Abstract
Spectral characteristics of InP/ZnS core/shell colloidal quantum dots of two different sizes (QD-1 and QD-2) were investigated. Absorption and luminescence spectra were analyzed for a series of solutions with a concentration range from 0.04 to 40 g/l. Energies of the optical transitions are evaluated. The obtained values of 2.60 eV (QD-1) and 2.38 eV (QD-2) correspond to the InP first excitonic transitions while 4.06 (QD-2) and 4.70 eV (QD-1, QD-2) are assumed to be caused by the ZnS shell absorption. Structures based on nanoporous anodic aluminum oxide (AAO) with the QDs were synthesized via an electrochemical oxidation and ultrasonic-assisted deposition. Chromaticity coordinates and correlated color temperatures for all phosphors under study were calculated. The fabrication possibilities of InP/ZnS@AAO nanostructures with tunable emission color (including the border of white region) were shown.
Highlights
Colloidal quantum dots (QDs) attract much attention and research efforts over the past decades [1,2,3]
They are presented in figure 1 for colloidal QD-1 and QD-2 solutions of various concentrations
The QD-1 OA exhibits a distinct peak in the region of 450-480 nm after several dilutions
Summary
Colloidal quantum dots (QDs) attract much attention and research efforts over the past decades [1,2,3]. Their overgrowth with wider band gap ZnS shell is used to improve rather poor optical properties of as-prepared InP nanocrystals [10]. This work deals with optical and luminescence study of the InP/ZnS colloidal QDs deposited into anodic aluminum oxide (ААО) matrices. 2. Experimental InP/ZnS colloidal QDs of two different sizes marked DS-72a (QD-1) and DS-72b (QD-2) were synthesized by FSUE "NIIPA" (Dubna, Russia).
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