A potential red-emitting phosphor Ca2YTaO6:Eu3+: Luminescence properties, thermal stability and applications for white LEDs
| Autor: | Leyan Shan, Bin Deng, Ruijin Yu, Shuo Pang, Ka Ding, Pengfei Sun, A. Siru, Yaqi Zhang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Doping Analytical chemistry Phosphor 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Tantalate law.invention Geochemistry and Petrology law Thermal stability Emission spectrum 0210 nano-technology Luminescence Light-emitting diode Diode |
| Zdroj: | Journal of Rare Earths. 39:749-756 |
| ISSN: | 1002-0721 |
| DOI: | 10.1016/j.jre.2020.07.006 |
| Popis: | A novel red-emitting phosphor tantalate Ca2YTaO6:Eu3+ was synthesized by a solid-state reaction. The purity and surface morphology of the phosphors were characterized. The Ca2YTaO6:Eu3+ phosphors show a sharp emission peak at 612 nm under near-ultraviolet (n-UV) at 395 nm because of the 5D0 → 7F2 transition of Eu3+. The optimal Eu3+ doping concentration in Ca2YTaO6 is 40 mol% and the critical energy-transfer distance of Eu3+ ions was calculated to be 0.9 nm. The emission spectra of Ca2YTaO6:Eu3+ from 300 to 480 K were investigated. The thermal-quenching temperature (T0.5) of Ca2YTaO6:Eu3+ is above 480 K. The color purity of Ca2YTaO6:40 mol%Eu3+ is as high as 99.8%. The luminescence lifetime of Ca2YTaO6:40 mol%Eu3+ was also discussed. The high color purity and high thermal stability of Eu3+-doped Ca2YTaO6 phosphors contribute to its application value in white light-emitting diodes (w-LEDs). |
| Databáze: | OpenAIRE |
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