Publication detail

Increasing the Performance and Stability of Red-Light-Emitting Diodes Using Guanidinium Mixed-Cation Perovskite Nanocrystals

Serafini, P. Villanueva-Antoli, A. Das Adhikari, S. Masi, S. Sanchez, RS. Rodriguez-Pereira, J. Pradhan, B. Hofkens, J. Gualdron-Reyes, AF. Mora-Sero, I.

Original Title

Increasing the Performance and Stability of Red-Light-Emitting Diodes Using Guanidinium Mixed-Cation Perovskite Nanocrystals

Type

journal article in Web of Science

Language

English

Original Abstract

Halide perovskite nanocrystals (PNCs) exhibit growing attention in optoelectronics due to their fascinating color purity and improved intrinsic properties. However, structural defects emerging in PNCs progressively hinder the radiative recombination and carrier transfer dynamics, limiting the performance of light-emitting devices. In this work, we explored the introduction of guanidinium (GA+) during the synthesis of high-quality Cs(1-x)GA(x)PbI(3) PNCs as a promising approach for the fabrication of efficient bright-red light-emitting diodes (R-LEDs). The substitution of Cs by 10 mol % GA allows the preparation of mixed-cation PNCs with PLQY up to 100% and long-term stability for 180 days, stored under air atmosphere and refrigerated condition (4 degrees C). Here, GA(+) cations fill/replace Cs+ positions into the PNCs, compensating intrinsic defect sites and suppressing the non-radiative recombination pathway. LEDs fabricated with this optimum material show an external quantum efficiency (EQE) near to 19%, at an operational voltage of 5 V (50-100 cd/m(2)) and an operational half-time (t(50)) increased 67% respect CsPbI3 R-LEDs. Our findings show the possibility to compensate the deficiency through A-site cation addition during the material synthesis, obtaining less defective PNCs for efficient and stable optoelectronic devices.

Keywords

HALIDE PEROVSKITES; PASSIVATION; SUPPRESSION; LIGANDS; CSPBX3; BR

Authors

Serafini, P.; Villanueva-Antoli, A.; Das Adhikari, S.; Masi, S.; Sanchez, RS.; Rodriguez-Pereira, J.; Pradhan, B.; Hofkens, J.; Gualdron-Reyes, AF.; Mora-Sero, I.

Released

9. 5. 2023

Publisher

AMER CHEMICAL SOC

Location

WASHINGTON

ISBN

1520-5002

Periodical

Chemistry of Materials

Year of study

35

Number

10

State

United States of America

Pages from

3998

Pages to

4006

Pages count

9

URL

https://pubs.acs.org/doi/10.1021/acs.chemmater.3c00269

BibTex

@article{BUT183939,
  author="Serafini, P. and Villanueva-Antoli, A. and Das Adhikari, S. and Masi, S. and Sanchez, RS. and Rodriguez-Pereira, J. and Pradhan, B. and Hofkens, J. and Gualdron-Reyes, AF. and Mora-Sero, I.",
  title="Increasing the Performance and Stability of Red-Light-Emitting Diodes Using Guanidinium Mixed-Cation Perovskite Nanocrystals",
  journal="Chemistry of Materials",
  year="2023",
  volume="35",
  number="10",
  pages="3998--4006",
  doi="10.1021/acs.chemmater.3c00269",
  issn="1520-5002",
  url="https://pubs.acs.org/doi/10.1021/acs.chemmater.3c00269"
}