First principles study of the optical emission of cadmium yellow: Role of cadmium vacancies
Source abstract
Abstract
We study the role of structural defects in the CdS-based cadmium yellow paint to explain the origin of its deep trap states optical emission. To this end, we combine a first principles study of Cd- and S- vacancies in the wurtzite (101¯0) CdS surface with experimental photoluminescence spectroscopy of the commercial hexagonal CdS pigment. Computational results clearly state that the presence of cadmium vacancies in the pigment surface alters the electronic structure of cadmium sulfide by forming acceptor levels in the gap of the semiconductor. Such levels are consistent with the optical emission from trap state levels detected in the CdS pigment. This finding provides a first step towards the understanding of the photo-physical mechanisms behind the degradation of this modern pigment, widely used in impressionist and modernist paintings.
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Research context
OpenAlex topics: Chalcogenide Semiconductor Thin Films · Pigment Synthesis and Properties · Copper-based nanomaterials and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
CNR-IOM Cagliari, c/o Dipartimento di Fisica, Università di Cagliari, Cittadella Universitaria 1 , 09042 Monserrato, Italy
Dipartimento di Scienze Chimiche e Geologiche, Università di Cagliari, Cittadella Universitaria 2 , 09042 Monserrato, Italy
CNR-IFN Milano 3 , Piazza Leonardo da Vinci, 20133 Milano, Italy
Dipartimento di Fisica, Politecnico di Milano 4 , Piazza Leonardo da Vinci, 20133 Milano, Italy
Department of Physics, University of North Texas 5 , Denton, Texas 76203, USA
Funding
CRS4 Centro di Ricerca, Sviluppo e Studi Superiori in Sardegna · Consiglio Nazionale delle Ricerche · Regione Autonoma della Sardegna · Fondazione Banco di Sardegna
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