Patent ID: 6784602
Filing Date: 2004-08-31
Classification: H01L,Y10S

Abstract:
An electroluminescent device for displaying an image to a viewer in front of said device, comprising:an anode layer, being said front and being substantially transparent to electroluminescent light; a cathode layer being reflective to ambient light; an organic electroluminescent layer made from tris(8-quinolinolato aluminium) (Alq3) and disposed between said cathode layer and said anode layer, said electroluminescent layer having a highest occupied molecular orbital associated with an anode side, and a lowest unoccupied molecular orbital associated with a cathode side; and a semi-absorbent layer and a transparent layer together forming an optical interference member that is disposed between said electroluminescent layer and said cathode, said semi-absorbing layer being closer to said electroluminescent layer than said transparent layer, said member having a work function (&PHgr;OIM) about equal to an amount of energy required to extract an electron from said lowest unoccupied molecular orbital (ELUMO), said member causing at least some destructive optical interference of ambient light at a pre-selected wavelength to reduce reflectance of ambient light towards said viewer.