Abstract
Numerous technologies are in use today that employ solid state luminescent materials that are excited by high-energy sources, such as X-rays, cathode rays, or vacuum ultraviolet (VUV) photons. Absorption of this energy results in the formation of electron-hole (e-h) pairs in the host material. In a doped phosphor, this energy must be transferred to the activator for luminescence to occur. The overall efficiency of host-sensitized luminescence is therefore dictated by the efficiency of energy transfer, in addition to the activator quantum efficiency. Studies of host-sensitized luminescence tend to focus on the overall efficiency, while there are fewer reports of systematic investigations aimed at quantifying the energy transfer step. Even so, important experimental and theoretical progress has been made toward improving our understanding of these processes. In this review the development of the field is discussed, with a particular focus on the study of host-to-activator energy transfer.
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