Light-Emitting Diodes with Voltage-Switchable Colors from Semiconducting Polymer/Polymer Heterojunctions

Abstract

Reversible electroluminescence color changes with applied voltage have been observed in light-emitting diodes fabricated from semiconducting polymer heterojunctions consisting of an electron transporting polybenzobisthiazole and hole transporting poly(p-phenylene-vinylene) when layer thicknesses are less than 60-100 nm. Enhanced device performances such as lower turn-on voltage and higher efficiency and luminance were also obtained compared to single-layer devices. The observed voltage-switchable emission colors in these nanoscale heterojunction light sources can be understood in terms of spatial confinement effects which are related to field-dependent charge transport and trapping processes in the materials. These results also demonstrate the use of new high temperature rigid-rod polymers as electron transport and emissive layers in electroluminescent devices.

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Document Details

Document Type
Technical Report
Publication Date
Nov 16, 1998
Accession Number
ADA356298

Entities

People

  • Samson A. Jenekhe
  • Xuejun Zhang

Organizations

  • University of Rochester

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Charge Carriers
  • Chemical Engineering
  • Chemistry
  • Diodes
  • Efficiency
  • Electric Fields
  • Electrons
  • Films
  • Heterojunctions
  • High Temperature
  • Light Emitting Diodes
  • Luminance
  • Materials
  • Polymers
  • Quantum Efficiency
  • Rigid Rod Polymers
  • Rod Polymers

Fields of Study

  • Materials science

Readers

  • Polymer Science and Technology
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Solar Photovoltaics and Thermoelectric Devices.

Technology Areas

  • Microelectronics