Comparative study of photoluminescence dynamics of CdSe quantum dots on glass and ITO

Xiang, Guohong1,2,3,4,5,6; Zhang, Xinhai1,2; Wang, Kai1,2,5,6; Kwok, Hoi Sing3,4; Sun, Xiao Wei1,2,5,6

2024-09-23

10.1364/OE.538826

OPTICS EXPRESS   影响因子和分区

1094-4087

This study investigates the photoluminescence (PL) dynamics of CdSe quantum dots (QDs) on indium tin oxide (ITO) substrates under various excitation intensities to understand the impact of QD charging on PL. The analysis reveals that under low pump fluence, approximately 75% of the QDs in the assembly are negatively charged due to direct contact with the ITO substrate, resulting in a shortened average PL lifetime and weakened PL intensity. Under high pump fluence conditions, the charging percentage is further increased by the photo charging effect, leading to the undesirable depletion of the biexciton state through the accelerated non-radiative Auger process. The PL dynamic mechanism is analyzed to explain the absence of amplified spontaneous emission (ASE) in the QD on ITO samples. The findings of this study have potential implications for the development and optimization of QD-based devices, such as quantum dot light-emitting diodes (QLEDs) and quantum dot lasers, by providing insights into the detrimental effects of QD charging on device performance and suggesting strategies to mitigate these effects. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

SCI

英语

第一 ; 通讯

Development and Reform Commission of Shenzhen Municipality[XMHT20220114005] ; Shenzhen Science and Technology Innovation Program[JCYJ20220818100411025] ; Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting[ZDSYS201707281632549] ; Program for University Key Laboratory of Guangdong Province for Advanced Quantum Dot Displays and Lighting[2017KSYS007] ; National Natural Science Foundation of China[62122034] ; National Key Research and Development Program of China["2021YFB3602703","2022YFB3602903","2022YFB3606504"]

Optics

Optics

WOS:001326989300002

Optica Publishing Group

Web of Science

1.Southern Univ Sci & Technol, Inst Nanosci & Applicat, Shenzhen, Peoples R China
2.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen, Peoples R China
3.Hong Kong Univ Sci & Technol, State Key Lab Adv Displays & Optoelect Technol, Hong Kong, Peoples R China
4.Hong Kong Univ Sci & Technol, Dept Elect & Comp Engn, Hong Kong, Peoples R China
5.Southern Univ Sci & Technol, Guangdong Univ Key Lab Adv Quantum Dot Displays &, Minist Educ, Key Lab Energy Convers & Storage Technol, Shenzhen, Peoples R China
6.Southern Univ Sci & Technol, Shenzhen Key Lab Adv Quantum Dot Displays & Lighti, Shenzhen, Peoples R China

Xiang, Guohong,Zhang, Xinhai,Wang, Kai,et al. Comparative study of photoluminescence dynamics of CdSe quantum dots on glass and ITO[J]. OPTICS EXPRESS,2024,32(20).

Xiang, Guohong,Zhang, Xinhai,Wang, Kai,Kwok, Hoi Sing,&Sun, Xiao Wei.(2024).Comparative study of photoluminescence dynamics of CdSe quantum dots on glass and ITO.OPTICS EXPRESS,32(20).

Xiang, Guohong,et al."Comparative study of photoluminescence dynamics of CdSe quantum dots on glass and ITO".OPTICS EXPRESS 32.20(2024).