Journal
ORGANIC ELECTRONICS
Volume 90, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2021.106086
Keywords
Quantum-dot light-emitting diodes; Charge injection; Energy transfer; Auger recombination; Field-induced ionization
Funding
- National Natural Science Foundation of China [11974141, 12074148]
- Fundamental Research Funds for the Central Universities
- Science and Technology Development Project of Jilin Province [20180201057YY]
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This article reviews the electroluminescence properties and fabrication/characterization technologies of Quantum-dot light-emitting diodes (QLEDs), emphasizing the significance of dynamic processes of charge carriers and related characterization technology. Strategies to improve device performance through interface modification and QD design are summarized, along with the corresponding physics and chemistry mechanisms.
Quantum-dot light-emitting diodes (QLEDs) are unarguably the most successful member of rapidly developing family of devices based on quantum dots (type II-VI group compounds). Herein, the electroluminescence properties and fabrication/characterization technologies of QLEDs are reviewed. Particular emphasis is devoted to the dynamic processes of charge carriers and the related characterization technology because QLEDs are electro-optic conversion devices whose performance is to a great extent determined by the carrier transport/distribution and exciton formation. The utility of spectroscopic technologies, including steady/transient electroluminescence and photoluminescence, electro-absorption spectrum, and differential absorption spectrum are explained. Additionally, displacement current measurement technology is also discussed due to its potential to characterize the trapped charges within the devices. The strategies to improve the device performance by interface modification and QD design are summarized and the corresponding physics and chemistry mechanisms are discussed. Finally, a summary and outlook are shown about the challenge faced by QLED, as well as possible pathway to enhancing the device performance.
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