Investigation of the Emission Spectral Properties of Carbon Dots in Packaged LEDs Using TiO2 Nanoparticles
We examined light-emitting diodes (LEDs) packaged with silicone encapsulation of carbon dots (CDs) that is doped using TiO2 nanoparticles (TiO2NPs). The results reveal that the adjustable emission spectra in a wide wavelength range (peak wavelength varies from ∼430 to ∼600 nm) can be obtained by controlling the amount of TiO2NPs for CDs embedded in the silicone encapsulant, and that the various colors of LEDs can be produced using CDs at a concentration of 10 wt%. Moreover, the luminous intensity can be increased by 31% at a TiO2NPs concentration of 0.05 wt%. These optical characteristics of CDs-based LEDs emerge from the enhanced light scattering ability of TiO2NPs, which increases the light reabsorption and extraction probability. Therefore, the proposed method has great potential for achieving low-cost and high-performance CDs-based LEDs for particular applications.