Improved performance from multilayer quantum dot light-emitting diodes via thermal annealing of the quantum dot layer

Yu Hua Niu; Andrea M. Munro; Yen Ju Cheng; Yanqing Tian; Michelle S. Liu; Jialong Zhao; Julie A. Bardecker; Ilan Jen-La Plante; David S. Ginger; Alex K.Y. Jen

doi:10.1002/adma.200602373

Improved performance from multilayer quantum dot light-emitting diodes via thermal annealing of the quantum dot layer

Yu Hua Niu, Andrea M. Munro, Yen Ju Cheng, Yanqing Tian, Michelle S. Liu, Jialong Zhao, Julie A. Bardecker, Ilan Jen-La Plante, David S. Ginger, Alex K.Y. Jen

Research output: Contribution to journal › Article › peer-review

146 Scopus citations

Abstract

The improvement in Quantum Dots (QD)-LED performance through improved polymer hole-injection layer (HIL)/hole-transport layer (HTL) structure and thermal annealing of the QD layer before the deposition of organic electron-transport layer was described. The polymer films were annealed for 15 minutes at different temperatures and the device was fabricated by evaporating electron-transporting small molecule to act as a cathode. The results show that the optimum annealing temperatures for the QD-LEDs correspond to 180°C and show improved spectral purity and enhanced enhanced efficiency after annealing. The decreased turn on voltage results from an increase in the current voltage showing that electrical transport through the polymer film is improved by annealing. Ligand desorption is found to improve charge injection and energy transfer from the organic semiconductors to the QDs by decreasing the thickness of the insulating surfactant shell surrounding each QD.

Original language	English
Pages (from-to)	3371-3376
Number of pages	6
Journal	Advanced Materials
Volume	19
Issue number	20
DOIs	https://doi.org/10.1002/adma.200602373
State	Published - 19 Oct 2007
Externally published	Yes

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1002/adma.200602373

Cite this

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title = "Improved performance from multilayer quantum dot light-emitting diodes via thermal annealing of the quantum dot layer",

abstract = "The improvement in Quantum Dots (QD)-LED performance through improved polymer hole-injection layer (HIL)/hole-transport layer (HTL) structure and thermal annealing of the QD layer before the deposition of organic electron-transport layer was described. The polymer films were annealed for 15 minutes at different temperatures and the device was fabricated by evaporating electron-transporting small molecule to act as a cathode. The results show that the optimum annealing temperatures for the QD-LEDs correspond to 180°C and show improved spectral purity and enhanced enhanced efficiency after annealing. The decreased turn on voltage results from an increase in the current voltage showing that electrical transport through the polymer film is improved by annealing. Ligand desorption is found to improve charge injection and energy transfer from the organic semiconductors to the QDs by decreasing the thickness of the insulating surfactant shell surrounding each QD.",

author = "Niu, {Yu Hua} and Munro, {Andrea M.} and Cheng, {Yen Ju} and Yanqing Tian and Liu, {Michelle S.} and Jialong Zhao and Bardecker, {Julie A.} and {Jen-La Plante}, Ilan and Ginger, {David S.} and Jen, {Alex K.Y.}",

year = "2007",

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doi = "10.1002/adma.200602373",

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T1 - Improved performance from multilayer quantum dot light-emitting diodes via thermal annealing of the quantum dot layer

AU - Niu, Yu Hua

AU - Munro, Andrea M.

AU - Cheng, Yen Ju

AU - Tian, Yanqing

AU - Liu, Michelle S.

AU - Zhao, Jialong

AU - Bardecker, Julie A.

AU - Jen-La Plante, Ilan

AU - Ginger, David S.

AU - Jen, Alex K.Y.

PY - 2007/10/19

Y1 - 2007/10/19

N2 - The improvement in Quantum Dots (QD)-LED performance through improved polymer hole-injection layer (HIL)/hole-transport layer (HTL) structure and thermal annealing of the QD layer before the deposition of organic electron-transport layer was described. The polymer films were annealed for 15 minutes at different temperatures and the device was fabricated by evaporating electron-transporting small molecule to act as a cathode. The results show that the optimum annealing temperatures for the QD-LEDs correspond to 180°C and show improved spectral purity and enhanced enhanced efficiency after annealing. The decreased turn on voltage results from an increase in the current voltage showing that electrical transport through the polymer film is improved by annealing. Ligand desorption is found to improve charge injection and energy transfer from the organic semiconductors to the QDs by decreasing the thickness of the insulating surfactant shell surrounding each QD.

AB - The improvement in Quantum Dots (QD)-LED performance through improved polymer hole-injection layer (HIL)/hole-transport layer (HTL) structure and thermal annealing of the QD layer before the deposition of organic electron-transport layer was described. The polymer films were annealed for 15 minutes at different temperatures and the device was fabricated by evaporating electron-transporting small molecule to act as a cathode. The results show that the optimum annealing temperatures for the QD-LEDs correspond to 180°C and show improved spectral purity and enhanced enhanced efficiency after annealing. The decreased turn on voltage results from an increase in the current voltage showing that electrical transport through the polymer film is improved by annealing. Ligand desorption is found to improve charge injection and energy transfer from the organic semiconductors to the QDs by decreasing the thickness of the insulating surfactant shell surrounding each QD.

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Improved performance from multilayer quantum dot light-emitting diodes via thermal annealing of the quantum dot layer

Abstract

ASJC Scopus subject areas

UN SDGs

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