Photonics and Nanomaterials
Controllable emission wavelength of QDs allows making laser at any colors. Quantum Dot is a promising materials for low threshold and temperature insentive laser.
A white Light Emitting Diode (LED) is made from nanocomposite materials which is incorporation of color-tunable colloidal quantum dot into nanoporous Gallium Nitride scaffold adjacent to active area (quantum well) of blue LED.
Silica encapsulated colloidal quantum dots were synthesized by water-in-oil microemulsion growth technique. The Electrostatic Force Self-Assembly Method (EFSA) was developed to pattern the single colloidal quantum dot silica spheres in an array. Each element in the array was demonstrated as single photon emitter.
This research goal is to investigate the (In)GaN/organic semiconductor hybrid heterojunction device as a part of ongoing efforts to improve the performance of (In)GaN-based optoelectronic devices and to explore novel materials.
The research demonstrates near-field photon-mediated coupling of vastly dissimilar optical excitations in the two materials that can reach efficiencies of up to 98% at room temperature. The optical attributes of our quantum dot/J-aggregate hybrids are highlighted by their robust excitonic transition at room temperature with spectrally concentrated absorption and emission strengths.
A compact system incorporating a 32-element linear array of ultraviolet (UV) light-emitting diodes (LEDs) to the in-flight fluorescence detection of aerosolized particles. Custom electronics manage a standalone system and enable real-time processing of spectral data, which is used to cue a miniaturized aerodynamic deflector for physical particle separation.
Developed nitride based blue-green and ultraviolet microscale LED devices with particular classes of imaging and spectroscopic applications in cellular level biology. We illustrated the utility of the blue-green micro-LEDs for voltage sensitive dye imaging of individual neural cells, as well as their ultraviolet counterparts for photo stimulation of neurons.