Long afterglow luminescent materials have captured intense attention for their unique applications in biological imaging, photodynamic therapy, and optical anti-counterfeiting. However, achieving highly efficient and tunable ultralong afterglow emission in all-inorganic metal halides is an open challenge. Herein, Sb 3+ -doped hexagonal CsCdCl 3 metal halide is reported via hydrothermal reaction. Upon photoabsorption, the as-synthesized compounds exhibit dual-emission bands with a photoluminescence quantum yield (PLQY) of 59.6%, which can be attributed to the self-trapped exciton emission out of the strong electron-phonon coupling. After ceasing excitation of 365 nm, bright afterglow emission with the longest duration lasting up to 5000 s is witnessed in Sb 3+ -doped CsCdCl 3 . More importantly, the color-tunable and time-dependent ultralong afterglow emission is realized via regulating the doping concentration of Sb 3+ , which should be due to the trap electrons increase gradually under high doping concentration. Given this unusual afterglow emission characteristics, the optical anti-counterfeiting and information encryption are constructed based on as-synthesized compounds. These findings not only help further understand the tunable afterglow emission mechanism in all-inorganic metal halides, but also provide a new strategy for designing novel ultralong afterglow luminescent materials.

Though the power conversion efficiency (PCE) of organic solar cell (OSC) has been pushed over 19% under 1 sun illumination, its stability is still the short board impeding the commercialization,...

Block copolymer‐based organic solar cells (OSCs) possess better stability than their binary all‐polymer counterparts; thus, promoting the power conversion efficiency (PCE) of them to a higher level would be meaningful to achieving a higher level of efficiency–stability balance. Herein, two‐step annealing combining solvent vapor and thermal annealing (TA) upon cast films is deployed and 15% efficiency for block copolymer PM6‐b‐PY‐IT‐based OSCs is realized, which appeals to the level of traditional binary all‐polymer solar cells. The morphology optimization of the properly enhanced crystallite size, global crystallinity, and reduced pure phase length scale and maintained phase purity are supposed to be the driving force of increase device performance. This work offers a high PCE for the typical type of solar cell, brightening the prospect of realizing OSCs’ application.

Organic Solar Cells In article number http://doi.wiley.com/10.1002/solr.202200617, Tao Yang, Teng Zhang, Bingsuo Zou, Tao Liu, and co‐workers applied a two‐step annealing method in which solvent vapor annealing and thermal annealing are included, and successfully achieved 15% efficiency for block copolymer‐based or single‐component organic solar cells. This two‐step annealing also pushes the non‐halogenated solvent dissolved binary all‐polymer solar cells towards > 17% efficiency.

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