones responsible for the very intense shorter-wavelength absorptions, with modifications in particular for the ortho-imide due to its pronounced deviation from planarity. Additionally, the ortho-imide and ortho-ester, which tend to a slipped-stacked configuration within their columns due to their non-planarity, strongly outperform their peri-counterparts as emitters in organic light emitting diodes.

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Section: Introductionmentioning

confidence: 99%

Curved Polar Dibenzocoronene Esters and Imides versus Their Planar Centrosymmetric Homologs: Photophysical and Optoelectronic Analysis

et al. 2019

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“…Perylene diimides are known to be good electron acceptors and are thus suitable for electron transporting purposes . While the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of perylene esters and their derivatives tend to be at higher energies than their diimide counterparts, they are still considered to be viable electron transporting materials …”

Section: Methodsmentioning

confidence: 99%

“…[36,46] While the highest occupied molecular orbital( HOMO) and lowest unoccupied molecular orbital( LUMO) of perylene esters and their derivativest end to be at higher energies than their diimidec ounterparts, they are still considered to be viable electron transporting materials. [28,50] The focus of this paper is to comparec ompounds 1, 2,a nd 3 as emitter materials for OLED applications.W hile compounds 1 and 3 wereu sed earlier, [29,47,[49][50][51] compound 2 has not been used in organic light emitting devices so far.T he electroluminescent behavior-inp articular the spectral properties and color perception-and the optoelectronic behavior-currentvoltage-luminance characteristics and the role of hole transporting materials such as TPD-are examinedf or the three emitter materials. Especially the direct comparison in performance is as ubject of investigation.…”

Section: Methodsmentioning

confidence: 99%

“…[23] The impact of LC-OSCsi su nderscoredb yt he wide variety of devices implementing these compounds. [24][25][26] Among others, these include OLEDs-both for display [27,28] and lighting applications, [29,30] OPVs, [31,32] OFETs, [33,34] and chemical or thermals ensors. [35] In particular,the expansive group of perylened erivatives has shownt oc ontain promising candidates for OE applications.…”

Section: Introductionmentioning

confidence: 99%

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Electroluminescent and Optoelectronic Properties of OLEDs with Bay‐Extended, Distorted Perylene Esters as Emitter Materials

et al. 2017

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Three esters with a perylene, a unilaterally, and a bilaterally extended perylene core, respectively, were used as emitter materials for organic light-emitting diodes. The electroluminescent properties of these devices were studied. Different spectral shifts were found, which can be attributed to the formation of excited dimers (excimers) in the nanofilms of the emitter materials. Thermal treatment of the unilaterally extended derivative resulted in a red-shift of the electroluminescence owing to the formation of a denser nanofilm. The luminance and efficiency of optoelectronic devices employing the extended perylene esters exceed those of devices using an emitter layer comprised of the perylene ester. Different deposition methods, limitations in the deposition process, and the role of hole-transporting materials are compared.

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“…Kasdorf et al . investigated resonant cavity‐enhanced light‐emitting diodes. Their sandwiched LED design consisted of an electroluminescent liquid crystal between a Bragg mirror deposited on a silicon substrate and a semitransparent top electrode, which enhanced the maximum electroluminescence intensity by a factor of 3–4.…”

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Nano energy technologies

Ali

Lund

2014

Int. J. Energy Res.

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The International Journal of Energy Research (IJER) recognized early on the potential and opportunities of nanomaterials and nanotechnology for energy applications. In the past, several special issues on this theme have been published and separate papers in this category have been regularly published [1,2]. Through improved physical and chemical properties such as increased catalytic activity, large specific surface area, or new functionalities, nanomaterials have shown their applicability for a range of energy technologies such as solar cells, batteries, hydrogen technologies, among others. Nanotechnology is becoming a standard tool to improve the performance or to reduce the cost of novel energy systems. New nano energy devices such as energy harvesting are also emerging.While IJER has launched specific calls for papers in nanotechnology for energy in the past, this time we have chosen extended papers from the 7th International Conference on Surfaces, Coatings & Nanostructured Materials (NANOSMAT 7) which was held in Prague, The Czech Republic, in autumn 2012. A few other paper submissions of interest are also included here. The NANOSMAT conferences have traditionally included several sessions on nanomaterials for energy showing an increasing interest among the science community in this research topic. NANOSMAT conferences have been running since 2005 and due to their great success NANOSMAT-USA and NANOSMAT-Asia have been launched.The papers in this IJER Special Issue on nanotechnology for energy applications deal with solar cells, light-emitting diodes, Li-ion batteries, hydrogen storage, fuel cells, hydrogen production, and energy harvesting. A range of different nanomaterials are also covered such as carbon nanospheres, carbon nanotubes, nanoparticles, nanocomposites, etc. Altogether 14 papers are included in the special issue. A short summary of each paper is presented in the next to introduce the readers of the journal into this special issue.Tsai et al.[3] investigated CuInS 2 thin film solar cells in their paper. They looked on the effects of sulfurization and the Cu/in-ratio on the film quality and morphology, which depend very much on the processing conditions. A solar cell with an efficiency of 6.29% was produced.Pimanpang et al.[4] fabricated dye-sensitized solar cells on plastics and stainless steel. The stainless steel was coated with a film of TiO 2 nanoparticles and the plastic was made conductive through deposition of Pt-nanoparticles. This fully flexible DSSC solar cell showed an efficiency of 2.72%.Su et al.[5] used ZrO 2 nanoparticles to improve the light transmission for a natural pigment-sensitized solar cell in a water-based electrolyte. The nanoparticles improved the light transmission by a factor of eight. An environmentally friendly solar cell with an efficiency of 0.688 % was produced.Ray et al.[6] studied the effect of nitrogen functionalization on the structure of carbon spheres which can potentially be used for energy applications such as solar cells and capacitors. Kasdorf et al. ...

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Enhanced organic light-emitting diode based on a columnar liquid crystal by integration in a microresonator

Cited by 20 publications

References 57 publications

Curved Polar Dibenzocoronene Esters and Imides versus Their Planar Centrosymmetric Homologs: Photophysical and Optoelectronic Analysis

Curved Polar Dibenzocoronene Esters and Imides versus Their Planar Centrosymmetric Homologs: Photophysical and Optoelectronic Analysis

Electroluminescent and Optoelectronic Properties of OLEDs with Bay‐Extended, Distorted Perylene Esters as Emitter Materials

Nano energy technologies

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