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Synthesis of Blue Emitting InP/ZnS Quantum Dots Through Control of Competition Between Etching and Growth

Synthesis of Blue Emitting InP/ZnS Quantum Dots Through Control of Competition Between Etching and Growth

Kipil Lim, Ho Seong Jang, Kyoungja Woo

Nanotechnology. 2012 Dec 7;23(48):485609.

PMID: 23138715

Abstract:

Blue (<480 nm) emitting Cd-free quantum dots (QDs) are in great demand for various applications. However, their synthesis has been challenging. Here we present blue emitting InP/ZnS core/shell QDs with a band edge emission of 475 nm and a full width at half maximum of 39 nm (215 meV) from their quantum confined states. The drastic temperature drop immediately after mixing of the precursors and holding them at a temperature below 150 °C was the critical factor for the synthesis of blue emitting QDs, because the blue QDs are formed by the etching of ultra-small InP cores by residual acetic acid below 150 °C. Etching was dominant at temperatures below 150 °C, whereas growth was dominant at temperatures above 150 °C. ZnS shells were formed successfully at 150 °C, yielding blue emitting InP/ZnS QDs. The colour of the InP/ZnS QDs depicted on the CIE 1931 chromaticity diagram is located close to the edge, indicating a pure blue colour compared to other InP-based QDs.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS76918	InP/ZnS quantum dots			Price

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