| Autor: |
Yong Il Jeon, Jea Su Yu, L. Krishna Bharat |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Journal of Alloys and Compounds. 620:263-268 |
| ISSN: |
0925-8388 |
| DOI: |
10.1016/j.jallcom.2014.09.135 |
| Popis: |
Eu 3+ /Dy 3+ ions co-doped Ca 2 La 8 (GeO 4 ) 6 O 2 (CLGO) phosphors were prepared by a pechini-type sol–gel method. The structural and morphological studies of the CLGO phosphors were carried out by measuring X-ray diffraction patterns and scanning electron microscope images. The photoluminescence (PL) spectra of the CLGO:Eu 3+ phosphor exhibited the intense red emission due to the electric-dipole transition while the CLGO:Dy 3+ phosphor showed the blue ( 4 F 9/2 → 6 H 15/2 ) and yellow ( 4 F 9/2 → 6 H 13/2 ) emissions with almost equal intensities. The Eu 3+ /Dy 3+ ions co-doped CLGO phosphor showed the improved white light by shifting towards the warm white region. The energy transfer from Dy 3+ to Eu 3+ ions was investigated by means of PL intensities. The lifetime measurements were also performed for single-doped and co-doped samples. The calculated chromaticity coordinates indicated that these phosphors may be suitable for the fabrication of near-UV excitation-based white light-emitting diodes. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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