Photoluminescence properties of Tb3+ and Eu3+ ions hosted in TiO2 matrix

Conde-Gallardo, A.; García‐Rocha, M.; Palomino-Merino, R.; Velásquez-Quesada, M.P; Hernández‐Calderón, I.

doi:10.1016/s0169-4332(03)00131-4

Cited by 44 publications

(28 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of X-ray diffraction and Raman spectroscopy will show the influence of the Tb dopant upon the structure of as-deposited films. In contrast to the examples presented in the literature [6,11,12,[14][15][16], the PL effect will be observed only in nanocrystalline TiO 2 :(2.6 at. % Tb) film with rutile structure, while presence of the anatase form or the two-phase system (anatase-rutile) will not favour the occurrence of this phenomenon.…”

Section: Introductioncontrasting

confidence: 80%

“…However, emission of the light is weak [12,13] and the reason for the direct excitation process of Tb 3+ ions in titania host was not precisely described. So far, a PL effect was obtained for thin films with an anatase structure [6,11,13,14] or amorphous ones [10,16]. In the case of TiO 2 films with a rutile structure, this phenomenon was presented only in our previous work [17].…”

Section: Introductionmentioning

confidence: 89%

See 1 more Smart Citation

Influence of terbium on structure and luminescence of nanocrystalline TiO2 thin films

et al. 2013

View full text Add to dashboard Cite

Abstract:In this work analysis of the structural and optical properties of TiO 2 thin films doped with terbium has been described. Samples were prepared by a high energy reactive magnetron sputtering process under low pressure of oxygen plasma. X-ray diffraction results have shown that different TiO 2 crystal forms have been produced, depending on the amount of Tb dopant. The undoped matrix had rutile structure with crystallites with a size of 8.7 nm, while incorporation of 0.4 at. % of Tb into the film during the sputtering process resulted in anatase structure with bigger crystallites (11.7 nm). Increasing the amount of terbium up to 2 at. % and 2.6 at. % gave rutile structure with crystallites with a size of 6.6 nm for both films. However, Raman spectroscopy has revealed that in the case of TiO 2 :(2 at. % Tb), except for the rutile form, the presence of fine-crystalline anatase was observed. Moreover, the lack of Raman peaks shift attests to the lack of stress in the titania lattice of all of the TiO 2 :Tb films. This fact indicates localization of Tb 3+ ions on the surface of TiO 2 nanocrystals. In the case of optical investigation, results have shown that doping with terbium has a significant influence on the properties of TiO 2 , but it does not decrease the high transparency of the matrix. The observed changes of the transmission characteristics were produced only due to modification of the TiO 2 :Tb structure. Photoluminescence measurements have shown that emission of light from TiO 2 :Tb films occurs when the amount of terbium is 2.6 at. %. Based on the obtained results a scheme of direct energy transfer from titanium dioxide matrix (with rutile structure) to Tb 3+ ions has been proposed.

show abstract

Section: Introductioncontrasting

confidence: 80%

Section: Introductionmentioning

confidence: 89%

Influence of terbium on structure and luminescence of nanocrystalline TiO2 thin films

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Eu 3+ doping in TiO 2 has been carried out by several researchers in order to achieve an improved luminescence of Eu 3+ by energy transfer from TiO 2 to Eu 3+ . Luminescence from nanoparticles and thin films of Eu 3+ doped TiO 2 showed the enhanced emission for samples heated below 400 • C, whereas for samples heated at higher than 400 • C, luminescence was found to decrease or even completely disappear at 900 • C [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Different groups have suggested diverse explanations for this behavior.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence studies on Eu doped TiO2 nanoparticles

Ningthoujam

Sudarsan

Vatsa

et al. 2009

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…When considering 700 • C patterns, it is obvious that only the (Y 1−x Gd x ) 2 O 3 phase is present. Even though neither trace of TiO 2 nor Ti-related phases were found, there should exist amorphous anatase phases, since the temperature was high enough for them [6][7][8]. A more interesting finding is that, even though the presence of TiO 2 or Ti-related phases was not confirmed by XRD, we are certain that the Ti involvement did play a definite role in enhancing the luminance at the 400 nm excitation because the luminance of Ti-rich samples (samples 1-3) was much higher than Ti-poor samples at the 400 nm excitation.…”

Section: Resultsmentioning

confidence: 99%

“…TiO 2 could be a possible candidate among those which have been known to exhibit an absorption band in the soft UV range, because TiO 2 has served as a photonic catalyst in this energy range. Recently Eu 3+ doped TiO 2 has been developed, so that a possibility of being used as a red phosphor could be examined [4][5][6][7][8]. However, the luminescent efficiency of this material is too low from the practical point of view.…”

Section: Introductionmentioning

confidence: 99%