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Journal Article Partially Pyridine-functionalized Quantum Dots for Efficient Red, Green, and Blue Light-emitting Diodes
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Authors
Sukyung Choi, Jaehyun Moon, Hyunsu Cho, Byoung-Hwa Kwon, Nam Sung Cho, Hyunkoo Lee
Issue Date
2019-03
Citation
Journal of Materials Chemistry C, v.7, no.12, pp.3429-3435
ISSN
2050-7526
Publisher
Royal Society of Chemistry (RSC)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1039/c8tc04414g
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.
KSP Keywords
40 nm, Blue light-emitting diodes, Colloidal quantum dot(CQD), Emission spectra, Full width at half maximum(FWHM), High brightness, Hole transport layer, Ligand exchange(LE), QD-LED, Quantum dot(Qdot), Television system