Luminescence Quenching Behavior of Hydrothermally Grown YVO4:Eu3+ Nanophosphor Excited under Low Temperature and Vacuum Ultra Violet Discharge

Abstract

The luminescence quenching behavior and energy transfer process in hydrothermally grown Eu3+-doped YVO4 nanophosphors were studied using low temperature photoluminescence spectroscopy. The luminescence efficiency of nanophosphor is dependent on the acidity of its solution media and the post annealing condition after hydrothermal processing. The overall results suggest that the abnormal luminescence behavior of Eu3+-doped nanocrystalline YVO4 under low temperature photoexcitation is due to the incorporated non-radiative hydroxyl groups often encountered in hydrothermal synthesis as well as to the inefficient energy transfer to luminescent ions from vanadate groups.

Enhanced Fluorescence and Environmental Stability of Red-Emissive Carbon Dots via Chemical Bonding with Cellulose Films

“…In previous research, carboxyl groups have been confirmed to be present at the surface of carbon dots. And the long-wavelength emissions of carbon dots have been referred to as the carboxyl-related surface states. , Indeed, the oxygen-containing groups are generally known as the luminescent quenching centers due to a competing transition probability between the activator and the surface recombination centers such as hydroxyl groups, , which provided nonradiative pathways that caused fluorescence quenching . Therefore, the oxidation of surface groups created in the open air led to the generation of nonradiative defect states, where the surface-state emission was suppressed.…”