ABSTRACT
Under 975 nm excitation, the Tm3+/Yb3+/W6+, Ho3+/Yb3+/W6+, and Er3+/Yb3+/W6+ doped ZrO2 nanoparticles can emit single-colour up-conversion luminescence with high purity. The colour-purity of the three samples are 82%, 93% and 97%, respectively. The strong single-colour up-conversion emission is due to the Yb3+-[WO4]2− dimer. The energy transfers of GSA(|2F7/2, 1A1>→|2F5/2, 1A1>) and ESA(|2F5/2, 1A1>→|2F7/2, 1T1/1T2>) play a key role in the up-conversion population processes. The research will be helpful for luminescence labelling, luminescence imaging and colour display domains.
Disclosure statement
No potential conflict of interest was reported by the author(s).