Issue 20, 2018
From the journal:

Journal of Materials Chemistry C

Tuning the emission spectrum of highly stable cesium lead halide perovskite nanocrystals through poly(lactic acid)-assisted anion-exchange reactions†

Longshi Rao, ORCID logo ab   Yong Tang,a   Caiman Yan,a   Jiasheng Li,a   Guisheng Zhong,a   Kairui Tang,c   Binhai Yu,a   Zongtao Li ORCID logo *a  and  Jin Z. Zhang ORCID logo *b  

* Corresponding authors

a Engineering Research Centre of Green Manufacturing for Energy-Saving and New-Energy Technology, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, China
E-mail: meztli@scut.edu.cn

b Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064, USA
E-mail: zhang@ucsc.edu

c The Mechanical Engineering, Pennsylvania State University, Harrisburg, PA 17057, USA

Abstract

We demonstrate an organic macromolecule-assisted anion-exchange reaction method for tuning the emission spectrum of cesium lead halide perovskite (CsPbX3) nanocrystals (NCs) from green to near-ultraviolet using a microreactor. Using poly(lactic acid) (PLA), the emission peak of CsPbX3 NCs can be tuned from 514 nm to 420 nm while maintaining high photoluminescence (PL) quantum yields (QYs) of 33–90%. By taking advantage of the microreactor, we synthesize parent CsPbBr3 NCs and complete anion-exchange reactions at the same time, which is more efficient than most previously reported methods. The stability of CsPbX3 NCs is improved by PLA coating, especially for CsPbCl3, which shows long-term stability under ambient conditions for at least two weeks. The CsPbBr3 NCs are utilized with a red phosphor on a blue light emitting-diode (LED) chip, achieving white light emission with a luminous efficacy of 62.93 lm W−1 under a 20 mA driving current. Highly efficient white LEDs (wLEDs) demonstrate the potential of halide perovskite NCs for optoelectronic applications, including low-cost displays, lighting, and optical communication.

Graphical abstract: Tuning the emission spectrum of highly stable cesium lead halide perovskite nanocrystals through poly(lactic acid)-assisted anion-exchange reactions

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Article information

DOI
https://doi.org/10.1039/C8TC00582F
Article type
Paper
Submitted
02 Feb 2018
Accepted
16 Apr 2018
First published
17 Apr 2018

J. Mater. Chem. C, 2018,6, 5375-5383

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Tuning the emission spectrum of highly stable cesium lead halide perovskite nanocrystals through poly(lactic acid)-assisted anion-exchange reactions

L. Rao, Y. Tang, C. Yan, J. Li, G. Zhong, K. Tang, B. Yu, Z. Li and J. Z. Zhang, J. Mater. Chem. C, 2018, 6, 5375 DOI: 10.1039/C8TC00582F

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