Work

Sr derived synthesis of CsPbX3 nanocrystals for extraordinary stable luminescence

Year: 2026

Type: article

Abstract: • Highly stable and bright CsPbCl 3 NCs were studied by combining Sr doping at Pb sites via surface passivation. • Sr 2+ reduced lattice defects and enlarged the bandgap to induce a blue-shifted photoluminescence (PL) peak. • Sr:CsPbCl 3 NCs exhibit a PL peak of 405 nm with a remarkable PL quantum yield of 90.7%. • These NCs reveal high stability in ambient conditions, UV light irradiation, and in polar solvents. Low photoluminescence quantum yields (PLQYs) and poor stability limited the application of violet-emitting CsPbCl 3 nanocrystals (NCs). In this paper,highly stable and bright CsPbCl 3 NCs were studied by combining Sr doping at Pb sites with surface passivation using n-octylphosphonic acid (OPA). A novel hot-injection route was developed by employing acetate precursors and chlorotrimethylsilane. Comprehensive characterization revealed that Sr 2+ possessed similar ionic radius with Pb 2+ to effectively reduce lattice defects and enlarge the band gap, thereby inducing a blue-shifted PL peak. Simultaneously, the OPA ligand, leveraging the strong coordination ability of its phosphonic group, binds firmly to surface metal ions, effectively passivating surface defects and forming a hydrophobic barrier. Sr:CsPbCl 3 NCs created using optimized conditions exhibit a PL peak of 405 nm with a remarkable PLQY of 90.7%. The effect of Sr doping on the fluorescence decay kinetics of Sr:CsPbX 3 NCs was discussed. Furthermore, these NCs demonstrate outstanding stability under ambient atmospheric conditions, continuous UV light irradiation, and in polar solvents. This synergistic strategy, integrating internal lattice reinforcement and external surface shielding, was successfully extended to Sr:CsPbBr 3 and Sr:CsPbI 3 NCs, demonstrating its general applicability. Finally, high-quality red, green, and violet-emitting films were fabricated, highlighting the great potential for display applications.

Source: Applied Surface Science

DOI: 10.1016/j.apsusc.2026.166325

Authors: Wenbin Shi, Ping Yang, Xiao Zhang

Institutions: University of Jinan, Tohoku University, Institute for Materials Research, Tohoku University

Language: English

Topic: Perovskite Materials and Applications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,930

Funder: Jinan Science and Technology Bureau