Photon-Avalanche Effect of Y₂O₃:Er,Yb Nanoparticles Prepared by Laser Ablation in Liquid

Abstract

Optical properties of upconversion nanoparticles Y 2 O 3 :Er,Yb were investigated. The upconversion nanoparticles were prepared by laser ablation in liquid, which was one of the promising plasma processes to fabricate nanoparticle-dispersed solution. Highly crystalline nanoparticles with particle size of 11±3 nm were observed by electron microscope. Upconversion spectra with an excitation of 980 nm were measured by fluorescence spectrophotometer. Photon-avalanche effect of the nanoparticles, which significantly increased upconversion intensity, was observed. This phenomenon would be due to the increase in population at red emission by cross-relaxation. The ratio of red emission to green one was increased by the increase in the concentration of Yb in phosphor and the decrease in the excitation power.

Surface modification of Y2O3:Er,Yb upconversion nanoparticles prepared by laser ablation in water

“…[26][27][28][29] By using this method for ceramics materials such as doped phosphor, highly crystalline multielement nanoparticles can be obtained. [30][31][32][33] In this study, laser ablation in liquid was applied to the preparation of Y 2 O 3 :Er,Yb nanoparticles capped with PEG. The optical properties were studied.…”