LEC Theory

The LEC’s Basic Function


The LEC only needs one active layer (AL) positioned between two electrodes in a “sandwich structure”. Both electrodes and the AL can be deposited from solution in ambient condition

The active layer is a blend of active components dissolved in solvents, which solvents are optimized for different deposition techniques. The active components in the active layer are:

 (i) Fluorescent and semiconducting “conjugated polymer”
ConjPoly Ink bottles

Coloured ink before deposition


(ii) Electrolyte (dissolved salt)





In-situ doping provides several opportunities for the LEC-technology

  (i) The recombination of electrons and holes in LunaLEC’s devices is very efficient, which leads to only a small need for over-potential to drive the light-emission
>>> Low turn-on voltage, i.e. 3-6 VDC for all emission colors
 (ii) The work function of the electrodes is not critical for the injection of electrons and holes. As opposed to other lighting technologies, LEC devices can utilize air-stable electrodes for both cathode and anode
>>> No need for clean room or vacuum to deposit electrodes 
>>> Possibilities to use electrodes from solution
(iii) The doping layers will self-adjust to a common distance between n-front and p-front throughout the device regardless of the variations of thickness of the active layer.
>>> Printing methods with uneven deposition can be utilized
(iv) With triplet harvesting most of the energy most of the energy supplied is used in the efficient recombination of electrons and holes  
>>>  Prerequisites for energy-efficient operation