Tungsten trioxide (WO3) has a certain absorption capacity in the visible light region, which makes it potential in visible light absorbing materials and photocatalytic applications. Although the energy band structure of tungsten trioxide limits its band gap to the ultraviolet region, it can still partially absorb visible light and participate in photochemical reactions. Here are some key points about the visible light absorption of tungsten trioxide:
Direct Bandgap Absorption Of Tungsten Trioxide Visible Light
The bandgap of tungsten trioxide is in the ultraviolet region, but it can still partially absorb visible light through the mechanism of direct bandgap absorption. Although the absorption coefficient is relatively low, a portion of visible light can still be absorbed and excite electrons to transition from the valence band to the conduction band.
Tungsten Trioxide Visible Light Defect Absorption
Various lattice and surface defects exist in tungsten trioxide, which can introduce energy levels and enhance visible light absorption. For example, defects such as oxygen vacancies and tungsten vacancies can extend the absorption range of tungsten trioxide to the visible region.
Tungsten Trioxide Visible Light Doping Control
By doping other ions or compounds, the absorption properties of tungsten trioxide can be tuned. The doping of some metal ions (such as copper, iron, chromium) or oxides can introduce energy levels or change the energy band structure, thereby enhancing the absorption of visible light.
Tungsten Trioxide Visible Light Composite Material
Combining tungsten trioxide with other materials can also enhance its ability to absorb visible light. Combining tungsten trioxide with semiconductor quantum dots, organic dyes or other light-absorbing materials can expand its absorption range and improve absorption efficiency.
It should be noted that although tungsten trioxide has a certain absorption capacity in the visible range, its absorption efficiency is generally low. Therefore, in practical applications, methods such as material design, structure optimization, and absorption enhancement strategies are still needed to improve their absorption capacity for visible light in order to achieve more efficient photocatalysis and photoelectric conversion applications.
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