Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 5, Issue 32, Pages 8243-8249Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tc02927f
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Funding
- National Natural Science Foundation of China [51502130]
- Natural Science Foundation of Jiangsu Province [SBK2015043303]
- Thousand Talents Program for Young Researchers
- Shuangchuang Program of Jiangsu Province
- Fundamental Research Funds for Central Universities
- Nanjing University
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Blue light-emitting diodes (LEDs) offer new opportunities in practical solid-state lighting and could play a significant role in reducing global energy consumption. Here, for the first time, we report the synthesis of highly fluorescent InP/ZnS small-core/thick-shell tetrahedral shaped QDs for blue LED applications. These QDs have absolute fluorescence quantum yield (QY) up to 76%, along with a full width at halfmaximum as narrow as 44 nm and a prolonged photoluminescence lifetime of above 60 ns, which are records for blue InP QDs. In addition, these small-core/thick-shell QDs show improved stability for over 1000 hours of storage under ambient conditions. Correspondingly, blue LED devices with a maximum luminance of 90 cd m(-2) were successfully demonstrated using InP/ZnS QDs as the active layer. This work may pave the way for the development of next generation environmentally friendly blue light sources using heavy-metal-free QDs with high efficiency, high color purity and high stability.
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