Photoluminescence profiles and fast/slow annealing effects of Eu(III)/Tb(III)-codoped silica phosphor materials
| Autor: | Youngku Sohn, Jun-Gill Kang, Young In Choi, Hee Jung Yoon |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Photoluminescence Annealing (metallurgy) Doping Biophysics Analytical chemistry Nanoparticle Nanotechnology Phosphor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Ion Chemistry (miscellaneous) 0210 nano-technology Luminescence Excitation |
| Zdroj: | Luminescence. 31:821-829 |
| ISSN: | 1522-7235 |
| Popis: | A silica (SiO2) nanoparticle matrix was codoped with luminescent Eu(III) and Tb(III) ions using a modified Stober method. The effects of fast and slow thermal annealing on photoluminescence profile imaging were examined. Slow annealing treatment suppressed more quenching sites than fast thermal annealing to further increase the photoluminescence signals. The photoluminescence signals observed between 450 and 720 nm were assigned to the (5)D(0) → (7)F(J) (J = 0,1,2,3,4) of Eu(III) and the (5)D(4) → (7)F(J) (J = 6,5,4,3) transitions of Tb(III). Photoluminescence was largely sensitized by indirect excitation and was much stronger than that generated by direct excitation. The Eu(III) and Tb(III) ions were doped at lower symmetry sites in the silica matrix. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text