Technology progress on quantum dot light-emitting diodes for next-generation displays

Abstract

This article focuses on state-of-the-art technologies used in the research on materials, devices and processes to achieve high-performance QD-LEDs.

Optoelectronic system and device integration for quantum-dot light-emitting diode white lighting with computational design framework

“…Specifically, the reason why the different EQEs are observed in the individual colours of the QD-LED device is that the QD layers have different properties in terms of both the photoluminescence quantum yield (PLQY) η QD and the quality factor Q (Methods and Supplementary Table 3 ). The PLQY of QD layer as a material- and device-level parameter is affected by inter-particle fluorescence resonance energy transfer (FRET) within the QD layer or at the interfaces of the QD layer for the surrounding transport layers 26 , 43 . The quality factor as a material-level parameter is determined by the recombination constants which are significantly affected by the defective trap density and the photon interactions in the QD nanoparticle 44 .…”

“…There are possible pathways to improve the stability of the QD-LED device. One is to optimise the core, shell and ligand materials of QD nanoparticles during synthesis to reduce the surface traps and to enhance the charge confinement effect 26 . Another is to isolate the QD layer from air contact during the transfer printing process since the oxygen or moisture in the air induces surface traps leading to device degradation 45 , 46 .…”

“…One of the practical system architectures that enable the integration of multiple pixelated QD-LED devices into a single lighting system is based upon patterned QD-LEDs [21][22][23] . The multiple pixelated patterns of QDs can be realised by a transfer printing technique to define different light emission areas on the device substrate [24][25][26] . However, the problem of optimising the light emission architecture of a white lighting system remains unresolved, as it requires an excessive amount of colour calculations for the massive combinations of QD colours and their geometrical combinations available for pixel layout.…”

Color Enrichment Solids of Spectrally Pure Colloidal Quantum Wells for Wide Color Span in Displays

“…[ 1 ] On the other hand, display technologies employed first cathode ray tubes, then fluorescent lamps and more recently LEDs as backlight sources in liquid crystal displays (LCDs). Nowadays displays of organic LEDs [ 2,3 ] are also in use and quantum dot LEDs [ 4,5 ] and micro‐LEDs [ 6,7 ] are currently in development. The driving force behind these changes has been partly improving the energy efficiency of the devices but also improving the colorimetric and photometric performance along with realizing a wide color gamut, [ 8 ] which can be realized when the spectrally narrow light sources are utilized.…”

63‐2: Student Paper: Thin‐film Compatible Process High Resolution Patterning of Quantum Dots Light‐emitting Diodes

“…Quantum dots (QD) based electroluminescent devices are believed to be the next solution for high-quality display. (1,2) The performance of the prototype devices in the laboratory has approached the commercialized standard for a practical display unit. (3)(4)(5)(6) However, the compatibility of solution-processed QDs with the current thin-film process is blocking the application of quantum dots light-emitting diodes (QLED).…”