Optical gain in CdSe nanocrystals

Photoluminescence Characteristics of CdSe/ZnS Quantum Dot Doped Fibers in Different Matrices

“…The key elements of QDFA are whether QD incorporated into different matrices has big gain and how to change these matrices to be optical fiber. Researches have shown that QD incorporated into a dielectric matrix or precipitated in a solution exhibit great gain and amplify effects: Kyhm [6] et al investigated the dynamics of the photo-excited excitons in CdSe colloidal QD dissolved in toluene, Optical gain was measured and broad gain spectrum was obtained. Reboud [7] et al reported experimental results of 240% PL enhancement in 2D photonic crystals nanoimprinted in functionalized PMMA based polymer in which CdSe/ZnS core-shell QD have been incorporated.…”

Photoluminescence spectra of thin films containing CdSe/ZnS quantum dots irradiated by 532-nm laser radiation and gamma-rays

“…The II-IV semiconductor nanostructures are potential candidates for advanced devices with much improved performance, e.g., bluegreen semiconductor diode lasers, light-emitting diodes (LEDs), bio-luminescence markers, etc. [1][2][3][4][5]. In the core/shell structure of the II-IV semiconductor nanocrystals (NCs), e.g., CdSe NCs (bandgap, E g ¼ 1.7 eV @ 300 K [6]), capped with a thin layer of a larger bandgap semiconductor, ZnS (E g ¼ 3.68 eV @ 300 K [6]), the holes are confined in the CdSe core due to passivation of the QDsurface by ZnS layer, but the electron wavefunction extends into the ZnS shell.…”