| Title | Identifying the dominant carrier of CdSe-based blue quantum dot light-emitting diode |
| Author | |
| Corresponding Author | Sun, Xiao Wei |
| Publication Years | 2023-03-13
|
| DOI | |
| Source Title | |
| ISSN | 0003-6951
|
| EISSN | 1077-3118
|
| Volume | 122Issue:11 |
| Abstract | Unlike red and green quantum dot light-emitting diodes (QLEDs), it is not clear whether a blue QLED is an electron-dominated device. In this work, we identify that electron is over-injected in blue QLEDs by impedance spectroscopy. By analyzing the capacitance-voltage characteristics of the single-carrier devices, we find that the built-in voltage of the electron-only device is smaller than that of the hole-only device. Therefore, electron injection is more efficient than hole injection in blue QLEDs. To support our arguments, we employ a red QD as a fluorescent sensor to spatially investigate the exciton recombination zone of a blue QLED. Consequently, we observe that the exciton recombination zone of the blue QLED is close to the hole transport layer, and it shifts toward an electron transport layer with the increase in the applied bias. Our work provides a practical method for identifying the excess carrier in blue QLEDs, and it could be applied to other types of QLEDs. |
| URL | [Source Record] |
| Indexed By | |
| Language | English
|
| SUSTech Authorship | First
; Corresponding
|
| Funding Project | National Key Research and Development Program of China["2021YFB3602703","2022YFB3606504","2022YFB3602903"]
; National Natural Science Foundation of China[62122034]
; Guangdong University Key Laboratory for Advanced Quantum Dot Displays[2017KSYS007]
; Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting[ZDSYS201707281632549]
|
| WOS Research Area | Physics
|
| WOS Subject | Physics, Applied
|
| WOS Accession No | WOS:000948796400001
|
| Publisher | |
| ESI Research Field | PHYSICS
|
| Data Source | Web of Science
|
| Citation statistics |
Cited Times [WOS]:0
|
| Document Type | Journal Article |
| Identifier | http://kc.sustech.edu.cn/handle/2SGJ60CL/523897 |
| Department | Department of Electrical and Electronic Engineering |
| Affiliation | 1.Southern Univ Sci & Technol, Inst Nanosci & Applicat, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China 2.Southern Univ Sci & Technol, Hong Kong, Guangdong, Peoples R China |
| First Author Affilication | Department of Electrical and Electronic Engineering; Southern University of Science and Technology |
| Corresponding Author Affilication | Department of Electrical and Electronic Engineering; Southern University of Science and Technology |
| First Author's First Affilication | Department of Electrical and Electronic Engineering |
| Recommended Citation GB/T 7714 |
Qu, Xiangwei,Xiang, Guohong,Ma, Jingrui,et al. Identifying the dominant carrier of CdSe-based blue quantum dot light-emitting diode[J]. APPLIED PHYSICS LETTERS,2023,122(11).
|
| APA |
Qu, Xiangwei.,Xiang, Guohong.,Ma, Jingrui.,Liu, Pai.,Kyaw, Aung Ko Ko.,...&Sun, Xiao Wei.(2023).Identifying the dominant carrier of CdSe-based blue quantum dot light-emitting diode.APPLIED PHYSICS LETTERS,122(11).
|
| MLA |
Qu, Xiangwei,et al."Identifying the dominant carrier of CdSe-based blue quantum dot light-emitting diode".APPLIED PHYSICS LETTERS 122.11(2023).
|
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