Abstract
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 N2* molecules (gas component) is quenched. The NO2− ion is known to be an efficient quencher of Tb3+ ion luminescence by the mechanism of radiationless energy transfer in solutions. That quenching takes place when a crystalline quencher is in contact with a crystalline phosphor and also with a gaseous (molecular) phosphor seems to indicate that the excitation energy is transferred not only within individual crystals but also between contacting surfaces of the phosphor and quencher and at the gas-solid interface.
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