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http://hdl.handle.net/10397/4209
| Title: | Time-resolved photoluminescence of barium titanate ultrafine powders | Authors: | Lu, SG Xu, ZK Chen, H Mak, CL Wong, KH Li, KF Cheah, KW |
Issue Date: | 15-Mar-2006 | Source: | Journal of applied physics, 15 Mar. 2006, v. 99, no. 6, 064103, p. 1-4 | Abstract: | Time-resolved photoluminescence (PL) near 540 nm, taken from barium titanate (BaTiO₃) ultrafine powders of ~80, 90, and 110 nm in size, was measured at 11 K. Two-exponential functions were found to fit the decay curves well, and the decay lifetimes were composed of one short, about 10 ns, and one long, about 200 ns, time constants, respectively. Results also indicate that the PL peaks show a small blueshift with decreasing BaTiO₃particle size. The decay process consists of the recombination of self-trapped excitons (long lifetime decay) and of the electrons in the surface states with the holes in the valence band (short lifetime decay). The short lifetime component makes comparable contribution to the decay intensity of PL with the long lifetime one. | Keywords: | Barium compounds Powders Photoluminescence Spectral line shift Particle size Surface states Valence bands Excitons |
Publisher: | American Institute of Physics | Journal: | Journal of applied physics | ISSN: | 0021-8979 | EISSN: | 1089-7550 | DOI: | 10.1063/1.2182075 | Rights: | © 2006 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in S. G. Lu et al., J. Appl. Phys. 99, 064103 (2006) and may be found at http://link.aip.org/link/?jap/99/064103. |
| Appears in Collections: | Journal/Magazine Article |
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| Lu_Time-resolved_photoluminescence.pdf | 182.33 kB | Adobe PDF | View/Open |
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