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Partially pyridine-functionalized quantum dots for efficient red, green, and blue light-emitting diodes

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Abstract

Surface-exchanged, partially pyridine-functionalized colloidal quantum dot-based light-emitting diodes (QD-LEDs) that exhibit a low turn-on voltage and high brightness are reported. Pyridine is stochastically exchanged to a greater extent at the interface between the QDs and the hole transport layer via ligand exchange. Pyridine improves the charge balance within the QDs by enhancing the hole injection and hence lowers the turn-on voltage of the QD-LEDs. This strategy is applied to red-, green-, and blue-emitting (three primary colors) QD-LEDs. Pyridine-functionalized QD-LEDs (QD/py-LEDs) show enhanced maximum luminance, lowered driving voltages, and improved current- and power-efficiencies as compared with the original surface ligand-functionalized QD-LEDs. All three types of QD/py-LEDs show narrow emission spectra (full width at half maximum <40 nm) and cover 159% of the National Television System Committee 1987 color gamut.

Graphical abstract: Partially pyridine-functionalized quantum dots for efficient red, green, and blue light-emitting diodes

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Publication details

The article was received on 03 Sep 2018, accepted on 22 Jan 2019 and first published on 24 Jan 2019


Article type: Communication
DOI: 10.1039/C8TC04414G
Citation: J. Mater. Chem. C, 2019, Advance Article

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    Partially pyridine-functionalized quantum dots for efficient red, green, and blue light-emitting diodes

    S. Choi, J. Moon, H. Cho, B. Kwon, N. S. Cho and H. Lee, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C8TC04414G

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