Studies on the optical stability of CsPbBr₃ with different dimensions (0D, 1D, 2D, 3D) under thermal environments

Abstract

The thermal stability of phosphor materials had long been a bottleneck in their commercialization. Nowadays, cesium lead halide perovskite CsPbBr3 was considered as a potential replacement for the next generation...

Sol–Gel Synthesis of Thermally Stable and Waterproof Silica-Coated CsPbBr3 Nanocrystals for White Light-Emitting Diodes

“…Especially, thermally induced permanent traps lead to slight crystal structure distortions, and thus trigger the irreversible fluorescence quenching. 34 Besides, the PL emission peak exhibits a slight blue shift during heating and is restored to the initial position during subsequent cooling down. This blue shift of PL emission peak is attributed to a stabilization of out-of-phase band-edge states as the lattice expands.…”

“…The difference between the final PL intensity and the initial one is defined as irreversible fluorescence quenching, which is related to the traps produced by thermal activation. Especially, thermally induced permanent traps lead to slight crystal structure distortions, and thus trigger the irreversible fluorescence quenching . Besides, the PL emission peak exhibits a slight blue shift during heating and is restored to the initial position during subsequent cooling down.…”

Advanced lead-free double perovskites/silica hybrid nanocrystals for highly stable light-emitting diodes

“…5c). 40 Subsequently, the time-resolved PL spectra of pure Cs 2 AgIn 0.98 Bi 0.02 Cl 6 NCs showed that the lifetime was shorter than that of Cs 2 AgIn 0.98 Bi 0.02 Cl 6 @KIT-6 NCs (Fig. 5d), which suggested that their non-radiative recombination ratio was higher (Table S4, ESI†).…”

Restricting Anion Migrations by Atomic Layer-Deposited Alumina on Perovskite Nanocrystals while Preserving Structural and Optical Properties

“…23 However, the deposition of single-layer graphene over a large device area is challenging, 24−27 and the curing temperature (130 °C) of graphene can cause degradation of CsPbBr 3 NCs. 16,28 An ideal approach to prevent anion exchange should have the following qualities: (i) prevention of anion migration for a longer duration, (ii) efficient charge transport, (iii) chemically stable, and (iv) an optically transparent layer. Present methods of preventing anion migration in LHPs lack several of these qualities.…”

“…Instead of a solution-based technique, Hautzinger et al developed a single-layer graphene (SLG) ion-blocking layer on top of the CsPbBr 3 NC film, which showed negligible anion diffusion for more than a month with minor broadening and shifts in PL peaks while allowing charge transfer . However, the deposition of single-layer graphene over a large device area is challenging, − and the curing temperature (130 °C) of graphene can cause degradation of CsPbBr 3 NCs. , …”