We report the development of new nanophosphor structures based on the Mn-doped ZnSeS material system to enhance the color properties, luminosity and efficiency of white LEDs. These structures have been demonstrated for phosphor-based white LED applications utilizing both blue and UV LED systems. Bandgap tuning for near UV (405 nm) and blue (460 nm) excitations are reported. Using various optimization procedures, we have produced ZnSe:Mn nanoparticles with an external quantum yield greater than 80%.

. The present paper is devoted to the design of a new shielded metal-dielectric waveguide with low losses (less than 0.5 dB/m) and wide bandwidth for the 90–100 GHz frequency range. Various types of waveguide structures were analyzed, such as metal waveguides, oversized metal waveguides, dielectric waveguides, dielectric waveguides with a metal shield and various designs of the dielectric filling element. Estimates of loss per unit length in them are obtained. The design of a waveguide containing an oversized round metal screen and a dielectric element consisting of a plate and a rod, located in the center of symmetry of the device, is proposed. The task of creating a transition from the investigated waveguide to a standard rectangular metal waveguide is considered. It is a horn transition from a circular cross-section to a rectangular one with a length of more than 25 wavelengths with a dielectric structure continuing the dielectric element of the waveguide path. As a result of the work, the ratios of the dimensions of the structural elements of the waveguide path and the materials used were obtained that satisfy the required losses.

We report on a novel low-cost approach for producing large format flexible RGB phosphor sheets with applications in both lighting and displays. The process can utilize any conventional down-conversion/up-conversion phosphor or non-phosphor optical powder materials regardless of particle size, shape, and composition. Both monochrome and patterned phosphor sheets can be produced in widths larger than 50 inch and lengths over 50 meters by roll-to-roll. Substrate thickness can vary from 50 microns (2 mils) to over 500 microns (20 mils) with monolayer control over phosphor coating thickness and better than 5% color uniformity. This technology is currently being used to produce high performance remote phosphor sheets for phosphorconverted white LEDs with ultra-high color rendering index (CRI>96) and correlated color temperature (CCT) from 2700K to over 8000K. A customized red/green phosphor film has also been shown to deliver 100% of NTSC color gamut for LCD display applications when combined with a blue LED.