Luminescence properties of In(Zn)P alloy core/ZnS shell quantum dots

Abstract

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Tuning the Lattice Parameter of InxZnyP for Highly Luminescent Lattice-Matched Core/Shell Quantum Dots

“…21 At the same time, the PL QY of the alloyed QDs increased from about 0-1% in pure InP up to 20% for Zn/In = 1.5 (figure 4c) and the PL decay became longer (see figure S12 and table S2), suggesting that the Zn 2+ ions, in addition to being incorporated in the QD lattice, could passivate the surface of the QDs. 21,57 The possibility of tuning both optical properties and lattice parameters of the In x Zn y P QDs by varying only one synthetic parameter, i.e. the amount of Zn precursor, is promising for achieving high PL QY QDs upon the epitaxial growth of a lattice-matching shell material.…”

“…An alternative explanation is that the alloyed In x Zn y P material has a different (bulk) bandgap than pure InP. 21 Indeed, it is well known that in many bulk semiconductor alloys there is a direct correlation between the alloy composition and its band gap. 32,[52][53][54] In addition, the degree of quantum confinement could also be different, if the effective masses of electrons and holes change in the alloy.…”

“…InP-based QDs are among the most investigated nontoxic Cd-free systems, owing to their comparable emission range. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] However, in terms of PL QY and PL stability they cannot yet compete with Cd-based QDs.…”

“…Although the addition of Zn to the synthesis of InP nanocrystals has become common practice in the last years, [11][12][13][14][15][16][17][21][22][23][24][25] very little has been reported on the actual role of the Zn. The few reports on this topic have focused on the effect on the optical properties, but structural aspects were not investigated.…”

Solvothermal preparation and fluorescent properties of color-tunable InP/ZnS quantum dots

“…5a, d) is the formation of In(Zn)P alloy QDs. Reiss et al reported the preparation of In(Zn)P alloy QDs by including Zn stearate during InP core QD synthesis and blue-shifted absorption and emission of the alloyed QDs compared to pure InP QDs [23], suggesting that doping (or alloying) of Zn ion into InP lattice is likely to occur despite the presence of valence mismatch. Since our InP/ZnS QD synthesis is based on one-pot approach without an intermediate purification after the synthesis of InP core QDs, unreacted In and P sources remaining in the core crude solution can possibly participate in the partial alloying process with Zn source during the following ZnS shelling, leading to an increase in band gap.…”