May 2025
Intermediate to advanced
512 pages
16h 39m
English
Content preview from Quantum Dot Display Science and Technology
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Chapter 9Quantum Dot Light-emitting Device Materials, Device Physics, and Fabrication: Cadmium-free
Igor Coropceanu, Heeyoung Jung, Christian Ippen
Shoei Electronic Materials, Inc., 233 S Hillview Dr, Milpitas, CA 95035, USA
9.1 Introduction
9.1.1 Benefits of Quantum Dot Light-emitting Devices
Quantum dot (QD) electroluminescence is widely perceived to be a promising emergent display technology because it combines the best features of QDs and organic light-emitting devices (OLEDs). In basic terms, QD-LED is the solution-processed counterpart of OLED, with QDs serving as the emitter. A very thin film (tens of nanometers) of QDs is sandwiched between hole- and electron-transporting layers, and the luminescence is driven by direct injection of charge carriers. This is different from QD-OLED, where a relatively thick film (micrometers) of QDs converts blue light from a vacuum-processed tandem OLED to red and green light via photoluminescence. The total stack thickness of a QD-LED is in the range of hundreds of nanometers, and depending on substrate and encapsulation technology, the original promise of OLED for ultrathin displays with potentially flexible and transparent implementations is preserved in QD-LEDs. Other OLED-type features are realized in QD-LEDs as well: QD-LED displays have a high contrast ratio and high dynamic range, because the brightness of each pixel can be controlled directly all the way to being completely turned off. They have a wide viewing angle because ...
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