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Direct evidence of photo-ionization causing luminescence "off" state in CdTe Quantum dots | | A. V. R. Murthy
; Padmashri Patil
; Shouvik Datta
; Shivprasad Patil
; | | Date: |
16 Aug 2012 | | Abstract: | We present a direct experimental evidence of photo-ionized CdTe quantum dot
core having luminescence "off" state at band-edge photo-excitation. We use the
autocorrelation of fluorescence fluctuations from dilute colloidal solution of
CdTe quantum dots in a diffraction limited detection volume to determine their
photo-ionization probability. The ionization probability is in the same order
of magnitude (approx10-6) as the CdSe and CdSe/ZnS core/shell quantum dots.
Further, we measured the ionization/ neutralization rates (approx104 s-1)
after addition of {eta}-mercaptanol and found that ionization rate is
enhanced by two orders of magnitude after the addition. However, a comparable
neutralization rate enhances the light emission quantum yield. The ionization/
neutralization at microsecond time scales puts an upper limit on achieving
better quantum yield by thiol addition. The results also indicate that the
dominant ionization mechanism at band-edge excitation is tunneling. | | Source: | arXiv, 1208.3286 | | Services: | Forum | Review | PDF | Favorites | |
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