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.
Similar content being viewed by others
References
A. P. Alivisatos, Science 271, 933 (1996).
M. Kuno, J. K. Lee, B. O. Dabbousi, F. V. Mikulec, and M. G. Bawendi, Journal of Chemical Physics 106, 9869 (1997).
O. I. Micic, J. Sprague, Z. H. Lu, and A. J. Nozik, Applied Physics Letters 68, 3150 (1996).
O. I. Micic and A. J. Nozik, Journal of Luminescence 70, 95 (1996).
A. A. Guzelian, J. E. B. Katari, A. V. Kadavanich, U. Banin, K. Hamad, E. Juban, A. P. Alivisatos, R. H. Wolters, C. C. Arnold, and J. R. Heath, Journal of Physical Chemistry 100, 7212 (1996).
A. P. Alivisatos and M. A. Olshavsky, Patent No. 5,505,928 (9 April 1996).
A. P. Alivisatos, X. G. Peng, and M. Liberato, Patent No. 6,306,736 (23 October 2001).
U. Banin and Y. -W. Cao, USA Patent No. 20030010987 (16 January 2003).
O. I. Micic, C. J. Curtis, K. M. Jones, J. R. Sprague, and A. J. Nozik, Journal of Physical Chemistry 98, 4966 (1994).
R. J. Ellingson, J. L. Blackburn, P. R. Yu, G. Rumbles, O. I. Micic, and A. J. Nozik, Journal of Physical Chemistry B 106, 7758 (2002).
M. Furis, Y. Sahoo, D. J. MacRae, F. S. Manciu, A. N. Cartwright, and P. N. Prasad, Journal of Physical Chemistry B 107, 11622 (2003).
D. Battaglia and X. G. Peng, Nano Letters 2, 1027 (2002).
O. I. Micic, H. M. Cheong, H. Fu, A. Zunger, J. R. Sprague, A. Mascarenhas, and A. J. Nozik, Journal of Physical Chemistry B 101, 4904 (1997).
H. X. Fu and A. Zunger, Physical Review B 56, 1496 (1997).
M. Nirmal, D. J. Norris, M. Kuno, M. G. Bawendi, A. L. Efros, and M. Rosen, Physical Review Letters 75, 3728 (1995).
Acknowledgements
This work was supported in part by ANC’s NSF CAREER Grant #9733720, ONR YIP Grant #N00014-00-1-0508, and a Defense University Research Initiative on Nanotechnology Grant #F496200110358 through the Air Force Office of Scientific Research.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Furis, M., MacRae, D.J., Lucey, D.W. et al. Spectroscopy Studies of InP Nanocrystals Synthesized Through a Fast Reaction. MRS Online Proceedings Library 789, 276–281 (2003). https://doi.org/10.1557/PROC-789-N3.35
Published:
Issue Date:
DOI: https://doi.org/10.1557/PROC-789-N3.35