Abstract
Persistent phosphors have the ability to emit light long after the excitation has ended, typically by using thermal energy to liberate previously trapped charges. Alternatively, also photons can be used for the detrapping, leading to optically stimulated luminescence (OSL). This particular field of phosphor research has seen a strong expansion over the past two decades, with a steady growth of the materials library, an improved structural and luminescence characterization and the development of novel applications. Despite this success, clear challenges lie ahead in terms of a deeper understanding of the trapping mechanism and an associated optimization of the energy storage capacity being crucial for many applications. This focus issue “Persistent and Photostimulable Phosphors” within Optical Materials Express features papers presented at the third International Workshop on Persistent and Photostimulable Phosphors (IWPPP 2015) held at the University of Texas at Arlington.
Highlights
Persistent luminescence is a specific type of luminescence for which the emission is delayed beyond the normal radiative lifetime of the luminescent center
Photons can be used for the detrapping, leading to optically stimulated luminescence (OSL)
Clear challenges lie ahead in terms of a deeper understanding of the trapping mechanism and an associated optimization of the energy storage capacity being crucial for many applications
Summary
Persistent luminescence is a specific type of luminescence for which the emission is delayed beyond the normal radiative lifetime of the luminescent center. The subfield of luminescence research dealing with persistent phosphor – virtually inexisting twenty years ago – became firmly established in 2013, when a markedly stronger relative growth in scientific output was observed compared to ‘general’ luminescence [1]. This might partially be related to the specific forum which was created for researchers in this particular subfield of luminescence. Trap filling in the visible remains an issue for most Cr3+ based persistent phosphors [14] and constitutes one of the main challenges, in addition to the difficulties to obtain the accurate particle sizing required for bioimaging applications
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