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Featured researches published by Yiyao Ge.


RSC Advances | 2016

Synthesis of Er3+-doped perovskite nanorods with outstanding UC PL behavior

Yiyao Ge; Yongjie Zhao; Xuanyi Yuan; Siyuan Sun; Yuzhen Zhao; Heping Zhou

The Er-doped perovskite single-crystal NaNbO3 nanorods with a series of doping content (0–1 wt%) were successfully synthesized by hydrothermal method. The XRD and Raman analyses indicated that the Er3+ ion firstly entered into the B site (Nb5+) in the ABO3 perovskite structure and then the A site (Na+) with a further increase of Er-doping content. High-resolution transmission electron microscopy (HRTEM) was employed to demonstrate the single-crystal features of NaNbO3 nanorods. The as-synthesized Er-doped NaNbO3 nanorods exhibited excellent up-conversion (UC) photoluminescence (PL) behavior. The strong green emission and the weak red emission of Er3+ were observed in the UC PL spectra. The maximum emission intensity of the UC PL spectrum was achieved in NaNbO3 nanorods with 0.5 wt% of Er3+ doped. Furthermore, the UC PL spectra obtained under different laser input powers confirmed that two photons contributed to the observed up-conversion luminescence properties. Owing to these luminescent merits, the as-synthesized Er-doped single-crystal perovskite NaNbO3 nanorods exhibit potential application in novel multifunctional devices.


RSC Advances | 2016

Up-conversion luminescence behaviors in Er3+ doped single crystal KNbO3 nanosheets

Siyuan Sun; Yiyao Ge; Yongjie Zhao; Xuanyi Yuan; Yuzhen Zhao; Heping Zhou

Perovskite oxides have attracted much attention owing to their excellent physical properties, such as piezoelectricity, ferroelectricity, and ferromagnetism. Moreover, these properties can be strongly affected and regulated by the doping strategy. In this work, Er3+ doped single crystal KNbO3 nanosheets were successfully synthesized via a solvothermal method. XRD analysis indicated that Er3+ firstly substituted into the B site (Nb5+) and then A site (K+) in the ABO3 perovskite structure with the further increasing content of Er3+. The orthorhombic structure of the pure KNbO3 and Er3+ doped KNbO3 was proved in terms of the Raman spectra. The SEM observation demonstrated that the size of the as-obtained nanosheets was about 70 nm in thickness and 3 μm in diameter. The single crystal structure state of the as-obtained products was confirmed by HRTEM. Furthermore, the growth mechanism of Er3+ doped KNbO3 nanosheets was rationally elaborated and proposed. The as-obtained Er3+ doped KNbO3 nanosheets exhibited excellent up-conversion (UC) photoluminescence (PL) properties with a strong green emission and a weak red emission. The maximum emission intensity of the UC PL spectrum was achieved with 0.4 mol% of Er3+ doped. To conclude, the as-synthesized Er3+ doped KNbO3 nanosheets could be a potential candidate for the development of multifunctional devices, by introducing PL properties to piezoelectric KNbO3 materials.


Journal of the American Ceramic Society | 2015

Preparation of Spherical AlN Granules Directly by Carbothermal Reduction–Nitridation Method

Qi Wang; Wei Cui; Yiyao Ge; Kexin Chen; Zhipeng Xie


Journal of Power Sources | 2016

Fe2O3 nanocubes exposed (012) active facets combination with graphene rendering enhanced lithium storage capability

Yongjie Zhao; Dong Yan; Caihua Ding; Dezhi Su; Yiyao Ge; Yuzhen Zhao; Heping Zhou; Jingbo Li; Haibo Jin


Journal of Alloys and Compounds | 2016

Effect of NH4Cl additive on combustion synthesis of Eu-doped Ca-α-SiAlON phosphors

Yiyao Ge; Ying Chen; Qi Wang; Wei Cui; Yifeng Zou; Zhipeng Xie; Xuanyi Yuan; Kexin Chen


Journal of the American Ceramic Society | 2015

Microstructure and Thermo-Kinetics Analysis in Combustion Synthesis of Si3N4 with High α-Phase Content

Yiyao Ge; Wei Cui; Qi Wang; Yifeng Zou; Zhipeng Xie; Kexin Chen


Journal of Alloys and Compounds | 2016

Comprehensive investigation of Er2O3 doped (Li,K,Na)NbO3 ceramics rendering potential application in novel multifunctional devices

Yongjie Zhao; Yiyao Ge; Xiaowen Zhang; Yuzhen Zhao; Heping Zhou; Jingbo Li; Haibo Jin


Ceramics International | 2015

Carbothermal synthesis of spherical AlN granules: Effects of synthesis parameters and Y2O3 additive

Qi Wang; Wei Cui; Yiyao Ge; Kexin Chen; Zhipeng Xie


Journal of Alloys and Compounds | 2016

Carbothermal synthesis of micro-scale spherical AlN granules with CaF2 additive

Qi Wang; Yiyao Ge; Wei Cui; Kexin Chen; J.M.F. Ferreira; Zhipeng Xie


Journal of the American Ceramic Society | 2015

Crystal Growth in the Combustion Synthesis of α-Si3N4 Using Si with Different Particle Sizes

Yiyao Ge; Qi Wang; Wei Cui; Yifeng Zou; Zhipeng Xie; Kexin Chen

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Qi Wang

University of Science and Technology Beijing

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Xuanyi Yuan

Renmin University of China

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