Light-emitting electrochemical cell
A light-emitting electrochemical cell (LEC or LEEC) is a solid-state device that generates light from an electric current (electroluminescence). LEC's are usually composed of two metal electrodes connected by (e.g. sandwiching) an organic semiconductor containing mobile ions. Aside from the mobile ions, their structure is very similar to that of an organic light-emitting diode (OLED).
LECs have most of the advantages of OLEDs, as well as additional ones:
- The device does not depend on the difference in work function of the electrodes. Consequently, the electrodes can be made of the same material (e.g., gold). Similarly, the device can still be operated at low voltages.[1][2]
- Recently developed materials such as graphene[3] or a blend of carbon nanotubes and polymers[4] have been used as electrodes, eliminating the need for using indium tin oxide for a transparent electrode.
- The thickness of the active electroluminescent layer is not critical for the device to operate. This means that:
- LECs can be printed[5] with relatively inexpensive printing processes (where control over film thicknesses can be difficult).
- Internal device operation can be observed directly.[6]
While electroluminescence had been seen previously in similar devices, the invention of the polymer LEC is attributed to Pei et al.[7] Since then, numerous research groups and a few companies have worked on improving and commercializing the devices.
In 2012 the first inherently stretchable LEEC using an elastomeric emissive material (at room temperature) was reported. Dispersing an ionic transition metal complex into an elastomeric matrix enables the fabrication of intrinsically stretchable light-emitting devices that possess large emission areas (∼175 mm2) and tolerate linear strains up to 27% and repetitive cycles of 15% strain. This work demonstrates the suitability of this approach to new applications in conformable lighting that require uniform, diffuse light emission over large areas.[8]
In 2012 fabrication of organic light-emitting electrochemical cells (LECs) using a roll-to-roll compatible process under ambient conditions was reported.[9]
See also
- Electrochemical cell
- Electrochemiluminescence
- Light-emitting diode
- Organic light-emitting diode
- Photoelectrolysis
References
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