The optical and luminescence properties of DyxPb1−xSe QDs developed using mercaptoproponic acid assisted colloidal route for optoelectronic applications

Abstract

The nanocrystalline semiconducting quantum dots have shown fantastic optoelectronic features. The establishment of nonradiative recombination of photogenerated charge carrier is the utmost difficulty to obtain laser from QDs. Therefore, it is essential to improve the optoelectronic gain or to optimize the optical loss. Here, DyxPb1−xSe nanocrystalline QDs were synthesized using mercaptoproponic acid assisted colloidal approach to amplify the photonic gains and enhancing the quantum yield. The structure of the prepared DyxPb1−xSe QDs using XRD revealed a cubic crystalline phase. The TEM images inspected the increase of their size from 3.3 nm to 9.4 nm upon the increase of Dy dopants. The bandgap decreased from 1.62 eV to 1.27 eV due to the formed sublevels by Dy atoms. The Pl spectrum demonstrated the photonic gain amplification where the PL intensity increased by 40 times with sharp spectral bandwidth. The quantum yield increased to 79%. The amplification of photonic gain and marvel quantum yield perhaps pave the way to use the DyxPb1−xSe QDs as a potential candidate for optoelectronic devices.