一种青色长余辉发光材料Ba3Ca2（PO4）3Cl∶Eu2+, Ho3+的设计、制备与光学信息存储

Abstract： Cyan long-persistent luminescent materials are relatively rare.In this work， Ba 3 Ca 2 (PO 4 ) 3 Cl was cho• sen as the host， and a phosphor with excellent cyan afterglow performance was successfully prepared via high-temper• ature solid-state reaction.Its optical information storage behavior was also investigated.The detailed crystal struc• ture parameters of the host were determined through structural refinement， and its density of states was calculated.Under 349 nm excitation， both Eu 2+ -doped and Eu 2+ /Ho 3+ co-doped samples exhibited bright cyan emission， with the emission spectra showing two distinct peaks at 455 nm and 493 nm， corresponding to the characteristic 4f 6 5d 1 -4f 7 transitions of Eu 2+ at different lattice sites.Compared with the single doped samples， the introduction of Ho 3+ created new trap levels in the system， significantly enhancing the cyan afterglow performance.Finally， the afterglow mecha• nism and optical information storage behavior of the material were further analyzed， providing important reference for the study and application of cyan long-persistent phosphors.Keywords： long-persistent phosphor； Eu 2+ -doped； Ho 3+ -doped； thermoluminescence； optical information storage 1 引 言 长