Polarized emission from unidirectionally oriented semiconductor nanorods in light-emitting devices

Do Joong Shin, Hyejeong Jang, Dahin Kim, Ju Young Woo, Young Kuk Lee, Wan Ki Bae, Jongwook Kim, Young Shin Park, Doh C. Lee

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Unidirectional ordering of colloidal semiconductor nanorods (NRs) is key to taking advantage of anisotropic optical properties of NRs in solid-state devices. In this study, we report long-range orientation of colloidal CdSe/CdS heterostructure NRs by spin coating a mixture of NRs and poly(9-vinylcarbazole) (PVK) molecules on an off-center position of a substrate. Addition of 1,2-dichlorobenzene slows the evaporation of solvent resulting in better orientation with contrast ratio of 2.5 in linear photoluminescence polarization and 2.0 in electroluminescence. Our calculation reveals that the stabilization of the NR assembly is likely a result of depletion energy during spin coating. The retarded evaporation enables the depletion interaction to come into play in the process of NR stacking, hence highly oriented and closely packed NR films. Our findings on unidirectionally assembled NRs in uniform film offer an insight for ordering of anisotropic colloidal nanoparticles.

Original languageEnglish
Article number156160
JournalApplied Surface Science
Volume614
DOIs
StatePublished - 30 Mar 2023

Keywords

  • Depletion interaction
  • Light-emitting diode
  • Linearly polarized emission
  • Long-range assembly
  • Semiconductor nanorods
  • Unidirectional orientation

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