White light emission with LEDs is achieved today by either mixing red, green and blue (RGB) LEDs or by covering monochromatic LEDs with a phosphor layer, though this method decreases the efficiency.<br><br> <strong>Technology</strong><br> This inorganic-organic hybrid LED technology uses electrical excitation in combination with Förster (fluorescent) resonant energy transfer (FRET) between the inorganic and the organic layers. The organic semiconductor can be for example a conjugated polymer based on poly(p-phenylene vinylene) especially MEH-PPV or Poly(thiophene) especially PEDOT. The advantage of this electrically pumped, combined organic-inorganic structure is the strong energetic coupling between the organic and inorganic layers, leading to highly efficient devices. With this combined inorganic-organic LED structure it is possible to achieve higher light yield and therefore a high efficiency white light LED could be fabricated. <br><br>
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