| Autor: |
Patra, Amitava, Friend, Christopher S., Kapoor, Rakesh, Prasad, Paras N. |
| Předmět: |
|
| Zdroj: |
Applied Physics Letters; 7/14/2003, Vol. 83 Issue 2, p284, 3p, 2 Diagrams, 2 Graphs |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
