Crystal structure and photo-luminescence of Gd3Ga2(Al3-Si )(O12-N ):Ce3+ phosphors for AC-warm LEDS
| Autor: | Changxing Yang, Jiejun Ren, Jiantao Wang, Aijun Mao, Zhengyan Zhao, Yuhua Wang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Nephelauxetic effect
Materials science General Chemical Engineering Energy level splitting Analytical chemistry Phosphor 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences law.invention Persistent luminescence law Environmental Chemistry Emission spectrum 0210 nano-technology Luminescence Light-emitting diode Solid solution |
| Zdroj: | Chemical Engineering Journal. 368:924-932 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2019.02.185 |
| Popis: | Solid solution phosphors Gd3Ga2(Al3-ySiy)(O12-yNy):Ce3+ were synthesized by introducing [Si4++N3–]/[Al3++O2–] co-substitution into the lattice of Gd3Ga2Al3O12:Ce3+. Gd3Ga2Al3O12:Ce3+, characteristic as outstanding light yield (about 50–60 kPh/ MeV), and has been applied in computer tomography (CT), positron emission tomography (PET) nuclear medical detector, et al. With the increase of y value, the coordination environment around Gd3+(Ce3+) shrinked, which were confirmed by combining techniques of structure refinement, energy- dispersive spectrum, elements distribution mapping. As a result, stronger 5d orbital nephelauxetic effect (ec) and bigger 5d energy level splitting (ecfs) were induced. Thus resulting in longer wavelength of excitation and emission from Ce3+, and broadening of emission spectra. The typical sample Gd2.95Ga2Al2.5Si0.5O11.5N0.5:0.05Ce3+ (GGASON0.5:Ce3+) exhibits sufficient red component and persistent luminescence(>10 ms), enables fabrication of warm white light suited for alternating-current (AC) when combined with blue light chip (460 nm). |
| Databáze: | OpenAIRE |
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