Roles of Electrons and Holes in the Luminescence of Rare‐Earth‐Doped Semiconductors

Ishii, Masashi; Towlson, Brian; Harako, Susumu; Zhao, Xin; Komuro, Shuji; Hamilton, B.

doi:10.1002/ecj.11537

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…As described, the cationic doping essentially introduces the intra-band energy levels close to the CB of TiO 2 , which leads to the red shift in the optical property of the system and it is also observed in various cations such as transition metal, [61][62][63], rare-earth [64][65][66], and other metals [67][68][69] doped TiO 2 . However, the main drawback of the cation doping is the creation of more trapping sites for charge carriers (both electrons and holes) that considerably reduces the efficiency of the photocatalyst.…”

Section: Cationic Doping In Tiomentioning

confidence: 90%

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

2019

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Photocatalysis is a multifunctional phenomenon that can be employed for energy applications such as H2 production, CO2 reduction into fuels, and environmental applications such as pollutant degradations, antibacterial disinfection, etc. In this direction, it is not an exaggerated fact that TiO2 is blooming in the field of photocatalysis, which is largely explored for various photocatalytic applications. The deeper understanding of TiO2 photocatalysis has led to the design of new photocatalytic materials with multiple functionalities. Accordingly, this paper exclusively reviews the recent developments in the modification of TiO2 photocatalyst towards the understanding of its photocatalytic mechanisms. These modifications generally involve the physical and chemical changes in TiO2 such as anisotropic structuring and integration with other metal oxides, plasmonic materials, carbon-based materials, etc. Such modifications essentially lead to the changes in the energy structure of TiO2 that largely boosts up the photocatalytic process via enhancing the band structure alignments, visible light absorption, carrier separation, and transportation in the system. For instance, the ability to align the band structure in TiO2 makes it suitable for multiple photocatalytic processes such as degradation of various pollutants, H2 production, CO2 conversion, etc. For these reasons, TiO2 can be realized as a prototypical photocatalyst, which paves ways to develop new photocatalytic materials in the field. In this context, this review paper sheds light into the emerging trends in TiO2 in terms of its modifications towards multifunctional photocatalytic applications.

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Section: Cationic Doping In Tiomentioning

confidence: 90%

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

2019

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Influences of Doping on Photocatalytic Properties of TiO2 Photocatalyst

Huang¹,

Yan²,

Zhao³

2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

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As a kind of highly effective, low-cost, and stable photocatalysts, TiO 2 has received substantial public and scientific attention. However, it can only be activated under ultraviolet light irradiation due to its wide bandgap, high recombination, and weak separation efficiency of carriers. Doping is an effective method to extend the light absorption to the visible light region. In this chapter, we will address the importance of doping, different doping modes, preparation method, and photocatalytic mechanism in TiO 2 photocatalysts. Thereafter, we will concentrate on Ti 3+ self-doping, nonmetal doping, metal doping, and codoping. Examples of progress can be given for each one of these four doping modes. The influencing factors of preparation method and doping modes on photocatalytic performance (spectrum response, carrier transport, interfacial electron transfer reaction, surface active sites, etc.) are summed up. The main objective is to study the photocatalytic processes, to elucidate the mechanistic models for a better understanding the photocatalytic reactions, and to find a method of enhancing photocatalytic activities.

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Roles of Electrons and Holes in the Luminescence of Rare‐Earth‐Doped Semiconductors

Cited by 2 publications

References 12 publications

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

Influences of Doping on Photocatalytic Properties of TiO2 Photocatalyst

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