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Title
Inside Back Cover.
Abstract
The cover picture depicts a material that exhibits green ultralong organic afterglow at room temperature. This phosphorescent material is fabricated by utilizing luminophores with different configurations of triazatruxene derivatives through a host‐guest doping strategy. The host‐guest material demonstrates a remarkable potential for multi‐level dynamic data encryption and anti‐counterfeiting. Further details are discussed in the article authored by Liang et al. on page 2261—2268.