We report experimental results on the variation of the radiative lifetime of Eu³⁺ ion embedded in a dielectric with the refractive index n. We dope 1 mol % of Eu³⁺ into the binary glass system xPbO-(1-x)B₂O₃. By varying x we have achieved a fairly large variation of the refractive index from 1.7 to 2.2. This enables us to study the local field effects for the first time for ions doped in a solid glassy material. Our measurements are in agreement with the so-called real cavity model. The present measurements are free from the complications arising from reorganizational effects in solvents.
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Kumar et al. (2003) studied this question.
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