Abstract
The quantum efficiency of Y2O3:Eu+3, ScBO3:Eu+3 and LaBO3:Eu+3 has been measured between 77 and 740°K. It is found that the decrease in quantum efficiency as the temperature is raised is most rapid for LaBO3:Eu+3 and least rapid for Y2O3:Eu+3. Measurements of the lifetime of the 5D0 level of Eu+3 over this temperature range indicates that for LaBO3: Eu+3 and Y2O3:Eu+3 the lifetime is essentially independent of temperature while for ScBO3:Eu+3 the lifetime decreases as the temperature increases. In all three materials, however, non-radiative transitions from the 5D0 level to the 7F levels do not contribute significantly to the observed decrease in quantum efficiency with increasing temperature. Ultra-violet reflectivity measurements made on both the doped and undoped materials as a function of temperature indicate that the loss in quantum efficiency is not due to host absorption of exciting light; but instead is correlated with the position of the ultra-violet absorption band of the host.
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