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 9 of 9 for “"efficiency droop"”.
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Efficiency droop mitigation and quantum efficiency enhancement for nitride Light-Emitting Diodes
… state-of-the art InGaN-based LEDs, including ‘efficiency droop’ issues that cause output power quenching at high current injection levels (> 100 A/cm2). In this dissertation, approaches were investigated to address the major issues related to state-of-the-art nitride LEDs, in particular related …
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Theoretical exploration of efficiency droop mechanisms in III-nitride visible light-emitting diodes
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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A study of efficiency droop of green light emitting diodes grown by metalorganic chemical vapor deposition
… Materials and Devices Group) to reduce the "efficiency droop" effect that occurs in III-Nitrides Light Emitting Diodes (LEDs) when driven at high injection current densities. The efficiency droop refers to a decrease of the LED light emission efficiency when increases the current density from …
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Nanoscale optoelectronic properties in traditional and emerging materials for light-emitting diodes
… diodes (LEDs), these devices suffer from efficiency droop at high current densities and material quality degradation at longer emission wavelengths. Establishing rational process design principles to address such issues remains inhibited by ongoing controversy surrounding the impact of …
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Less strain, more gain_nano_patterning III-N thin films
… increased light extraction, increased device efficiency, reduction of efficiency droop, and reduction in crystallographic defect density. High defect densities that normally plague III-N materials and reduce the device efficiency are not an issue for nano-structured devices such as LEDs, due …
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Growth, processing and chracterization of gallium nitride based coaxial LEDs grown by MOVPE
… (QCSE) and improve the radiative recombination efficiency of LEDs. The recent evolution of a catalyst free, scalable, repeatable and industrially viable device quality GaN nanowire and nanowall metal organic vapor phase epitaxy (MOVPE) growth process has enhanced the possibility of these LEDs …
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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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White Light Endoscopy for Minimal Invasive Surgery
… unwanted characteristics with lower cost, higher efficiency and more environmentally friendly solid state devices to improve the benefits of endoscopic minimal invasive surgery even further.<br/><br/>Instruments used in the procedures are small for use in restrictive spaces, the investigation …
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Surface and interface engineering in quantum dot and double-heterojunction nanorod light-emitting diodes
… (i.e., only one to a few hundred cd/m2) and the efficiency droop leads to less-than ideal performance at high luminance conditions useful for many applications. External quantum efficiency (EQE) at luminance levels relevant for high-end displays and general lighting (~1,000 and ~5,000 cd/m2, …