Improving spectral linewidth performance of InP quantum dots by promoting size-focused growth and decreasing exciton-phonon coupling

被引:3
|
作者
Wang, Linfeng [1 ]
Bai, Jinke [2 ]
Huang, Xiaoyue [3 ]
He, Xuanhui [3 ]
Yang, Zhiwei [3 ]
Zhang, Tingting [3 ]
Li, Qinghua [3 ]
Jin, Xiao [3 ]
Wang, Yuxiao [1 ]
Zhang, Xueru [1 ]
Song, Yinglin [1 ]
机构
[1] Harbin Inst Technol, Dept Phys, Harbin 150001, Peoples R China
[2] Taiyuan Univ, Dept Mat & Chem Engn, Taiyuan 030032, Peoples R China
[3] Lingnan Normal Univ, Guangdong Prov Key Lab Dev & Educ Special Needs Ch, Zhanjiang 524048, Peoples R China
来源
OPTICS EXPRESS | 2024年 / 32卷 / 14期
基金
中国国家自然科学基金;
关键词
NUCLEATION; LIGHT; SEMICONDUCTOR; MECHANISMS; BRIGHT;
D O I
10.1364/OE.523817
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
InP-based quantum dots (QDs) are widely adopted as a superior alternative to CdSe-based QDs in various fields owing to their high quantum yield, environmental friendliness, and excellent stability. However, improving its color purity remains a challenging task. In this work, we employ a multistage heating strategy to optimize the nucleation and shell growth processes of amino-phosphine-based InP/ZnSe/ZnS QDs for reducing emission linewidths. The multistage heating strategy mitigates the undesired formation of small-size cores by decreasing monomer supersaturation during the nucleation process, thereby promoting size-focusing growth. During the shelling process, multistage heating effectively suppresses Zn2+ diffusion into the InP core while ensuring high-quality shell growth, thus reducing the homogeneous broadening caused by exciton-phonon coupling. Compared to classical synthesis, the multistage heating strategy can reduce the emission linewidth of nucleation and shelling by 13.2% and 30.9% respectively. The optimized InP/ZnSe/ZnS QDs exhibit a narrow full width at half maximum (FWHM) of 41.5 nm at 630 nm, representing significant progress in studying spectral linewidths of amino-phosphine InP QDs. This work provides potential insights for further improving the spectral linewidth performance of InP QDs or other nanocrystals with similar reaction-limited growth systems.
引用
收藏
页码:25000 / 25011
页数:12
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