Related Experiment Video
Updated: Feb 4, 2026

Author Spotlight: Eco-friendly Photoluminescent Textile Authentication with Curcumin
Published on: December 22, 2023
Blue or red photoluminescence emission in α-Bi2 O3 needles: Effect of synthesis method
Samara Schmidt1, Evaldo T Kubaski2, Máximo Siu Li3
1Department of Production Engineering, Federal University of Technology - Paraná (UTFPR), Av. Monteiro Lobato km 04, Ponta Grossa, PR, Brazil.
Abstract:
Monoclinic bismuth oxide (α-Bi2 O3 ) 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-Bi2 O3 still requires research. This paper describes the influence of precipitation (PPT) and microwave-assisted hydrothermal (MAH) methods on PL properties of acicular α-Bi2 O3 microcrystals. The synthesis method promoted structural modifications on α-Bi2 O3 , 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-Bi2 O3 by simply choosing the adequate synthesis method.
Related Concept Videos
Photoluminescence: Applications
Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction
Emission Spectra
Photoluminescence: Fluorescence and Phosphorescence
A pair of electrons in a...
Red Algae
Dehydration Synthesis
Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
Synthesis of carbohydrates
Sugar molecules are covalently linked together by dehydration synthesis. During the reaction, the hydroxyl (-OH) group from...

