Color tunable upconversion luminescent perovskite fluoride with long-/short-lived emissions toward multiple anti-counterfeiting

A color-tunable UC luminescent perovskite fluoride KCdF₃:Yb³⁺,Mn²⁺,Ln³⁺with both long and short emission lifetimes has been demonstrated, showing high potential for multiple anti-counterfeiting with high throughput authentication rate.