The Photothermal Stability Study of Quantum Dots Embedded in Sodium Chlorides

Abstract

An efficient and useful method for the incorporation of colloidal quantum dots (QDs) into ionic matrices is demonstrated. We prepared three different synthesis methods, which are traditional saturated-salt water, methanol-assisted, and ethanol-assisted methods. The continuous thermal and photonic stress tests indicate that the high temperature, instead of photonic excitation stress, is more detrimental to the illumination capability of the quantum dots. While the traditional saturated-salt water synthesis and methanol-assisted method are quite effective in low temperature and low photon excitation intensity, the quantum dots sealed by the ethanol-assisted method cannot hold under all conditions. An over-1000-h aging test can provide crucial information for the longevity of these quantum dots, and more than 10,000 h of lifetime can be expected.

Macromatrices for nanoscale particles

“…Based on the developed methods to embed QDs into ionic macromatrices, detailed studies have been carried out to investigate the effects of the ionic matrices on the properties of the incorporated QDs. In order to understand the difference among methods, Huang and his co-workers investigated the photostability of CdTe QDs embedded in the same NaCl matrix using three different methods, 65 comparing slow evaporation in water to methanol assisted LLDC and ethanol assisted LLDC methods. From this, it has been found that the CdTe QDs loaded via the slow evaporation and methanol assisted LLDC methods revealed higher photostability than that of the CdTe QDs sealed using the ethanol assisted LLDC method (Fig.…”