Xiangfu Wang

Nanjing University of Posts and Telecommunications

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Yanyan Bu

Nanjing University of Posts and Telecommunications

Xiaohong Yan

Nanjing University of Posts and Telecommunications

Xiaohong Yan

Jiangsu University

Peiqing Cai

China Jiliang University

Chun-Sheng Liu

Nanjing University of Posts and Telecommunications

Lan Meng

Dalian Polytechnic University

Hyo Jin Seo

Pukyong National University

X. H. Yan

China Aerospace Science and Technology Corporation

Yanyan Bu

Nanjing University of Posts and Telecommunications

Jing Wang

Shandong University

Cooperative Institutions

Nanjing University of Posts and Telecommunications

129

Chinese Academy of Sciences

Nanjing University

University of Chinese Academy of Sciences

Nanjing University of Aeronautics and Astronautics

Southeast University

Huazhong University of Science and Technology

Shanghai Jiao Tong University

Nanjing Forestry University

China Jiliang University

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β-Na(Y1.5Na0.5)F6:Tm3+—A blue upconversion phosphor

Journal of Luminescence (2008)

Xiangfu Wang Siguo Xiao Yanyan Bu Xiaoliang Yang Jian Ding

Photon Upconversion

Ultraviolet

Emission intensity

Blue laser

10.1016/j.jlumin.2008.10.012

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Citations (9)

Ultraviolet Light Induced White Emission of Eu³⁺and Dy³⁺Co-Doped Oxyfluoride Glass-Ceramics Containing LaF₃Nanocrystals

Transactions of the Indian Ceramic Society (2015)

Shaojun Cheng Yanyan Bu Xiangfu Wang Xiaohong Yan

Dy3+ single doped and Dy3+-Eu3+ co-doped transparent glass-ceramics (GC) containing hexagonal LaF3 nanocrystals were fabricated by melt-quenching method and subsequent heating. XRD, TEM, absorption and emission spectra were used to investigate the structural and luminescent properties of resulting GC. Excited by 390 nm, the Dy3+-Eu3+ co-doped GC exhibited bright white emission with CIE coordinates 0.345, 0.333. Judd-Ofelt intensity parameters, radiative probability, luminescence branching ratio, cross-sections and effective bandwidth were calculated. The Judd-Ofelt parameters (Ω2, Ω4 and Ω6) have indicated that GC has a high asymmetrical and covalent feature. The resulting GC may be used in the white light emitting diode fields.

Ultraviolet

10.1080/0371750x.2014.980851

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Citations (3)

Modeling and property study of thermoelectric converter based on subwavelength photothermal absorption structure

Physica B Condensed Matter (2023)

Chenyang Guo Shiwei Zhou Yanyan Bu Xiangfu Wang

10.1016/j.physb.2023.415024

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Citations (1)

Fabrication and photoelectric properties of Er³⁺ and Yb³⁺ co-doped ZnO films

Japanese Journal of Applied Physics (2015)

Wei Feng Xiangfu Wang Lan Meng Xiaohong Yan

Abstract In this paper, the Er 3+ and Yb 3+ co-doped ZnO films deposited by a novel thermal decomposition method under different annealing temperature process have been reported. The effects of annealing temperature on the morphology and properties of the films are systematically studied. The resulting spectra demonstrate that the Er 3+ and Yb 3+ co-doped ZnO films possessed the property of up-conversion, converting IR light into visible light that can be absorbed by amorphous silicon solar cell. After all, inner photoelectric effect of the Er 3+ and Yb 3+ co-doped ZnO films in the amorphous as a light scattering layer are also found with an infrared 980 nm laser as excitation source.

Photoelectric effect

10.7567/jjap.55.012302

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Citations (4)

Ultraviolet and infrared photon-excited synergistic effect in Er^3+-doped YbF_3 phosphors

Optics Letters (2011)

Xiangfu Wang Xiaohong Yan

A synergistic effect between UV down-conversion and IR up-conversion is witnessed in YbF3:Er3+ phosphors by employing the dual wavelength (369 nm and 980 nm) excitation source. The synergistic effect originates from an abnormal energy transfer between Er3+ ions, in which the Er3+ ions in metastable states excited by 369 nm photons are excited again by the 980 nm IR photons. The dual wavelength excited red emission intensity is 1.1 times the total red emission intensities from 369 nm and 980 nm single excitation. The synergistic effect refers us to a way to convert both high-energy and low-energy photons into one middle-energy photon with high quantum yield.

Ultraviolet

Quantum yield

10.1364/ol.36.004353

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Citations (34)

Preparation and upconversion properties of Ba2ErF7 and Ba2ErF7:Yb3+ powders

Journal of Luminescence (2009)

Yanyan Bu Siguo Xiao Xiangfu Wang Wenhui Yuan Jianwen Ding

Photon Upconversion

Coprecipitation

Emission intensity

10.1016/j.jlumin.2009.07.020

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Citations (9)

Curvature and ionization-induced reversible hydrogen storage in metalized hexagonal B36

The Journal of Chemical Physics (2014)

Chun-Sheng Liu Xiangfu Wang Xiao-Juan Ye Xiaohong Yan Zhi Zeng

The synthesis of quasiplanar boron clusters (B36) with a central hexagonal hole provides the first experimental evidence that a single-atomic-layer borophene with hexagonal vacancies is potentially viable [Z. Piazza, H. Hu, W. Li, Y. Zhao, J. Li, and L. S. Wang, Nat. Commun. 5, 3113 (2014)]. However, owing to the hexagonal holes, tunning the electronic and physical properties of B36 through chemical modifications is not fully understood. Based on (van der Waals corrected-) density functional theory, we show that Li adsorbed on B36 and \documentclass[12pt]{minimal}\begin{document}${\rm B}^-_{36}$\end{document}B36− clusters can serve as reversible hydrogen storage media. The present results indicate that the curvature and ionization of substrates can enhance the bond strength of Li due to the energetically favorable B 2p-Li 2p orbitals hybridization. Both the polarization mechanism and the orbital hybridization between H-s orbitals and Li-2s2p orbitals contribute to the adsorption of H2 molecules and the resulting adsorption energy lies between the physisorbed and chemisorbed states. Interestingly, the number of H2 in the hydrogen storage medium can be measured by the appearance of the negative differential resistance behavior at different bias voltage regions. Furthermore, the cluster-assembled hydrogen storage materials constructed by metalized B36 clusters do not cause a decrease in the number of adsorbed hydrogen molecules per Li. The system reported here is favorable for the reversible hydrogen adsorption/desorption at ambient conditions.

Orbital hybridisation

10.1063/1.4902062

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Citations (57)

Flexible Planar‐Integrated Micro‐Supercapacitors from Electrochemically Exfoliated Graphene as Advanced Electrodes Prepared by Flash Foam–Assisted Stamp Technique on Paper

Energy Technology (2019)

Qingling Shi Yangjun Xiang Guanghan Ji Debo Wang Xiangfu Wang

One of the key challenges of integrated energy storage devices is to develop a simple, low‐cost, and environmental‐friendly planar patterning technology. Herein, an ingenious and feasible laser‐engraved flash foam–assisted stamp technique of preparing flexible paper‐based planar‐integrated micro‐supercapacitors based on interdigital electrodes of self‐depositing electrochemically exfoliated graphene is proposed. The as‐synthesized flexible paper‐based planar‐integrated graphene micro‐supercapacitors exhibit excellent electrochemical performances with a remarkable area‐specific capacitance of 3.1 mF cm −2 , and an excellent cycling stability in that capacitance retention reaches 95.8% even after 10 000 cycles. Furthermore, the paper‐based graphene micro‐supercapacitors are bent at different angles without significant electrochemical performance loss, and thus have outstanding mechanical flexibility. Therefore, such flexible paper‐based planar‐integrated graphene micro‐supercapacitors are expected to be applied in flexible wearable and portable electronics.

Flexible Electronics

10.1002/ente.201900664

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Citations (10)

Excitation powder dependent optical temperature behavior of Er^3+ doped transparent Sr_069La_031F_231 glass ceramics

Optics Express (2016)

Xiangfu Wang Qing Liu Peiqing Cai Jing Wang Lin Qin

The knowledge of the pump power for which the population of thermally coupled energy levels (TCL) changes with power increase is of valuable importance for optical temperature sensors. In this paper, novel Er3+ doped transparent Sr0.69La0.31F2.31 glass ceramics was fabricated successfully, and its structure is studied by XRD, TEM and HRTEM analyses. The 2H11/2/4S3/2, 4F9/2(1)/4F9/2(2), and 4I9/2(1)/4I9/2(2) levels of Er3+ are proved as TCL by analyzing the temperature dependent fluorescence intensity ratios. The spectrum split, thermal quenching ratio, population stability, and temperature sensitivity from three TCL are observed to be dependent on the pump power. A new fitting method has been developed to establish the relation between fluorescence intensity ratios and temperature. It is found that the combined use of 2H11/2/4S3/2 and 4F9/2(1)/4F9/2(2) as thermally coupled energy levels will get a more precise temperature reading from 62.7 K to 800 K with the help of low excitation power at 66.8 mW/mm2.

10.1364/oe.24.017792

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Citations (103)

Effect of full-endoscopic cervical laminectomy and decompression versus anterior cervical decompression with fusion in the treatment of patients with cervical spondylotic myelopathy: A protocol for systematic review and meta-analysis

Binglin Ye Shuling Li Fengqi Sun You-Fu Fan Weiguo Chen

Review question / Objective: This systematic review aims to comprehensively assess the efficacy and safety of full-endoscopic cervical laminectomy and decompression versus anterior cervical decompression with fusion in treating cervical spondylotic myelopathy (CSM) patients. Condition being studied: Cervical spondylotic myelopathy (CSM) is a degenerative disease associated with cervical cord compression, which has increased significant health-related social costs and derived disabilities. Anterior cervical discectomy and fusion (ACDF) is the "gold standard" for the treatment of CSM. However, the application of ACDF may cause some complications. Recently, full-endoscopic cervical laminectomy and decompression have shown potential therapeutic effects for CSM. However, no systematic review or meta-analysis has focused on the effects of full-endoscopic cervical laminectomy and decompression in the treatment of CSM. This systematic review aims to comprehensively assess the efficacy and safety of full-endoscopic cervical laminectomy and decompression versus anterior cervical decompression with fusion in treating CSM patients.

10.37766/inplasy2021.8.0034

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Citations (0)