Long Persistent Luminescence from All‐Inorganic Perovskite Nanocrystals

Abstract

The advantages of ultrahigh https://photoluminescence quantum yield and narrow spectral bandwidth of all‐inorganic lead halide perovskite https://nanocrystals (NCs) enable them as the most potential candidates for optoelectronic applications. However, it is difficult to obtain long persistent luminescence from inorganic perovskite https://nanocrystals as the creation of effective trapping centers comes along with the generation of nonradioactive recombination centers. Here, replacing Pb2+ by appropriate lanthanide ions (Ln3+) in CsPbBr3 https://nanocrystals that are embedded inside an amorphous transparent medium via a high‐temperature (≈500 °C) fabrication process is proposed to achieve stable and effective trapping centers. Furthermore, the surface coating of the enclosed https://nanocrystals prevents the formation of surface defects, leading to long persistent luminescence from CsPbBr3: Ln3+ NCs. The CsPbBr3: Ln3+ NCs with unprecedented high color purity (≈89.9%) and long lasting time of more than 1800 s could be a promising candidate for the application in anti‐counterfeiting.

Combinations of Superior Inorganic Phosphors for Level‐Tunable Information Hiding and Encoding

“…As revealed in Figure 12d, a QD code with green emission is obtained at 240 K after removing excitation source for 30 min. Variable information is also distinguished easily as the temperature increases from 77 to 270 K. [ 271 ] In addition to the temperature, optical emission is switched by the pH value. An acid treatment way is proposed to gain different displays of designed patterns.…”

Room-Temperature Persistent Luminescence in Metal Halide Perovskite Nanocrystals for Solar-Driven CO 2 Bioreduction

“…23,24 Also, defects can trap free charges and lead to the generation of long-lived charges with lifetimes up to hours. 23,25,26 The long-lived charges can recombine to produce persistent luminescence [26][27][28] or be transported to the surface of the semiconductors for photocatalysis. 23 The large number of unavoidable defects in MHPs also leads to modification of their bandgaps and the entrapment of free charges; that is, the defects empower MHPs with undiscovered optoelectronic properties.…”

Core–Shell Structured Upconversion/Lead‐Free Perovskite Nanoparticles for Anticounterfeiting Applications

“…Zhang et al. embedded CsPbBr 3 : Ln 3+ NCs with long‐lived persistent luminescence in a transparent amorphous medium and suggested that the different luminescence phenomena of these NCs at different temperatures can be used for anticounterfeiting [23] . Lead‐free perovskite materials have attracted much attention in areas like solar cells and X‐ray detection.…”