Due
to the inherent toxicity of cadmium selenide (CdSe)-based quantum
dots (QDs), Cd-free alternatives are being widely investigated. Indium
phosphide (InP) QDs have shown great potential as a replacement for
CdSe QDs in display applications. However, the performance of InP-based
quantum dot light-emitting diodes (QLEDs) is still far behind that
of the CdSe-based devices. In this study, we wanted to show the effects
of different approaches to improving the performance of InP-based
QLED devices. We investigated the effect of magnesium (Mg) doping
in ZnO nanoparticles, which is used as an n-type electron transport
layer, in balancing the charge transfer in InP-based QLED devices.
We found that an increasing Mg doping level can broaden ZnO band gap,
shift its energy levels, but most importantly, increase its resistivity;
as a result, the electron current density is significantly reduced
and the device efficiency is improved. We also investigated the effect
of high-photoluminescence quantum yield emitters and different QLED
architectures on the device performance. Through optimizing QD structures
and devices, red InP QLEDs with the current efficiencies as high as
11.6 cd/A were fabricated.
In this paper we describe current state of the active matrix quantum dot light emitting diode (AMQLED) display technology and analyze the ways this technology can be developed for massproduction. We discuss material requirements, device structures, electrical and optical properties of quantum dot light emitting diodes (QLED). We also show how active matrix displays based on quantum dot light emitting diodes (QLED) in a near future can provide a compelling alternative to the OLED and LCD based displays.
In this paper we describe current trends in mobile display technology, and analyze the requirements for those displays as well as the ways of their fulfillment. We also show how active matrix displays based on organic light emitting diode (OLED) technology should provide basis for the economic manufacture of displays for mobile applications.
Waveguide liquid crystal display (WLCD) is a newly developed transparent display technology. Since polarizers and color filters are not necessary for the WLCD, high transparency is easily reached. Meanwhile, owing to the fast response time, field sequential color (FSC) can be applied to realize full color display. In this work, by optimizing materials and process conditions, we obtained lower driving voltage and higher contrast ratio than previously reported. These enhanced characteristics provide the possibility for designing larger size panel. Finally, we have developed an 8 inch full color transparent WLCD prototype and discussed the upgrading methods to improve brightness uniformity.
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