Abstract
Optical excitation of a Dy3+-activated phosphor is difficult to achieve because the excitation through the f-d transition of Dy3+ ions requires photons of energy greater than 7 eV, which are not available from usual UV lamps or lasers. Also, because the oscillator strength of f−f transitions is <10−6, a strong source of excitation is required to excite Dy3+ ions through f−f transitions. We have observed Dy3+ emission in two host lattices, CaSO4 and CaF2 under 337-nm excitation from a nitrogen laser, through excitation of f−f transitions.
© 1991 Optical Society of America
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