Tailor-made nanostructures bridging chaos and order for highly efficient white organic light-emitting diodes

Organic light-emitting diodes (OLEDs) suffer from notorious light trapping, resulting in only moderate external quantum efficiencies. Here, we report a facile, scalable, lithography-free method to generate controllable nanostructures with directional randomness and dimensional order, significantly boosting the efficiency of white OLEDs. Mechanical deformations form on the surface of poly(dimethylsiloxane) in response to compressive stress release, initialized by reactive ions etching with periodicity and depth distribution ranging from dozens of nanometers to micrometers. We demonstrate the possibility of independently tuning the average depth and the dominant periodicity. Integrating these nanostructures into a two-unit tandem white organic light-emitting diode, a maximum external quantum efficiency of 76.3% and a luminous efficacy of 95.7 lm W−1 are achieved with extracted substrate modes. The enhancement factor of 1.53 ± 0.12 at 10,000 cd m−2 is obtained. An optical model is built by considering the dipole orientation, emitting wavelength, and the dipole position on the sinusoidal nanotexture

The effect of flash lamp annealing on the performance of MOTFTs

In this study, we report about investigations on the performance of non-IGZO thin-film transistors (MOTFTs) based on the metal-oxides IAZO and IZO. The metal-oxides for the channel and insulator were coated in a pilot-scale in-line coating machine ILA 900 by rf sputtering of a single magnetron system on 550×670 mm2 glass substrates (Gen 3.5 format) with a thickness of 0.5 mm. After coating, the films were annealed by in-line flash lamp annealing (FLA) in vacuum atmosphere. We investigated the effect of the FLA process step on the carrier mobility and the stability of the MOTFTs

R2R fabrication of thin-film coatings on ultra-thin glass for flexible devices

Ultra-thin flexible glass opens up new fields of applications for high-end electronics. It paves the way for the development of thin, light, robust, curved, and conformable devices. With bend ability similar to other web materials, flexible glass excels in dimensional stability, thermal capability and chemical compatibility. Roll-to-roll processing using PVD deposition would allow efficient low-cost production of functional layers and layer stacks on flexible glass. The development of thin-film coating processes for ultra-thin glass and its integration into organic and hybrid electronic devices are current research topics with the highest priority. In this context we present research and development of indium tin oxide thin-films coated in roll-to-roll mode for ultra-thin flexible glass. Through a steady development of those processes it would be possible to enhance ultra-thin glass for application in advanced electronic devices

Highly stable transparent conductive coatings on ultra-thin glass for flexible devices

Ultra-slim flexible glass is an emerging flexible substrate material for flexible displays, devices or lighting. 100 µm thick flexible glasses with a maximum dimension of 250-300mm2 were deposited with ITO and IZO at room temperature. The films were refined by in-line flash lamp annealing in the millisecond time range

Verfahren zur Herstellung eines Duennschichtsystems

DE 10051509 A UPAB: 20020815 NOVELTY - Production of a thin layer system comprises introducing power into the plasma in the form of a controlled number of pulses during deposition of extremely thin layers; and adjusting the average power during the pulse-one time by three times the power averaged over the whole coating time during the deposition of the layer. DETAILED DESCRIPTION - Preferred Features: The average power during the pulse-one time is adjusted by ten times the power averaged over the whole coating time during the deposition of the layer. The power is periodically or aperiodically introduced into the plasma in the form of a controlled number of pulses. USE - Used in the production of magnetic layer systems (claimed), e.g. for storage media, and flat TV screens. ADVANTAGE - The layer system is reproducible

Tailor-made nanostructures bridging chaosand order for highly efficient white organiclight-emitting diodes

Organic light-emitting diodes (OLEDs) suffer from notorious light trapping, resulting in onlymoderate external quantum efficiencies. Here, we report a facile, scalable, lithography-freemethod to generate controllable nanostructures with directional randomness and dimensionalorder, significantly boosting the efficiency of white OLEDs. Mechanical deformationsform on the surface of poly(dimethylsiloxane) in response to compressive stress release,initialized by reactive ions etching with periodicity and depth distribution ranging from dozensof nanometers to micrometers. We demonstrate the possibility of independently tuning theaverage depth and the dominant periodicity. Integrating these nanostructures into a two-unittandem white organic light-emitting diode, a maximum external quantum efficiency of 76.3%and a luminous efficacy of 95.7 lmW−1 are achieved with extracted substrate modes. Theenhancement factor of 1.53 ± 0.12 at 10,000 cdm−2 is obtained. An optical model is built byconsidering the dipole orientation, emitting wavelength, and the dipole position on thesinusoidal nanotexture