Journal
JOURNAL OF LUMINESCENCE
Volume 192, Issue -, Pages 867-874Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2017.08.021
Keywords
Core/shell quantum dots; CdZnS/ZnSe; White light emission; QLEDs; Photoluminescence
Categories
Funding
- National Natural Science Foundation of China [61366003, 11564026]
- Outstanding Youth Funds of Jiangxi Province [20171BCB23051, 20171BCB23052]
- Natural Science Foundation of Jiangxi Province [20151BAB212001, 20151BBE50114, 20161BAB212035, 20171B AB202036, 20171BAB216017]
- Science and Technology Project of the education department of Jiangxi Province, China [GJJ150727, GJJ160723, GJJ160681]
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CdZnS based quantum dots are emerging as promising light sources for light-emitting diodes (LEDs). Although current CdZnS/ZnS quantum dots exhibit good performances in ultraviolet (UV) or blue light, it is hard to achieve efficient red or green emission owing to the intrinsic limitation of the core-shell system, in which ZnS shell only serves as passivation layer to enhance the luminescence. Instead, we introduce a versatile ZnSe shell with a moderate band gap onto the CdZnS core. Evidences show that ZnSe, on one hand, can passivate the core surface which leads to bright emissions. On the other hand, ZnSe shell is essential in tuning the emission to the visible region. The as-prepared CdZnS/ZnSe quantum dots show good color tunability, which is ranging from deep-blue to red. Bright white LEDs are fabricated by appropriately integrating a mixture of red, yellow and green emissive CdZnS/ZnSe quantum dots on the blue-emitting GaN LED chip. The fabricated white quantum dot-based LED demonstrates good luminescent and visual performance with a color rendering index of 85.2 and a correlated color temperature of 4072 K. These results suggest that CdZnS/ZnSe quantum dots hold great promise for the next-generation white light source.
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