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Three primary colors LEDs with a high directional radiation beam profile will be effectively utilized for projection type LED displays. In this light, we notice that InGaN-based nanocolumn LEDs exhibit excellent innate qualities of RGB emission control by the structural parameter of nanocolumn 1, 2), as well as directional radiation property3). GaN nanocolumns were self-assembled by rf-plasma molecular...
We report a significant improvement in the electrical characteristic of compositionally graded InGaN/GaN multiple-quantum-well (MQWs) micro-LED. The efficiency droop in this device occurred at ∼20 times higher injection levels (∼275 A/cm2) compared to a conventional step-MQWs microLED (∼14 A/cm2).
When the emission spectrum of the powder state is adopted, the simulated optical properties show a remarkable discrepancy from those of the fabricated LED package. We suggest that the discrepancy originates from the absorption of Stokes shifted light by a phosphor.
There has been rapid technical progress in Visible Light Communications (VLC) over the last decade. A consortium of UK universities (Strathclyde, Oxford, Cambridge, St. Andrews, Edinburgh) has been investigating the use of microLEDs for VLC. This paper focuses on improvements to transmitter and receiver that can increase data rate and link margin.
This paper investigates the feasibility of moderate data rate visible light communication using commercial RGB-LEDs as both emitters and detectors. Data rates of 155 Mb/s (uni-directional) and 110 Mb/s (aggregate bi-directional) were demonstrated.
We fabricated optical devices containing sub-micron cylindrical structures. Most stray light is reduced by using a shielding film. Therefore, we can obtain a principal axis with a large deflection angle and sharply defined shape.
Combining quantum well intermixing and multiple die bonding a broadband superluminescent III-V on silicon LED was realized. Balancing four LEDs with different band gaps resulted in 292nm 3dB bandwidth and an on-chip power of −8dBm.
Hybrid sources consisting of 450nm InGaN LEDs with capillary-bonded micron-thick multi-quantum-well color-converting membranes are reported. Such sources are attractive for visible light communications and a 540nm-emitting hybrid LED having a 57MHz modulation bandwidth is demonstrated.
The integration of arrays of 486nm-emitting micron-size LEDs onto non-native substrates (including diamond, ultra-thin glass and MQW epitaxial structures) is demonstrated. The device bonding process relies solely on solvent-assisted capillary adhesion, and precision assembly through transfer printing.
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