The temperature dependence of the absorption and fluorescence spectra of colloidal CdSe nanocrystals was compared for three different shapes (dots, rods, and tetrapods) in the range of 4–300K. While the shift of the fluorescence maximum indicates little dependence on the shape, the authors find that the broadening of the emission spectrum behaves very differently for dots and rods, indicating major differences in the broadening mechanisms for different shapes. Tetrapods behave more similarly to dots, which suggests that the lowest exciton state is centered at the core.

Development of high energy density hybrid electrode based on rGO–PMo₁₂ for all-solid state supercapacitors along with actual demonstration of lighting of thirty one LEDs (NEO).

Synchrotron radiation enables probing a wide range of length scales operando, hence being a powerful tool in battery research. Challenges ahead involve cell design (especially for multi-modal approaches) and protocols for automated data analysis.

Femtosecond photoluminescence (PL) up-conversion studies in polychromatic mode and laser-power-dependence studies of the PL were carried out on colloidal solutions of CdSe quantum dots with diameters ranging from $2.4\text{to}4\mathrm{nm}$. The main features of the spectra consist, in addition to the band-gap luminescence, of three bands, one $120–130\mathrm{meV}$ and another $30–40\mathrm{meV}$ at low energy to the band-gap luminescence, while the third lies $220–260\mathrm{meV}$ higher in energy. The first band is attributed to a positively charged biexciton and the second to a neutral biexciton, while the blue band is attributed to a neutral triexciton. These assignments are based on the energetics, the lifetimes, and the pump-power dependence of the various bands. The energetics and lifetimes are in good agreement with the theoretical studies present in literature.