Electric-Field-Enhanced Electroluminescence Color Tuning of Colloidal Type-II Tetrapods

Chenhao Wang, Jianhui Fu, Qi Wei, Hui Ren, Qi Liu, Luwei Zhou, Pengzhi Wang, Mingjie Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Color-tunable electroluminescence (EL) from a single emitting material can be used to develop single-pixel multicolor displays. However, finding materials capable of broad EL color tuning remains challenging. Herein, we report the observation of broad voltage-tunable EL in colloidal type-II InP/ZnS quantum-dot-seeded CdS tetrapod (TP) LEDs. The EL color can be tuned from red to bluish white by varying the red and blue emission intensities from type-II interfaces and arms, respectively. The capacitor device proves that an external electric field can enhance the color tuning in type-II TPs. COMSOL simulations, numerical calculations, and transient absorption measurements are performed to understand the underlying photophysical mechanism. Our results indicate that the reduced hole relaxation rate from the arm to the quantum dot core can enhance the emission from the CdS arms, which is favorable for EL color tuning. This study provides a novel method to realize voltage-tunable EL colors with potential in display and micro-optoelectronic applications.

Original languageEnglish
Pages (from-to)5705-5712
Number of pages8
JournalNano Letters
Volume23
Issue number12
DOIs
Publication statusPublished - 28 Jun 2023

Keywords

  • carrier dynamics
  • colloidal nanostructures
  • EL color tuning
  • type-II band alignment

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering

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