| 摘要 |
A full colour optical device comprising: an anode; a cathode; a light-emitting region located between the anode and the cathode; characterised in that said light-emitting region comprises subpixels of blue, green and red emitting materials, the blue emitting material being fluorescent and at least one of the green and red emitting materials being phosphorescent, wherein the cathode injects electrons into each subpixel and the cathode comprises: a first layer comprising a compound of a group 1, group 2 or transition metal; and a second layer comprising a material having a work function below 3.5 eV.
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