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Also, with decrease of the quantum dot size, the self-focusing effect increases.
The reduced LGOs showed a blue-shifted dual-wavelength PL and strong decrease of the quantum yields.
A decrease of the quantum efficiency upon deuteration has often been reported in the literature and this has been rationalized on the basis of the lower tunnelling probability of the deuteron in the double well potential of hydrogen bonds.
From the figure, it is clear that the resonance peak position shifts towards lower energies with increasing quantum size L. The main reason for this behavior is the decrease of the quantum confinement with increasing L. Also, the energy difference between two electronic states reduces by increasing L. Therefore, the resonance peak position shifts towards lower energies.
The decrease of the quantum yield could be a result from fast non-radiative relaxation of the excited states, induced by the interaction of the ligands to Si QDs or surface states, which also could be an interpretation for the lifetime shortening.
In this way the transition towards a classical transport picture is faster than the transition caused by just a linear decrease of the quantum component.
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Note that the wurtzite structure is polarized along the c-axis caused by spontaneous and piezoelectric polarizations, resulting in the quantum-confined Stark effect and decrease of the internal quantum efficiency of light-emitting devices.
According to our quantum screening effect model, as anode to the top of cathode separation d (like the top of our P-SiNT) approaches to nano-distance, the local field will decrease because of the quantum screening effect, but the applied field did not decrease because the separation of anode to the bottom of cathode is still large.
We note a blue shift of the strong visible photoluminescence (PL) bands after AVE treatment due to the decrease of the silicon quantum dots diameter (Si-QDs).
Evidently, the substitution of meso-phenyl rings by nitrogen atoms results in a decrease of the luminescence quantum yields.
Since the blue shift of the spectra under the decrease of helium residual pressure is accompanied by a certain decrease of the nanocrystal size, the quantum confinement mechanism [1] can be considered as one of main opportunities.
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