Molten Salt Annealing Induced Upconversion Luminescence Enhancement in YPO 4 :Yb 3+ ,Er 3+ Nanocrystals
Abstract
Upconversion nanoparticles (UCNPs) typically suffer from low emission intensity and aggregation during conventional annealing. Herein, we demonstrate molten salt annealing (MSA) as an effective strategy to enhance the luminescence of hydrothermally synthesized YPO 4 :15%Yb 3+ ,2%Er 3+ nanocrystals. Optimized MSA at 900 °C for 2 h yielded a ∼700-fold emission enhancement over the hydrothermally synthesized nanocrystals and ∼2.5-fold improvement relative to conventional annealing while preserving the rod-like morphology. These results identify MSA as a promising approach for producing brighter UCNPs while overcoming particle growth during thermal processing.
Fields of Study & Subjects
Luminescence Properties of Advanced Materials
Solid State Laser Technologies
Radiation Detection and Scintillator Technologies
Publication details
- Journal / source
- ECS Journal of Solid State Science and Technology
- Volume
- 15
- Issue
- 3
- Pages
- 036001–036001
- Publication date
- 1 March 2026
- Language
- EN