980 nm excited upconversion in an Er-doped ZnO–TeO[sub 2] glass

Vetrone, Fiorenzo; Boyer, John-Christopher; Capobianco, John A.; Speghini, Adolfo; Bettinelli, Marco
March 2002
Applied Physics Letters;3/11/2002, Vol. 80 Issue 10, p1752
Academic Journal
In this letter, we investigate the upconversion properties of 19ZnO–80TeO[sub 2]–1Er[sub 2]O[sub 3] glass after excitation into the [sup 4]I[sub 11/2] level using 980 nm radiation. At an excitation power density of 880 W/cm2, green emission [([sup 2]H[sub 11/2], [sup 4]S[sub 3/2])→[sup 4]I[sub 15/2]] dominates the upconversion spectrum with an efficiency of 0.16%. Temporal studies reveal that the [sup 4]I[sub 11/2] level is the intermediate state by which the two-step upconversion process occurs. Excited-state absorption and phonon-assisted energy transfer are discussed as possible mechanisms for the upconversion. © 2002 American Institute of Physics.


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