Luminescence regulation of lanthanide-doped nanorods in chiral photonic cellulose nanocrystal films

Int J Biol Macromol. 2023 Jan 15:225:1172-1181. doi: 10.1016/j.ijbiomac.2022.11.178. Epub 2022 Nov 19.

Abstract

A new design for chiral photonic cellulose nanocrystal films was developed by co-assembling lanthanide-doped nanorods (NRs) into chiral cellulose nanocrystals, in which the photonic band gap (PBG) could be tuned in the visible range by changing the mass fraction of flexible agents, such as polyvinyl alcohol (PVA) and ethylene glycol (EG). Due to the PBG effect, the luminescence modulation in such nanocrystal films had been realized. The down-conversion luminescence from NaGd30Y60F4:5%Tb3+, 5%Eu3+ NRs and up-conversion luminescence from NaGd40Y40F4:18%Yb3+, 2%Er3+ NRs could be enhanced by 28 % and 18 % respectively, on account of the band edge effect. The luminescence would be inhibited when the luminescence overlapped with the stop band of the PBG. These results implied that the biocompatible photonic cellulose nanocrystal films are ideally suited for applications in optical coding, optical resonators and biocompatible lasers.

Keywords: Cellulose; Lanthanide; Luminescence regulation; Photonic crystal.

MeSH terms

  • Cellulose / chemistry
  • Lanthanoid Series Elements*
  • Luminescence
  • Nanoparticles* / chemistry
  • Nanotubes* / chemistry

Substances

  • Lanthanoid Series Elements
  • Cellulose