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Keywords:

  • Electroluminescence;
  • Light-emitting diodes, organic;
  • Near-infrared emission

Using a simple non-conjugated polymer host, blends with tetraphenylporphyrin complexes of ytterbium [Yb(TPP)L] have been used to construct near-infrared-emitting diodes in which the Yb(TPP)L serves as both the emitter and charge-transport medium. The Figure shows the structure of Ln(TPP)L(OEt), and a simplified mechanism of light-emitting diode operation.