Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 2, Issue 4, Pages 660-666Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3tc31602e
Keywords
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Funding
- National Natural Science Foundation of China [61177033, 21104009]
- China Postdoctoral Science Foundation [20110490123, 2012T50453]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1101074C]
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In this work, we prepared white-emitting multilayer Mn:ZnSe/Cu:ZnS quantum dots (QDs) in an aqueous solution. The core-shell multilayer structure provides a unique opportunity to dope different types of impurities into each host layer. White-emitting Mn: ZnSe/Cu: ZnS QDs have two emission bands at around 477 nm and 585 nm. The latter emission band around 585 nm is assigned to Mn-induced emission. The first emission band around 477 nm is caused by both the trap emission in the ZnSe core and Cu-doping emission from the trap state in the ZnS shell to the Cu+ energy level. Due to doping of Cu and Mn in QDs, internally doped Mn:ZnSe/Cu:ZnS QDs have good stability against UV irradiation or alteration due to surroundings during blending with polymers, making as-prepared QDs available for white light-emitting diodes.
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