Room temperature cathodoluminescence quenching of Er3+ in AlNOEr
Résumé
This paper reports a cathodoluminescence (CL) spectroscopic study of nanogranular AlNOErx samples with erbium
content, x, in the range 0.5–3.6 at%. A wide range of erbium concentration was studied with the aim of
understanding the concentration quenching of CL. The composition of thin films, deposited by radiofrequency
reactive magnetron sputtering, was accurately determined by Energy Dispersive X-ray Spectroscopy (EDS). CL
emission was investigated in the extended visible spectral range from 350 nm to 850 nm. The critical concentration
of luminescent activator Er3+ above which CL quenching occurs is 1%; the corresponding critical
distance between Er3+ ions in AlNOErx is about 1.0 nm. The quenching mechanism is discussed. We discount an
exchange-mediated interaction in favour of a multipole-multipole phonon-assisted interaction.
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