Photoluminescence and photocurrent characteristics of Sr1−xBaxAl2O4: Eu2+, Ni2+ phosphors
| Autor: | Eung-Joon Kim, Jung Hwan Kim, Ha Da Jang, Hyung-Bock Lee, Seiki Kim |
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| Rok vydání: | 2012 |
| Předmět: |
Photocurrent
Materials science Photoluminescence Band gap Process Chemistry and Technology Doping Analytical chemistry Mineralogy Phosphor Surfaces Coatings and Films Electronic Optical and Magnetic Materials Crystallinity Tridymite Materials Chemistry Ceramics and Composites Monoclinic crystal system |
| Zdroj: | Ceramics International. 38:S577-S580 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2011.05.101 |
| Popis: | Effects of crystal structure on the photoluminescence (PL) and photocurrent (PC) characteristics of Sr 1− x Ba x Al 2 O 4 : Eu 2+ , Ni 2+ phosphors were investigated as a function of Ba 2+ content (0.1 ≤ x ≤ 0.5) and/or type of doping ions. PL of the specimens was blue-shifted with Ba 2+ content. With increasing of Ba 2+ content, the PC of the specimens was increased up to x = 0.3 and then decreased. These results could be attributed to crystallinity and structural changes from monoclinic spinel (0.1 ≤ x ≤ 0.3) to hexagonal tridymite (0.4 ≤ x ≤ 0.5). With doping of Ni 2+ ion, the response time of PC was remarkably shortened while the intensity of PL was slightly decreased to the incident light, which are due to the formation of trap energy level in the band gap generate from Ni 2+ ion. |
| Databáze: | OpenAIRE |
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