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Blue or red photoluminescence emission in α‐Bi 2 O 3 needles: Effect of synthesis method
Author(s) -
Schmidt Samara,
Kubaski Evaldo T.,
Li Máximo Siu,
Bezzon Vinicius D.N.,
Sequinel Thiago,
Tebcherani Sergio M.
Publication year - 2018
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3547
Subject(s) - photoluminescence , bismuth , monoclinic crystal system , materials science , acicular , hydrothermal synthesis , coprecipitation , hydrothermal circulation , analytical chemistry (journal) , oxide , mineralogy , chemical engineering , nanotechnology , inorganic chemistry , optoelectronics , chemistry , crystal structure , crystallography , metallurgy , microstructure , environmental chemistry , engineering
Abstract Monoclinic bismuth oxide (α‐Bi 2 O 3 ) has attractive optical properties and, therefore, its photoluminescence (PL) behavior has been increasingly explored. Besides this fact, the influence of synthesis methods on PL properties of α‐Bi 2 O 3 still requires research. This paper describes the influence of precipitation (PPT) and microwave‐assisted hydrothermal (MAH) methods on PL properties of acicular α‐Bi 2 O 3 microcrystals. The synthesis method promoted structural modifications on α‐Bi 2 O 3 , in particular PPT increased the density of oxygen vacancies significantly. As a result, the PL properties of samples were different depending on the method of synthesis. PPT samples presented their maximum PL emission at 1.91 eV (red), while MAH samples had their maximum at 2.61 eV (blue). These results indicate the possibility of controlling PL properties of α‐Bi 2 O 3 by simply choosing the adequate synthesis method.