Luminescence Spectra of Quantum-Sized CdS and PbI₂Particles in Static Electric Field

Abstract

The influence of external electric field was studied on the luminescence behavior of quantum-sized CdS and PbI2 nanocrystals, embedded in various polymeric films. The clear increase in the photoluminescence intensity from the quantum-sized particles was observed, as well as the spectral shift of photoluminescence bands. The mechanism proposed is based on the field-induced oxygen desorption from the nanocrystal surface which is the good photoluminescence inhibitor.

Electroabsorption by 0D, 1D, and 2D Nanocrystals: A Comparative Study of CdSe Colloidal Quantum Dots, Nanorods, and Nanoplatelets

“…Over the past three decades, a pronounced QCSE has been observed in semiconductor quantum dots (QDs) and QWs that were grown in glass matrices, fabricated through MBE, or synthesized using the methods of colloidal chemistry. − The QCSE in the QD-based electro-optic absorbers operating in the near-infrared telecommunication range is still of high interest. − Electro-optic elements based on the semiconductor nanoparticles synthesized with colloidal chemistry have advantages over those prepared using the MBE or MBE-related techniques. First, the synthesis of such QDs is cheap, easy, and gives multigram quantities of QDs with controllable dimensions.…”

ELECTROMODULATION OF PHOTOLUMINESCENCE FROM CdSe NANORODS FILM

“…In the general class of quantum dots, chemically synthesized semiconductor nanocrystals also exhibit electric field effects, for example, as demonstrated in their optical absorption (e.g. the quantum confined Stark effect [2,3]) and in their optical emission as the Stark shift and luminescence quenching [4,5]).…”

Zeta Potential-Based Control of CdSe/ZnS Quantum Dot Photoluminescence

“…The sensitivity of semiconductor quantum dot (QD) photoluminescence (PL) to the electric field arises mainly from the field-induced dissociation of free or bound excitons as well as the quantum-confined Stark effect (QCSE). − Commonly, the application of an external electric field results in strong PL quenching, which is normally a parasitic effect in the electroluminescence, but can be utilized, for example, in biology for membrane potential detection in cells. , Though the application of an external electric field is required to observe the field-induced PL quenching; a similar effect can also be provoked by the nearby localized charges. Such charges can be associated with specific QD surface ligands or ions in the solution.…”