Blue light-emitting diodes based on colloidal quantum dots with reduced surface-bulk coupling.

ABSTRACT: To industrialize printed full-color displays based on quantum-dot light-emitting diodes, one must explore the degradation mechanism and improve the operational stability of blue electroluminescence. Here, we report that although state-of-the-art blue quantum dots, with monotonically-graded core/shell/shell structures, feature near-unity photoluminescence quantum efficiency and efficient charge injection, the significant surface-bulk coupling at the quantum-dot level, revealed by the abnormal dipolar excited state, magnifies the impact of surface localized charges and limits operational lifetimes. Inspired by this, we propose blue quantum dots with a large core and an intermediate shell featuring nonmonotonically-graded energy levels. This strategy significantly reduces surface-bulk couplin

SUBMITTER: Chen X 

PROVIDER: S-EPMC9845229 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature