Crosslinkable Organic Semiconductors for Use in Organic Light‐Emitting Diodes (OLEDs)

Meerholz, Klaus; Müller, C. David; Nuyken, Oskar

doi:10.1002/3527607986.ch9

Cited by 14 publications

(4 citation statements)

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“…Consequently, solution processing techniques have received considerable attention although serious problems such as orthogonal solvent systems have to be faced. The most convenient strategy to overcome this drawback has yet been proposed by Nuyken et al applying precursor materials which are converted into insoluble networks by additional crosslinking steps [ 5 , 26 ].…”

Section: The Working Principle Of Oledsmentioning

confidence: 99%

Phosphorescent Organic Light-Emitting Devices: Working Principle and Iridium Based Emitter Materials

Kappaun

Slugovc

List

2008

IJMS

175

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Even though organic light-emitting device (OLED) technology has evolved to a point where it is now an important competitor to liquid crystal displays (LCDs), further scientific efforts devoted to the design, engineering and fabrication of OLEDs are required for complete commercialization of this technology. Along these lines, the present work reviews the essentials of OLED technology putting special focus on the general working principle of single and multilayer OLEDs, fluorescent and phosphorescent emitter materials as well as transfer processes in host materials doped with phosphorescent dyes. Moreover, as a prototypical example of phosphorescent emitter materials, a brief discussion of homo-and heteroleptic iridium(III) complexes is enclosed concentrating on their synthesis, photophysical properties and approaches for realizing iridium based phosphorescent polymers.

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Section: The Working Principle Of Oledsmentioning

confidence: 99%

Phosphorescent Organic Light-Emitting Devices: Working Principle and Iridium Based Emitter Materials

Kappaun

Slugovc

List

2008

IJMS

175

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“…Emissive organic semiconductors are receiving increasing attention nowadays in the development of electronic devices, such as in fabricating white organic light-emitting diodes (WOLEDs) for next-generation solid-state light sources, field-effect transistors, and display applications. − Only the triads of red-, green-, and blue-emissive materials can produce the white light that can revolutionize lighting technology. − In the literature, red/green-emissive materials are widely reported, but blue-emitting materials are limited and have remained a challenge for three decades. The invention of an efficient blue LED based on inorganic semiconductors has contributed to the creation of white light in an entirely new way to us .…”

Section: Introductionmentioning

confidence: 99%

Triphenylene-Based Room-Temperature Discotic Liquid Crystals: A New Class of Blue-Light-Emitting Materials with Long-Range Columnar Self-Assembly

Gupta

Pal

2016

Langmuir

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A straightforward synthesis of multialkynylbenzene-bridged triphenylene-based dyad systems (via flexible alkyl spacers) that self-organize into room-temperature columnar structures over a long range is reported. The compounds with spacer lengths (n) of 8 and 10 exhibit a columnar rectangular mesophase whereas a compound with n = 6 shows a columnar rectangular plastic phase. Interestingly, the later compound (n = 6) shows the formation of well-nucleated spherulites of about several hundred micrometers that suggest the existence of a long-range uniform self-assembly of columns. All of these compounds show blue luminescence in solution and in the thin-film state under long-wavelength (365 nm) UV light. These compounds fulfill the described demands such as long-range columnar self-assembly at room temperature, a good yield with high purity, and blue-light emitters under the neat condition for possible potential applications in semiconductor devices. They also match the criteria of facile processing from the isotropic state because of their low isotropization temperature. This new class of materials is promising, considering the emissive nature and stabilization of the columnar mesophase at ambient temperature.

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“…They concluded that the efficiency needed to be improved and that a potential organic laser has to be a multilayer device . Recently, we have shown that the use of oxetane-functionalized cross-linkable conjugated polymers allows the fabrication of OLEDs with exceptional performance. , These polymers can not only be structured for display applications but also be used to fabricate multilayer devices. − These enable the construction of slab-waveguide devices, enabling low ASE thresholds in the presence of electrodes, mandatory for future electrically driven organic lasers . Finally, cross-linked materials do not soften, which could be an important advantage under very high current drive conditions, where temperatures in excess of 100 °C can easily be attained.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, we investigate the suitability of cross-linkable polyspirobifluorene (PSF) copolymers as gain media for lasing. These materials can be cross-linked photochemically in the presence of a photoinititor by cationic ring-opening polymerization (CROP) . Furthermore, for comparison we have included in our study one of the best (in terms of lifetime and electrical current it can withstand) OLED materials, the PPV-based “Super Yellow” (SY) exhibiting high efficiency and excellent long-term stability, as well as MeLPPP, ,, exhibiting one of the lowest ASE thresholds for solution-processed polymeric materials reported so far.…”

Section: Introductionmentioning

confidence: 99%

Cross-Linkable Polyspirobifluorenes: A Material Class Featuring Good OLED Performance and Low Amplified Spontaneous Emission Thresholds

2009

Self Cite

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We report on an in-depth study of cross-linkable polyspirobifluorene (PSF) copolymers for organic lasing applications. We investigate the performance of the materials in organic light-emitting diodes (OLED) and the optically pumped amplified spontaneous emission (ASE) properties of the new PSF-based devices. The influence of chemical composition and cross-linking of the copolymers is investigated. The cross-linkable polymers presented here exhibit low ASE thresholds and simultaneously good OLED efficiencies. This is exceptional, as we demonstrate that usually only one of these properties is optimized in semiconducting polymers. The ASE threshold in the greenemitting materials is as low as 4.4 μJ/cm 2 under nanosecond excitation. The chemical cross-linking of the polymers into an insoluble network has little effect on the ASE properties. With the material exhibiting the best figure-of-merit we fabricated a slab-waveguide OLED. This OLED exhibits a low, almost preserved ASE threshold compared to a single layer on glass and concomitantly good luminescence efficiency. Overall, the use of these materials in future organic laser diodes seems promising.

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Crosslinkable Organic Semiconductors for Use in Organic Light‐Emitting Diodes (OLEDs)

Cited by 14 publications

References 0 publications

Phosphorescent Organic Light-Emitting Devices: Working Principle and Iridium Based Emitter Materials

Phosphorescent Organic Light-Emitting Devices: Working Principle and Iridium Based Emitter Materials

Triphenylene-Based Room-Temperature Discotic Liquid Crystals: A New Class of Blue-Light-Emitting Materials with Long-Range Columnar Self-Assembly

Cross-Linkable Polyspirobifluorenes: A Material Class Featuring Good OLED Performance and Low Amplified Spontaneous Emission Thresholds

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