TY - JOUR
T1 - Greatly enhanced luminescence efficiency of CdS nanoparticles in aqueous solution
AU - Kuznetsova, Yulia V.
AU - Letofsky-Papst, Ilse
AU - Sochor, Benedikt
AU - Schummer, Bernhard
AU - Sergeev, Alexander A.
AU - Hofer, Ferdinand
AU - Rempel, Andrey A.
PY - 2019/11/20
Y1 - 2019/11/20
N2 - A simple shell-creating technique for the synthesis of CdS nanoparticles covered by ZnS is presented, which also contributes to the understanding of their low quantum yield and luminescence intensity in water, which is usually below 0.01%. The CdS nanoparticles with about 0.8 nm thick ZnS shell were synthesized in a colloidal aqueous solution and stabilized by EDTA. The CdS carrier lifetime and the quantum efficiency is greatly increased. For the latter, values up to 2.7% were achieved. A mechanism for the CdS nanoparticle luminescence in the aqueous solution is proposed, which is based on radiative recombination of charge carriers with structural defects. It was found that the synthesis of CdS in air leads to the inclusion of oxygen atoms in the structure of nanoparticles, which strongly effects the luminescence spectrum. These results show that most of the CdS luminescence centers are localized inside the nanoparticle.
AB - A simple shell-creating technique for the synthesis of CdS nanoparticles covered by ZnS is presented, which also contributes to the understanding of their low quantum yield and luminescence intensity in water, which is usually below 0.01%. The CdS nanoparticles with about 0.8 nm thick ZnS shell were synthesized in a colloidal aqueous solution and stabilized by EDTA. The CdS carrier lifetime and the quantum efficiency is greatly increased. For the latter, values up to 2.7% were achieved. A mechanism for the CdS nanoparticle luminescence in the aqueous solution is proposed, which is based on radiative recombination of charge carriers with structural defects. It was found that the synthesis of CdS in air leads to the inclusion of oxygen atoms in the structure of nanoparticles, which strongly effects the luminescence spectrum. These results show that most of the CdS luminescence centers are localized inside the nanoparticle.
KW - CdS
KW - Core/shell
KW - Hybrid nanoparticles
KW - Luminescence
KW - Quantum dots
KW - ZnS
UR - http://www.scopus.com/inward/record.url?scp=85070688361&partnerID=8YFLogxK
U2 - 10.1016/j.colsurfa.2019.123814
DO - 10.1016/j.colsurfa.2019.123814
M3 - Article
AN - SCOPUS:85070688361
SN - 0927-7757
VL - 581
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
M1 - 123814
ER -