Comparative Analysis of Methods for Enhancement of the Photostability of CdTe@TGA QD Colloid Solutions

Abstract

The employment of colloid quantum dots in a number of applications is limited by their instability under light irradiation. Additional methods of photostability enhancement of UV+visible-irradiated TGA-stabilized CdTe quantum dots are investigated. Photostability enhancement was observed via either addition of sodium sulphite in the role of chemical oxygen absorber or addition of 1% of gelatin, or, finally, by additional stabilization by bovine serum albumine (BSA). The latter method is the most promising since it not only enhances the quantum dots' photostability but also makes them more biocompatible and extends the possibilities of their biological applications.2

Фотостабильность люминесценции квантовых точек Ag-=SUB=-2-=/SUB=-S и структур ядро/оболочка Ag-=SUB=-2-=/SUB=-S/SiO-=SUB=-2-=/SUB=-

“…Одной из фундаментальных проблем, возникающих на пути прикладного использования КТ в приложениях, построенных на люминесценции, является ее деградация под действием фотовозбуждающих квантов . Отмечено существенное влияние нестехиометрии соединения, из которого синтезированы КТ [11][12][13][14][15][16][17][18]. Фотодеградация ИК люминесценции неоднократно наблюдалась в коллоидных КТ Ag 2 S, состав которых обладает высокой степенью нестехиометрии [21][22][23][24][25][26][27][28].…”

Photostability of luminescence of Ag-=SUB=-2-=/SUB=-S quantum dots and Ag-=SUB=-2-=/SUB=-S/SiO-=SUB=-2-=/SUB=- core/shell structures

“…One of the fundamental problems that arise in the way of the applied use of QDs in applications based on luminescence is its degradation under the action of photoexciting quanta . A significant influence of the non-stoichiometry of the compound from which QDs [11][12][13][14][15][16][17][18] were synthesized was noted. Photodegradation of IR luminescence has been repeatedly observed in colloidal Ag 2 S QDs, the composition of which has a high degree of non-stoichiometry [21][22][23][24][25][26][27][28].…”