Publication detail

Efficient and Stable Blue- and Red-Emitting Perovskite Nanocrystals through Defect Engineering: PbX2 Purification

Lee, C. Shin, Y. Villanueva-Antoli, A. Das Adhikari, S. Rodriguez-Pereira, J. Macak, JM. Mesa, CA. Gimenez, S. Yoon, SJ. Gualdron-Reyes, AF. Mora-Sero, I.

Original Title

Efficient and Stable Blue- and Red-Emitting Perovskite Nanocrystals through Defect Engineering: PbX2 Purification

Type

journal article in Web of Science

Language

English

Original Abstract

Current efforts to reduce the density of structural defects such as surface passivation, doping, and modified synthetic protocols have allowed us to grow high-quality perovskite nanocrystals (PNCs). However, the role of the purity of the precursors involved during the PNC synthesis to hinder the emergence of defects has not been widely explored. In this work, we analyzed the use of different crystallization processes of PbX2 (X = Cl- or I-) to purify the chemicals and produce highly luminescent and stable CsPbCl3-xBrx and CsPbI3 PNCs. The use of a hydrothermal (Hyd) process to improve the quality of the as-prepared PbCl2 provides blue-emitting PNCs with efficient ligand surface passivation, a maximum photoluminescence quantum yield (PLQY) of similar to 88%, and improved photocatalytic activity to oxidize benzyl alcohol, yielding 40%. Then, the hot recrystallization of PbI2 prior to Hyd treatment led to the formation of red-emissive PNCs with a PLQY of up to 100%, long-term stability around 4 months under ambient air, and a relative humidity of 50-60%. Thus, CsPbI3 light-emitting diodes were fabricated to provide a maximum external quantum efficiency of up to 13.6%. We claim that the improvement of the PbX2 crystallinity offers a suitable stoichiometry in the PNC structure, reducing nonradiative carrier traps and so maximizing the radiative recombination dynamics. This contribution gives an insight into how the manipulation of the PbX2 precursor is a profitable and potential alternative to synthesize PNCs with improved photophysical features by making use of defect engineering.

Keywords

MIXED HALIDE PEROVSKITES; QUANTUM DOTS; ALPHA-CSPBI3 PEROVSKITE; SURFACE; CSPBX3; LIGAND; BR; STABILITY; CL

Authors

Lee, C.; Shin, Y.; Villanueva-Antoli, A.; Das Adhikari, S.; Rodriguez-Pereira, J.; Macak, JM.; Mesa, CA.; Gimenez, S.; Yoon, SJ.; Gualdron-Reyes, AF.; Mora-Sero, I.

Released

23. 11. 2021

Publisher

AMER CHEMICAL SOC

Location

WASHINGTON

ISBN

1520-5002

Periodical

Chemistry of Materials

Year of study

33

Number

22

State

United States of America

Pages from

8745

Pages to

8757

Pages count

13

URL

https://pubs.acs.org/doi/10.1021/acs.chemmater.1c02772

BibTex

@article{BUT177210,
  author="Lee, C. and Shin, Y. and Villanueva-Antoli, A. and Das Adhikari, S. and Rodriguez-Pereira, J. and Macak, JM. and Mesa, CA. and Gimenez, S. and Yoon, SJ. and Gualdron-Reyes, AF. and Mora-Sero, I.",
  title="Efficient and Stable Blue- and Red-Emitting Perovskite Nanocrystals through Defect Engineering: PbX2 Purification",
  journal="Chemistry of Materials",
  year="2021",
  volume="33",
  number="22",
  pages="8745--8757",
  doi="10.1021/acs.chemmater.1c02772",
  issn="1520-5002",
  url="https://pubs.acs.org/doi/10.1021/acs.chemmater.1c02772"
}