Abstract
Understanding the factors that govern efficient host-sensitized luminescence remains an important element in the development of more efficient luminescent materials. In a doped phosphor system, absorption of high energy photons leads to the creation of an electron-hole (e-h) pair in the host that must be captured by the dopant for emission to occur. While many materials have been developed for these applications, fundamental questions remain regarding the details of this energy transfer process. One aspect of research in this field that has not received much systematic attention is the study of the role various defects play in decreasing the efficiency of phosphors under host-sensitized excitation. The work presented here focuses on the effect of oxygen vacancies in rare earth doped YBO3 and YPO4, which are created via doping with Ca2+. Excitation and reflectance spectroscopy are combined to quantify the fraction of e-h pairs that are trapped by a dopant. The impact of oxygen vacancies depends on the particular rare earth present in the host, which is likely related to differences in the e-h trapping mechanism.
Published Version
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