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Preparation and upconversion luminescence modification of YbPO4:Er3+inverse opal heterostructure

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Journal of Rare Earths 2017年第12期35卷 1180-1185页

作者： Zhuangzhuang Chai zhengwen yang Anjun Huang Chengye Yu Jianbei Qiu Zhiguo Song College of Materials Science and Engineering Kunming University of Science and Technology

Photonic crystal heterostructures composed of YbPO4：Er^（3＋） inverse opal and polystyrene opal were prepared via a template-assisted process, which exhibited two photonic band gaps. The microstructure,phase and optical properties of photonic crystal heterostructures were investigated by x-ray diffraction,scanning electron microscopy, fluorescence spectroscopy, absorption spectroscopy, fluorescence lifetime,etc. The upconversion emission suppression caused by single photonic band gap from the following YbPO4：Er^（3＋） inverse opal or the upper opal was observed. The upconversion luminescence was strongly suppressed due to the two photonic band gap overlapping effect caused by the following YbPO4：Er^（3＋） inverse opal or the upper opal. The modified mechanisms of upconversion luminescence were discussed by the upconversion luminescence lifetime of YbPO4：Er^（3＋） photonic crystal heterostructures. The results demonstrated the modified upconversion luminescence is attributed to the photon trapping caused by Bragg reflection of photonic crystal heterostructures.

关键词： Photonic crystal Heterostructures Upconversion luminescence Modification

Reversible 3D optical data storage and information encryption in photo-modulated transparent glass medium

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Light(Science & Applications) 2021年第8期10卷 1485-1493页

作者： Zhen Hu Xiongjian Huang zhengwen yang Jianbei Qiu Zhiguo Song Junying Zhang Guoping Dong College of Materials Science and Engineering Kunming University of Science and Technology650093 KunmingChina. State Key Laboratory of Luminescent Materials and Devices School of Materials Science and EngineeringSouth China University of Technology510640 GuangzhouChina. School of Physics Beihang University100191 BeijingChina

Transparent glass has been identified as a vital medium for three-dimensional(3D)optical information storage and multi-level ***,it has remained a challenge for directly writing 3D patterning inside a transparent glass using semiconductor blue laser instead of high-cost femtosecond ***,we demonstrate that rare earth ions doped transparent glass can be used as 3D optical information storage and data encryption medium based on their reversible transmittance and photoluminescence *** color of tungsten phosphate glass doped with rare earth ions change reversibly from light yellow to blue upon alternating 473 nm laser illumination and temperature stimulation,resulting in the reversible luminescence *** information data could be repeatedly written and erased in arbitrary 3D space of transparent glass,not only showing the ability of the excellent reproducibility and storage capacity,but also opening opportunities in information *** present work expands the application fields of luminescent glass,and it is conducive to develop a novel 3D data storage and information encryption media.

关键词： encryption optical transparent

Color tunable and white light emitting via energy transfer in single-phase BiOCl:Er^(3+),Sm^(3+) phosphors for WLEDs

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Journal of Rare Earths 2018年第3期36卷 231-237页

作者： Xiangzhou Zhang Yongjin Li Rui Hu Zuyuan Xu Jianbei Qiu zhengwen yang Zhiguo Song School of Materials Science and Engineering Kunming University of Science and Technology School of Materials Science and Engineering Sun Yat-sen University

BiOCl crystal shows potential as efficient optical host due to its special layered structure. Here,the luminescence properties of the Er^3＋/Sm^3＋ co-doped BiOCl phosphors as single-phase phosphors were reported. Upon near ultraviolet excitation（NUV, 380 nm corresponding the ^4 I15/2→ ^4 G11/2 transition of Er^3＋ ions）, the phosphors exhibit the efficient characteristic emissions of Er^3＋ and Sm^3＋ ions simultaneously. The energy transfer（ET） from Er^3＋ to Sm^3＋ ions in the layered crystals has been validated by the variation of emission intensities and decay lifetimes respectively, which is ascribed to be a dipoledipole interaction. By virtue of the ET behavior and increasing Sm^3＋ ion concentration, the enhancing emission intensity of Sm^3＋ and the tunability of emission color from yellowish-green（0.318, 0.420） to white（0.343, 0.347） are realized. The results of our work indicate that the Er^3＋/Sm^3＋ co-doped BiOCI phosphor has a promising application serving as single component white emitting phosphors for NUV excited WLEDs.

关键词： BiOCl Er^3+ Sm^3+ Color tunable Photoluminescence Energy transfer

Intense single-band red upconversion emission in BiOCl:Er3+ layered semiconductor via co-doping Ho3+

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Journal of Rare Earths 2020年第6期38卷 577-583页

作者： Yuehong Peng Jincai Peng Jiajun Han Tianhui Wang Zhaoyi Yin Jianbei Qiu Qi W ang zhengwen yang Zhiguo Song School of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China School of Physics and Electronical Science Chuxiong Normal UniversityChuxiong 675000China Dean's Office Sichuan University of Arts and ScienceDazhou 635000China

Exploring a new tuning way to facilely realize single-band red emission in trivalent rare-earth ions(RE3+) doped upconversion(UC) materials is still *** this work,the intense single-band red emission is achieved by co-doping only Ho3+in the BiOCl:Er3+ under 1550 nm *** the BiOCl layered host,co-doping Ho3+can further enhance the red emission and simultaneously suppress the green emission of Er3+,and thus obviously improve the red-to-green(R/G) *** is found that Ho3+does not se rve as ene rgy trapping through the 5 I6 state as in traditional UC materials but acts as ET bridge(4 S3/2,2 H11/2(Er3+)→5 F4,5 S2(Ho3+)→4 F9/2(Er3+)).The tuning mechanism of Ho3+is discussed in detail and further confirms through a comparative *** research gives an unusual perspective to tune the UC behavior of Er3+through co-doping Ho3+,which might be inspiring for achievement of single-band red UC emission.

关键词： Single-band red emission BiOCl Er3+ Ho3+ Rare Earths

Recent progress on upconversion luminescence enhancement in rare-earth doped transparent glass-ceramics

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Journal of Rare Earths 2016年第4期34卷 341-367页

作者：邱建备焦清周大成杨正文 Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 China Key Laboratory of AdvancedMaterials of Yunnan Province Kunming 650093 China Laboratory of Infrared Materials and Devices Advanced Teehnology Research Institute Ningbo University Ningbo 315211 China

The upconversion（UC） of the rare earth doped glass-ceramics has been extensively investigated due to their potential applications in many fields, such as color display, high density memories, optical data storage, sensor and energy solar cell, etc. Many series of them, especially the oxyfluorides glasses containing Ba2 LaF 7 nanocrystals were studied in this review work, due to the thermal and mechanical toughness, high optical transmittance from the ultraviolet to the infrared regions, and a low nonlinear refractive index compared to the other commercial laser glasses. Moreover, the energy transfer（ET） between the rare earth ions and transition metals plays an important role in the upconversion process. The cooperative ET has been researched very activly in UC glasses due to applications in the fields of solar cells, such as in the Er/Yb, Tm/Yb, Tb/Yb, Tb/Er/Yb and Tm/Er/Yb couples. The present article reviews on the recent progress made on：（i） upconversion materials with fluoride microcrystals in glasses and the mechanisms involved, including the UC in double and tri-dopant RE ions activated fluoride microcrystal, energy transfer process; and（ii） the effect of the metal Mn and nanoparticles of Au, Ag, Cu on the enhancement of UC emissions. Discussions have also been made on materials, material synthesis, the structural and emission properties of glass-ceramics. Additionally, the conversion efficiency is still a challenge for the spectra conversion materials and application; challenge and future advances have also been demonstrated.

关键词： upconversion glass ceramics fluoride rare earth energy transfer metal ions

Vocational Training:A Key to Unlock the Job Market

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China Today 2009年第7期58卷 40-43页

作者： MAN KAIYAN QI JIELUN yang zhengwen The authors are staff reporters of Financial Digest

THE world economic crisis is heightening the tension of young job-seekers in China, with neither migrant workers nor college graduates spared its devastating impacts. Many experts believe widespread lay-offs and joble... 详细信息

关键词：职业培训就业市场钥匙世界经济危机高校毕业生求职者破坏性说服力

Reversible upconversion luminescence modification and optical information storage application in the PbWO4:Yb3+,Er3+ photochromic ceramic

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Reversible upconversion luminescence modification and optica...

Investigation on morphology and broadband blue-white emission modification of La_(1–x)Bi_xOCl polycrystals

第二届全国光电材料与器件学术研讨会

作者： Xue Bai zhengwen yang Jianbei Qiu College of Materials Science and Engineering Kunming University of Science and Technology

Inorganic photochromic material is an available medium to obtain optical information *** luminescence modification based on photochromism is an effective measure to expand the storage capacity and ***,the photochromic PbWO:Yb,Erceramic was designed with a help of valence states change of W and Pb *** the 532 nm laser stimulation,the photochromism of PbWO:Yb,Erceramic was obtained based on Pb→Pband W→W,resulting in the optical information *** the stimulation of 808 nm laser,the written optical information was erased based on W→Wand Pb>*** addition,the photochromism caused upconversion emission modification was obtained in the PbWO:Yb,Er ceramic,realizing the effective and nondestructive reading out of optical *** cyclic experiment demonstrated a good reproducibility of both photochromism and upconversion emission modification,exhibiting the potential application of PbWO:Yb,Erceramic as the optical data storage medium.

关键词： PbWO4:Yb3+,Er3+ ceramic upconversion photochromism modification

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Journal of Rare Earths 2017年第1期35卷 53-57页

作者： HU Rui ZHOU Yuting SONG Zhiguo LI Yongjin LIU Qun XU Zuyuan KUANG Qingliang ZHANG Qingfu QIU Jianbei yang zhengwen School of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 China Department of Science Research Yunnan Technology and Business University Kunming 651700 China

Tetragonal structure La1-xBixOCl polycrystals were prepared by solid state synthesis. With increase in bismuth content, the morphology of the prepared samples changed from non-oriented particles to layered crystals and the broadband blue-white emission from LaOCl polycrystals decreased dramatically. Comparative experiments and X-ray photoelectron spectroscopy（XPS） analysis indicated that the host emission more possibly originated from Cl self-doping in oxychloride crystals. According to a close composition relationship of the Cl self-doping behavior and crystal morphology, it was suggested that the La composition strengthened the interlayer interaction between Cl^– anion and crystal cell lamellar, hindering the orientation of LaOCl crystals. The results of our work would deepen the understanding of the orientation structure of tetragonal oxyhalides and offer an insight into the origin of its host luminescence.

关键词： La1–xBixOCl host luminescence self-doping layered structure rare earths

Color tunable upconversion emission in CeO_2:Yb,Er three-dimensional ordered macroporous materials

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Journal of Rare Earths 2015年第6期33卷 599-603页

作者：程彦敏杨正文廖佳燕邱建备宋志国杨勇 College of Materials Science and Engineering Kunming University of Science and Technology

The three-dimensional ordered macroporous CeO2：Yb,Er materials were prepared, and the influence of doping concentra- tion of Yb3＋ or Er3＋ ions on upconversion property was investigated. Green and red upconversion emissions were observed under the excitation of 980 nm at room temperature. It was found that the ratio of red to green upconversion emission intensity increased with increasing of concentration of the Yb3＋ or Er3＋ ions in the three-dimensional ordered macroporous CeO2：Yb,Er materials. When the concentration of Yb3＋ was 10 mol%, pure red upconversion emission was obtained. The varied mechanism of ratio of red to green upconversion emission intensity was discussed with the concentration of Yb3＋ or Er3＋ ions.

关键词： three-dimensional ordered macroporous materials CeO2:Yb,Er upconversion emission color tunability rare earths