Size and Temperature Dependencies of the Low-Energy Electronic Structure of PbS Quantum Dots

作者：Litvin Aleksandr P; Parfenov Peter S; Ushakova Elena V; Gamboa Ana L Simoes; Fedorov Anatoly V; Baranov Alexander V^*

来源：Journal of Physical Chemistry C, 2014, 118(35): 20721-20726.

DOI：10.1021/jp507181k

The analysis of the steady-state and transient photo-luminescence (PL) of PbS quantum dots (QDs) of diameter in the 3.2-6.9 nm range in porous matrixes at temperatures 77-300 K shows that QDs of different sizes possess entirely different temperature dependencies of their PL properties. The data indicates the presence of two emissive "in-gap" states in the low-energy electronic structure of the QDs with characteristic dependencies on QD size and temperature. The lowest energy state is associated with surface defect states while the higher energy state is "intrinsic" and arises due to size-dependent splitting of the lowest excitons.

• 出版日期2014-9-4