Photoluminescence in nanocrystalline BaTiO3 and SrTiO3

Jin, Meng; Huang, Yabin; Zhang, Weifeng; Du, Zuliang; Zhu, Z. Q.; Zou, Guangtian

doi:10.1016/0375-9601(95)00533-9

Cited by 89 publications

(55 citation statements)

References 25 publications

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“…16,17 In nanocrystalline ST, PL has been detected at room temperature and with excitation energies below the energy band gap. [18][19][20][21] The visible emission was attributed to STEs and was correlated not only to the intrinsic surface states and defect centers via a strong electron-phonon interaction but also to particle sizes.…”

Section: Introductionmentioning

confidence: 99%

Structural conditions that leads to photoluminescence emission in SrTiO3: An experimental and theoretical approach

Longo

Figueiredo

Lázaro

et al. 2008

Journal of Applied Physics

154

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• ͒ vacancies were identified in disordered SrTiO 3 powders prepared by the polymeric precursor method, based on experimental measurements by x-ray absorption near edge structure spectroscopy. The paramagnetic complex states of ͓TiO 5 · V O • ͔ and ͓SrO 11 · V O • ͔ with unpaired electrons were confirmed by electron paramagnetic resonance spectroscopy. The disordered powders showed strong photoluminescence at room temperature. Structural defects of disordered powders, in terms of band diagram, density of states, and electronic charges, were interpreted using high-level quantum mechanical calculations in the density functional framework. The four periodic models used here were consistent with the experimental data and explained the presence of photoluminescence.

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Section: Introductionmentioning

confidence: 99%

Structural conditions that leads to photoluminescence emission in SrTiO3: An experimental and theoretical approach

Longo

Figueiredo

Lázaro

et al. 2008

Journal of Applied Physics

154

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“…Much interest has been paid in the study of PL in structurally disordered or nanostructured materials since the first time visible PL at room temperature was observed in porous silicon. 1 The PL at low temperatures of crystalline ABO 3 perovskite has long been known and recent studies attest for the current interest in those semiconducting compounds, [2][3][4] owing to their wide variety of unique electronic, magnetic, and optical properties. 5,6 Much attention has also been paid on BaTiO 3 ͑BT͒ crystal samples, particularly since it was discovered that, when pure BT crystal samples are excited by radiation above their energy band gap, a broad visible luminescent band appears at low temperatures ͑45 K͒.…”

Section: Introductionmentioning

confidence: 99%

“…This PL has been attributed to the size of the particles and to the presence of oxygen vacancies in the lattice. 2,9,10 Our group reported intense visible PL at room temperature in ATiO 3 powders and thin-film compounds ͑where A = Pb, Ca, Sr, and Ba͒, independently of the size of the grains, but depending on the rate of crystalline disorder existing in the compounds, opening up an interesting field of research for this class of materials. [11][12][13][14] In this paper, we present measurements of broad PL band at room temperature as a function of heat treatment of BaTiO 3 powder prepared by the polymeric precursor method.…”

Section: Introductionmentioning

confidence: 99%

Room-temperature photoluminescence ofBaTiO3: Joint experimental and theoretical study

et al. 2005

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Strong photoluminescent emission has been measured at room temperature for noncrystalline BaTiO 3 ͑BT͒ perovskite powders. A joint experimental and theoretical study has been carried out to rationalize this phenomenon. From the experimental side, BT powder samples have been synthesized following a soft chemical processing, their crystal structure has been confirmed by x-ray data and the corresponding photoluminescence ͑PL͒ properties have been measured. Only the structurally disordered samples present PL at room temperature. From the theoretical side, first-principles quantum-mechanical techniques, based on density-functional theory at the B3LYP level, have been employed to study the electronic structure of crystalline ͑BT-c͒ and asymmetric ͑BT-a͒ models. Theoretical and experimental results are found to be consistent and their confrontation leads to an interpretation of the PL apparition at room temperature in the structurally disordered powders.

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“…[6][7][8] For example, Eglitis et al 9 demonstrated very recently through semiempirical quantum chemical calculations that the origin of the intrinsic excitonic ͑''green''͒ luminescence of ABO 3 perovskites at low temperature is linked to the recombination of electrons and hole polarons forming a charge transfer vibronic exciton ͑CTVE͒.…”

Section: Introductionmentioning

confidence: 99%

Density functional theory calculation of the electronic structure ofBa0.5Sr0.5TiO
Longo
¹
,
Orhan
²
,
Pontes
³

et al. 2004
Phys. Rev. B
102
5
51
0
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First-principles quantum-mechanical techniques, based on density functional theory ͑B3LYP level͒ were employed to study the electronic structure of ordered and deformed asymmetric models for Ba 0.5 Sr 0.5 TiO 3 . Electronic properties are analyzed and the relevance of the present theoretical and experimental results on the photoluminescence behavior is discussed. The presence of localized electronic levels in the band gap, due to the symmetry break, would be responsible for the visible photoluminescence of the amorphous state at room temperature. Thin films were synthesized following a soft chemical processing. Their structure was confirmed by x-ray data and the corresponding photoluminescence properties measured.

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Photoluminescence in nanocrystalline BaTiO3 and SrTiO3

Cited by 89 publications

References 25 publications

Structural conditions that leads to photoluminescence emission in SrTiO3: An experimental and theoretical approach

Structural conditions that leads to photoluminescence emission in SrTiO3: An experimental and theoretical approach

Room-temperature photoluminescence ofBaTiO3: Joint experimental and theoretical study

Density functional theory calculation of the electronic structure ofBa0.5Sr0.5TiO
Longo
¹
,
Orhan
²
,
Pontes
³

et al. 2004
Phys. Rev. B
102
5
51
0
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Photoluminescence in nanocrystalline BaTiO3 and SrTiO3

Cited by 89 publications

References 25 publications

Structural conditions that leads to photoluminescence emission in SrTiO3: An experimental and theoretical approach

Structural conditions that leads to photoluminescence emission in SrTiO3: An experimental and theoretical approach

Room-temperature photoluminescence ofBaTiO3: Joint experimental and theoretical study

Density functional theory calculation of the electronic structure ofBa0.5Sr0.5TiOLongo1, Orhan2, Pontes3 et al. 2004Phys. Rev. B1025510View full textAdd to dashboardCite

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About

Density functional theory calculation of the electronic structure ofBa0.5Sr0.5TiO
Longo
¹
,
Orhan
²
,
Pontes
³

et al. 2004
Phys. Rev. B
102
5
51
0
View full text Add to dashboard Cite