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Semiconductor quantum dots (QDs) are a class of low-dimensional nanomaterials, some of which can be obtained by colloidal synthesis methods. Unique phenomena occur when electrons are confined to a few nanometers of space, such as highly monochromatic emission and size-dependent wavelength shifts. Owing to the high ratio of surface atoms to the total number of atoms in QDs, not only the crystalline structure of the core, but also surface control is key to achieving high quality emission from QDs. Techniques such as the "hot injection" method, which can produce monodisperse nanoparticles with high crystallinity, and the "core/shell" structure, in which the core is coated with another wide bandgap semiconductor material to confine photoexcited excitons, have improved the emission properties of QDs to the point where they can be used in commercial displays. Efforts are underway to expand applications further by removing cadmium and incorporating QDs into electroluminescent devices. The emergence of various optical devices using these approaches is anticipated. [ABSTRACT FROM AUTHOR]

SiO2/CeF3 composite films for electroluminescent devices was fabricated on heavily doped n- type silicon substrates using vacuum electron beam evaporation vapor deposition. The microstructure and composition of each film layer in the device were characterized, and the electroluminescence (EL) characteristics of the devices were also studied. The experimental results show that the device can emit light in both forward and reverse connection. But, there are obvious differences in the EL spectra when the device is in forward and reverse connection, and the corresponding current-voltage characteristics curve of the device is asymmetrical. When the device is in forward connection, the EL peaks are located at 504 nm (green light region) and 680 nm (red light region). When the device is in reverse connection, in addition to a weak EL peak at 684 nm (red light region), there is also a strong blue EL peak located at 434 nm. [ABSTRACT FROM AUTHOR]

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