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  • The effect of temperature and dot size on the spectral properties of colloidal InP/ZnS core-shell quantum dots.

The effect of temperature and dot size on the spectral properties of colloidal InP/ZnS core-shell quantum dots.

ACS nano (2009-08-18)
Arun Narayanaswamy, L F Feiner, A Meijerink, P J van der Zaag
ABSTRACT

Visual color changes between 300 and 510 K were observed in the photoluminescence (PL) of colloidal InP/ZnS core-shell nanocrystals. A subsequent study of PL spectra in the range 2-510 K and fitting the temperature dependent line shift and line width to theoretical models show that the dominant (dephasing) interaction is due to scattering by acoustic phonons of about 23 meV. Low temperature photoluminescence excitation measurements show that the excitonic band gap depends approximately inversely linearly on the quantum dot size d, which is distinctly weaker than the dependence predicted by current theories.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
InP/ZnS quantum dots, stabilized with oleylamine ligands, fluorescence λem 620 nm, 5 mg/mL in toluene
Sigma-Aldrich
InP/ZnS quantum dots, stabilized with oleylamine ligands, fluorescence λem 590 nm, 5 mg/mL in toluene
Sigma-Aldrich
InP/ZnS quantum dots, stabilized with oleylamine ligands, fluorescence λem 530 nm, 5 mg/mL in toluene
Sigma-Aldrich
InP/ZnS quantum dots, stabilized with oleylamine ligands, fluorescence λem 560 nm, 5 mg/mL in toluene
Sigma-Aldrich
InP/ZnS quantum dots, stabilized with oleylamine ligands, fluorescence λem 650 nm, 5 mg/mL in toluene