Ultrastable and high colour rendering index WLEDs based on CsPbBrI₂ nanocrystals prepared by a two-step facile encapsulation method

Abstract

The graphical abstract clearly and succinctly shows the synthesis method and application prospect of this study.

An effective Fe(ii) doping strategy for stable and highly photoluminescent CsPbBrI2 nanocrystals

“…Among CsPbX 3 systems, the stability issues of red-emitting perovskites are particularly prominent and the most unstable a-CsPbI 3 could undergo the phase transition and become optically inactive. [24][25][26] Moreover, according to the hardsoft acid-base principle, surface ligand binding in iodide systems is unstable due to the soft nature of I À , which makes the surface more sensitive and vulnerable to damage, especially in the cases of the presence of antisolvents. 19 Instead, the suitable Goldschmidt tolerance factor and the octahedral parameter of CsPbBr 3 make it the most stable perovskite among CsPbX 3 .…”

“…Compared with CsPbI 3 , apart from better phase stability, mixed halide perovskite CsPbBrI 2 could also maintain a red emission with comparable intensity and has been extensively studied. [24][25][26] Nonetheless, CsPbBrI 2 has still encountered the issue of light-induced or moisture-induced phase separation, due to the weaker bond strength of Pb-I. 24 Metal ion doping is considered to be an effective strategy to modulate the intrinsic properties of semiconductors by introducing a different metal ion into the target lattice intentionally, keeping the host crystal structure unchanged.…”

“…Compared with CsPbI 3 , apart from better phase stability, mixed halide perovskite CsPbBrI 2 could also maintain a red emission with comparable intensity and has been extensively studied. 24–26 Nonetheless, CsPbBrI 2 has still encountered the issue of light-induced or moisture-induced phase separation, due to the weaker bond strength of Pb–I. 24…”

Encapsulation of perovskite quantum dots into a LnIII-incorporating polymer matrix to achieve white light emission

“…However, the rapid anion exchange between PQDs with different compositions has been a challenge for the realization of high-performance white light emission (WLE). [21][22][23] Three main strategies, namely ion doping, [24][25][26] surface passivation 27,28 and encapsulation engineering, [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48] have been developed to improve the stabilities of PQDs. Among them, encapsulation engineering can effectively prevent water and oxygen in the environment from entering PQDs, which is the most effective strategy in practice.…”

“…Three main strategies, namely ion doping, 24–26 surface passivation 27,28 and encapsulation engineering, 29–48 have been developed to improve the stabilities of PQDs. Among them, encapsulation engineering can effectively prevent water and oxygen in the environment from entering PQDs, which is the most effective strategy in practice.…”