| 초록 |
Colloidal quantum dots (QDs) are promising emitters for display applications due to their high color purity and high luminescence efficiency. However, most of the QDs with excellent optical properties contain highly toxic elements such as cadmium (Cd), their application is limited considering environmental issue. Recently, environmentally friendly silver−indium−gallium−sulfide (AIGS) quaternary QDs with narrow emission linewidth have been reported. One of the drawbacks of AIGS QDs is low quantum yield of photoluminescence (PL QY, ~40%). In the present work, core-shell structured AIGS QDs were synthesized, and the results indicated that AIGS/AGS core-shell QDs, synthesized at high temperature, is an efficient way for the improvement of optical properties. The core/shell QDs with a tetragonal crystalline phase exhibit a full width at half-maximum less than 40 nm and a wavelength of 520 nm. Moreover, the PL QY of the present green-emission QDs was as high as 71.2%. |
