Light Emitting Diodes (LEDs)
A light-emitting diode (LED) is a semiconductor light source that can emit light when electric current flows through it.
An interesting aspect is the ability to manipulate output from the LED. It can be to shape the light, collimate the light or focus the light. This can be achieved with a single flat DOE.
Another important topic is the efficiency of the LED that enable more light for less energy.
There are several ways to improve light outcoupling efficiency of LEDs using nanostructures. With nanoimprint, one approach is to place the nanostructures on top of the LED, while another way is to make the LED on patterned sapphire substrates (PSS), where nanoimprint is used for cost efficient fabrication of the PSS.
We work with several LED companies and have great experience in making wafer sized NIL stamps or molds with sub-wavelength dot patterns or photonic bandgap structures (PBG). This is used directly in a NIL process for patterning of LEDs or used as masters for making polymer NIL stamps.
LEDs and what we can do
We can provide fully patterned wafer-scale NIL masters with sub-wavelenght features that can be used to create photonic bandgap structures (PBG). This can often be used for patterning of LEDs.