Abstract
Transparent afterglow crystals are keenly desired for three-dimensional
information storage. Herein, CsCdCl3 perovskite crystals
were grown by a programmable cooling procedure in a hydrothermal
reactor. The pristine crystal showed an abnormal optical behavior where
the absorption increased by 2.3 folds at high temperature, leading to a
4-fold boost of PL intensity. After Mn2+ doping, the
PL QY was improved to nearly unity. Importantly, the doped crystals
exhibited an ultralong afterglow up to 12 hours after ceasing UV
excitation and a high transmittance up to 75% in the visible region.
This work brought a new member to the library of transparent afterglow
crystal, opening up many possibilities to advanced applications such as
volumetric display and three-dimensional information encryption.
KEYWORDS: CsCdCl3 crystal ∙ ultra-long
afterglow ∙ thermally enhanced luminescence ∙ resonant energy transfer ∙
transparent afterglow matrix