Abstract
Surface InP quantum dots grown by gas source molecular beam epitaxy on In0.48Ga0.52P buffer layer lattice matched to GaAs substrate shows a broad-band near-infrared photoluminescence ranging from 750 to 865 nm dependent on their dimensions. A reversible luminescence intensity enhancement has been observed when the quantum dots were exposed to vapours of different chemical solvents with the highest sensitivity for alcohol (methanol and ethanol) vapours. The luminescent behaviour is dependent on the solvent type and concentration. The peak energy and band shape of the luminescence are not affected by the solvent vapour.
Highlights
Semiconductor quantum dots (QDs) show better suited photoluminescence (PL) properties as sensitive media in luminescence based devices, compared to commonly used dyes [1,2,3,4,5]
Surface InP quantum dots grown by gas source molecular beam epitaxy on In0.48Ga0.52P buffer layer lattice matched to GaAs substrate shows a broad-band near-infrared photoluminescence ranging from 750 to 865 nm dependent on their dimensions
QDs composed of InP on 250 nm thick In0.48Ga0.52P layer were grown using gas-source molecular beam epitaxy (GSMBE) in a RIBER 21T system on (100) GaAs substrates
Summary
Semiconductor quantum dots (QDs) show better suited photoluminescence (PL) properties as sensitive media in luminescence based devices, compared to commonly used dyes [1,2,3,4,5]. In the last ten years, authors reported the sensitivity of colloidal QDs embedded into polymeric matrix [7,8,9,10,11], sol-gel materials [12,13] or dispersed in Al2O3 nanopore array [13] Per se they display sensitivity towards some commonly used solvents like methanol, ethanol, acetone and chloroform [12]. In order to reach high level of emission intensity in such systems, it is common practice to passivate these surface states with a cap layer of a different semiconductor having a wider band gap relative to the QD material. In this way, the sensitivity of such systems to external environment is strongly reduced. In particular we report on the effect on the PL intensity of solvents having different polarity namely methanol, ethanol, acetone and chloroform
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