Spherical porous ZnAl2O4:Eu3+ phosphors: PEG-assisted hydrothermal growth and photoluminescence
✍ Scribed by Xiang Ying Chen; Chao Ma
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 943 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0925-3467
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✦ Synopsis
Spherical porous Eu 3+ -doped ZnAl 2 O 4 phosphors have been prepared by post-annealing the sample at 800 °C for 3 h, which was firstly obtained via a simple PEG-assisted hydrothermal route. The as-prepared ZnAl 2 O 4 :Eu 3+ phosphors were well characterized by means of XRPD, FESEM, TEM, HRTEM, N 2 adsorption and desorption and PL techniques. The experimental results reveal that the amount of PEG 2000 in solution plays the crucial role in the formation of spherical porous ZnAl 2 O 4 :Eu 3+ phosphors. The N 2 adsorption and desorption data reveal the mesoporous property of ZnAl 2 O 4 :Eu 3+ phosphors, having the high surface area of 40.02 m 2 g À1 . The photoluminescent excitation and emission spectra illustrate the red-emitting property of ZnAl 2 O 4 :Eu 3+ phosphors owing to the characteristic transitions of Eu 3+ from 5 D 0 ? 7 F j (j = 0, 1, 2, 3, and 4).