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

Abstract

The development of efficient, non-toxic, and cost-effective white-light emitters is crucial for advancing lighting technology. Here, we present a groundbreaking study on a new all-inorganic perovskite crystal, CsCaCl₃:Mn²⁺, which exhibits temperature sensing and hue-tunable white light emission. The CsCaCl₃ matrix emits broad blue light at 455 nm due to self-trapped exciton (STE) emission. Upon Mn²⁺ doping, the CsCaCl₃:Mn²⁺ crystal emits broad yellow light at 555 nm, originating from the Mn^{2+ 4}T₁(G)–⁶A₁(S) transition. Increasing Mn²⁺ concentration led to a decrease in blue emission intensity, accompanied by enhanced yellow emission, suggesting an energy transfer from STEs to Mn²⁺. The enhanced stability of CsCaCl₃:Mn²⁺ compared to pure CsCaCl₃ is demonstrated through thermal analysis. The distinctive temperature-dependent responses of STE and Mn²⁺ emissions in CsCaCl₃:Mn²⁺ suggest its potential application in temperature sensing. The synthesis process for this luminescent crystal is both straightforward and scalable, making it a promising candidate for large-scale applications.