Organic molecules that exhibit long persistent
luminescence (LPL) are rapidly gaining attention for a variety of applications.
In this study, organic molecules with simple structures were selected and
organic long persistent luminescence (OLPL) crystals were prepared. The crystal
structure of the prepared OLPL crystal was elucidated and the guideline for the
design of OLPL crystal was clarified. LPL was observed in OLPL crystals
prepared with TMB as the guest molecule and 1,2-bis(diphenylphosphino)ethane as
the host molecule. XRD measurements of the OLPL crystals suggest that the guest
molecule is a solid solution substituted in the stable crystal structure of the host
molecule in a lattice-shrinking direction.
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