Time-resolved study of self-trapped exciton luminescence in anatase TiO2 under two-photon excitation

Watanabe, Masayuki; Hayashi, Tetsusuke

doi:10.1016/j.jlumin.2004.09.001

Cited by 69 publications

(45 citation statements)

References 8 publications

(16 reference statements)

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“…70͔͒. Moreover, a strong exciton-phonon interaction has been observed 52,55,[70][71][72][73] in this compound. The lowest-energy excitonic transitions reported for both phases are indeed due to indirect processes, involving phonon contributions.…”

Section: Introductionmentioning

confidence: 59%

“…In the case of TiO 2 , it has been attributed to exciton self-trapping, 55,73,109 i.e., the localization of exciton through phonon coupling. It is favored to occur in anatase with respect to rutile because of the lower coordination between octahedra.…”

Section: Analysis Of Excitonic Transitionsmentioning

confidence: 99%

“…This stronger localization probably supports the possibility of experimentally reported self-trapping. 55,73,109 The behavior of excitons in anatase have indeed also been modeled within a Franck-Condon model including twodimensional-exciton transitions. 110 For rutile, the more delocalized distribution of the excitonic wave functions can be connected with the observed 111 low electron-hole recombination rates in this phase.…”

Section: Analysis Of Excitonic Transitionsmentioning

confidence: 99%

“…A further complication arises from the presence of self-trapping phenomena. 52,55,[70][71][72][73] The exciton creation induces a local ionic relaxation which traps the exciton, localizing it. The copresence of these various effects: polaronic screening, 70 electron-phonon coupling, defects and oxygen vacancies, produces an absorption edge lower in energy than for the direct excitons.…”

Section: Introductionmentioning

confidence: 99%

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Self-energy and excitonic effects in the electronic and optical properties ofTiO2crystalline phases

et al. 2010

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We present a unified ab initio study of electronic and optical properties of TiO 2 rutile and anatase phases with a combination of density-functional theory and many-body perturbation-theory techniques. The consistent treatment of exchange and correlation, with the inclusion of many-body one-particle and two-particles effects in self-energy and electron-hole interaction, produces a high-quality description of electronic and optical properties, giving, for some quantities, the first available estimation for this compound. In particular, we give a quantitative estimate of the electronic and direct optical gaps, clarifying their role with respect to previous measurements obtained by various experimental techniques. We obtain a description for both electronic gap and optical spectra that is consistent with experiments by analyzing the role of different contributions to the experimental optical gap and relating them to the level of theory used in our calculations. We also show the spatial properties of excitons in the two crystalline phases, highlighting the localization character of different optical transitions. This paper aims at understanding and firmly establishing electro-optical bulk properties, yet to be clarified, of this material of fundamental and technological interest for green energy applications.

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Section: Introductionmentioning

confidence: 59%

Section: Analysis Of Excitonic Transitionsmentioning

confidence: 99%

Section: Analysis Of Excitonic Transitionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Self-energy and excitonic effects in the electronic and optical properties ofTiO2crystalline phases

et al. 2010

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“…Excitons in A are generally thought to be 'self-trapped' [101,110,114,118,119,167,[376][377][378][379][380][381][381][382][383][384]. Exciton self-trapping in A stems from a large lattice relaxation in the excitonic state that hinders quenching or charge separation [110].…”

Section: Exciton Transport and Trappingmentioning

confidence: 99%

A surface science perspective on TiO2 photocatalysis

Henderson

2011

Surface Science Reports

1,832

1,607

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a b s t r a c tThe field of surface science provides a unique approach to understanding bulk, surface and interfacial phenomena occurring during TiO 2 photocatalysis. This review highlights, from a surface science perspective, recent literature that provides molecular-level insights into photon-initiated events occurring at TiO 2 surfaces. Seven key scientific issues are identified in the organization of this review. These are: (1) photon absorption, (2) charge transport and trapping, (3) electron transfer dynamics, (4) the adsorbed state, (5) mechanisms, (6) poisons and promoters, and (7) phase and form. This review ends with a brief examination of several chemical processes (such as water splitting) in which TiO 2 photocatalysis has made significant contributions in the literature.

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