Skip to main content Accessibility help
×
Home

Spectroscopy Studies of InP Nanocrystals Synthesized Through a Fast Reaction

  • Madalina Furis (a1), David J. MacRae (a2), D. W. Lucey (a2), Yudhisthira Sahoo (a2), Alexander N. Cartwright (a1) and Paras N. Prasad (a1)...

Abstract

We present spectroscopic characterization of InP nanocrystals grown through a fast reaction in a non-coordinating solvent. The photoluminescence (PL) spectra collected from these nanocrystals exhibit a sharp feature associated with the band-edge emission and a broad infrared feature associated with deep level surface trap emission. The emission efficiencies of the as-grown nanocrystals vary between 0.3% and 1% from sample to sample. After undergoing an HF etching process, the emission efficiency increases to 18% and the emission associated with surface states is eliminated from the PL spectrum. Time-resolved photoluminescence (TRPL) experiments conducted at room temperature on the as-grown and HF-etched nanocrystals show that before etching the PL intensity decay is multi-exponential, with a fast (3ns) component independent of wavelength, associated with the non-radiative recombination processes. The etching process effectively eliminates the non-radiative component and the post-etching PL decay can be fitted with a single exponential decay characterized by long (45ns) lifetimes. We tentatively associate these long lifetimes with the recombination of carriers from spin-forbidden states. This assignment is supported by the observation of a significant redshift of the feature associated with band-edge recombination in the PL spectrum with respect to the lowest energy feature in the photoluminescence excitation (PLE) spectrum.

Copyright

References

Hide All
1. Alivisatos, A. P., Science 271, 933 (1996).
2. Kuno, M., Lee, J. K., Dabbousi, B. O., Mikulec, F. V., and Bawendi, M. G., Journal of Chemical Physics 106, 9869 (1997).
3. Micic, O. I., Sprague, J., Lu, Z. H., and Nozik, A. J., Applied Physics Letters 68, 3150 (1996).
4. Micic, O. I. and Nozik, A. J., Journal of Luminescence 70, 95 (1996).
5. Guzelian, A. A., Katari, J. E. B., Kadavanich, A. V., Banin, U., Hamad, K., Juban, E., Alivisatos, A. P., Wolters, R. H., Arnold, C. C., and Heath, J. R., Journal of Physical Chemistry 100, 7212 (1996).
6. Alivisatos, A. P. and Olshavsky, M. A., Patent No. 5,505,928 (9 April 1996).
7. Alivisatos, A. P., Peng, X. G., and Liberato, M., Patent No. 6,306,736 (23 October 2001).
8. Banin, U. and Cao, Y. -W., USA Patent No. 20030010987 (16 January 2003).
9. Micic, O. I., Curtis, C. J., Jones, K. M., Sprague, J. R., and Nozik, A. J., Journal of Physical Chemistry 98, 4966 (1994).
10. Ellingson, R. J., Blackburn, J. L., Yu, P. R., Rumbles, G., Micic, O. I., and Nozik, A. J., Journal of Physical Chemistry B 106, 7758 (2002).
11. Furis, M., Sahoo, Y., MacRae, D. J., Manciu, F. S., Cartwright, A. N., and Prasad, P. N., Journal of Physical Chemistry B 107, 11622 (2003).
12. Battaglia, D. and Peng, X. G., Nano Letters 2, 1027 (2002).
13. Micic, O. I., Cheong, H. M., Fu, H., Zunger, A., Sprague, J. R., Mascarenhas, A., and Nozik, A. J., Journal of Physical Chemistry B 101, 4904 (1997).
14. Fu, H. X. and Zunger, A., Physical Review B 56, 1496 (1997).
15. Nirmal, M., Norris, D. J., Kuno, M., Bawendi, M. G., Efros, A. L., and Rosen, M., Physical Review Letters 75, 3728 (1995).

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed