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Direct Imaging of Light Emission Centers in Two‐Dimensional Crystals and Their Luminescence and Photocatalytic Properties
Author(s) -
Ida Shintaro,
Koga Shota,
Daio Takeshi,
Hagiwara Hidehisa,
Ishihara Tatsumi
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201406638
Subject(s) - photoluminescence , nanocrystal , luminescence , materials science , dopant , photocatalysis , doping , quantum efficiency , quenching (fluorescence) , perovskite (structure) , photochemistry , nanosheet , nanotechnology , catalysis , optoelectronics , chemistry , crystallography , optics , fluorescence , physics , biochemistry
To fully understand the fundamental properties of light‐energy‐converting materials, it is important to determine the local atomic configuration of photofunctional centers. In this study, direct imaging of one‐ and two‐Tb‐atom emission centers in a two‐dimensional Tb‐doped Ca 2 Ta 3 O 10 nanocrystal was carried. The emission centers were located at the Ca sites in the perovskite structure, and no concentration‐based quenching was observed even when the emission centers were in close proximity to each other. The relative photoluminescence efficiency for green emission of the nanosheet suspension was 38.1 %. Furthermore, the Tb‐doped Ca 2 Ta 3 O 10 nanocrystal deposited co‐catalyst showed high photocatalytic activity for hydrogen production from water (quantum efficiency: 71 % at 270 nm). Tb 3+ dopants in the two‐dimensional crystal might have the potential to stabilize the charge separation state.