| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1494861 | Optical Materials | 2013 | 5 Pages |
Aluminum oxide films doped with CeCl3, EuCl3, CeCl3/EuCl3 and CeCl3/EuCl3/TbCl3 were deposited by ultrasonic spray pyrolysis. The films were analyzed by X-ray diffraction (XRD). The XRD results revealed that the films are predominantly amorphous independent of dopants. The optical spectroscopy of these films was performed through photoluminescence spectra and decay times. Non-radiative energy transfers from Ce3+ to Tb3+ and from Ce3+ to Eu3+ take place when the films are excited at 280 nm. Excitation at 280 nm fits to the requirements of AlGaN-based LEDs. In the 89Al2O3⋅5CeCl3⋅3EuCl3⋅3TbCl3 film the simultaneous emission of the activators (Tb3+ and Eu3+) and sensitizer (Ce3+) leads to yellowish-green light emission with CIE1931 chromaticity coordinates, x = 0.32 and y = 0.52. This type of thin films might contribute to the development of AlGaN-based LEDs pumped phosphors for solid-state yellowish-green lighting.
► Al2O3 films are optically co-activated with Ce3+/Eu3+ (AO5Ce3Eu) and Ce3+/Eu3+/Tb3+ (AO5Ce3Eu3Tb). ► Non-radiative energy transfer (ET) Ce3+ → Eu3+ takes place in AO5Ce3Eu film. ► Non-radiative ET from Ce3+ to Eu3+ and Tb3+ takes place in AO5Ce3Eu3Tb film. ► Yellowish-green light is generated by AO5Ce3Eu3Tb film pumped with 280 nm-UV light (AlGaN–LEDs).
