Highly Luminescent Cd_1−xZn_xSe/ZnS Core/Shell Nanocrystals Emitting in the Blue–Green Spectral Range

Abstract

Getting the green light: ZnS‐coated Cd1−xZnxSe alloy nanocrystals are stable and efficient emitters, whose color can easily be tuned in the blue–green spectral range by changing the ratio of the metal precursors applied during synthesis. Incorporated into a polymer matrix, they can be used for the conversion of blue (see image, top) or UV (bottom) light to green light at 530 nm.

Synthesis of highly fluorescent glutathione-capped ZnxHg1−xSe quantum dot and its application for sensing copper ion

“…Without changing the particle size, a new strategy for tuning the optical properties of the QDs has been accomplished through the control of the constituent stoichiometries in alloyed QDs [18,[20][21][22][23]. A two-step procedure involving the nucleation process and crystal growth is commonly used for the preparation of alloyed QDs in aqueous and organic phases [20][21][22][23]. For example, GSH-capped Zn x Cd 1Àx Se QDs with tunable fluorescence emissions (428-474 nm) and high QYs have been synthesized by incorporating Cd 2+ into very small ZnSe seeds [18].…”

Indium Phosphide‐Based Quantum Dots with Shell‐Enhanced Absorption for Luminescent Down‐Conversion

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LEDs) used in display or lighting applications. In the case of ZnSe core QDs, bandgap tuning by addition of Cd has been achieved before via hot injection methods [26][27][28] or cation exchange reactions. [23,24] As QDs typically have higher absorption coefficients the more the photon energy exceeds the bandgap energy, [25] we expect that adding even small amounts of Cd can boost the absorbance at 450 nm and suppress self-absorption in remote phosphor films.

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Single-source precursor route for overcoating CdS and ZnS shells around CdSe core nanocrystals

“…Single-source precursors, such as metal thiocarbamate and xanthate salts, can also be thermolysed to yield nanoparticles [25,26]. Mono-molecule precursors have also been used in the shell growth process [27][28][29]. Herein, we adopt the monomolecule precursor route for the construction of the most developed and also one of the best optical performance systems CdSe/CdS/ZnS.…”