Single-Layer Sheets of Alkylammonium Lead Iodide Perovskites with Tunable and Stable Green Emission for White Light-Emitting Devices

Chuying Wang, Ya Kun Wang, Ziliang Li, Jingwei Luo, Randy Sabatini, Tao Zhang, Edward H. Sargent, Zhengtao Deng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Recently, metal halide perovskites have attracted considerable interest as highly emissive phosphors for use in white light-emitting diodes (WLEDs). In perovskites, the migration of halide anions between green-emitting bromide (e.g., CsPbBr3) and red-emitting iodide (e.g., CsPbI3) materials is one obstacle to application. Here perovskite WLEDs that do not suffer from the anion exchange problem are reported: this is done by developing green-emitting single-layer sheets of (RNH3)2PbI4 (R = C18H35–, C12H25–, and C8H17–) and uniting these with red-emitting CsPbI3 perovskite quantum dots (QDs). It relies on self-assembly from ligand-capped CsPbI3 nanocrystals to form single-layer sheets of (C18H35NH3)2PbI4: via judicious selection of alkylamines and alkyl acids, (RNH3)2PbI4 single-layer sheets that exhibit bright and stable green emission with well-defined single-layer thickness are produced. Emission from 505, 512 to 536 nm is tuned and a narrow (<20 nm) linewidth is retained. Perovskite LEDs that produce white light with chromaticity coordinates (0.32, 0.33) and color gamut that reaches 117% National Television System Committee (NTSC) in the International Commission on Illumination (CIE) 1931 color space are demonstrated.

Original languageEnglish (US)
Article number2200217
JournalAdvanced Optical Materials
Volume10
Issue number16
DOIs
StatePublished - Aug 18 2022

Keywords

  • alkylammonium lead iodide perovskites
  • fluorescence
  • single-layer sheets
  • stability
  • white light emitting diodes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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