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Tuning energy transfer efficiency in quantum dots mixture by controling donor/acceptor ratio |
| Chang Liu(刘畅)1,†, Jing Liang(梁晶)2,†, Fangfang Wang(王芳芳)3,†, Chaojie Ma(马超杰)2, Kehai Liu(刘科海)4, Can Liu(刘灿)2, Hao Hong(洪浩)2,¶, Huaibin Shen(申怀彬)3,§, Kaihui Liu(刘开辉)1,2,‡, and Enge Wang(王恩哥)1,4 |
International Centre for Quantum Materials, Collaborative Innovation Centre of Quantum Matter, Peking University, Beijing 100871, China;
2 State Key Laboratory for Mesoscopic Physics, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China;
3 Key Laboratory for Special Functional Materials of Ministry of Education, School of Materials and Engineering, Henan University, Kaifeng 475001, China;
4 Songshan Lake Materials Laboratory, Institute of Physics, Chinese Academy of Sciences, Dongguan 523000, China |
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Abstract Improving the emission performance of colloidal quantum dots (QDs) is of paramount importance for their applications on light-emitting diodes (LEDs), displays and lasers. A highly promising approach is to tune the carrier recombination channels and lifetime by exploiting the energy transfer process. However, to achieve this precise emission optimization, quantitative modulation on energy transfer efficiency is highly desirable but still challenging. Here, we demonstrate a convenient approach to realize tunable energy transfer efficiency by forming QDs mixture with controllable donor/acceptor (D/A) ratio. With the mixing ratio ranging from 16/1 to 1/16, the energy transfer efficiency could be effectively tuned from near zero to ~70%. For the high mixing ratio of 16/1, acceptors obtain adequate energy supplied by closely surrounding donors, leading to~2.4-fold PL enhancement. While for the low mixing ratio, the ultrafast and efficient energy extraction process directly suppresses the multi-exciton and Auger recombination in the donor, bringing about a higher threshold. The facile modulation of emission performance by controllably designed mixing ratio and quantitatively tunable energy transfer efficiency will facilitate QD-based optoelectronic and photovoltaic applications.
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Received: 15 August 2021
Revised: 10 September 2021
Accepted manuscript online: 24 September 2021
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PACS:
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78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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78.67.Hc
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(Quantum dots)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 52025023, 51991342, 52021006, 11888101, and 61922028), the Key R&D Program of Guangdong Province, China (Grant Nos. 2020B010189001, 2019B010931001, and 2018B030327001), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB33000000), Beijing Natural Science Foundation, China (Grant No. JQ19004), the Pearl River Talent Recruitment Program of Guangdong Province, China (Grant No. 2019ZT08C321), and China Postdoctoral Science Foundation (Grant No. 2021T140022). |
Corresponding Authors:
Hao Hong, Huaibin Shen, Kaihui Liu
E-mail: khliu@pku.edu.cn;shenhuaibin@henu.edu.cn;haohong@pku.edu.cn
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Cite this article:
Chang Liu(刘畅), Jing Liang(梁晶), Fangfang Wang(王芳芳), Chaojie Ma(马超杰), Kehai Liu(刘科海), Can Liu(刘灿), Hao Hong(洪浩), Huaibin Shen(申怀彬), Kaihui Liu(刘开辉), and Enge Wang(王恩哥) Tuning energy transfer efficiency in quantum dots mixture by controling donor/acceptor ratio 2021 Chin. Phys. B 30 127802
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