Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
The performance of LEDs, displays and other lighting applications could be substantially increased by using narrow band green and red luminescent materials. Conventional red emitting materials reduce the device efficiency because they emit in a broad spectral region. As a result, a significant fraction of the emitted light has a wavelength longer than 630 nm. The sensitivity of the human eye drops drastically for wavelength longer than 630nm, therefore making displays and LEDs inefficient. Hence, we are in need of narrow band emitters. This can be achieved by using semiconductor nanoparticles (NPs).
In particular CdSe nanoplatelets (2D NPs) are of great interest for future application due to their narrower spectral linewidth compared to 0D and 1D confined NPs. Unfortunately, core-shell NPLs do not exhibit the same narrow spectral linewidth [1][2]. To understand the difference in broadening between core and core-shell NPLs, the temperature dependent linewidth broadening of core and core-shell NPLs and QDs were measured and compared. The temperature dependence of the increase in linewidth was similar for all three systems, indicating that the broadening in core QDs and core-shell NPLs is increased relative to core-only NPLs due to inhomogeneous broadening. This shows that the increase in spectral linewidth of CdSe Core-shell NPLs is not due to an increase in homogenous broadening caused by differences in electron-phonon coupling as previously suggested[3]. Instead it is caused by the CdS or ZnS shell, probably related to inhomogeneities of the shell and exciton emission originating from different region in the core-shell NPLs where local electronic structure and bandgap are affected by variations in the shell thickness.
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