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Keywords:

  • blue phosphorescence;
  • organic light-emitting diodes;
  • phenylimidazole ligands;
  • high external quantum efficiency;
  • high power efficiency;
  • low driving voltages
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A homoleptic iridium (iii) tris(pheny­limidazolinate) complex realizes a high EQE of 30%, a low turn-on voltage of 2.5 V, and a small efficiency roll-off in a blue organic light-emitting device (OLED). This device also shows high power efficiencies over 75 lm W−1 and an ideal light distribution pattern at 100 cd m−2.