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Issue 7, 2015
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Bright, efficient, and color-stable violet ZnSe-based quantum dot light-emitting diodes

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Abstract

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.

Graphical abstract: Bright, efficient, and color-stable violet ZnSe-based quantum dot light-emitting diodes

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Publication details

The article was received on 08 Nov 2014, accepted on 04 Jan 2015 and first published on 05 Jan 2015


Article type: Paper
DOI: 10.1039/C4NR06593J
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Citation: Nanoscale, 2015,7, 2951-2959
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    Bright, efficient, and color-stable violet ZnSe-based quantum dot light-emitting diodes

    A. Wang, H. Shen, S. Zang, Q. Lin, H. Wang, L. Qian, J. Niu and L. Song Li, Nanoscale, 2015, 7, 2951
    DOI: 10.1039/C4NR06593J

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