期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 7, 期 12, 页码 3429-3435出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc04414g
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资金
- Institute for Information & Communications Technology Promotion (IITP) - Korean government (MSIT) [2017-0-00065]
- National Research Council of Science & Technology (NST) grant by the Korean government (MSIT) [CMP-16-05-ETRI]
- Electronics and Telecommunications Research Institute (ETRI) - Korean government [19ZB1210]
- National Research Council of Science & Technology (NST), Republic of Korea [CMP-16-05-ETRI] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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