Crafting Core/Graded Shell-Shell Quantum Dots with Suppressed Re-absorption and Tunable Stokes Shift as High Optical Gain Materials. Academic Article uri icon


  • The key to utilizing quantum dots (QDs) as lasing media is to effectively reduce non-radiative processes, such as Auger recombination and surface trapping. A robust strategy to craft a set of CdSe/Cd(1-x)Zn(x)Se(1-y)S(y)/ZnS core/graded shell-shell QDs with suppressed re-absorption, reduced Auger recombination rate, and tunable Stokes shift is presented. In sharp contrast to conventional CdSe/ZnS QDs, which have a large energy level mismatch between CdSe and ZnS and thus show strong re-absorption and a constrained Stokes shift, the as-synthesized CdSe/Cd(1-x)Zn(x)Se(1-y)S(y)/ZnS QDs exhibited the suppressed re-absorption of CdSe core and tunable Stokes shift as a direct consequence of the delocalization of the electron wavefunction over the entire QD. Such Stokes shift-engineered QDs with suppressed re-absorption may represent an important class of building blocks for use in lasers, light emitting diodes, solar concentrators, and parity-time symmetry materials and devices.

published proceedings

  • Angew Chem Int Ed Engl

altmetric score

  • 1.35

author list (cited authors)

  • Jung, J., Lin, C. H., Yoon, Y. J., Malak, S. T., Zhai, Y., Thomas, E. L., ... Lin, Z.

citation count

  • 40

complete list of authors

  • Jung, Jaehan||Lin, Chun Hao||Yoon, Young Jun||Malak, Sidney T||Zhai, Yaxin||Thomas, Edwin L||Vardeny, Valy||Tsukruk, Vladimir V||Lin, Zhiqun

publication date

  • April 2016