Yunting Chu

Liaoning Normal University

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Jingchang Sun

Liaoning Normal University

Chengren Li

Energy Research Institute

Qianyun Zhao

Liaoning Normal University

Feng Zhao

Soochow University

Qingfeng Bian

State Ethnic Affairs Commission

Feng Zhao

Puer University

Bo-Shi Mu

Liaoning Normal University

Keqin Zhao

Shenyang Normal University

Suyuan Bai

Liaoning Normal University

Xiuyan Chen

Jilin University

Cooperative Institutions

Liaoning Normal University

Shenyang Normal University

Dalian University of Technology

Chinese Academy of Sciences

Chinese Academy of Agricultural Sciences

Soochow University

Jiangxi Science and Technology Normal University

Southwest Petroleum University

Harbin Veterinary Research Institute

Sun Yat-sen University

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Improvement of Luminescence Characteristics of ZnGa₂O₄:Tb³⁺ Nanophosphors by Ce³⁺ Codoping

European Journal of Inorganic Chemistry (2022)

Bo-Shi Mu Feng Zhao Yunting Chu Chengren Li Jingchang Sun

Abstract A series of ZnGa 2 O 4 :Tb 3+ ,Ce 3+ persistent luminescence nanophosphors were prepared by high temperature solid‐state reaction. The X‐ray diffraction (XRD) patterns of the representative samples are consistent with that of the ZnGa 2 O 4 standard card. Scanning electron microscope (SEM) images show that the particle size of phosphor is enlarged when the Tb 3+ ion is doped, however, it becomes smaller again after the Ce 3+ ion is codoped. For ZnGa 2 O 4 :Tb 3+ nanophosphors, there exist intense 492 and 551 nm blue/green emissions under 280 nm excitation, and the optimum Tb 3+ doping concentration is 1.7 mol% and the long afterglow time is about 140 min. The PL and long afterglow characteristics of ZnGa 2 O 4 :1.7Tb 3+ nanophosphor are significantly improved once the Ce 3+ ion is codoped. The PL intensity of ZnGa 2 O 4 :1.7Tb 3+ nanophosphor is enhanced by 1.5 times and the long afterglow time is extended to 210 min when Ce 3+ doping concentrations are 0.3 and 0.5 mol%, respectively. The internal mechanism of the long afterglow effect of ZnGa 2 O 4 :1.7Tb 3+ ,0.5Ce 3+ nanophosphor is discussed in detail with the help of measurement results of thermoluminescence spectra.

Radioluminescence

10.1002/ejic.202100976

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Research on the graphene oxide's dielectric constant at the microwave frequency of 9.231GHz

Xiuyan Chen Keqin Zhao Xiu Li Yunting Chu Tianyi Jiao

The dielectric constants of graphene oxide's at 9.231GHz have been studied by cavity perturbation methods. 5g/ml and 2.5g/ml two different concentration graphene oxides were prepared and instilled into glass capillaries with the diameter of 0.9mm and 0.5mm. Based on the Independently developed heating system and temperature display device, the dielectric constants with different depth of microwave cavity were measured at different temperature from 18° to 38°. It found that the graphene oxide's dielectric constants became lager when the depth increased in the cavity. In addition, it varied obviously when the diameters of the sample changed.

Microwave cavity

Resonant cavity

10.1117/12.2505322

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A Wide Tunable Nanophosphor NaYO₂:Er³⁺/Yb³⁺ by Modulating Power Density

physica status solidi (RRL) - Rapid Research Letters (2021)

Feng Zhao Qingfeng Bian Yunting Chu Yi Zhang Qianyun Zhao

To date, it is still a challenging topic to achieve a wide tunable emission from the same sample under the excitation of a single pump source. Herein, a new sort of nanophosphor NaYO 2 :Er 3+ /Yb 3+ is prepared and characterized. In particular, the wide tunable range crossing red–yellow–green–white regions can be realized only by modulating the power density of the 980 nm semiconductor laser. The mechanism of emitting white light is discussed, and two formulae for quantitatively defining the fluorescent material's tuning ability are also offered. At the same time, the nanophosphor on hand possesses a high degree of reversibility. The nanophosphor presents comprehensive application prospects in information security, anticounterfeiting, display, and other fields.

10.1002/pssr.202100517

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Photoluminescence characteristics of CaSrSiO4: Yb3+, Er3+, Ag phosphor and its application on optical temperature sensor

Applied Physics B (2022)

Feng Zhao Yunting Chu Qianyun Zhao Weiwei Zhang Jingchang Sun

Atmospheric temperature range

10.1007/s00340-021-07716-4

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Photoluminescence of green nanophosphors Sr₂MgSi₂O₇ doped with Tb³⁺ under 374-nm excitation*

Chinese Physics B (2021)

Bo-Shi Mu Yi Zhang Qingfeng Bian Chengren Li Zhichao Li

A series of Sr 2 MgSi 2 O 7 :Tb 3+ nanophosphors is prepared using a high-temperature solid-state reaction. The x-ray diffraction patterns show that the crystal structure of the sample is not significantly affected by Tb 3+ ions. However, the images of the scanning electron microscope illustrate that the average size of nanoparticles becomes larger with the increase of Tb 3+ concentration. Unlike earlier investigations on down-conversion emission of Tb 3+ ion excited by deep ultraviolet light, in this work, the photoluminescence characteristics of Sr 2 MgSi 2 O 7 nanophosphors doped with different Tb 3+ concentrations are analyzed under 374-nm excitations. The intense green emission at 545 nm is observed at an optimal doping concentration of 1.6 mol%. The main reason for the concentration quenching is due to the electric dipole–electric dipole interaction among Tb 3+ ions.

Crystal (programming language)

10.1088/1674-1056/abfbce

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Citations (4)