Exploring the bounds of narrow-band quantum dot downconverted LEDs

Precursor reaction kinetics control compositional grading and size of CdSe1−xSx nanocrystal heterostructures

“…Such an approach could reduce the number of steps required to prepare CdSe/CdS heterostructures, nanocrystals that are highly desirable luminescent downconverters for solid-state lighting, electronic displays, and biological imaging applications. [16][17][18][19][20] In particular, grading the interface between CdSe and CdS is thought to reduce the rate of Auger recombination, 21 a multi-exciton recombination process that is sensitive to the microstructure of quantum dots Scheme 1 and of great importance to quantum dot lasers and down converting materials for solid state lighting. [22][23][24][25][26][27][28][29][30] However, recent theoretical and experimental studies on the link between graded alloys and Auger kinetics do not agree on the magnitude of this effect.…”

Size-Dependent Lattice Dynamics of Atomically Precise Cadmium Selenide Quantum Dots

“…The fact that we have atomically precise structural models for these nanoparticles allows the calculation of the PDOS using Density Functional Theory (DFT), providing both experimental and theoretical confirmations of the important role that the inertia of the surface capping species plays on determining the lattice dynamics.Colloidal semiconducting nanocrystals, commonly called quantum dot nanoparticles, have been studied exhaustively over the last thirty years due to their unique optoelectronic properties: size-tunable band-gaps, narrow, highly efficient photoluminescence, and long-term stability. For these reasons, they have started appearing in various products on the market ranging from television displays [1,2] to solid-state lightbulbs [3] and biological labels [4,5]. However, despite their commercial success, further development has been hindered by the lack of a detailed understanding of fundamental nanoparticle structure-property relationships, an important example of which is the nature of their lattice dynamics and how it is modified from bulk behavior by nanoparticle size [6].…”

Optimization of a spectrally tunable daylight simulator using four quantum dot light‐emitting diodes for visual appraisal of color

“…For the real ultraviolet and blue chips, as well as current QDs, the Res of both ultraviolet and blue chips were assumed to be 60%, and the Qes of QDs layers were assumed to be 50% to 90% . The LEs of LDSs for D50, D55, D65, and D75 are shown in Table .…”