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Keywords:

  • π conjugation;
  • phosphorous heterocycles;
  • optical properties;
  • semiconductors;
  • synthetic methods
Thumbnail image of graphical abstract

A new angle: The insertion of a 2,2′-biphosphole subunit into π-conjugated systems offers a new way to control the HOMO–LUMO gap. Tuning of the dihedral angle (θ) between the two phosphorous heterocycles, either by metal coordination or covalent bonding through the P substitution can lead to control of the band gap. These new π-conjugated systems can be used as emitting materials in white organic light-emitting devices (WOLEDs).