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  , Organic Light Emitting Diodes (OLEDs)
    An OLED(Organic Light Emitting Diode) is a light-emitting diode which consists of semiconducting organic layers
stacked between two electrodes. When the voltage is applied to the electrodes, electrons move from the cathode
and holes move from the anode through the organic layers. Electrostatic forces bring the electrons and the holes
towards each other and they recombine forming electron-hole pair called exciton in the emissive layer. The decay
of this excited state results in a relaxation of the energy levels of the electron, accompanied by emission of
radiation with a frequency given by the energy gap between the HOMO and LUMO levels of the emitting molecules.
  - OLED advantages
  - OLED applications
    OLEDs have been applied to general displays like TVs, mobile phones and lighting. Since OLED displays work without
backlight unit, it can further be utilized in various applications for future displays such as flexible, wearable and
transparent displays.
  - White Organic Light-emitting Diodes
    White organic light emitting diodes (WOLEDs) have been studied with a great deal of attention because of their
wide range of potential applications including light sources for full color displays and solid state lighting. WOLEDs
can be fabricated with various device structures such as a devices with single EML or single device stack using multiple
EML doped by several dyes or tandem structure which was connected in series with charge generation unit.
  - Novel Strategy to Reduce Patterning Step
    We demonstrated full-color (RGB) phosphorescent OLEDs by using a common red dye-doped layer in HTL, which
can simplify the conventional fabrication process. Common red layer (CRL) open up the possibility of simplified
fabrication of practical full-color OLED displays with the reduced fine metal mask (FMM) steps, resulting in lower
manufacturing cost.
  - Solution-processed Devices
    Polymer-light emitting diodes (PLEDs) have been provided for their potential applications to large-area
full-color displays and solid-state lightings based on solution process. PLEDs having enhanced performances and
stability were successfully fabricated and demonstrated by using the mixture of MoO3 powder and PEDOT:PSS.
  - Orthogonal Process for Patterning
    Orthogonal photolithography have been attracted to stack several layers vertically, which pursues the combination
of industry standard high-resolution photopatterning.
    Highly fluorinated photoreactive polymers were designed using a photodimerization chemistry of antracene moieties.
FSIM-2 and fluorous solvents were applied to the photolithographic patterning of OLED pixels.
  - Flexible OLEDs

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