Electronic and excitonic processes in light-emitting devices based on organic materials and colloidal quantum dots

  title={Electronic and excitonic processes in light-emitting devices based on organic materials and colloidal quantum dots},
  author={Polina Anikeeva and Conor F. Madigan and Jonathan E. Halpert and Moungi G. Bawendi and Vladimir Bulovi{\'c}},
  journal={Physical Review B},
We investigate the mechanism of operation of hybrid organic/colloidal quantum dot light emitting devices QD-LEDs. Novel quantum dot QD deposition methods allow us to change the location of an emissive QD monolayer within a QD-LED multilayer structure. We find that the quantum efficiency of devices improves by 50% upon imbedding QD monolayers into the hole transporting layer 10 nm away from the interface between hole and electron transporting layers. We consider two possible mechanisms… Expand

Figures from this paper

Exciton Dynamics in Colloidal Quantum-Dot LEDs under Active Device Operations
Colloidal quantum-dot light-emitting diodes (QLEDs) are lucrative options for color-pure lighting sources. To achieve high-performance QLEDs, besides developing high-efficiency quantum dots (QDs), itExpand
Origins of Low Quantum Efficiencies in Quantum Dot LEDs
The promise for next generation light-emitting device (LED) technologies is a major driver for research on nanocrystal quantum dots (QDs). The low efficiencies of current QD-LEDs are often attributedExpand
Comparing direct charge injection and Forster energy transfer into quantum dots in hybrid organic/inorganic quantum dot light emitting devices
Inorganic quantum dots (QDs) have excellent optoelectronic properties. But, due in part to a lack of a suitable medium for dispersion, they have not been extensively used in optoelectronic devices.Expand
Enhancing Quantum Dot LED Efficiency by Tuning Electron Mobility in the ZnO Electron Transport Layer
Quantum-dot (QD) light-emitting diodes (QLEDs) are an important new class of optoelectronic device. Despite the ubiquity of ZnO as the electron-transport material in QLEDs, little is known about howExpand
Design, Fabrication, and Characterization of All-Inorganic Quantum Dot Light Emitting Diodes
Quantum dot light emitting diodes are investigated as a replacement to the existing organic light emitting diodes that are commonly used for thin film lighting and display applications. In this,Expand
Efficient quantum dot light-emitting diodes by controlling the carrier accumulation and exciton formation.
The performances and spectroscopic properties of CdSe/ZnS quantum dot light-emitting diodes (QD-LEDs) with inserting a thickness-varied 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBi) layerExpand
Enhanced performances of quantum dot light-emitting diodes with doped emitting layers by manipulating the charge carrier balance
High performance quantum dot light-emitting diodes (QD-LEDs) have been realized by doping quantum dots into a polymer matrix as an emitting layer (EML). Efficient energy transfer from the matrix toExpand
Fabrication and optimization of light emitting devices with core-shell quantum dots
Quantum dot light emitting devices (QD-LEDs) are promising options for the next generation of solid state lighting, color displays, and other optoelectronic applications. Overcoating quantum dotsExpand
Quantum dot light-emitting diode with quantum dots inside the hole transporting layers.
We report a hybrid, quantum dot (QD)-based, organic light-emitting diode architecture using a noninverted structure with the QDs sandwiched between hole transporting layers (HTLs) outperforming theExpand
Efficiency loss mechanisms in colloidal quantum-dot light-emitting diodes
This thesis identifies the origin of reduced efficiencies at high current density operation, known as the efficiency roll-off, and attributes the strength of the bi-exponential behavior to the fraction of the QDs charged in the device, which can explain the correlation between thestrength of theBi-exp exponential behavior and the EQE. Expand


  • R. Rosenfeld
  • Medicine
  • Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery
  • 2009
I am writing with a simple plea to balance the voluminous articles about treatment in your journal with a modicum of information about nature and caring effects to rekindle the perception of physicians as healers, not only treaters, who relish the gifts of nature, and foster the humanistic aspect of medicine that has thrived for millennia. Expand
͑2005͒. 24 A. Rose
  • ͑2005͒. 24 A. Rose
  • 1538
Adv. Funct. Mater
  • Adv. Funct. Mater
Adv. Mater. ͑Weinheim , Ger
  • Adv. Mater. ͑Weinheim , Ger
Adv. Mater. ͑Weinheim, Ger.͒
  • Adv. Mater. ͑Weinheim, Ger.͒
Ann. Phys. J. Chem. Phys
  • Ann. Phys. J. Chem. Phys
Annu. Rev. Mater. Sci
  • Annu. Rev. Mater. Sci
Appl. Phys. Lett
  • Appl. Phys. Lett
Appl. Phys. Lett
  • Appl. Phys. Lett
Appl. Phys. Lett
  • Appl. Phys. Lett