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Title: Negative differential resistance phenomena in colloidal quantum dots-based organic light-emitting diodes

The influence of ligands on the electrical behavior of CdSe/ZnS core-shell colloidal quantum dots (CQDs)-based organic light-emitting diodes is presented. Negative differential resistance (NDR) phenomena at room temperature are observed from single-layer device ITO/poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS)/CQDs/Al in which the original capping ligand tri-n-octylphosphine oxide (TOPO) of CQDs is exchanged with oleylamine, as well as in both bilayer device ITO/PEDOT:PSS/CQDs/BCP(10 nm)/Al and trilayer device ITO/PEDOT:PSS/CQDs/BCP(10 nm)/Alq{sub 3}(10 nm)/Al. However, such a kind of NDR phenomenon disappears if TOPO is exchanged with hexadecylamine. Therefore, NDR phenomenon depends greatly on the ligands of the CQDs, and the origin of NDR from these devices is discussed.
Authors:
; ; ;  [1] ; ;  [2] ;  [3]
  1. Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Center for Micro and Nano Technology, School of Physics, Beijing Institute of Technology, Beijing 100081 (China)
  2. Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Optoelectronics, Beijing Institute of Technology, Beijing 100081 (China)
  3. Wuhan Jiayuan Quantum Dots Co. Ltd., Wuhan 430075, Hubei Province (China)
Publication Date:
OSTI Identifier:
22280628
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CADMIUM SELENIDES; COLLOIDS; ELECTRIC CONDUCTIVITY; HETEROJUNCTIONS; LAYERS; LIGANDS; LIGHT EMITTING DIODES; QUANTUM DOTS; TEMPERATURE RANGE 0273-0400 K; TRIOCTYLPHOSPHINE OXIDE; ZINC SULFIDES