Bifunctional samarium activated red-emitting and thermal resistant phosphor for simultaneous field emission displays and white light-emitting diodes
| Autor: | Mebrouka Boubeche, Wasim Ullah Khan, Zhiqi Ye, Tian Shi, Waheed Ullah Khan, Dilfaraz Khan, Yueli Zhang |
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| Rok vydání: | 2022 |
| Předmět: |
Materials science
Photoluminescence Dopant Process Chemistry and Technology Analytical chemistry chemistry.chemical_element Phosphor Color temperature Surfaces Coatings and Films Electronic Optical and Magnetic Materials Samarium Field electron emission symbols.namesake chemistry Materials Chemistry Ceramics and Composites symbols Thermal stability Raman spectroscopy |
| Zdroj: | Ceramics International. 48:5689-5697 |
| ISSN: | 0272-8842 |
| Popis: | A series of Sm3+-activated Ca3Gd(AlO)3(BO3)4 red-emitting phosphors were prepared by a traditional high-temperature solid-state approach. They were characterized by XRD refinements, TEM, SEM, EDS, DRS, FTIR, Raman spectra, photoluminescence (PL) spectra, and fluorescence decay curves. The microstructure of the cation-borate phosphors and the presence of Sm3+ dopants, and their impact at the Ca and Gd sites were studied. All the samples exhibited bright red emissions caused by intra-4f transitions of Sm3+ ions when excited at 404 nm. The optimum dopant concentration was 4mol%, and the concentration quenching (CQ) process was driven by dipole-dipole interaction using Inokuti-Hirayama, and Dexter theories. Interestingly, the temperature-dependent PL spectra manifested that the resulting phosphor had excellent thermal stability with an activation energy of 0.234 eV. Ultimately, the investigated phosphor demonstrated excellent chemical stability. The Sm3+-doped CGAB:Sm3+ phosphor can convert NUV LED chips into intense red emission with Commission Internationale de l’Eclairage (CIE) diagrams of 0.615, 0.382 and high color purity of up to 95.6%. The WLED containing CG0.96AB:0.04Sm3+ merged with the commercial phosphors revealed low correlated color temperature (CCT≈4197 K) and high color rendering index (CRI≈89.7). |
| Databáze: | OpenAIRE |
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