Highly Efficient Red-Emission Polymer Phosphorescent Light-Emitting Diodes Based on Two Novel Tris(1-phenylisoquinolinato-C2,N)iridium(III) Derivatives



original image

Tris(2-phenylpyridine) iridium (Ir(ppy)3) derivatives are used to fabricate highly efficient red-emission phosphorescent polymer LEDs. The continuous tuning of the electron current to balance the hole current perfectly, by changing the thickness of the electron-injection layer, is demonstrated. Peak efficiencies of 16.9 cd A–1 and 17.6 lm W–1 are achieved for red emission (see figure).