Synthesis of ZnSe Quantum Dots with Stoichiometric Ratio Difference and Study of its Optoelectronic Property

Exciton-Photon Interactions in Semiconductor Nanocrystals: Radiative Transitions, Non-Radiative Processes and Environment Effects

“…The coupling to propagating surface plasmons mathematically is described by the pole of r (p) , which yields an additional imaginary part of the integral from 1 to ∞ in Equations ( 17) and (18). Indeed, the equation (r (p) ) −1 = 0 determines the dispersion relation of p-polarized SPs.…”

“…During the last decade, a considerable research activity has been focused on the synthesis and investigation of the optical properties of ZnSe QDs. These nanocrystals exhibit large blue shift of the photoluminescence [18] and high enough (up to 50 percent) quantum yield [19]. Similarly to CdSe NCs, the ZnSe QDs can be synthesized with a sufficiently narrow size distribution, which is possible to control by temperature [20].…”

Exciton-photon interactions in semiconductor nanocrystals: {radiative transitions, non-radiative processes,} and environment effects

“…Here, γ 0 is the decay rate in an infinite medium with dielectric constant ε 1 , given by Equation (1). The integrals in Equations ( 17) and (18) with respect to the normalized in-plane wavevector, s = q/k 1 , can be divided into two parts, one from 0 to 1 corresponding to propagating waves in the upper half-space and the other from 1 to ∞ representing evanescent waves with imaginary wavevector component along z axis perpendicular to the interface, k 1z . The latter type of waves exist in two cases: (i) if ε 1 < ε 2 and both dielectric constants are positive and (ii) if ε 2 ≡ Re(ε 2 ) < 0, i.e., when the second medium is a metal.…”

“…The coupling to propagating surface plasmons mathematically is described by the pole of r (p) , which yields an additional imaginary part of the integral from 1 to ∞ in Equations ( 17) and (18). Indeed, the equation (r (p) ) −1 = 0 determines the dispersion relation of ppolarized SPs.…”