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up-conversion luminescence polarization control in Er^(3+)-doped NaYF_4 nanocrystals

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Chinese Physics B 2016年第2期25卷 123-128页

作者：张晖姚云华张诗按卢晨晖孙真荣 Institute of Science Information Engineering University State Key Laboratory of Precision Spectroscopy and Department of Physics East China Normal University College of Mechanical Engineering Shanghai University of Engineering Science

We propose a femtosecond laser polarization modulation scheme to control the up-conversion（UC） luminescence in Er^（3＋）-doped NaYF_4 nanocrystals dispersed in the silicate glass. We show that the UC luminescence can be suppressed when the laser polarization is changed from linear through elliptical to circular, and the higher repetition rate will yield the lower control efficiency. We theoretically analyze the physical control mechanism of the UC luminescence polarization modulation by considering on- and near-resonant two-photon absorption, energy transfer up-conversion, and excited state absorption, and show that the polarization control mainly comes from the contribution of near-resonant two-photon absorption. Furthermore, we propose a method to improve the polarization control efficiency of UC luminescence in rare-earth ions by applying a two-color femtosecond laser field.

关键词： up-conversion luminescence laser polarization nanocrystal

up-conversion luminescence tuning in Er^3+ -doped ceramic glass by femtosecond laser pulse at different laser powers

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Chinese Physics B 2018年第12期27卷 224-230页

作者： Wen-Jing Cheng Guo Liang Ping Wu Shi-Hua Zhao Tian-Qing Jia Zhen-Rong Sun Sift-An Zhang School of Electronic &Electrical Engineering Shangqiu Normal UniversityShangqiu 476000China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China

The up-conversion luminescence tuning of rare-earth ions is an important research topic for understanding luminescence mechanisms and promoting related applications. In this paper, we experimentally study the up-conversion luminescence tuning of Er3+-doped ceramic glass excited by the unshaped, V-shaped and cosine-shaped femtosecond laser field with different laser powers. The results show that green and red up-conversion luminescence can be effectively tuned by varying the power or spectral phase of the femtosecond laser field. We further analyze the up-conversion luminescence tuning mechanism by considering different excitation processes, including single-photon absorption(SPA), two-photon absorption(TPA), excited state absorption(ESA), and energy transfer up-conversion(ETU). The relative weight of TPA in the whole excitation process can increase with the increase of the laser power, thereby enhancing the intensity ratio between green and red luminescence(I547/I656). However, the second ETU(ETU2) process can generate red luminescence and reduce the green and red luminescence intensity ratio I547/I656, while the third ESA(ESA3) process can produce green luminescence and enhance its control efficiency. Moreover, the up-conversion luminescence tuning mechanism is further validated by observing the up-conversion luminescence intensity, depending on the laser power and the down-conversion luminescence spectrum under the excitation of 400-nm femtosecond laser pulse. These studies can present a clear physical picture that enables us to understand the up-conversion luminescence tuning mechanism in rare-earth ions, and can also provide an opportunity to tune up-conversion luminescence to promote its related applications.

关键词： rare-earth ions up-conversion luminescence pulse shaping two-photon absorption

up-conversion luminescence properties and energy transfer of Er^(3+)/Yb^(3+)co-doped oxyfluoride glass ceramic containing CaF_2 nano-crystals

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Chinese Physics B 2014年第5期23卷 574-578页

作者：马辰硕焦清李龙基周大成杨正文宋志国邱建备 College of Materials Science and Engineering Kunming University of Science and Technology Key Laboratory of Advanced Materials of Yunnan Province

The Er^3＋/yb^3＋ co-doped transparent oxyfluoride glass-ceramics containing CaF2 nano-crystals were successfully prepared. After heat treatments, transmission electron microscopy （TEM） images showed that CaF2 nano-crystals of 20-30 nm in diameter precipitated uniformly in the glass matrix. luminescence of Er^3＋ at 540 nm and 658 nm was observed in Comparing with the host glass, high efficiency upconversion the glass ceramics under the excitation of 980 nm. Moreover, the size of the precipitated nano-crystals can be controlled by heat-treatment temperature and time. With the increase of the nano-crystal size, the intensity of the red emission increased more rapidly than that of the green emission. The energy transfer process of Er^3＋ and Yb^3＋ was convinced and the possible mechanism of Er^3＋ up-conversion was discussed.

关键词： nano-crystals up-conversion luminescence Er^3+/Yb^3+ co-doped glass ceramics

up-conversion luminescence research of Er（0.5）：ZBLAN material for volumetric display application when excited by 1520nm laser

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Chinese Physics B 2003年第12期12卷 1451-1458页

作者：陈晓波张福初陈鸾 AppliedOpticsBeijingAreaMajorLaboratory AnalyticandTestingCenterBeijingNormalUniversityBeijing100875China BeijingGlassResearchInstitute Beijing100062China

The up-conversion luminescence of the ZBLAN fluoride glass Er(0.5):ZBLAN, when excited by a 1520nm semiconductor laser, is studied in this paper. The absorption and common-fluorescence spectra are also measured in order to understand the up-conversion clearly. It is found that there are seven strong up-conversion luminescence lines (406.97m,410.42 nm), (521.97m, 527.56 nm), (542.38m, 549.27 nm), (654.27m, 665.70 nm), 801.57m nm, 819.46 nm, and 840.00 nm,which can be recognized as the fluorescence transitions of (2G4F2H)9/2 → 4I15/2, 2Hll/2 → 4I15/2, 4S3/2 → 4I15/2,4F9/2 → 4I15/2, 4I9/2 → 4I15/2, (2G4F2H)9/2 → 4I9/2, and 4S3/2 → 4I13/2 respectively. Meanwhile, the small upconversion fluorescence lines 379.20 nm, 453.10 nm and 490.60 nm are the transitions of 4G11/2 → 4I15/2, 4F5/2 → 4I15/2and 4F7/2 → 4I15/2 respectively. It is interesting that the slopes of log F-logP curves, the double-logarithmic variation of up-conversion luminescence intensity F with laser power P, are different from each other for these observed up-conversion luminescence, this being valuable for the volumetric display. Comprehensive discussions find that the 4G11/2 → 4I15/2, (2G4F2H)9/2 → 4I15/2, (2H11/2 → 4I15/2, 4S3/2 → 4I15/2, 4F9/2 → 4I15/2), and 4I9/2 → 4I15/2up-conversion luminescences are five-photon, four-photon, three-photon, and two-photon up-conversion luminescences respectively. It is found also that the absorption from ground-state 4I15/2 level to 4I13/2 level is very large, which is beneficial to the sequential energy transfer up-conversion to occur.

关键词： up-conversion luminescence Er(0.5):ZBLAN material volumetric display

Effects of Bi^(3+) on down-/up-conversion luminescence,temperature sensing and optical transition properties of Bi^(3+)/Er^(3+)co-doped YNbO_(4) phosphors

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Journal of Rare Earths 2022年第3期40卷 381-389,I0001页

作者： Xin Wang Xiangping Li Hongquan Yu Sai Xu Jiashi Sun Lihong Cheng Xizhen Zhang Jinsu Zhang Yongze Cao Baojiu Chen School of Science Dalian Maritime UniversityDalian 116026China

A series of YNbO_(4):Bi^(3+) and YNbO_(4):Bi^(3+)/Er^(3+) phosphors were prepared by a conventional high temperature solid-state reaction *** results of XRD and Rietveld refinement confirm that monoclinic phase YNbO_(4)samples are *** down-/up-conversion luminescence of Er^(3+) ions was investigated under the excitation of ultraviolet light(327 nm)and near infrared light(980 nm).Under 327 nm excitation,broad visible emission band from Bi^(3+) ions and characteristic green emission peaks from Er^(3+) ions are simultaneously observed,while only strong green emissions from Er^(3+) ions are detected upon excitation of 980 *** emission enhancement is observed in down-/up-conversion luminescence processes by introducing Bi^(3+) ions into Er^(3+)-doped YNbO_(4)*** current versus up-conversion emission intensity study shows that two-photon processes are responsible for both the green and the red up-conversion emissions of Er^(3+)*** the study of the temperature sensing property of Er^(3+) ion,it is affirmed that the temperature sensitivity is sensitive to the doping concentration of Bi^(3+) *** comparing the experimental values of the radiative transition rate ratio of the two green emission levels of Er^(3+) ions and the theoretical values calculated by Judd-Ofelt(J-O)theory,it is concluded that the temperature sensing property of Er^(3+) ions is greatly affected by the energy level splitting.

关键词： YNbO_(4):Bi^(3+)/Er^(3+) Down-conversion luminescence up-conversion luminescence Temperature sensing Rare earths

up-conversion luminescence of Er^(3+)and Yb^(3+)co-doped CaBi_(2)Ta_(2)O_(9) multifunctional ferroelectrics

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Journal of Advanced Dielectrics 2014年第3期4卷 12-17页

作者： Qiufeng Cao Dengfeng Peng Hua Zou Jun Li Xusheng Wang Xi Yao Functional Materials Research Laboratory Tongji University1239 Siping Road Shanghai 200092P.R.China

Er^(3+)and Yb^(3+)co-doped CaBi_(2)Ta_(2)O_(9)(CBT)-based bismuth layered-structure oxides were synthesized by a simple solid-state reaction *** up-conversion(UC)luminescence,dielectric and ferroelectric properties were *** strong green emission bands centered at 526 and 547nm and a weak red emission band centered at 658nm were obtained under a 980nm laser excitation at room *** emission bands originated from the radiative relaxation of Er^(3+)from 2H_(11)=2,4S_(3)=2,and 4F_(9/2) levels to the ground state 4I_(15)=2,*** the meantime,the fluorescence intensity ratio(FIR)variation of two green UC emissions at 526 and 547nm has been studied as a function of temperature in the range of 153–*** maximum sensor sensitivity obtained was 39×10^(-4)K^(-1) at 590K,which indicated that Er^(3+)=Yb^(3+)co-doped CBT ceramic is a promising candidate for applications in optical high temperature sensor.

关键词： Aurivillius-type bismuth layered-structure ferroelectrics up-conversion luminescence sensor fluorescence intensity ratio

Improvement up-conversion luminescence Properties of SrIn_2O_04:Er^(3+) by Doping Yb^(3+) as Sensitizer

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Journal of the Chinese Ceramic Society 2016年第2期 78-83页

作者： QI Shuai TIAN Yinghe LI Yong ZHANG Huan LI Xiang YOU Jianqi YUAN Xiaoxian WANG Zhijun LI Panlai LIU Haiyan College of Physics Science & Technology Hebei University Industrial & Commercial college Hebei University

A series of Yb^(3+)/Er^(3+) or Er^(3+) doped SrIn_2O_4 were synthesized by a high temperature solid state *** up-conversion luminescence property and the phase formation of SrIn_2O_4:Er^(3+) and SrIn_2O_4:Yb^(3+),Er^(3+) were investigated by X-ray diffraction(XRD) and spectral *** XRD pattern shows that incorporating different amounts of Yb^(3+)and Er^(3+) have no influence on the phase formation of SrIn_2O_*** up-conversion luminescence spectrum of SrIn_2O_4:Er^(3+) presented a weak luminescence due to ground state absorption of Er^(3+).However,Yb^(3+)/Er^(3+) codoped SrIn_2O_4 depicted the green(525 and 551 run) and red(662 nm) up-conversion luminescence which were assigned to the energy transfer from the Yb^(3+) transition ~2F_(7/2)-~2F_(5/2) to the Er^(3+) transitions ~2H_(11/2)-~4I_(15/2) and ~4F_(9/2-~4I_(15/2),*** possible up-conversion luminescence mechanism of SrIn_2O_4:Yb^(3+),Er^(3+) was *** results could be helpful to the development of up-conversion luminescence materials.

关键词： up-conversion luminescence SrIn2O4 Er Yb co-doped

Investigation of up-conversion luminescence of Er3+ and Er3+/Yb3+ ions doped in PLZT for active electro-optical applications

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Frontiers of Optoelectronics 2008年第Z1期1卷 142-146页

作者： Baozeng LI Anting WANG Hai GUO Xuesheng CHEN Hua JIANG Zhiqiang ZHENG Hai MING Department of Physics University of Science and Technology of China Department of Physics and Astronomy Wheaton College Boston Applied Technologies Inc. Department of Physics Fujian Normal University

The up-conversion luminescence of Er3+and Er3+/Yb3+ions doped in lanthanum-modified lead zirconate titanate（PLZT） under 980 nm excitation at room temperature has been *** green upconversion luminescence at 540 and 566 nm was observed in Er3+:PLZT;the greater the concentration of Er3+ions,the stronger the *** Er3+-Yb3+:PLZT,other than the green up-conversion luminescence at 540 and 566 nm,a relatively weak red up-conversion luminescence at 668 nm was also *** green and red up-conversion luminescence intensities presented an approximately quadratic dependence on excitation power,which indicated that two excitation photons are involved in the up-conversion process of Er3+:PLZT and Er3+-Yb3+:*** characteristics of PLZT ceramic material were also studied by Raman *** work shows a promising future for developing multifunctional up-conversion electrooptical devices using Er3+and Er3+/Yb3+ions doped PLZT.

关键词： up-conversion luminescence Er 3+ and Er 3+ /Yb 3+ doped lanthanum-modified lead zirconate titanate (PLZT)

Green up-conversion luminescence in Nd^(3+)-Ho^(3+) Co-doped Oxyfluorotellurite Glasses

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Journal of Wuhan University of Technology(Materials Science) 2007年第B12期22卷 809-812页

作者：邱建备 Key Lab.of Advanced Materials of Yunnan Province Kunming University of Science and Technology

Blue, green and red up-conversion luminescence at around 490, 545 and 650 nm, which result from the Ho^3＋5F3→5I8, （5F4,5S2）→3. 5I8 and 5F5→ 5I8 transitions, respectively, were observed in Nd3＋-Ho3. co-doped oxyfiuorotellurite glasses under 800 nm excitation. Among these up-conversion luminescence, the green emission was extremely strong and the blue and red emission intensities were very weak. Selectively strong green up-conversion luminescence of these glasses indicate a high possibility for realizing a green upconversion laser. up-conversion processes for the blue, green and red emissions are two-photon processes assisted by Nd3^＋→Ho^3＋ energy transfer. It is proposed that the up-conversion mechanism for the blue and green emissions is different from that for the red emission. The respective mechanisms are discussed.

关键词： up-conversion luminescence oxyfiuorotellurite glass blue and greene emission