Electroluminescent device with improved cathode
AssigneeEastman Kodak Company
InventorsSteven A. VanSlyke, Ching W. Tang
Life of this patent
Estimating the term…
Abstract
An internal junction electroluminescent device is disclosed containing, in sequence, an anode, an organic hole injecting and transporting zone, an organic electron injecting and transporting zone forming a junction with the organic hole injecting and transporting zone, and a cathode comprised of a layer contacting the organic electron injecting and transporting zone containing a combination of magnesium and aluminum. Aluminum accounts for at least 80 percent of the cathode layer.
Claims11
An internal junction organic electroluminescent device comprising in sequence, an anode, an organic hole injecting and transporting zone, an organic electron injecting and transporting zone, and a cathode comprised of a layer contacting the organic electron injecting and transporting zone containing a combination of magnesium and at least one metal having a higher work function than magnesium,
- characterized in that the one metal having a higher work function than magnesium is aluminum and accounts for at least 80 percent of the cathode layer.
An internal junction organic electroluminescent device comprising in sequence, an anode, an organic hole injecting and transporting zone, an organic electron injecting and transporting zone forming a junction with the organic hole injecting and transporting zone, and a cathode comprised of a layer contacting the organic electron injecting and transporting zone containing a combination of magnesium and aluminum,
- characterized in that
- said electron injecting and transporting zone is comprised of a vacuum vapor deposited stilbene or chelated oxinoi layer and
- said cathode layer is deposited on said electron injecting and transporting zone layer in a thickness range of from 50 to 5000.ANG. and is comprised of from 0.1 to 10 percent magnesium and at least 90 percent aluminum.
Dependencies are inferred from the claim text.