Integration of Highly Luminescent Lead Halide Perovskite Nanocrystals on Transparent Lead Halide Nanowire Waveguides through Morphological Transformation and Spontaneous Growth in Water

Journal Article · 19 January 2022 · Small

DOI: https://doi.org/10.1002/smll.202105009 · OSTI ID:1981440

Chen, Tao ^[1]; Wang, Chong ^[1]; Xing, Xinxin ^[2]; Qin, Zhaojun ^[2]; Qin, Fan ^[3]; Wang, Yanan ^[3]; Alam, Md Kamrul ^[3]; Hadjiev, Viktor G. ^[3]; Yang, Guang ^[3]; Ye, Shuming ^[1]; Yang, Jie ^[1]; Wang, Rongfei ^[1]; Yue, Shuai ^[2]; Zhang, Di ^[4]; Shang, Zhongxia ^[4]; Robles‐Hernandez, Francisco C. ^[3]; Calderon, Hector A. ^[5]; Wang, Haiyan ^[4]; Wang, Zhiming ^[6]; Bao, Jiming  ^[3]

---

1. Yunnan University, Kunming (China)
2. University of Houston, TX (United States); University of Electronic Science and Technology of China, Chengdu (China)
3. University of Houston, TX (United States)
4. Purdue University, West Lafayette, IN (United States)
5. Instituto Politecnico Nacional (IPN), Mexico City (Mexico)
6. University of Electronic Science and Technology of China, Chengdu (China)

The integration of highly luminescent CsPbBr₃ quantum dots on nanowire waveguides has enormous potential applications in nanophotonics, optical sensing and quantum communications. On the other hand, CsPb₂Br₅ nanowires have also attracted a lot of attention due to their unique water stability and controversial luminescent property. Here we first report the growth of CsPbBr₃ nanocrystals on CsPb₂Br₅ nanowires by simply immersing CsPbBr₃ powder into pure water, CsPbBr_3-γX_γ (X = Cl, I) nanocrystals on CsPb₂Br_5-γX_γ nanowires are then synthesized for tunable light sources. Systematic structure and morphology studies, including in-situ monitoring, revealed that CsPbBr₃ powder was first converted to CsPb₂Br₅ microplatelets in water, followed by a morphological transformation from CsPb₂Br₅ microplatelets to nanowires, which is a kinetic dissolution-recrystallization process controlled by electrolytic dissociation and supersaturation of CsPb₂Br₅. CsPbB_r3 nanocrystals are spontaneously formed on CsPb₂Br₅ nanowires when nanowires are collected from the aqueous solution. Raman spectroscopy, combined photoluminescence and SEM imaging confirm that the bright emission originates from CsPbBr_3-γX_γ nanocrystals while CsPb₂Br_5-γX_γ nanowires are transparent waveguides. In conclusion, the intimate integration of nanoscale light sources with a nanowire waveguide is demonstrated through the observation of the wave guiding of light from nanocrystals and Fabry-Perot interference modes of the nanowire cavity.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Robert A. Welch Foundation; National Science Foundation (NSF)
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1981440
• Journal Information: Small, Journal Name: Small Journal Issue: 11 Vol. 18; ISSN 1613-6810
• Publisher: WileyCopyright Statement
• Country of Publication: United States
• Language: English