Microlens Array on Sapphire Substrate Prepared by FIB to Enhance Electroluminescence of GaN/Sapphire Blue LED

Lee, Ming-Kwei; Kuo, Kwei-Kuan

doi:10.1149/1.2364304

Electrochem. Solid-State Lett.

2007

DOI: 10.1149/1.2364304

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Microlens Array on Sapphire Substrate Prepared by FIB to Enhance Electroluminescence of GaN/Sapphire Blue LED

Ming-Kwei Lee¹,

Kwei-Kuan Kuo²

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Cited by 8 publications

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“…Microlens arrays with different diameters, aspect ratios, and areal coverages have shown improved out-coupling efficiency by 1.5–2 fold for both LEDs and OLEDs . The microlenses on LEDs are generally formed by an etching process, , while the transparent polymer microlens arrays are typically employed for OLEDs (see Figure a). The refractive indices of polymers, such as polydimethylsiloxane (PDMS), poly(methyl methacrylate) (PMMA), and polyurethane (PU), ,, are relatively close to those of the substrates.…”

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Light Management with Nanostructures for Optoelectronic Devices

Leung

Zhang

Xiu

et al. 2014

J. Phys. Chem. Lett.

165

115

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Light management is of paramount importance to improve the performance of optoelectronic devices including photodetectors, solar cells, and light-emitting diodes. Extensive studies have shown that the efficiency of these optoelectronic devices largely depends on the device structural design. In the case of solar cells, threedimensional (3-D) nanostructures can remarkably improve device energy conversion efficiency via various light-trapping mechanisms, and a number of nanostructures were fabricated and exhibited tremendous potential for highly efficient photovoltaics. Meanwhile, these optical absorption enhancement schemes can benefit photodetectors by achieving higher quantum efficiency and photon extraction efficiency. On the other hand, low extraction efficiency of a photon from the emissive layer to outside often puts a constraint on the external quantum efficiency (EQE) of LEDs. In this regard, different designs of device configuration based on nanostructured materials such as nanoparticles and nanotextures were developed to improve the out-coupling efficiency of photons in LEDs under various frameworks such as waveguides, plasmonic theory, and so forth. In this Perspective, we aim to provide a comprehensive review of the recent progress of research on various light management nanostructures and their potency to improve performance of optoelectronic devices including photodetectors, solar cells, and LEDs. O ptoelectronic devices, such as photodetectors, solar cells, and light-emitting diodes (LEDs), are essentially light to electricity or vice versa energy conversion devices. Utilization of efficient optoelectronic devices cannot only produce clean energy but can also help with energy conservation. Recent extensive studies have shown that the efficiency of these optoelectronic devices largely depends on the device structural design. In the case of solar cells, which involve conversion from solar radiation to electricity, it has been discovered that nanostructures can remarkably improve the energy conversion efficiency via various light-trapping mechanisms. Therefore, a number of nanostructures including nanowires, nanopillars, nanoholes, and so forth were fabricated, and their effectiveness for photovoltaic (PV) performance improvement has been examined based on different material systems. Meanwhile, these optical absorption enhancement schemes can benefit photodetectors as well. It is worth pointing out that due to the different application scale requirement, low-cost approaches are desired for effective light management in PV applications. However, performance is the primary concern for photodetectors in most circumstances. On the other hand, a LED is a device that converts electrical energy to optical radiation. High quantum efficiency and photon extraction efficiency not only help energy conservation but also minimize the overheating of the device, thus prolonging its lifetime. In recent decades, numerous material systems and techniques were extensively studied to improve the internal quantum ...

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mentioning

confidence: 99%

Light Management with Nanostructures for Optoelectronic Devices

Leung

Zhang

Xiu

et al. 2014

J. Phys. Chem. Lett.

165

115

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Characterization and simulation of sputtering etched profile by focused gallium ion beam on GaN substrate

et al. 2022

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Study and formation of 2D microstructures of sapphire by focused ion beam milling

Taguchi

Kang

Bei

et al. 2008

Microelectronic Engineering

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Microlens Array on Sapphire Substrate Prepared by FIB to Enhance Electroluminescence of GaN/Sapphire Blue LED

Cited by 8 publications

References 8 publications

Light Management with Nanostructures for Optoelectronic Devices

Light Management with Nanostructures for Optoelectronic Devices

Characterization and simulation of sputtering etched profile by focused gallium ion beam on GaN substrate

Study and formation of 2D microstructures of sapphire by focused ion beam milling

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