Electrical and electroluminescence properties of Ca0.6Sr0.4TiO3:Pr thin film: Anomalous current and luminance relaxation
| Autor: | Minoru Hanaya, Makoto Yamada, Toru Kyomen, Junichi Sato, Hiroshi Takashima, Kohei Aramaki |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science business.industry Relaxation (NMR) Direct current Biophysics Phosphor 02 engineering and technology General Chemistry Electroluminescence 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Electromigration Luminance Atomic and Molecular Physics and Optics 0103 physical sciences Electrode Optoelectronics Thin film 0210 nano-technology business |
| Zdroj: | Journal of Luminescence. 200:175-180 |
| ISSN: | 0022-2313 |
| Popis: | An electroluminescent device composed of In2O3:Sn electrode, Ca0.6Sr0.4TiO3:Pr red phosphor with the emission peak at 613 nm, and SnO2:Sb electrode thin films is prepared using a sol-gel and firing method. The electrical and electroluminescence properties are investigated by monitoring the current and luminance. Pulse-like electroluminescence is observed immediately after SnO2:Sb is polarized either negatively or positively. Direct current (DC) electroluminescence is observed only when SnO2:Sb is negatively polarized. During the DC electroluminescence, anomalous relaxation phenomena are observed: the current decreases but the luminance increases with increasing time at a constant voltage. These results are discussed based on Waser's model, which suggests that Ca0.6Sr0.4TiO3:Pr separates into n-type and p-type semiconducting regions due to electromigration of the oxygen vacancies. |
| Databáze: | OpenAIRE |
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