Micro LED Arrays
The Institute of Photonics has developed and demonstrated a range of microLED arrays in various formats, all based on GaN growth on a sapphire substrate. These devices typically range from 64 x 64 element arrays up to 128 x 96 element devices. In addition to different array formats, devices at various output wavelengths have been produced; so far this includes the Ultraviolet, blue and green. The LED elements are typically 20 microns in diameter on a 30 micron pitch, but this is not a limit. The size of the array is extremely small; for example the 64 x 64 array is about 2.3 x 2.3 mm square. A matrix-addressing scheme allows the emitters to be addressed individually and, in this format they have produced 10’s of micro-Watts per element, although their maximum output power potential has yet to be fully evaluated. In addition, the sapphire substrate can be etched so that microlenses are produced, aligned with each microLED emitter, so that the beam from each emitter can be focussed by its own microlens.
The Institute is one of only a handful of groups world-wide who are working on GaN micro-arrays and their current devices are, as far as is known, the highest overall performance microarrays yet demonstrated.
Key Benefits
- Compact
- High Efficiency
- Good Beam Quality
- Fast Operating Speeds
Applications
- Display devices
- Board to board communications
- Optical biochips for chemical and biological sensing
- Advanced microscopy
IP Status
A patent application on the underlying enabling technology has been granted. Contact is welcomed from organisations interested in developing, licensing or exploiting this technology with a view to commercialisation.
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