8.3: Distinguished Paper: Next‐Generation Display Technology: Quantum‐Dot LEDs

Abstract

Colloidal quantum dot-based hybrid light-emitting diodes (QD-LEDs) have been demonstrated that exhibit quantum efficiencies >10% for all three fundamental colors (>18% for green), device lifetimes of >280K hours, extremely well-tuned color fidelity approaching Rec. 2020 specifications, and complete solution processing to fabricate devices. The extremely desirable properties of color tunability/fidelity, long lifetime, and low cost processing from solutions makes QD-LED technology disruptive and will lead to next generation displays.

Pure Blue and Highly Luminescent Quantum‐Dot Light‐Emitting Diodes with Enhanced Electron Injection and Exciton Confinement via Partially Oxidized Aluminum Cathode

“…Further optimizing charge balance by inserting an insulating layer between the QD layer and the ETL, the EQE of red QD‐LED can be further improved to 20.5% . To balance the charge injection and transportation, QD‐LEDs with multilayer structures were used and the current and power efficiencies of blue, green, and red emitting QD‐LEDs were improved to 6.1 cd A −1 and 5.0 lm W −1 , 70 cd A −1 and 58 lm W −1 , and 12.3 cd A −1 and 17.2 lm W −1 , respectively . By optimizing the ZnS shelling time, highly fluorescent blue alloyed QDs of CdZnS/ZnS were synthesized, with quantum yield up to 98%, giving devices the luminance and current efficiency of 2624 cd m −2 and 2.2 cd A −1 .…”

25‐1: Invited Paper: Improvement of Viewing Angle and Color Gamut of Twisted Nematic Liquid Crystal Display using Inkjet‐printed Quantum Rod Color Pixel Converter

“…Recently, expansion of the available display color gamut to meet the BT.2020 color gamut standard has become a major research goal [1][2][3]. Nanomaterials such as nanocrystals or quantum dots, which are attractive for use as fluorescent or electroluminescent materials, have also been used in display applications to enhance the display color gamut because they offer sharp emission spectra.…”

“…This is a major advantage in mobile display applications, because it allows reduction of the QR layer thickness. Four types of display devices have been proposed based on use of these QRs, including a backlight, emissive color pixels for use with liquid crystal displays (LCDs) and blue organic light-emitting diode (OLED) displays, and a quantum dot (QD)-based light-emitting diode (LED) display [3,7]. Here, we explore the use of QRs in emissive color pixels when they are combined in an LCD structure [9,10,11], as shown in Fig.…”

Use of quantum rods for display applications

“…Recently, expansion of color gamut to meet the BT2020 standard has been a research goal. [1][2][3] Nanomaterials such as nanocrystals or quantum dots, which are attractive fluorescent or electroluminescent materials, have been used in display applications to enhance color gamut because of their sharp emission spectra. The emission spectra of spherical nanomaterials can be tuned over a broad range of wavelengths by modifying their diameter.…”

“…6 Three types of displays using these QRs have been proposed: a backlight, an emissive color pixel, and a light-emitting diode (LED). 3,7 Here, we explore the use of QRs in two of these three candidates, as a backlight and emissive color pixels combined with a liquid crystal display (LCD) 15 or organic light-emitting diode (OLED), 16 as shown in Fig. 1(a), (b), and (c), respectively.…”