Transparent hole-transport layer triples UVC LED light output

June 13, 2018 // By Julien Happich
Startup Bolb Inc. has announced a new line of ultraviolet c-band light-emitting diodes (UVC LED) featuring record single-chip performance for universal disinfection. With its UVC LEDs, the company claims it has achieved an external quantum efficiency (EQE) of 12.2% thanks to a proprietary UVC transparent hole-supplying layer.

Until now, the light-absorbing hole-supplier layer typically designed in UVC LEDs significantly degraded current-voltage performance, increasing heat generation and adversely affecting device lifetimes.

Bolb Inc.’s new LEDs built using the UVC-transparent hole-supplying layer do not suffer voltage tradeoff and allows the packaged LEDs to simultaneously achieve 12.2% EQE and 9.5% wall-plug efficiency (WPE).  

This means that a single 0.5x0.25mm LED driven at a 20mA forward current will deliver 10 to 11mW of UVC power at an optimized disinfection wavelength of 265 to 275nm, while maintaining a 5.8V forward voltage.

This is a single chip performance 3 to 5 times that of competitors’ offerings at similar wavelengths, claims the company.

Bolb Inc. -

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