Publication Date:
2011-04-22
Description:
A novel red-emitting phosphor Ba 1.95 ZnSi 2 O 7 :Eu 0.05 3+ , B x 3+ was prepared by combustion synthesis and an efficient red emission under near-ultraviolet (UV) was observed. The luminescence, crystallinity, and particle sizes were investigated using luminescence spectrometry, X-ray diffractometry, and scanning electron microscopy. The emission spectrum shows that the most intense peak is located at 614 nm, which corresponds to the 5 D 0 → 7 F 2 transition of Eu 3+ . The phosphor has two main excitation peaks located at 394 and 465 nm, which match the emission of UV and blue light-emitting diodes, respectively. The optical absorption spectra of Ba 1.95 ZnSi 2 O 7 :Eu 0.05 3+ , B 0.06 3+ exhibited a band-gap energy of 3.95 eV. The results showed that boric acid was effective in improving the luminescence intensity of Ba 1.95 ZnSi 2 O 7 :Eu 0.05 3+ , and the optimum molar ratio of boric acid to zinc nitrate was about 0.06. The phosphor Ba 1.95 ZnSi 2 O 7 :Eu 0.05 3+ , B 0.06 3+ synthesized by the combustion method showed 1.8 times improved emission intensity compared with that of the Ba 1.95 ZnSi 2 O 7 :Eu 0.05 3+ phosphor under λ ex =394 nm.
Print ISSN:
1546-542X
Electronic ISSN:
1744-7402
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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