A facile route to synthesize CdSe/ZnS thick-shell quantum dots with precisely controlled green emission properties: towards QDs based LED applications

Junjie Hao (1, 2) , Haochen Liu (2) , Jun Miao (3) , Rui Lu (2) , Ziming Zhou (2) , Bingxni Zhao (2) , Bin Xie (2) , Jiaji Cheng (4) , Kai Wang (2) , Marie-Hélène Delville (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 Department of Electrical and Electronic Engineering
3 The Institute of Applied Physics and Materials Engineering
4 School of Materials Science and Engineering

In recent, the quantum yield (QY) and stability of green quantum dots (QDs) have been significantly improved. However, most of the progresses were achieved by using alloyed QDs, and the control of green emission QDs still remains challenging. Herein, we report a novel method for synthesizing thick-shell structure quantum dots (TSQDs) with saturated green-emitting where tri-n-octylphosphine (TOP) was used as both ligand and solvent to extract the redundant ions from the QDs surface and remove the lattice imperfections before any surface inorganic layer-by-layer coating. The as-prepared TSQDs demonstrate enhanced luminescent properties including high QY reaching up to 75%, full width at half maximum (FWHM) remaining close to 26 nm and tunable precise emission properties (532 nm), which can be utilized to perform 91% of the International Telecommunication Union (ITU) Recommendation BT. 2020 (Rec. 2020) for high definition and color gamut displays.

Domaines: Matériaux

Junjie Hao, Haochen Liu, Jun Miao, Rui Lu, Ziming Zhou, et al.. A facile route to synthesize CdSe/ZnS thick-shell quantum dots with precisely controlled green emission properties: towards QDs based LED applications. Scientific Reports, 2019, 9, pp.12048. ⟨10.1038/s41598-019-48469-7⟩. ⟨hal-02269039⟩