Achieving Color‐Tunable Long Persistent Luminescence in Cs₂CdCl₄ Ruddlesden‐Popper Phase Perovskites

Abstract

Two‐dimensional (2D)‐halide perovskites have been enriched over recent years to offer remarkable features from diverse chemical structures and environmental stability endowed with exciting functionalities in photoelectric detectors and phosphorescence systems. However, the low conversion efficiency of singlet to triplet in 2D hybrid halide perovskites reduces phosphorescence lifetimes. In this study, the long persistent luminescence of 2D all‐inorganic perovskites with a self‐assembled 2D interlayer galleries structure is investigated. The results show that the decay time of the long persistent luminescence increases from 450 s to 600 s, and the luminescence color changes from cyan to orange, and the thermal stability of photoluminescence enhances dramatically after replacing Cd2+ by appropriate Mn2+ ions in 2D Cs2CdCl4 Ruddlesden‐Popper phase perovskites. Furthermore, diversified anti‐counterfeiting modes are fabricated to highlight the promising applications of Cs2CdCl4 perovskite systems with tunable persistent luminescence in advanced anti‐counterfeiting. Therefore, our studies provide a novel model for realizing tunable long persistent luminescence of perovskite with 2D self‐assembled layered structure for advanced anti‐counterfeiting.

The unique luminescent properties and enhanced thermal stability of a novel all-inorganic perovskite CsCaCl3:Mn2+ for solid-state lighting applications

“…Inorganic luminescent crystals have garnered significant attention in recent years due to their remarkable optoelectronic properties and potential applications in lighting and display technologies. 1–5 In particular, inorganic perovskite luminescent materials have sparked widespread interest due to their unique properties such as high photoluminescence efficiency, tunable bandgap, and excellent charge transport characteristics. 3–5 However, there is a crucial need to explore new materials that are non-toxic and abundant, considering the environmental and health concerns associated with the commonly used toxic lead (Pb) and cadmium (Cd) containing materials.…”

“…1–5 In particular, inorganic perovskite luminescent materials have sparked widespread interest due to their unique properties such as high photoluminescence efficiency, tunable bandgap, and excellent charge transport characteristics. 3–5 However, there is a crucial need to explore new materials that are non-toxic and abundant, considering the environmental and health concerns associated with the commonly used toxic lead (Pb) and cadmium (Cd) containing materials. 6–20 This has motivated researchers to investigate alternative materials that offer both efficient luminescence and reduced toxicity.…”

A Robust Anti-Thermal-Quenching Phosphor Based on Zero-Dimensional Metal Halide Rb3InCl6:xSb3+

“…perovskite nanocrystals with a temperature-independent emission from 298 to 373 K. 10 The fluorine-rich shell was purported to have a wider energy gap than the inner nanocrystal core, suppressing carrier trapping and improving thermal stability. 8,10 Han et al found that Mn 2+ -doped Rb 3 Cd 2 Cl 7 single crystals did not suffer from luminescence intensity quenching up to 423 K. 20,24,25 More recently, Zhou et al developed a Zr 4+ /Mn 2+ codoped CsCdCl 3 system featuring a robust anti-TQ radioluminescence up to 448 K, a record value for metal halide materials. 12 The authors hypothesized that the thermally stable radioluminescence was due to compensation of the emission losses at high temperatures by thermally activated energy transfer from defects to the Mn 2+ emitters.…”

“…12 However, even though anti-TQ metal halide perovskite phosphors have been intensely explored in the last three years, their anti-TQ behavior still lags behind that of the metal nitride/oxide-based phosphors. [10][11][12]20 More importantly, they are either Pbbased 10,11 or Cd-based hosts, 12,20,25,26 which are toxic.…”

Spectral Tunability, Luminescence Enhancement, and Temperature Sensitivity of Sb3+-Doped Bismuth-Based Halide Emission Crystals for Anti-Counterfeiting Applications

“…Recently, the exploration of all-inorganic halide perovskite crystals has gained significant attention due to their potential for applications, including lighting, displays, and sensing. − However, the presence of toxic elements, such as Pb and Cd, in some known all-inorganic perovskite emitters has raised environmental and health concerns. − Therefore, there is an imperative need to develop nontoxic alternatives with desirable luminescent properties.…”