Multicolor luminescence of Cs₂KLuCl₆ for anti-counterfeiting and information encryption applications

Area of Science:

• Materials Science
• Solid-State Chemistry
• Optoelectronics

Background:

• Inorganic perovskites doped with Sb³⁺ are promising for anti-counterfeiting and information encryption due to their optical properties.
• Cs₂KLuCl₆ exhibits intrinsic cyan emission from self-trapped excitons (STEs).

Purpose of the Study:

• To synthesize and characterize a novel Sb³⁺-doped perovskite, Cs₂KLuCl₆.
• To investigate the enhancement of photoluminescence quantum yield (PLQY) via Sb³⁺ doping.
• To explore the modulation of luminescent properties for anti-counterfeiting and information encryption.

Main Methods:

• Synthesis of Cs₂KLuCl₆ perovskite.
• Doping with Sb³⁺, Ho³⁺, Yb³⁺, and Er³⁺ ions.
• Photoluminescence spectroscopy to analyze optical properties and energy transfer mechanisms.
• Fabrication of anti-counterfeit labels and information encryption strategies.

Main Results:

• Sb³⁺ doping significantly enhanced the PLQY of Cs₂KLuCl₆ from 2% to 68%.
• Energy transfer from STEs to Ho³⁺ allowed color modulation from cyan to white.
• Co-doping with Sb³⁺/Ho³⁺ resulted in dual-color luminescence.
• Up-conversion green emission was achieved with Yb³⁺/Er³⁺ co-doping.

Conclusions:

• Sb³⁺-doped Cs₂KLuCl₆ perovskites offer tunable luminescence for advanced applications.
• The developed materials are suitable for creating sophisticated anti-counterfeit labels.
• This work demonstrates a viable strategy for information encryption using tailored perovskite luminescence.