期刊
OPTICAL MATERIALS
卷 34, 期 8, 页码 1419-1425出版社
ELSEVIER
DOI: 10.1016/j.optmat.2012.02.033
关键词
Titanium dioxide; Anatase; Rutile; Neodymium; Photoluminescence; Down shifting
资金
- Region Centre
- ST Microelectronics
- Foundazione Caritro (Trento)
Undoped and Nd-doped titanium dioxide anatase and rutile films have been grown by pulsed-laser deposition at 700 degrees C under 0.1 mbar O-2. By selecting adequate substrates, TiO2 films doped with 1,2 or 5 at.% Nd were grown and constituted with polycrystalline rutile, highly oriented (2 0 0) rutile film, or oriented (0 0 4) anatase. An UV to NIR photon conversion is evidenced in the films. Indeed, intense and well-resolved emission lines from Nd3+ have been observed upon excitation above the TiO2 bandgap at room temperature. The sensitised emission of Nd3+ is found to be much efficient in rutile than in anatase structure. Low temperature photoluminescence measurements lead to fine resolved peaks corresponding to the Nd3+ 4f transitions with different spectral characteristic according to the host matrix used. Photoluminescence dependence temperature evidences that the light emission from Nd3+ in anatase-based films is probably influenced by the presence of self-trapped excitons or by orbital interaction. Mechanisms of sensitisation host to Nd3+ are proposed for both matrixes. Finally, the Nd dopant concentration and the microstructure of TiO2 rutile films are found to affect the photoluminescence emission intensity. Rutile film (2 0 0) oriented is the most adapted host matrix to sensitise 1 at.% Nd3+ ions for an emission around 1064 nm making such Nd-doped layers interesting for photon conversion by down shifting process. (C) 2012 Elsevier B.V. All rights reserved.
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