Publications by authors named "Martha Judith Rivera-Medina"
Article Synopsis
- Researchers created blue LEDs that emit light at a specific peak wavelength of 481 nm and achieved a color purity of 88%, along with a luminance of 8260 cd/m² and an external quantum yield of 5.2%.
- The LEDs are made from a material called quasi-2D PEA(CsMA)PbBr, with an additive (isopropylammonium or iPAm) that helps prevent unwanted bulk-like phase formations.
- The study also shows that by managing energy transfer within the material, the researchers improved the efficiency of these blue-emitting LEDs, achieving a photoluminescence quantum yield over 60% and suggesting a potential for better optoelectronic devices using tailored
A comprehensive model for the optical transmission is constructed and used to investigate the requirements for fitting accurately the experimental data of the optical transmittance at normal incidence of transparent conducting coatings of ZnO:Al deposited on glass substrates by ultrasonic spray pyrolysis. The model takes into account the Urbach tail absorption edge at the low wavelength region, the contribution of free carrier concentration to the weak absorption in the visible and near-infrared ranges, and the effect of scattering of light originated by the surface roughness of the films. The carrier concentration of the ZnO:Al films was measured experimentally by the Hall effect and dc-electrical conductivity measurements in the Van der Paw configuration.
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