2025/12/31 by Jingyi Jing, X Wang, Xiankai Wang +4 · 1 citation
Materials Science · Energy · #Luminescence Properties of Advanced Materials #Carbon and Quantum Dots Applications #Advanced Photocatalysis Techniques
paper · doi:10.1021/acs.inorgchem.5c05022
With their tunable multicolor light emission and ability to sense temperature optically, single-host multifunctional materials offer great practical promise and are thus the subject of extensive study. This study adopted a two-step approach─first a carbonation method, then a double-crucible carbon reduction process─to prepare CaO:Eu 2+/3+,Tb 3+,Cl – phosphor, which crystallizes in a face-centered cubic structure with the space group Fm- 3 m . Under ultraviolet excitation, the phosphors simultaneously emit blue light (Eu 2+ ), green light (Tb 3+ ), and red light (Eu 3+ ). Notably, the introduction of Tb 3+ ions, which serve as an energy bridge, not only contributes the green emission but also enhances the intensity of red light associated with the Eu 3+ ions. Therefore, tuning the Tb 3+ doping concentration allows the CaO:Eu 2+/3+,Tb 3+,Cl – phosphor to produce white light. Additionally, tunable luminescence is achievable through adjusting either the excitation wavelength or the Tb 3+ concentration, and this characteristic greatly improves the material’s applicability. As a consequence, the as-fabricated CaO:0.01 Eu 2+/3+,0.008 Tb 3+,0.06 Cl – phosphor is a promising candidate for white light-emitting diodes (WLEDs), display technologies, and optical anti-counterfeiting applications. Moreover, the material exhibits non-contact temperature sensing capability, facilitated by the fluorescence intensity ratio (FIR) method. Based on the calculated absolute (S a ) and relative sensitivities (S r ), the CaO:Eu 2+/3+,Tb 3+,Cl – phosphor also exhibits potential application value in optical thermometry.