TERNARY AND QUATERNARY SEMICONDUCTOR QUANTUM DOTS FOR VISIBLE AND WHITE LIGHT LED.
Colloidal quantum dots (QDs) are semiconductor at nanometer scale. They exhibit the quantum confinement effect, which makes possible to tune the absorption or signal emitted across the entire spectrum by controlling the nanocrystal size and composition. We synthesize ternary and quaternary core/shell quantum dots to form colloidal ink to be painted on flexible and hard substrates to design visible, near infrared and white light LED. We have a special interest in the design of laser and single photon sources both on hard and flexible substrates.
PEROSVSKITE QUANTUM DOTS FOR VISIBLE AND WHITE LIGHT LED.
Hybrid perovskite semiconductor is a promising material for optoelectronic devices, the major problem is the poor stability. However, inorganic perovskites quantum dots (PQDs) exhibit high photoluminescence quantum yields, wide wavelength tunability, and ultra-narrow band emissions, the combination of these superior optical properties and low cost fabrication makes them to be suitable candidates for display and lighting technology. We synthesize inorganic perovskite quantum dots (PQDs), highly stable and strongly efficient. They are then used to design visible and white light LED on hard and flexible substrates. It is explored the use of other ions to substitute toxic lead ions, while tunability is controlled by combining different halides and nanoparticle sizes. In particular, we are interested to evaluate potential applications as a single photon sources
We explore the use of quantum dots and lanthanide doped nanoparticles with visible emission to be used as a nanophosphor that combined with the appropriate LED produces white light via photoluminescence process. Both quantum dots and nanoparticles are synthesized in our lab and characterized by spectroscopy and a wide range of appropriated techniques. Then, nanophosphors are used with commercial LEDs and also with devices prepared in our lab.