Abstract
Concentration quenching of the 1.06-μ Nd3+ fluorescence in glass is investigated to help determine the nature of the Nd3+–Nd3+ interaction that causes quenching. The relative fluorescent efficiency vs Nd3+ concentration is measured for thin, polished plates of glass in an apparatus designed to minimize instrumental distortion of the resulting curve. Fluorescent efficiency decreases exponentially with increasing Nd3+ concentrations for concentrations less than 13 × 1020 cm−3 but deviates from the exponential at higher concentrations. Comparison between the data and theoretical curves indicates that Nd3+ concentration quenching cannot be described by a dipole–dipole interaction, by the Perrin model, or by the Stern-Volmer model. Interactions that can describe the data are exchange interactions, multipole–multipole interactions of higher order than the dipole–dipole, and the Johnson–Williams model.
© 1968 Optical Society of America
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