Pulsed-Laser-Induced Simple Synthetic Route for Tb3Al5O12:Ce3+Colloidal Nanocrystals and Their Luminescent Properties

Abstract

Cerium-doped Tb3Al5O12(TAG:Ce3+) colloidal nanocrystals were synthesized by pulsed laser ablation (PLA) in de-ionized water and lauryl dimethylaminoacetic acid betain (LDA) aqueous solution for luminescent bio-labeling application. The influence of LDA molecules on the crystallinity, crystal morphology, crystallite size, and luminescent properties of the prepared TAG:Ce3+colloidal nanocrystals was investigated in detail. When the LDA solution was used, smaller average crystallite size, narrower size distribution, and enhanced luminescence were observed. These characteristics were explained by the effective role of occupying the oxygen defects on the surface of TAG:Ce3+colloidal nanocrystal because the amphoteric LDA molecules were attached by positively charged TAG:Ce3+colloidal nanocrystals. The blue-shifted phenomena found in luminescent spectra of the TAG:Ce3+colloidal nanocrystals could not be explained by previous crystal field theory. We discuss the 5d energy level of Ce3+with decreased crystal size with a phenomenological model that explains the relationship between bond distance with 5d energy level of Ce3+based on the concept of crystal field theory modified by covalency contribution.

Luminescence investigations of Ce3+ doped CaS nanophosphors

“…These comparisons are listed in Table 1. The blue-shifting of Ce 3+ emission peaks in a cubic nanocrystal structure could be explained by the modified crystal field model proposed by Mhin et al [25]. According to this model, as the crystal sizes decrease to nanoscale the bond distance between Ce 3+ and Fig.…”

Rare‐earth Based Insulating Nanocrystals: Improved Luminescent Nanophosphors for Plasma Display Panels

“…The degree to which they are influenced depends also on the size and shape of nanostructures [34,35]. Recently, Y. Lin et al [36] reported preparation of the ultrafine SrAl 2 0 4 :Eu, Dy needle-like phosphor and its optical properties.…”

Thin Film Deposition of Tb3Al5O12:Ce by Pulsed Laser Ablation and Effects of Low-temperature Post-annealing

“…The PL excitation spectrum of the postannealed TAG:Ce thin films showed two bands peaking at 335 (weak) and 450 nm (strong) due to the transitions from 4f 1 ground state to higher level of 5d 1 configuration. The broad emission spectra centered at 542 nm correspond to the well-known transition from the lowest 5d1 (2D) configuration to the unresolved ground states 4f1 ( 2 F5/2,7/2) of the Ce ion in TAG crystal [18].…”