Journal
APPLIED PHYSICS LETTERS
Volume 81, Issue 5, Pages 922-924Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1496502
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We demonstrate low-voltage inverted transparent vacuum deposited organic light-emitting diodes employing an indium-tin-oxide coated glass substrate directly as cathode and a semitransparent top Au thin film as anode. The devices comprise an intrinsic 8-tris-hydroxyquinoline aluminum (Alq(3)) emitting layer sandwiched in between n- and p-doped charge transport layer with appropriate blocking layers. They exhibit low driving voltages (similar to4 V for a luminance of similar to100 cd/m2). The devices are about 50% transparent in the Alq(3) emission region and emit green light from both sides with a total external current efficiency of about 2.5 cd/A. (C) 2002 American Institute of Physics.
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