期刊
NANOSCALE
卷 7, 期 7, 页码 2951-2959出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr06593j
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资金
- National Nature Science Foundation of China [21201055, 61474037]
- Program for Science & Technology Innovation Talents in University of Henan Province [14HASTIT009]
- Program for Changjiang Scholars and Innovative Research Team in University [PCS IRT1126]
In this paper, highly stable violet-blue emitting ZnSe/ZnS core/shell QDs have been synthesized by a novel low temperature injection and high temperature growth method. The resulting nearly monodisperse ZnSe/ZnS core/shell QDs exhibit excellent characteristics such as a high color saturation (typical spectral full width at half-maximum between 12 and 20 nm), good emission tunability in the violet-blue range of wavelengths from 400 to 455 nm, a high absolute PL quantum yield (up to 83%), and superior chemical and photochemical stability. By employing ZnSe/ZnS core/shell quantum dots (QDs) as emitters with a fully solution processable method, bright, efficient, and color-stable violet Cd-free quantum dot-based light-emitting diodes (QD-LEDs) with maximum luminance up to 2632 cd m(-2) and a peak EQE of 7.83% have been demonstrated successfully. Considering the factors of the photopic luminosity function, the brightness and efficiency results of such violet QD-LEDs not only represent a 12-fold increase in device efficiency and an extraordinary 100 times increase in luminance compared with previous Cd-free QD-LEDs but also can be much superior to the best performance (1.7%) of their Cd-based violet counterparts. These results demonstrate significant progress in short-wavelength QD-LEDs and shed light on the acceleration of commercial application of environmentally-friendly violet QD-based displays and lighting.
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