Mixed Spacer Cation Stabilization of Blue-Emitting n = 2 Ruddlesden–Popper Organic–Inorganic Halide Perovskite Films

Tik Lun Leung, Ho Won Tam, Fangzhou Liu, Jingyang Lin, Alan Man Ching Ng, Wai Kin Chan, Wei Chen, Zhubing He, Ivor Lončarić, Luca Grisanti, Chao Ma, Kam Sing Wong, Ying Suet Lau, Fu Rong ZHU, Željko Skoko, Jasminka Popović*, Aleksandra B. Djurišić

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Ruddlesden–Popper halide perovskite (RPP) materials are of significant interest for light-emitting devices since their emission wavelength can be controlled by tuning the number of layers n, resulting in improved spectral stability compared to mixed halide devices. However, RPP films typically contain phases with different n, and the low n phases tend to be unstable upon exposure to humidity, irradiation, and/or elevated temperature which hinders the achievement of pure blue emission from n = 2 films. In this work, two spacer cations are used to form an RPP film with mixed cation bilayer and high n = 2 phase purity, improved stability, and brighter light emission compared to a single spacer cation RPP. The stabilization of n = 2 phase is attributed to favorable formation energy, reduced strain, and reduced electron–phonon coupling compared to the RPP films with only one type of spacer cation. Using this approach, pure blue light-emitting diodes (LEDs) with Commission Internationale de l'éclairage (CIE) coordinates of (0.156, 0.088) and excellent spectral stability are achieved.

Original languageEnglish
Article number1901679
JournalAdvanced Optical Materials
Volume8
Issue number4
DOIs
Publication statusPublished - 1 Feb 2020

Scopus Subject Areas

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

User-Defined Keywords

  • blue emission
  • perovskite light-emitting diodes
  • quasi-2D perovskites
  • Ruddlesden–Popper

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