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 16 of 16 for “"Organic LEDs"”.
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Organic LEDs for optoelectronic neural networks
… thesis, I investigate the characteristics of Organic Light Emitting Diodes (OLEDs) and assess their suitability for use in the Compact Optoelectronic Integrated Neural (COIN) coprocessor. The COIN coprocessor, a prototype artificial neural network implemented in hardware, seeks to implement …
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Enhancing the efficiency of organic LEDs through spin-orbit coupling of charge-transfer states
… of enhancing the efficiency of small molecule organic light-emitting diodes through spin-orbit effects is examined. Because only singlet spin states, statistically one quarter of the total possible states, emit fluorescent light, it has generally been thought that a maximum of 25% efficiency …
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Integrated feedback circuit for organic LED display driver
Organic LEDs (OLEDs) offer the potential of ultra low power, portable display technology. The chief barrier to their usage lies in producing OLEDs that will emit light at predictable and consistent amplitudes. We propose the use of optical feedback to generate the desired luminosity pixel by pixel. …
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A silicon current sensing amplifier and organic imager for an optical feedback OLED display
Organic LEDs (OLEDs) have the potential to be used to build thin, flexible cost effective displays. Currently, the primary drawback to their usage lies in the difficulty of producing OLEDs that emit light at a constant and predictable brightness over their lifetime. This leads to a non-uniform …
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An integrated circuit for feedback control & compensation of an organic LED display
Organic LEDs (OLEDs) have the potential to be used to build large-format, thin, flexible displays. Currently, the primary drawback to their usage lies in the difficulty of producing OLEDs which emit light at a constant and predictable brightness over their lifetime. A solution has been proposed …
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Printed microscale inorganic light emitting diodes on flexible substrates for display, biomedical, and robotic applications
… materials, design, and integrating strategies, inorganic semiconductor materials can be utilized as active components, integrated with flexible platforms. The deterministic transfer printing technique can generate this outcome where the single-crystalline semiconductor active components retain its …
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Design and synthesis of nanocrystal heterostructures for optoelectronic applications
… applications including light emitting devices (LEDs) and photovoltaics. Their narrow emission spectra make them excellent fluorophors for use in red, green and blue emitting organic LEDs and have been shown to achieve external quantum efficiencies as high as 2.7%, 1.8% and 0.4% respectively. …
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Colloidal semiconductor nanocrystals as nanoscale emissive probes in light emitting diodes and cell biology
… the physics of light emitting diodes (LEDs), as well as to unveil properties of cells that conventional imaging techniques cannot reveal. On the LED side, in particular, Chapter 2 utilizes individual NCs to alter layered organic LED structures at nanometer scale, resulting in spectrally …
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Device physics of perovskite light-emitting diodes
… of perovskite light-emitting diodes (PeLEDs) has increased rapidly to over 25%, which is comparable with that of organic LEDs. The behaviour of PeLEDs is determined by the device processes including charge injection and transport, recombination and light extraction. Understanding the …
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Advances in molecular scale electronics: Synthesis and testing of nanoscale wires and devices
… The use of a discrete, highly conjugated organic molecule as a molecular scale wire to conduct an electric current has been demonstrated. We have developed molecular scale gates, from organic molecules, that can be altered "on" and "off" with the use of an electric field. Additionally, we …
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Alternative transparent electrodes for organic light emitting diodes
… light source. So far, light emitting diodes (LEDs) and organic LEDs (OLEDs) have been presented as candidates with potentially high efficiency. Recent advances of OLEDs in device architecture, light-out coupling, and materials have ensured high efficiency, exceeding that of incandescent light …
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Emerging solution-processable light-emitting diodes for next-generation data communications
Light-emitting diodes (LEDs) have emerged as a prospective contender that has gained substantial attention for data communications in recent years. This can be attributed to their advantageous characteristics, such as low cost, low power consumption and eye-safe properties. Additionally, high-speed …
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New Carbazole Based Materials for Optoelectronic Applications
… as purity is an important prerequisite for organic materials to be used for optoelectronic applications. Before the new materials were finally tested in transistor devices, a suitable surface treatment of the OFET substrates was developed. By introducing self-assembled monolayers, prepared …
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Surface and interface engineering in quantum dot and double-heterojunction nanorod light-emitting diodes
… next generation displays. State-of-the-art QD-LEDs that utilize CdSe-based spherical core/shell (C/S) QDs as the electroluminescent layer have shown efficiencies and brightness that rival the best organic LEDs. One of the biggest challenges on developing these high performance QD-LEDs is the …
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Incorporating double-heterojunction in anisotropic semiconductor nanocrystals for novel optoelectronic applications
… is display device applications such as LEDs incorporating QDs (QD-LEDs) as the electroluminescent layer. Recent advances in QD-LEDs have led to efficiencies and brightness that rival the best organic LEDs. Nearly ideal internal quantum efficiency being achieved leaves light outcoupling …
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Materials, photophysics and device designs for high efficiency photovoltaics
… a review of the relevant background theory for organic semiconductors, colloidal quantum dot (CQD) semiconductors and perovskite semiconductors, we discuss their applications in inexpensive, solution-processed, optoelectronic devices. We commence by demonstrating the first prototype of a …