Open AccessFormation Process of Y2O3:Bi3+,Eu3+ Nanosheets from Hydroxide Precursor Nanosheets
Author(s) -
Takuya Matsunaga,
Yoshiki Iso,
Tetsuhiko Isobe
Publication year - 2021
Publication title -
ecs journal of solid state science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.488
H-Index - 51
eISSN - 2162-8777
pISSN - 2162-8769
DOI - 10.1149/2162-8777/ac2781
Subject(s) - materials science , hydroxide , chemical engineering , process (computing) , nanotechnology , computer science , engineering , operating system
We studied the formation of Y 2 O 3 :Bi 3+ ,Eu 3+ nanosheets from different Y 2 O 3 precursors to propose a mechanism for their formation. One limitation of solar cells is their low sensitivity to near-ultraviolet light, which may be improved by including a phosphor to convert near-ultraviolet light to visible light, which can be readily absorbed. An attractive phosphor for this role is Y 2 O 3 :Bi 3+ ,Eu 3+ ; however, it remains unclear how Y 2 O 3 :Bi 3+ ,Eu 3+ forms from Y 2 O 3 precursor nanosheets. Therefore, we studied the formation of Y 2 O 3 :Bi 3+ ,Eu 3+ nanosheets from Y 2 O 3 precursors fabricated under various conditions including different pH, base type, and autoclave duration. We found that single-crystalline Y 2 O 3 :Bi 3+ ,Eu 3+ nanosheets formed from Y 2 O 3 precursor nanosheets produced under suitable conditions. The Y 2 O 3 :Bi 3+ ,Eu 3+ nanosheets retained the crystallographic orientation of the precursor Y 2 O 3 nanosheets. The formation of these nanosheets did not require the presence of organic ligands. Our findings indicate that Y 2 O 3 :Bi 3+ ,Eu 3+ nanosheet formation involved anisotropic assembly of crystallized nanoparticles and a subsequent dissolution–recrystallization process. The Y 2 O 3 :Bi 3+ ,Eu 3+ nanosheets fabricated under certain conditions displayed absorption and emission properties suitable for use as solar converters.