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Based on the PbS QD diameter of 4 - 5 nm estimated from HRTEM results, the quantum-confined energy bandgap can be calculated to be between 0.9 and 1.06 eV (the corresponding wavelengths at 1380 and 1170 nm) by the formula proposed by Moreels et al.1,2 The first exciton peak at 1320 nm (corresponding energy of 0.94 eV) was observed in the ... ................
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