2007
DOI: 10.1088/0957-4484/18/16/165703
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Modulation of the photoluminescence of SrTiO3(001) by means of fluorhydric acid etching combined with Ar+ion bombardment

Abstract: We report a method to modulate the photoluminescence (PL) of SrTiO3(001) at room temperature by fluorhydric (HF) acid etching and Ar+ ion bombardment. The PL of the virgin sample is in the blue/green range, which can be enhanced in intensity by a factor of 7.2 after being fully etched in HF acid with the peak shape being unchanged. Ar+ ion bombardment of SrTiO3 can blueshift the overall PL, and the peak maximum becomes centred at 403 nm. After fully etching the ion-bombarded sample in HF, the PL peak stays i… Show more

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Cited by 18 publications
(23 citation statements)
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“…2. The PL emission has been attributed to radiation transitions from the occupied states at or close to the bottom of conduction band of STO to the OVRD states [25][26][27]. When part of the OVRD states are occupied by electrons due to hydrogenation, the PL emission is expected to decrease until disappearing, just as shown by curves 2 and 3 in Fig.…”
Section: Methodsmentioning
confidence: 96%
See 1 more Smart Citation
“…2. The PL emission has been attributed to radiation transitions from the occupied states at or close to the bottom of conduction band of STO to the OVRD states [25][26][27]. When part of the OVRD states are occupied by electrons due to hydrogenation, the PL emission is expected to decrease until disappearing, just as shown by curves 2 and 3 in Fig.…”
Section: Methodsmentioning
confidence: 96%
“…However, after hydrogenation, two visible absorptions peaks are found: at 420 and 515 nm, respectively. These absorption peaks were suggested to result from intrinsic oxygen-vacancy related defect (OVRD) states of STO [25][26][27], which act as acceptors located near the top of valence band of STO as illustrated in the inset of Fig. 2.…”
Section: Methodsmentioning
confidence: 99%
“…Substitution of O ions by anions such as nitrogen ions has been considered as a promising method to narrow the band gaps of STO and TiO 2 [14][15][16][17]. Low-energy ion bombardments of solid surfaces have long been used to modify properties of materials [18][19][20][21][22]. It is known that the photocatalytic ability of TiO 2 depends strongly on its crystallographic structure [23], and the structure changes readily during the fabrication process.…”
Section: Introductionmentioning
confidence: 99%
“…The ion bombardment would create a large number of nanograins on the surface of the STO. 28 The SrO being very sensitive to HF attack, the etching process is likely to increase the amount of oxygenvacancy defects by dissolving the SrO on the lateral sides of these nanograins 28 thus raising the conduction band carrier density and hence the PL intensity. Figure 2 illustrates the changes in PL spectra of the irradiated and etched samples at various temperatures from 300 K down to 20 K. From panel (a), it can be seen that the intensity of all the PL peaks increases gradually on decreasing the temperature down to ∼100 K. A slight shift in the position of the blue peak towards higher wavelength can also be noticed on cooling.…”
Section: Resultsmentioning
confidence: 99%