期刊
CERAMICS INTERNATIONAL
卷 48, 期 22, 页码 33143-33150出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.07.251
关键词
Phosphor; Bi3+doping; Rietveld refinements; Double-site emission; White-light white-light-emitting diode
资金
- National Natural Science Foundation of China [61974009, 62075055, 62175075]
- Natural Science Foundation of Hebei Province [2020201030]
- Central Project Guide local science and technology for development of Hebei Province [216Z1104G, 226Z1103G]
- Midwest University's comprehensive strength promotion project
- high-performance super-computer center of Hebei University
- Innovation and entre-preneurship training program for college students [2022178]
This study successfully synthesized a series of Sr3Al2O5Cl2:x%Bi3+ phosphors and explained their fluorescence behavior through a two-site-occupying emission mechanism. The study also found that the Sr1 site generated 490nm emission light and the Sr3 site generated 556nm emission light.
Bi3+ ions can regulate and control the fluorescence of a phosphor by transferring energy to the activating agent or occupying different luminescent centers, which is important for modifying phosphors and revealing fluores-cence mechanisms. As a base material, Sr3Al2O5Cl2 has three types of Sr sites (Sr 1, Sr 2, and Sr 3) that may be occupied by Bi3+ ions (Sr2+ has a similar radius to Bi3+). Herein, we successfully synthesized a series of Sr3A-l2O5Cl2:x%Bi3+ phosphors using the high-temperature solid-state method and determined a two-site-occupying emission mechanism. X-ray diffraction patterns indicated that the samples were synthesized well, and Riet-veld refinement results provided their structural information. Photoluminescence spectra showed 490 nm (lambda ex = 345 nm) and 556 nm (lambda ex = 376 nm) emission peaks, which might arise from different luminescent centers. The concentration quenching study, peak separation analysis, fluorescence lifetime spectra, and diffuse reflection spectra indicated that the Bi3+ ions occupied two of the three Sr sites. Calculations of relative system energies and distortion index proved that the occupation only occurred in the Sr 1 and Sr 3 sites, and crystal splitting analysis determined that Sr 1 site generated 490 nm emission light and Sr 3 site generated 556 nm emission light. The charge compensator and flux were added to enhance the fluorescence intensity of the phosphor, and 5% K+ along with 1% BaF2 is the optimal dosage. Finally, the SrAlSiN3:Eu2+, BaMgAl10O17:Eu2+, and optimized Sr3Al2O5Cl2:5%Bi3+ phosphors were combined as a luminous layer and a warm-white light-emitting diode was realized; the color rendering indices were 84.3, 85.8, 86.4, and 86.2 under working currents of 20, 30, 40, and 50 mA, respectively.
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