| abstract |
A display device including an anode, a cathode, and a region of an organic electroluminescent material located between the anode and the cathode, wherein the organic electroluminescent material is a blue-light emitter, and the cathode includes a first layer and a second layer located between the first layer and the organic electroluminescent material, the first layer containing aluminum and the second layer containing at least one of sodium fluoride and potassium fluoride. |