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您的检索式：作者名="Pingyuan Yan"
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| 1 | Observation of electron–phonon coupling and linear dichroism in PL spectra of ultra-small CsPbBr3 nanoparticle solution显示文摘Blue-emission(~480 nm)CsPbBr3 nanoparticles with ultra-small size(~2.1 nm)are synthesized using the liquid nitrogen freezing with the ligand of dodecylbenzene sulfonic acid(DBSA).Asymmetric narrow emissions at the low energy side,with the full width at half-maximum of~20 nm,are observed in solution and film at room temperature.The spectral asymmetry is mainly ascribed to phonon vibronic replica with averaged phonon energy of~40 meV.Moreover,exciting this CsPbBr3 nanoparticles solution using linearly polarized 6 ns pulsed laser at 355 nm,we observe polarized emission with polarization degree(PPL)of~7%,and PPL decreases more than 20%in the vibronic progression.However,the PPL goes to zero in frozen solutions as well as in films.Thus we speculate the polarized emission is due to the photoinduced re-alignment of nanoparticles,and the diminished PPL at the phonon side band may be due to the non-adiabatic electronic-to-vibronic transitions.The novel phenomena from the ultra-small CsPbBr3 nanoparticle demonstrated in this work may provide fundamental insights into its photophysics with direct implications for optoelectronics. | Chengqiang Wang Tao Song Pingyuan Yan Shu Hu Chenhong Xiang Zihan Wu Heng Li Haibin Zhao Lili Han Chuanxiang Sheng | 2023 | eScience2023，3，6： | 0 |
| 2 | Preparation of Nb3Al superconductor by powder metallurgy and effect of mechanical alloying on the phase formation显示文摘Adoption of powder-in-tube method to fabricate superconducting wire can realize a large application of Nb3Al prepared by powder metallurgy. Powder metallurgy was used to synthesize Nb3Al under various heat-treatment conditions, annealing temperature was varied from 700 to1,000 °C and heating time was varied from 10 to 50 h.X-ray diffraction patterns reveal that a reaction between Nb and Al took place and formed NbAl3phase. Under current heat-treatment conditions(annealing temperature was varied from 700 to 1,000 °C and heating time was varied from 10 to 50 h), NbAl3was so stable that it did not further react with the unreacted Nb and was not sensitive to the heat-treatment condition. By mechanical alloying, adoption of high-energy ball milling significantly decreases particle size and enhances surface free energy, which promotes the formation of Nb3Al phase. X-ray diffraction patterns indicate that relatively pure Nb3Al phase was obtained under the same heat-treatment condition. Energy-dispersive X-ray analysis measurement demonstrates that the obtained samples were close to the right stoichiometry of A15 structure Nb3Al. | Zhao Liu Yongliang Chen Lupeng Du Pingyuan Li Yajing Cui Xifeng Pan Guo Yan | 2014 | Journal of Modern Transportation2014，22，1： | 0 |
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