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Three-Color Passive-Matrix Pixels Using Dye-Diffusion-Patterned Tri-Layer Polymer-Based LED

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Abstract

Dry dye-printing and solvent-enhanced dye diffusion were used to locally dope a previously spin-coated poly(9-vinylcarbazole) (PVK) polymer film with different dyes to fabricate side-by-side RGB OLED pixels. To reduce reverse leakage current and raise efficiency, a blanket tris-8-hydroxyquinoline aluminum (Alq) electron transport layer (ETL) was deposited over the polymer layer after the dye diffusion step, along with a 2, 9-dimethyl-4, 7-diphenyl-1, 10-phenanthroline (BCP) hole/exciton blocking layer between the Alq and the PVK to ensure all light emission occurred from the doped polymer and not from the Alq. Devices with this tri-layer structure have an extremely low reverse leakage current (rectification ratio of 106 at +/- 10V) and a higher external quantum efficiency (∼1%) than single layer devices. A three-color passive-matrix test array with 300μm x 1mm RGB subpixels was demonstrated with this structure.

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Authors and Affiliations

  1. Center for Photonics and Optoelectronic Materials (POEM), Department of Electrical Engineering, Princeton University, Princeton, New Jersey, 08544, USA

    Ke Long, Florian Pschenitzka & J. C. Sturm

Authors
  1. Ke Long
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  2. Florian Pschenitzka
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  3. J. C. Sturm
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Long, K., Pschenitzka, F. & Sturm, J.C. Three-Color Passive-Matrix Pixels Using Dye-Diffusion-Patterned Tri-Layer Polymer-Based LED. MRS Online Proceedings Library 708, 68 (2001). https://doi.org/10.1557/PROC-708-BB6.8

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  • DOI: https://doi.org/10.1557/PROC-708-BB6.8

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