Now showing items 1-10 of 355
Low-cost, large-scale, ordered ZnO nanopillar arrays for light extraction efficiency enhancement in quantum dot light-emitting diodes
We report a QLED with enhanced light outcoupling efficiency by applying a layer of periodic ZnO nanopillar arrays. The resulting QLED reaches the record external quantum efficiency (EQE) of 9.34% in green-emitting QLEDs ...
Novel optical antenna designs of comb shaped split ring architecture for NIR and MIR enhanced field localization
We demonstrated NIR/MIR resonance behavior in optical antennas of comb-shaped split-ring resonators enabling substantially larger field enhancements than single/array of dipoles with the same side length, despite their ...
Nanocrystal emitters for enhanced photovoltaics in UV
[No abstract available]
Enhanced exciton transfer from the cascaded bilayer of green-and red-emitting CdTe quantum dots into bulk silicon
(Optical Society of America, 2013)
We show enhanced transfer of excitons from the energy-gradient of bilayered green/red-emitting quantum dots into silicon using cascaded nonradiative energy with an overall enhancement factor of 1.3 at room temperature for ...
Excitonic energy transfer dynamics in hybrid organic/inorganic nanocomposites at high loading levels
(Optical Society of America, 2012)
Temperature dependent exciton migration in the hybrid nanocomposites of conjugated polymers chemically integrated with quantum dots is studied at high loading levels. The underlying interplay between the exciton transfer ...
Tunable white light generating nanocyrstal-hybridized LEDs
We hybridize CdSe/ZnS core-shell nanocrystals on InGaN/GaN near-UV/blue LEDs to generate light widely tunable across the visible spectral range and within the white region of the chromaticity diagram with adjustable ...
Electric field dependence of radiative recombination lifetimes in polar InGaN/GaN quantum heterostructures
We report on external electric field dependence of recombination lifetimes in polar InGaN/GaN quantum heterostructures. In our study, we apply external electric fields one order of magnitude less than and in opposite ...
Unraveling exciton kinetics of electroluminescence in colloidal quantum dot LEDs
(Optical Society of America, 2016)
We systematically studied emission kinetics of colloidal quantum dots in active light-emitting diodes using time-correlated single photon counting and conclusively revealed the combined effect of both electric field and ...
Large-area semi-transparent light-sensitive nanocrystal skins
Large area and semi-transparent highly light sensitive nanocrystal skin is demonstrated via spray-coating nanocrystals on top of polyelectrolyte-polymers based on photogenerated potential buildup where no external bias is ...
Blue InGaN/GaN-based quantum electroabsorption modulators
We introduce InGaN/GaN-based quantum electroabsorption modulator that incorporates ∼5 nm thick In0.35Ga0.65N/GaN quantum structures for operation in the blue spectral range of 420-430 nm. This device exhibits an optical ...