Low-Threshold Amplified Spontaneous Emission in Blue Quantum Dots Enabled by Effectively Suppressing Auger Recombination

Wang, Sheng1; Yu, Jiahao2; Ye, Haiqiao1; Chi, Mingbo3; Yang, Heng1; Wang, Haihui1; Cao, Fan1; Li, Wenqiang1; Kong, Lingmei1; Wang, Lin1; Chen, Rui2; Yang, Xuyong1

2021-03-01

10.1002/adom.202100068

Advanced Optical Materials   影响因子和分区

2195-1071

The amplified spontaneous emissions in blue quantum dots (QDs) are still constrained by their high thresholds due to the challenge in engineering alloyed core-shell interface in the QDs with a wide bandgap to suppress Auger recombination. Compared with their red and green counterparts, the larger reactivity difference between the alloyed shell precursors makes it hard to regulate the composition and structure of the shell, and the smaller potential barrier between the core and the alloyed shell in blue QDs renders charge carriers tunneling into surface defects easier. Here, we employ a Lewis soft base ligand, 1-decanethiol, to balance the mismatched reactivity between Zn and Cd precursors for crafting a thick gradient alloyed shell with gradually increased potential barrier, which can not only restrict the charge carriers tunneling but also smooth the confinement potential. As a result, the resulting blue QDs show a long Auger lifetime of 1.3 ns, and a low threshold of 6.9 mu J cm(-2) excited by a femtosecond laser, which is the record value among all reported blue-emitting nanocrystals and comparable to those of state-of-the-art red and green QDs.

alloyed shells amplified spontaneous emission Auger recombination quantum dots reactivity balance

SCI ; EI

英语

通讯

National Natural Science Foundation of China[51675322,61735004] ; Shanghai Science and Technology Committee[19010500600] ; National Key Research and Development Program of China[2016YFB0401702]

Materials Science ; Optics

Materials Science, Multidisciplinary ; Optics

WOS:000628847400001

WILEY-V C H VERLAG GMBH

20211110085084

Augers ; Carrier mobility ; Excited states ; Femtosecond lasers ; Nanocrystals ; Shells (structures) ; Spontaneous emission ; Surface defects

Structural Members and Shapes:408.2 ; Mine and Quarry Equipment:502.2 ; Electromagnetic Waves:711 ; Semiconducting Materials:712.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Nanotechnology:761 ; Atomic and Molecular Physics:931.3 ; Materials Science:951

Web of Science

1.Shanghai Univ, Key Lab Adv Display & Syst Applicat, Minist Educ, 149 Yanchang Rd, Shanghai 200072, Peoples R China
2.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Guangdong, Peoples R China
3.Chinese Acad Sci, State Key Lab Appl Optic, Changchun Inst Optic Fine Mech & Phys, Changchun 130033, Peoples R China

Wang, Sheng,Yu, Jiahao,Ye, Haiqiao,et al. Low-Threshold Amplified Spontaneous Emission in Blue Quantum Dots Enabled by Effectively Suppressing Auger Recombination[J]. Advanced Optical Materials,2021,9.

Wang, Sheng.,Yu, Jiahao.,Ye, Haiqiao.,Chi, Mingbo.,Yang, Heng.,...&Yang, Xuyong.(2021).Low-Threshold Amplified Spontaneous Emission in Blue Quantum Dots Enabled by Effectively Suppressing Auger Recombination.Advanced Optical Materials,9.

Wang, Sheng,et al."Low-Threshold Amplified Spontaneous Emission in Blue Quantum Dots Enabled by Effectively Suppressing Auger Recombination".Advanced Optical Materials 9(2021).