1. Improving the stability of organic light-emitting devices by using a hole-injection-tunable-anode-buffer-layer.
- Author
-
Luo, Yichun, Aziz, Hany, Xu, Gu, and Popovic, Zoran D.
- Subjects
LIGHT sources ,NAPHTHALENE ,TIN alloys ,ANODES ,ELECTROLUMINESCENT devices - Abstract
Introducing a hole-injection-tunable-anode-buffer-layer (HITABL) at the indium tin oxide anode contact of an organic light-emitting device can finely tune hole injection to establish proper charge balance, thus remarkably improves its operational stability. The HITABL consists of two sublayers: (i) an ∼2.5 nm thick metal (e.g., Ca, Mg, or Ag) sublayer and (ii) an ∼10 nm thick tetrafluorotetracyanoquinodimethane (F
4 TCNQ) doped N′ -di(naphthalene-1-yl)-N,N′ -diphenyl-benzidine sublayer. Hole injection can be tuned by changing (i) the metal in the first sublayer and/or (ii) the concentration of the F4 TCNQ dopant in the second sublayer. The choice of the metal used in the first sublayer and/or the concentration of F4 TCNQ in the second sublayer affect the hole-injection efficiency. Therefore, by using the HITABL, one can make the necessary diminutive adjustments to the hole injection of a device and achieve proper charge balance, resulting in a significant improvement in operational stability. [ABSTRACT FROM AUTHOR]- Published
- 2007
- Full Text
- View/download PDF