Effect of crystal nature on upconversion luminescence in Er[sup 3+]:ZrO[sub 2] nanocrystals

Patra, Amitava; Friend, Christopher S.; Kapoor, Rakesh; Prasad, Paras N.
July 2003
Applied Physics Letters;7/14/2003, Vol. 83 Issue 2, p284
Academic Journal
The effects of crystal size and crystal phase on the upconverted emission of Er[SUP3+] in ZrO[SUB2] oxidenanocrystals are reported. Green (550 nm) and red (670 nm) upconversion emission were observed at room temperature from the [SUP4] S[SUP3/2] and F[SUB9/2] levels of Er[SUP3+] ZrO[SUB2] nanocrystals. It is found that at 850 mW of cw excitation power, the total luminescence was 11960 Cd/m[SUP2] for 1000 °C heated sample. We observed that the overall upconversion luminescence intensity depends on crystal structure and particle size. We have also confirmed that upconversion process in all these samples results from a two-photon excited-state absorption process.


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