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(a) Schematic illustration of CQDs. (b) Four s-shell exciton levels as functions of the electric field for CQDs of with .
PL spectra as functions of electric field for CQDs of and with (a), 10.4 (b), and 10.8 (c) nm, and for ones of and with (d), 10.4 (e), and 10.8 (f) nm, respectively. The darker the gray, the larger the optical transition intensity.
(a), and (b) as functions of under the condition and (c), and (d) as functions of under the condition for the CQDs of (solid lines), 8 (dashed lines), and 11 (dotted lines) nm, respectively. (e) and (f) as functions of the corresponding for the CQDs of (circles), 8 (upward triangles), and 11 (downward triangles) nm with different or used above and compared with those (dashed lines) obtained by using Eqs. (3) and (4).
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