The luminescence of AWO 4 scheelites (A = Ba, Sr, Ca) shows large variations in thermalquenching behavior.
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The luminescence of AWO4 scheelites (A = Ba, Sr, Ca) shows large variations in thermalquenching behavior. The photoluminescence of CaWO4 only drops by a few percent when heated from 90 K to 270 K, while that of SrWO4 decreases by ~90% over the same temperature interval. The luminescence of BaWO4 is completely quenched by 90 K. How do you rationalize the observed increase in thermal quenching as the size of the alkalineearth ion increases?
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As the size of the A 2 cation increases the AO bonds will become longer and this ...View the full answer
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Related Book For 
Solid State Materials Chemistry
ISBN: 9780521873253
1st Edition
Authors: Patrick M. Woodward, Pavel Karen, John S. O. Evans, Thomas Vogt
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