Guozhong Ren

Changchun Normal University

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Qibin Yang

Xiangtan University

Changfu Xu

Xiangtan University

Songjun Zeng

Hunan Normal University

Baojiu Chen

Dalian Maritime University

Chunhui Su

Changchun University of Science and Technology

Mengjie Zhao

Shaanxi University of Science and Technology

Qinlei Wei

Changchun Normal University

Chaoyu Ma

Changchun Normal University

Qingyu Meng

Dalian Maritime University

Hongbo Zhang

Changchun University of Science and Technology

Cooperative Institutions

Chinese Academy of Sciences

Xiangtan University

Jilin University

Dalian Maritime University

Institute of Modern Physics

University of Chinese Academy of Sciences

Changchun Normal University

Hunan Normal University

Changchun Institute of Optics, Fine Mechanics and Physics

National Institute for Materials Science

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Relationship between microstructure and the achieving of the single-band red upconversion fluorescence of Er3+/Yb3+ codoped crystallites

Journal of Alloys and Compounds (2007)

Yunxin Liu Qibin Yang Guozhong Ren Changfu Xu Yong Zhang

Photon Upconversion

Laser diode

10.1016/j.jallcom.2007.11.131

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Citations (26)

Judd–Ofelt analysis of spectroscopic properties of Tm3+, Ho3+ doped GdVO4 crystals

Optical Materials (2006)

Yanmin Yang Baoquan Yao Baojiu Chen Cheng Wang Guozhong Ren

Thulium

10.1016/j.optmat.2006.06.003

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Citations (60)

[Upconversion and mid-infrared fluorescence properties of Ho3+/Yb3+ co-doped 50SiO2-50PbF2 glass ceramic].

PubMed (2014)

Xiaoguang Zhang Guozhong Ren Huai Wen Yang

In the present paper, the upconversion and mid-infrared fluorescence properties of Ho3+/Yb3+ co-doped 50SiO2- 50PbF2 glass ceramic (GC) were studied. The GC has the following composition (in mol%): 50SiO2-50PbF2-1YbF3-0. 5HoF3. The mixtures of about 10 g were placed in a corundum crucible and melted at 1000 degrees C for 15 min in a SiC electric furnace in air and then poured on a brass plate. The GCs were obtained just by heat treatment at 450 degrees C. The X-ray diffraction pattern of the GC indicates that very small size crystals were precipitated in the precursor glass by heat treatment. The GCs have as high transmittance as glasses. The GCs have higher absorption cross section and narrower absorption peaks compared to the corresponding glasses, indicating that fluoride is doped with Ho ions. The Judd-Ofelt intensity parameters were determined from the absorption spectrum and Judd-Ofelt theory. The omega2 value is 0.17 x 10(-20) cm2 lower than that of fluoride glass ZBLA (2.28 x 10(-20) cm2), because of Ho3+ doping in PbF2 microcrystal. The intense green upconversion light was observed in Ho3+/Yb3+ co-doped 50SiO2-50PbF2 GCs excited by 980 nm laser diode. A main emission band centered around 540 nm (green), and three week emission bands centered around 420 nm(violet), 480 nm (blue), and 650 nm (red) which correspond to the Ho3+ : ((5)F4-->(5)I8) ((5)G-->(5)I8), ((8)K3--(5)I8) and ((5)F5-->(5)I8) transitions, respectively, were simultaneously observed in GCs. Compared with the glass sample, GCs have significantly intension in the green and blue upconversion fluorescence, and not significant change in the red upconversion fluorescence. Those changes are because that Ho ion in GCs locates in lower phonon energy environment than in glasses. Lower phonon energy can make the nonradiative relaxation rate reduce, which improves the green light upconversion efficiency, at the same time reduces the population of the intermediate energy level ((5)I7) of the red light radiation. The 2.9 microm mid-infrared light was observed in GC sample, but not in glass precursor excited by 980 nm laser diode.

Photon Upconversion

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Citations (2)

Tunable multicolor upconversion luminescence and paramagnetic property of the lanthanide doped fluorescent/magnetic bi-function NaYbF4 microtubes

Journal of Alloys and Compounds (2013)

Zhigao Yi Guozhong Ren Ling Rao Haibo Wang Hongrong Liu

Photon Upconversion

Hexagonal prism

10.1016/j.jallcom.2013.12.036

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Citations (21)

Probing the distribution of rare earth ions in glass-ceramics by the properties of Er3+ ion probes

Research Square (Research Square) (2024)

Zhuo Chen Wenzhe Cui Ju Yang Jiayu Tian Guozhong Ren

Abstract Glass and glass-ceramic samples with matrix of SiO₂-PbF₂ system were firstly prepared. The glass was transformed into glass-ceramics by heat treatment, and the effect of different heat treatment times in this process on the microenvironment of rare earth ions into the glass-ceramics was investigated. The proportion of Er³⁺ entering the glass-ceramics during heat treatment was calculated by using J-O theory combined with absorption spectroscopy using Er³⁺ as a probe. On the other hand, Er³⁺ was used as a probe to investigate and analyze the changes of the crystalline phase of the glass-ceramics by combining fluorescence spectra, absorption spectra, and XRD changes. The results show that the XRD patterns indicate that heat treatment of the precursor glass at the transition temperature produces rapid crystalline deposition of PbF₂, but most of the rare earth ions are still present in the glass phase. And with the gradual increase of the heat treatment time, the rare earth ions in the glass phase gradually enter into the fluoride nanocrystals, but this process is not synchronized with the crystallization process.

Glass-ceramic

10.21203/rs.3.rs-4509562/v1

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Spectroscopic properties of Er3+-doped and Er3+/Yb3+-codoped PbF2–MOx (M=Te, Ge, B) oxyfluoride glasses

Journal of Alloys and Compounds (2007)

Zhengang Shang Guozhong Ren Qibin Yang Changfu Xu Yunxin Liu

10.1016/j.jallcom.2007.06.012

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Citations (18)

High uniformity and monodispersity of sodium rare-earth fluoride nanocrystals: controllable synthesis, shape evolution and optical properties

CrystEngComm (2010)

Songjun Zeng Guozhong Ren Changfu Xu Qibin Yang

Highly uniform and monodispersed pure hexagonal phase NaReF4 (Re = Y, Pr–Nd, and Sm–Yb) nanocrystals with well-defined morphologies, including pills, rods, spheres, tubes, and plates, were systematically synthesized by a facile solution-based hydrothermal method using oleic acid as a stabilizing agent. Crystal phase, shape and size can be tuned readily by simply adjusting the molar ratio of F/Re and reaction temperature. Detailed experimental studies revealed that NaReF4 hosts strongly tend to form hexagonal phase nanocrystals with increasing rare earth ion radius. Based on the studies on crystal phase control and shape evolution of NaReF4 nanocrystals, the whole growth mechanism of nanocrystals can be concluded as a kinetic and thermodynamic growth process. Simultaneously, highly efficient up-conversion luminescence under 980 nm excitation was realized, such as eye-visible red, green, and blue up-conversion luminescence generated from NaYbF4 host doped with Er3+, Ho3+, and Tm3+, respectively. Due to their unique up-conversion luminescence, the highly uniform and monodispersed nanocrystals can be applied for biolabels, colour displays, light-emitting diodes, and solid-state lasers.

Crystal (programming language)

Hexagonal phase

Hydrothermal Synthesis

10.1039/c0ce00325e

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Citations (79)

Novel Eu3+-doped red-emitting phosphor Gd2Mo3O9 for white-light-emitting-diodes (WLEDs) application

Journal of Alloys and Compounds (2006)

Xiaoxia Zhao Xiao‐Jun Wang Baojiu Chen Qingyu Meng Weihua Di

Ultraviolet

10.1016/j.jallcom.2006.06.096

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Citations (122)

Thermoelectric Properties of Te-Doped Ba _0.32 Co ₄ Sb _{12− x} Te _x Prepared at HPHT

Chinese Physics Letters (2011)

Guozhong Ren Yang Liu Hongan Ma Taichao Su Le-Jing Lin

Polycrystalline skutterudites Ba0.32Co4Sb12−xTex (nominally x = 0.1–0.7) are synthesized by the high pressure and high temperature (HPHT) method. The influence of Te substitution on electrical transport properties are investigated in the temperature range of 300–710K. All the samples show n-type conduction. It is found that the presence of Te substantially decreases electrical resistivity without any detrimental effect on the Seebeck coefficients, which improves the power factor. Among all the samples, Ba0.32Co4Sb11.5Te0.5 shows the highest thermoelectric figure of merit of 0.76 at 710 K.

Figure of Merit

Atmospheric temperature range

10.1088/0256-307x/28/4/048401

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Citations (3)

[Quantum efficiency of the 5D0 level of Eu3+ at C2 site in cubic nanocrystalline Y2O3].

PubMed (2006)

Qingyu Meng Baojiu Chen Xu Wu Xiaojun Wang Yihua Xie

In the present the authors are trying to work out how the quantum efficiency depends on the nanocrystalline size. Cubic nanocrystalline Y2O3 : Eu3+ samples were prepared by chemical self-combustion. The bulk Y2O3 : Eu3+ was obtained by annealing the nanocrystalline at 1 000 degrees C for 2 h. The emission spectra, XRD and fluorescence decay showed that the emission intensities are increased and fluorescence decay becomes slow with an increase in particle diameter of the samples. Two routes were used to estimate the quantum efficiency of the 5D0 level of Eu3+ at C2 site. The quantum efficiencies of 5D0 level of Eu3+ at C2 site in the samples depend on the nanocrystalline sizes. Finally, a detailed discussion about these two approaches for estimating the quantum efficiencies was made.

Nanocrystalline material

Quantum Efficiency

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