Abstract
Abstract Enhanced cooperative absorption and upconversion emission of Yb 3+ pairs in nanocrystalline YAG is observed. The nanocrystallites synthesized by a modified sol–gel method have an average size of 96 nm. The estimated concentration normalized ratio of maximum visible absorption to maximum IR absorption emission of 7.55 × 10 −22 cm 3 is about four orders of magnitude higher than the highest reported value to date, and more than seven orders higher than for bulk monocrystalline YAG:Yb 3+ . Strong cooperative upconversion emission is observed under IR pump at 940 nm.
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