Shape-Dependent Stark Shift and Emission-Line Broadening of Quantum Dots and Rings

development of different optical methods for determination of glucose using cadmium telluride quantum dots and silver nanoparticles

a simple, rapid and low-cost scanner spectroscopy method for the glucose determination by utilizing glucose oxidase and cdte/tga quantum dots as chromoionophore has been described. the detection was based on the combination of the glucose enzymatic reaction and the quenching effect of h2o2 on the cdte quantum dots (qds) photoluminescence.in this study glucose was determined by utilizing glucose...

Excitonic structure and pumping power dependent emission blue-shift of type-II quantum dots

In this work we study theoretically and experimentally the multi-particle structure of the so-called type-II quantum dots with spatially separated electrons and holes. Our calculations based on customarily developed full configuration interaction ap- proach reveal that exciton complexes containing holes interacting with two or more electrons exhibit fairly large antibinding energies. This effec...

Line broadening caused by Coulomb carrier-carrier correlations and dynamics of carrier capture and emission in quantum dots

Suppression of inhomogeneous broadening using the ac Stark shift

Inhomogeneous broadening is ubiquitous in light-matter interactions [1]. When a laser beam interacts with a gas, the dominant broadening is typically due to the Doppler effect, which causes atoms to experience different laser frequencies depending on their velocities. For atoms embedded in crystals, the inhomogeneous broadening is a result of the shifts in the energy levels due to local variati...

Manipulating quantum-confined Stark shift in electroluminescence from quantum dots with side gates

Single quantum dot (QD) light-emitting diodes were fabricated with side gates in a lateral p-i-n structure. The electroluminescence (EL) energy from the QDs can be controlled independently by the side gates and by forward bias. Stark shifts in EL have been observed up to 0.4meV as a function of forward injection current, and around 0.7meV by applying an electric field of 36 kV cm across the QDs...