Publication: Ultraefficient green leds using quantum dots in liquid matrix
Program
KU Authors
Co-Authors
Advisor
Publication Date
2019
Language
English
Type
Journal Article
Journal Title
Journal ISSN
Volume Title
Abstract
Green spectral range, which has the highest human eye sensitivity, is one of the most fundamental colors in lighting and display. Quantum dots (QDs) offer exceptional optical properties including high quantum yield (QY), strong absorption, and narrow emission linewidths for efficient green-emitting diodes. In this article, we demonstrated QD-based light-emitting diodes (QD-LEDs) that operate at a luminous efficiency (LE) level of 95 lumens per electrical watt, the luminous efficacy of optical radiation of 409 lumens per optical watt, and external quantum efficiency (EQE) of 23.3 % in the green spectral region. For that, we synthesized 1-octanethiol-capped CdSe/ZnS QDs with an absolute QY of 91 % and integrated them in a liquid matrix that allows conservation of the QD efficiency in device architecture. Our simulations were in agreement with the performance of the fabricated QD-LEDs, and they showed that the QD-LEDs can be further improved to reach LE levels over 250 lm/W.
Description
Source:
IEEE Transactions on Electron Devices
Publisher:
IEEE-Inst Electrical Electronics Engineers Inc
Keywords:
Subject
Electrical electronics engineering, Physics