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Lead-free halide double perovskite Cs2AgInCl6 has become the research hotspot in the optoelectronic fields. It is a challenge to utilize the lattice doping by different lanthanide ions with rich and unique photoluminescence (PL) emissions for emerging photonic applications. Here, we successfully incorporated Dy3+, Sm3+, and Tb3+ ions into Cs2AgInCl6 nanocrystals (NCs) by the hot-injection method, bringing diverse PL emissions of yellowish, orange, and green light in Cs2AgInCl6:Ln3+ (Ln3+ = Dy3+, Sm3+, Tb3+). Moreover, benefiting from the energy transfer process, Sm3+ and Tb3+ ion-codoped Cs2AgInCl6 NCs achieved tunable emission from green to yellow orange and a fluorescent pattern from the as-prepared NC-hexane inks by spray coating was made to show its potential application in fluorescent signs and anticounterfeiting technology. This work indicates that lanthanide ions could endow Cs2AgInCl6 NCs the unique and tunable PL properties and stimulate the development of lead-free halide perovskite materials for new optoelectronic applications.

The use of multiple-center intramolecular H-bonds for the efficient construction of macrocycles of varying structures and functions is among the newest and the most noteworthy additions to the toolbox for macrocycle synthesis. This strategy has allowed the creation of sizable interior cavities as small as 2.8 Å and as large as 15 Å in radius in these H-bonded macrocycles with a number of them expressing tailor-made functions. While concentrating on our recent contributions to this fast-growing field, we will further summarize the latest advances on the design, synthesis, structure and function of these shape-persistent H-bonded macrocyclic foldamers that have helped to create a whole new dimension of scientific research, markedly expanding both the structural and functional repertoires of shape-persistent macrocycles.

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