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Local Field Fluorescence Microscopy: Imaging Cellular Signals in Intact Hearts

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Variable-color light-emitting diodes using GaN microdonut arrays.

Youngbin Tchoe¹, Janghyun Jo, Miyoung Kim

¹Department of Physics and Astronomy, Seoul National University, Seoul, 151-747, Korea.

Advanced Materials (Deerfield Beach, Fla.)

|March 29, 2014

Summary

This summary is machine-generated.

Researchers created microdonut-shaped gallium nitride (GaN) and indium gallium nitride (InxGa1-xN) light-emitting diode (LED) microarrays. These LEDs emit spatially-resolved blue and green light, tunable by voltage or size, for variable-color emission.

Keywords:

and indium gallium nitride light-emitting diodes multicolor nanostructure quantum well

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Area of Science:

Solid State Physics
Materials Science
Optoelectronics

Background:

Gallium nitride (GaN) and related alloys are crucial for optoelectronic devices.
Developing tunable, multi-color light-emitting diodes (LEDs) is essential for advanced display and lighting technologies.

Purpose of the Study:

To fabricate microdonut-shaped GaN/InxGa1-xN LED microarrays.
To investigate the potential of these microstructures as variable-color emitters.

Main Methods:

Fabrication of microdonut-shaped GaN/InxGa1-xN LED microarrays.
Characterization of light emission properties, including electroluminescence (EL).

Main Results:

Successful fabrication of microdonut LEDs exhibiting distinct donut-shaped light emission.
Demonstration of spatially-resolved blue and green electroluminescence (EL) colors.
Tunability of emission color by adjusting external bias voltage or microdonut size.

Conclusions:

Microdonut-shaped GaN/InxGa1-xN LEDs offer a promising platform for tunable, multi-color light emission.
The ability to control color via voltage or size opens possibilities for advanced lighting and display applications.