论文成果
Luminescent properties of Eu2 in BaCdP2O7: Eu2 phosphor: Experimental and theoretical analysis
- 发布时间：2024-12-23
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- 关键字：Photoluminescence
- 摘要：The luminescent properties of Eu2 ions are strongly influenced by their occupied position in host. In this paper, the luminescent properties of Eu2 in BaCdP2O7: Eu2 phosphor were studied from experimental and theoretical aspects. BaCdP2O7: xEu(2 ) (0.01 <= x <= 0.06) phosphors, synthesized by a solid-state reaction method under CO atmosphere, exhibited a strong asymmetric blue-green emi at 445 nm. X-ray powder diffraction (XRD) characterization and the Rietveld structural refinements for BaCdP2O7 show that there are a 9-coordinated Bat(2 ) lattice site and a 6-coordinated Cd2 lattice site in BaCdP2O7 compound. The emi spectrum can be fitted well by two Gaussian peaks at 436 nm and 487 nm, implying that both Ba2 and Cd2 lattice sites may be occupied by Eu2 ions. The calculation using the empirical Van Uitert equation further qualitatively reveals that Eu2 occupies both Ba2 and Cd2 sites, and then emits blue (436 nm) and green (487 nm) light, respectively. Furthermore, above results are also confirmed by the results of the periodic density-functional theory (DFT) and activation energy (Ea) calculations. Namely, our simulations and experiments simultaneously provide the proof that Eu2 can replace both Ba2 and Cd2 to be a blue-green phosphor. In addition, concentration quenching mechanism, temperature-dependent luminescence and CIE chromaticity coordinate of the BaCdP2O7: Eu2 phosphors were also investigated in this work. All the results indicate that BaCdP2O7: Eu2 phosphor is a potential blue-green phosphor for near ultraviolet-based white-emitting diodes (WLEDs).
- 卷号：149
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- 是否译文：否