Transient and steady-state behavior of space charges in multilayer organic light-emitting diodes
By B. Ruhstaller, S. Carter, S. Barth, Heike E. Riel, W. Riess, J. Scott. 2001
266 citations recorded by the source corpus.
A numerical study of space charge effects in multilayer organic light-emitting diodes (OLEDs) is presented. The method of solving the coupled Poisson and continuity equations, previously established for single-layer polymer LEDs, has been extended to treat internal organic interfaces. In addition, we consider the transient current and electroluminescence response. We discuss the accumulation of charges at internal interfaces and their signature in the transient response as well as the electric field distribution. Comparison to experimental transient data of a typical bilayer LED based on tris(8-hydroxyquinolinato)aluminum (Alq3) is provided and good agreement is found. Our results are consistent with commonly assumed operating principles of bilayer LEDs. In particular, the assumptions that the electric field is predominantly dropped across the Alq3 layer and that the electroluminescence delay time is determined by electrons passing through Alq3 to the internal interface are self-consistently supported by ...
Subfields: Electrical and Electronic Engineering, Polymers and Plastics
View Paper: https://www.semanticscholar.org/paper/4c6a7f41bb11e2eb5da3009d2289974256dc111e
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Citations in the corpus
- Full-colour quantum dot displays fabricated by transfer printing (2011, background): “This indicates that space-charge formation and the quantum yield of the LED are enhanced by having a well-defined interface between the QD and HTL layer”
- Simulating electronic and optical processes in multilayer organic light-emitting devices (2003, methodology): “The creation of excitons in bilayer OLEDs based on Alq is believed to be strongly confined to the region in the emissive layer near the internal interface with the hole transporting layer [ 2 ], [22].”