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Lines of Ne (3p-3s, 550–800 nm) and Xe (6p-6s, 800–1050 nm; 7p-6s, 475 nm) have been detected in the mechanoluminescence spectrum of terbium and cerium sulfate crystallohydrates. The luminescence of noble gas is observed jointly with the known bands of Ce3+ and Tb3+ ions and N*2 lines. The lines corresponding to excited Xe+ ions (500–550 nm), indicative of achievement of electric-field strengths on...
It is found that the addition of NaNO2 to Tb2(SO4)3 · 8H2O crystals quenches tribo- and photo-luminescence from the latter. In the case of triboluminescence, the glow of both Tb3+* ions (solid component of triboluminescence) and N 2* molecules (gas component) is quenched. The NO 2− ion is known to be an efficient quencher of Tb3+ ion luminescence by the mechanism of radiationless energy transfer...
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