Sr₂CeO₄ 荧光粉中高浓度 Eu 的占位及性质的键能方法
The Bond-Energy Method in Site Occupancy and Property of High Concentration Eu in Sr₂CeO₄ Phosphors.
作者信息
Wang Wen Jun, Pan Yu, Zhu Yu Han, Li Ling, Liu Xiao Guang, Noh Hyeon Mi, Jeong Jung Hyun
机构信息
Hubei Collaborative Innovation Center for Advanced Organochemical Materials Ministry-of-Education Key Laboratory for the Synthesis and Applications of Organic Functional Molecules, Hubei University, Wuhan, Hubei, 430062, China.
Department of Physics, Pukyong National University, Busan 608-737, Korea.
出版信息
J Nanosci Nanotechnol. 2019 Feb 1;19(2):1145-1147. doi: 10.1166/jnn.2019.15921.
The low concentration of Eu doped Sr₂CeO₄ phosphors has been widely studied in recent years and in this paper, we researched the properties of high concentration Eu doped in Sr₂CeO₄. The Sr₂CeEu ( = 0, 1%, 10%, 20%) phosphors were obtained by traditional solid-state reaction. Photoluminescence (PL) spectra are characterized the property of samples. PL spectra illustrate that the concentration of Eu increased, the intensity of D-F, D-F₂ increased and intensity of Sr₂CeO₄ host emission intensity was decreased. The phenomenon can be ascribed to the energy transfer from Ce to Eu. When the concentration of Eu is 20%, the completely red emission can be obtained even if no other ions are doped under the excitation wavelength of 350 nm, it is proved that Eu occupied Ce sites rather than Sr site in Sr₂CeO₄ samples. The conclusion we make is due to the value of |Δ| and |Δ| calculated by bond-energy method, the smaller the value, the easier it is for the doped ions Eu to enter the site.
近年来，低浓度铕掺杂的Sr₂CeO₄荧光粉已得到广泛研究，本文研究了高浓度铕掺杂的Sr₂CeO₄的性能。通过传统的固态反应制备了Sr₂CeEu（x = 0、1%、10%、20%）荧光粉。光致发光（PL）光谱表征了样品的性能。PL光谱表明，随着铕浓度的增加，D-F、D-F₂的强度增加，而Sr₂CeO₄主体发射强度降低。这种现象可归因于从铈到铕的能量转移。当铕浓度为20%时，在350 nm激发波长下，即使不掺杂其他离子也能获得完全的红色发射，这证明在Sr₂CeO₄样品中铕占据了铈位而非锶位。我们得出的结论是，根据键能法计算的|Δ|和|Δ|值，该值越小，掺杂离子铕进入该位点就越容易。
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