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High Modulation Bandwidth of Semipolar (11-22) InGaN/GaN LEDs with Long Wavelength Emission.

Jack Ih Haggar¹, Yuefei Cai¹, Suneal S Ghataora¹

¹Department of Electronic and Electrical Engineering, The University of Sheffield, Sheffield S1 3JD, United Kingdom.

ACS Applied Electronic Materials

|September 9, 2020

Summary

This summary is machine-generated.

Semipolar III-nitride LEDs achieve record modulation bandwidths for visible light communication and general illumination. These advancements overcome c-plane limitations, enabling high-efficiency green, yellow, and amber light-emitting diodes.

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Area of Science:

Solid State Physics
Optoelectronics
Materials Science

Background:

Visible light communication (VLC) demands III-nitride light-emitting diodes (LEDs) with high modulation bandwidth, currently limited by c-plane growth.
Efficient green and yellow III-nitride LEDs for general illumination are challenging to produce on c-plane substrates.
Micro-LEDs offer high modulation bandwidth but suffer from low efficiency.

Purpose of the Study:

To demonstrate record modulation bandwidths in semipolar III-nitride LEDs.
To overcome the limitations of c-plane substrates for high-performance LEDs.
To explore the potential of semipolar LEDs for both VLC and general illumination applications.

Main Methods:

Fabrication and characterization of broad-area semipolar green, yellow, and amber III-nitride LEDs.
Measurement of modulation bandwidths for the fabricated LEDs.
Differential carrier lifetime measurements to correlate with modulation performance.

Main Results:

Achieved a record modulation bandwidth of 540 MHz for semipolar green LEDs.
Reported modulation bandwidths of 350 MHz for semipolar yellow LEDs and 140 MHz for semipolar amber LEDs.
Demonstrated the longest wavelength III-nitride LEDs to date, with results consistent with carrier lifetime measurements.

Conclusions:

Semipolar III-nitride LEDs offer a viable solution to achieve high modulation bandwidths, overcoming c-plane limitations.
These findings pave the way for efficient green/yellow LEDs for general illumination and high-speed VLC.
The demonstrated performance highlights the potential of semipolar growth for advanced optoelectronic devices.