期刊
INORGANIC CHEMISTRY
卷 59, 期 7, 页码 4790-4799出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.0c00061
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资金
- Jilin Province/Jilin University Co-Construction Project-Funds for New Materials [SXGJSF2017-3]
- Key Projects of Science and Technology Development Plan of Jilin Province [20190302016GX]
- Changchun Science and Technology Development Plan [17DY019]
- Opening Research Funds Projects of the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry and College of Chemistry, Jilin University [2019-38]
A modified structure Ca(Mg-0.8 Al-0.2)(Si1.8Al0.2)O-6 (denoted as CMASO) from the evolution of CaMgSi2O6 (denoted as CMSO) codoped with Ce3+ and Tb3+ ions was designed successfully by solid reaction method for application in phosphor-converted white-light-emitting diode (pc-wLED). The Rietveld refinement of these two structures verified the changes derived from the replacement of some of the Me2+ and Si4+ ions by Al ions. The band gaps were calculated by density-functional theory (DFT) calculation method to verify the change of Al3+ ions replacing further, and the diffuse reflectance spectra (DRS) proved the veracity of the calculation result. The phosphors CMASO:Ce3+ showed blue emission excited by a wider excitation wavelength from 280 nm to 370 nm. The change of structure lead to the absorbable range broaden and the emission peak shifted to longer wavelength, compared with CMSO:Ce3+, although the amount of emitting center was the same. The reason for these phenomena was discussed in detail. The codoped phosphors CMASO:Ce3+,Tb3+ exhibited different emission colors from blue to green as the concentration of Tb3+ ions increased. Combined with commercial red phosphor CaAlSiN3:Eu2+ and ultraviolet LED (UV-LED) chips, the selected appropriate samples achieved white emission. The correlated color temperature (CCT) was 6137 K and the color rendering index (Ra) was 80.5, indicating that they could act as potential phosphors for possible applications in pc-wLED.
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