Characterization of Point Defects in Photorefractive Oxide Crystals by Paramagnetic Resonance Methods

Schirmer, O. F.; Reyher, H.-J.; Wöhlecke, M.

doi:10.1142/9789812813015_0004

Cited by 13 publications

(20 citation statements)

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“…Different models have been proposed and discussed to understand the defective structure of reduced LiNbO 3 samples. A very authoritative and elaborated study of those models is given in [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

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Real-Time Identification of Oxygen Vacancy Centers in LiNbO3 and SrTiO3 during Irradiation with High Energy Particles

et al. 2021

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Oxygen vacancies are known to play a central role in the optoelectronic properties of oxide perovskites. A detailed description of the exact mechanisms by which oxygen vacancies govern such properties, however, is still quite incomplete. The unambiguous identification of oxygen vacancies has been a subject of intense discussion. Interest in oxygen vacancies is not purely academic. Precise control of oxygen vacancies has potential technological benefits in optoelectronic devices. In this review paper, we focus our attention on the generation of oxygen vacancies by irradiation with high energy particles. Irradiation constitutes an efficient and reliable strategy to introduce, monitor, and characterize oxygen vacancies. Unfortunately, this technique has been underexploited despite its demonstrated advantages. This review revisits the main experimental results that have been obtained for oxygen vacancy centers (a) under high energy electron irradiation (100 keV–1 MeV) in LiNbO3, and (b) during irradiation with high-energy heavy (1–20 MeV) ions in SrTiO3. In both cases, the experiments have used real-time and in situ optical detection. Moreover, the present paper discusses the obtained results in relation to present knowledge from both the experimental and theoretical perspectives. Our view is that a consistent picture is now emerging on the structure and relevant optical features (absorption and emission spectra) of these centers. One key aspect of the topic pertains to the generation of self-trapped electrons as small polarons by irradiation of the crystal lattice and their stabilization by oxygen vacancies. What has been learned by observing the interplay between polarons and vacancies has inspired new models for color centers in dielectric crystals, models which represent an advancement from the early models of color centers in alkali halides and simple oxides. The topic discussed in this review is particularly useful to better understand the complex effects of different types of radiation on the defect structure of those materials, therefore providing relevant clues for nuclear engineering applications.

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Section: Introductionmentioning

confidence: 99%

“…of reduced LiNbO3 samples. A very authoritative and elaborated study of those models is given in [29][30][31]. The defective structure strongly depends on the details of the thermal treatments and the surrounding (reducing) atmosphere and is not the objective of the present work.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Identification of Oxygen Vacancy Centers in LiNbO3 and SrTiO3 during Irradiation with High Energy Particles

et al. 2021

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“…Il convient de garder à l'esprit que tous ces dessins sont des représentations schématiques qui ne rendent que très partiellement compte de la complexité des processus de transfert de charge [21]. En effet, généralement plusieurs types de centres profonds et superficiels existent.…”

Section: Présentation Du Modèleunclassified

“…Dans un tel échantillon, de multiples niveaux énergétiques existent [21][22][23]. Nous n'avons représenté sur la figure 3.a que les principaux niveaux d'énergie électroniques.…”

Section: Présentation Du Modèleunclassified

L'effet photoréfractif

Pauliat

Roosen

1998

l'Optique Non Linéaire Et Ses Matériaux

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Résumé : La souplesse d'emploi des matériaux photoréfractifs est un de leurs principaux attraits. Un même échantillon est sensible sur une plage de longueurs d'onde de plus de 100 nm avec des temps de réponse s'étageant de moins d'une nanoseconde à plus d'une seconde en fonction de la puissance optique mise en jeu. Cette richesse explique le succès de l'effet photoréfractif et aussi les centaines de publications annuelles sur ce sujet. De nombreux matériaux photoréfractifs aux caractéristiques très diverses sont disponibles commercialement. Bien qu'il ne soit pas possible de résumer ici l'ensemble de ces résultats, nous présentons les notions indispensables à la compréhension de ce phénomène nonlinéaire, à l'utilisation de ces matériaux, et au choix des échantillons. Nous n'abordons pas le vaste domaine des applications.

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“…Among such crystals the Lithium Niobate (LN) is one of the most known, interesting and promising for both fundamental science and applications [1,2,3]. Conventional LN crystals, grown from a congruent melt with lithium deficiency (X melt = X Crystal ≈ 48.4%, where X = [Li]/([Li]+[Nb]), contain some percent of intrinsic (nonstoichiometric) defects.…”

Section: Introductionmentioning

confidence: 99%

Nonstoichiometry as a powerful tool for photorefractive material optimization. Lithium Niobate Crystals

Malovichko

1999

Advances in Photorefractive Materials, Effects and Devices

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An analysis of our radiospectroscopic and optical data obtained on a great variety of LiNbO 3 crystals of different compositions stimulated us to develop a new approach to the intrinsic and extrinsic defect subsystems, considering them as one integrated functional system. Their strong interrelation becomes especially apparent when concentrations of both defect classes are comparable. Typical examples of mutual influence and correlation of subsystems are demonstrated. Crystals with extremely low intrinsic defect contents offer extraordinary informative opportunities. Since both defect subsystems can be used for a deliberate tailoring of properties, nonstoichiometric materials are especially promising for crystal engineering. The developed ideas are also valid for other photorefractive materials.

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Characterization of Point Defects in Photorefractive Oxide Crystals by Paramagnetic Resonance Methods

Cited by 13 publications

References 0 publications

Real-Time Identification of Oxygen Vacancy Centers in LiNbO3 and SrTiO3 during Irradiation with High Energy Particles

Real-Time Identification of Oxygen Vacancy Centers in LiNbO3 and SrTiO3 during Irradiation with High Energy Particles

L'effet photoréfractif

Nonstoichiometry as a powerful tool for photorefractive material optimization. Lithium Niobate Crystals

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