TY - JOUR AU - P S Samokhvalov AU - P A Linkov AU - M A Zvaigzne AU - A V Kosmynceva AU - I O Petrova AU - V A Krivenkov AU - A V Sukhanova AU - I R Nabiev PY - 2018/04/17 Y2 - 2024/03/29 TI - Optical Properties of Core-Multishell Quantum Dots JF - KnE Energy JA - KEn VL - 3 IS - 2 SE - Articles DO - 10.18502/ken.v3i2.1850 UR - https://knepublishing.com/index.php/KnE-Energy/article/view/1850 AB - During the past decade, colloidal semiconductor nanocrystals or quantum dots (QDs) have become not only a subject of interesting fundamental research, but also a product for real-life applications. Intense activities devoted to enhancement of QDs photoluminescence (PL) quantum yield (QY), starting from early attempts to deposit protective ZnS shells atop CdSe cores, have resulted in novel designs of core-shell QDs with 100% PL QY. In this work we present a detailed analysis of optical properties of core-“multishell” (MS) QDs, whose physical structure is specifically designed to attain maximum localization of excited charge carriers inside luminescent cores, and thereby to achieve 100% PL QY. We have produced samples of core-MS QDs having 3 to 7 shell monolayers, studied the evolution of optical transitions in such QDs during the process of shell deposition, and analyzed the effects of shell thickness on the optical properties of finally obtained QDs. Specifically, studies of PL lifetimes have revealed the possibility of alternative emission mechanism, based on delayed charge carrier transfer from excited outer CdS layer of the multishell into CdSe cores.Keywords: quantum dots, core-shell, multishell, SILAR ER -