Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"outcoupling"”.
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The Optical Outcoupling of Organic Light Emitting Diodes
OLEDs have seen a strong growth in development in recent years, however up to 80% of emitted light may be lost within the OLED stack and in the substrate layers. This thesis investigates the effects of the layer stack on the OLED properties and also studies a number of approaches to substrate …
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Photon Generation and Dissipation in Organic Light-Emitting Diodes
… enhancement of planar OLEDs. In particular, outcoupling strategies to extract trapped photons to obtain highly efficient OLEDs are investigated.
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Elastomeric contact printing for sub-micron patterning of organic films
… internal reflection and thereby enhance the outcoupling of light from the device.
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Incorporating double-heterojunction in anisotropic semiconductor nanocrystals for novel optoelectronic applications
… quantum efficiency being achieved leaves light outcoupling as the only remaining means to improve external quantum efficiency (EQE) but that might require radically different device design and reoptimization. However, the current state-of-the-art QD-LEDs are based on spherical core/shell QDs, …
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Device physics of perovskite light-emitting diodes
… we develop a strategy to improve light outcoupling in PeLEDs by enhancing the photon recycling in perovskites. In the last study, we identify that the unique device characteristics of PeLEDs necessitates a more profound understanding of their device physics. We then develop an …
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High efficiency top-emitting organic light-emitting diodes: design and fabrication
… are discussed. Also, the mechanism of light outcoupling enhancement by a capping layer is discussed there. In the last part of Chapter 4, the influence of the optical device structure on the intrinsic quantum yield of the emitters is studied. Chapter 5 is focused on inverted top-emitting …
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Evaluation of a planar optic waveguide as a platform for evanescent field chemical sensor development
… in mode crosstalk, and changes in mode outcoupling position on the array detector. Thus, chemometrics are necessarily employed to waveguide multiple mode response data to aid in interpretation and response calibration. The application of chemometrics to the Ag$\sp+$-exchange waveguide …
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Liquid crystals for light emitting diodes
… lasers and can also be employed to enhance the outcoupling of OLEDs.
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Ultra-thin photovoltaic technologies with nanophotonic textures for enhanced solar energy harvesting
… substrate by means of a rear mirror, and iii) outcoupling losses by means of light-trapping textures. Simultaneous application of these strategies, within architectures possessing maximal transparency outside the active region, is imperative to target competitive photovoltaic efficiencies on …
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Exploring charge carrier dynamics in quantum dot and double heterojunction nanorod light emitting devices using transient electroluminesence measurements
… the rod structure can enhance light outcoupling efficiency as compared to the core-shell (CSQD) morphologies. Despite these advantages, the DHNR light emitting devices exhibit similar efficiency losses as their CSQD counterparts, the source of which are attributed to the location and …
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Quanteneffizienz und Langzeitstabilität monochromer organischer Leuchtdioden
Den Fokus dieser Arbeit bildet die Untersuchung und die konzeptionelle Verbesserung der wichtigsten Eigenschaften organischer Leuchtdioden (OLED) – die Lebensdauer und die Quantenausbeute, welche sich durch die interne und externe Quanteneffizienz kategorisieren lässt. Es werden monochrome pin- …