|dc.description.abstract||Today approximately one third of the world population (about two billion
people) in under-developed countries has no access to electricity and relies on
unhealthy, costly and low-quality fuel-based lighting for home illumination. In
the rest of the world, lighting consumes a large portion (20%) of the total
electricity production, which significantly contributes to global warming
problem. Also given limited resources, such large energy consumption needs to
be reduced for sustainable economic growth. Solid state lighting provides
remedy to these problems for the entire globe. Therefore, the advancement of
white light emitting diodes (WLEDs) becomes a key point for development of
human civilization. To this end, the strong demand for the development of high
quality WLEDs around the globe motivates our research work on the
investigation of white light generation with high color rendering index.
In this thesis, we develop and demonstrate nanocrystal hybridized light
emitting diodes with high color rendering index. By the hybridization of
multiple layer-by-layer assemblies of CdSe/ZnS core-shell nanocrystals on blue
and near ultraviolet (n-UV) InGaN/GaN light emitting diodes, we show white light generation with highly tunable optical properties such as tristimulus color
coordinates, correlated color temperature, and color rendering index.
Additionally, by using dual hybridization of nanocrystals in combination with
conjugated polymers, we obtain white light sources with high color rendering
indices exceeding the requirements of the future solid state lighting applications.
In this thesis, we present design, growth, fabrication, experimental
characterization and theoretical analysis of these hybrid white LEDs.||en_US