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2 μm mid-infrared optical spectra of Tm3+-doped germanium gallate glasses

Journal of Rare Earths 2009年第5期27卷 781-785页

作者： XIA Haiping LIN Qiongfei zhang Jianli zhang qinyuan Laboratory of Photo-electronic Materials Ningbo University Ningbo 315211 China Laboratory of Photo-electronic Materials Ningbo University Ningbo 315211 China Laboratory of Photo-electronic Materials Ningbo University Ningbo 315211 China Key Laboratory of Specially Functional Materials of Ministry of Education and Institute of Optical Communication Materials South China University of Technology Guangzhou 510641 China

Glasses with the composition of 65GeO212Ga2O3-10BaO-8Li2O-5La2O3(molar ratio) doped with 1.526 wt.%, 3.006 wt.%, 5.836 wt.%, 11.028 wt.%, and 15.678 wt.% Tm2O3, respectively, were fabricated by conventional melting method. According to the absorption spectra and the Judd-Ofelt theory, the J-O strength parameters (Ω2,Ω4, Ω6) were calculated, with which the radiative transition probabilities,branching ratios and radiative lifetimes were obtained. The infrared emission spectra (with 808 nm LD excitation) at～1.47 and～1.8 μm of various concentrations of Tm3+-doped glasses were studied. The emission intensity at～1.8 μm reached to the maximum when the Tm2O3-doping concentration was near to be～3.006 wt.% (1.0 mol.%), and then decreased as doping concentration increased further. The mechanism of the fluorescence intensity change was explained with the cross-relaxation effect and the concentration quenching effect of Tm3+. Meanwhile, according to McCumber theory, the absorption and emission cross-sections corresponding to the 3F4→3H6 transitions of Tm3+ at 1.8 μm was obtained. For Tm3+-doped germanate glasses, the maximum emission cross-section reached a value higher than that re-ported for fluorozircoaluminate glasses. It is expected to be a favorable candidate host for～2.0 μm mid-inflated laser because the glass shows favorable optical spectra.

关键词： Tm3+-doped germanium-gallate glasses spectral properties cross relaxation emission cross-section rare earths

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One ion to catch them all: Targeted high-precision Boltzmann thermometry over a wide temperature range with Gd^(3+)

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Light(Science & Applications) 2021年第12期10卷 2443-2454页

作者： Dechao Yu Huaiyong Li Dawei zhang qinyuan zhang Andries Meijerink Markus Suta Engineering Research Center of Optical Instrument and System The Ministry of EducationShanghai Key Laboratory of Modern Optical SystemsUniversity of Shanghai for Science and TechnologyShanghai 200093China Condensed Matter and Interfaces Debye Institute for Nanomaterials ScienceDepartment of ChemistryUtrecht UniversityPrincetonplein 13584 CC UtrechtThe Netherlands School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252059China State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication MaterialsSouth China University of TechnologyGuangzhou 510641China Inorganic Photoactive Materials Institute of Inorganic ChemistryHeinrich Heine University DüsseldorfUniversitätsstraße 140225 DüsseldorfGermany

Ratiometric luminescence thermometry with trivalent lanthanide ions and their 4f^(n) energy levels is an emerging technique for non-invasive remote temperature sensing with high spatial and temporal *** ratiometric luminescence thermometry often relies on thermal coupling between two closely lying energy levels governed by Boltzmann’s *** its simplicity,Boltzmann thermometry with two excited levels allows precise temperature sensing,but only within a limited temperature *** low temperatures slow down the nonradiative transitions required to generate a measurable population in the higher excitation level,temperatures that are too high favour equalized populations of the two excited levels,at the expense of low relative thermal *** this work,we extend the concept of Boltzmann thermometry to more than two excited levels and provide quantitative guidelines that link the choice of energy gaps between multiple excited states to the performance in different temperature *** this approach,it is possible to retain the high relative sensitivity and precision of the temperature measurement over a wide temperature range within the same *** demonstrate this concept using YAl_(3)(BO_(3))_(4)(YAB):Pr^(3+),Gd^(3+)with an excited 6 PJ crystal field and spin-orbit split levels of Gd^(3+)in the UV range to avoid a thermal black body background even at the highest *** phosphor is easily excitable with inexpensive and powerful blue LEDs at 450 ***-background luminescence thermometry is realized by using blue-to-UV energy transfer upconversion with the Pr^(3+)−Gd^(3+)couple upon excitation in the visible *** method allows us to cover a temperature window between 30 and 800 K.

关键词： excited excitation luminescence

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Enhancing upconversion of Nd3+ through Yb^(3+)-mediated energy cycling towards temperature sensing

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Journal of Rare Earths 2021年第12期39卷 1506-1511,I0002页

作者： Nan Song Songbin Liu Peng zhang Junshan He qinyuan zhang Feng Wang Bo Zhou State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesSouth China University of TechnologyGuangzhou 510641China Department of Materials Science and Engineering City University of Hong KongHong Kong SARChina

Photon upconversion of lanthanides has been a powerful means to convert low-energy photons into high-energy ***,in contrast to the mostly investigated lanthanide ions,it has remained a challenge for the efficient upconversion of Nd^(3+)due to the deleterious concentration quenching *** we report an efficient strategy to enhance the upconversion of Nd^(3+)through the Yb^(3+)-mediated energy cycling in a core-shell-shell *** Nd^(3+)and Yb^(3+)are confined in the interlayer,and the presence of Yb^(3+)in the Nd-sublattice provides a more matched energy for the upconversion transitions occurring at the intermediate state of Nd^(3+)towards much better population at its emissive ***,this design also minimizes the possible cross-relaxation processes at both intermediate level and the emissive levels of Nd^(3+)which are the primary factors limiting the upconversion performance for the Nd^(3+)-doped *** energy cycling-enhanced upconversion shows promise in temperature sensing.

关键词： Upconversion Nd^(3+) Energy cycling Core-shell nanostructure Temperature sensing Rare earths

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Thermodynamic study on elimination of platinum inclusions in phosphate laser glasses for inertial confinement fusion applications

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Chinese Science Bulletin 1999年第7期44卷 664-668页

作者： qinyuan zhang Lili Hu Zhonghong Jiang Chinese Acad Sci Shanghai Inst Opt & Fine Mech Shanghai 201800 Peoples R China

A new method to calculate the formation enthalpies and free energies of compounds based on standard electromotive force of cation,φ0, and free energies of formation, ΔG2980, or formation enthalpies, ΔH2980, of chloride was proposed. A linear relationship between φ0 and ΔG2980, φ0 and ΔH2980, and ΔG2980 and ΔH2980 was found respectively. The parameters used for thermodynamic calculation were calculated. The calculated values of the formation enthalpies and the free energies of formation of platinum compounds, such as Pt3（PO4）2 and Pt （PO3）2,were given for the first time. The mechanism of eliminating platinum inclusions in phosphate laser glass by POCI3 gas bubbling was interpreted from thermodynamic aspect.

关键词： thermodynamics phosphate laser glass platinum inclusions.

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Structural Engineering of Eu^2+-Doped Silicates Phosphors for LED Applications

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Accounts of Materials Research 2020年第2期1卷 137-145页

作者： Ming Zhao qinyuan zhang Zhiguo Xia State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSchool of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510641China The Beijing Municipal Key Laboratory of New Energy Materials and Technologies School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

CONSPECTUS:Phosphor-converted light-emitting diodes(pc-LEDs)are of great importance for their applications in solid-state lighting,backlit display,and near-infrared detection light ***,the main challenges for these emergent pc-LEDs are to achieve full-spectrum lighting,wide color gamut display and broadband high efficiency near-infrared emission,respectively,which depends on the luminescence properties of phosphors *** to the unique 4f-5d transition,Eu^2+is one of the most commonly used activators in luminescent materials for pc-LEDs,and Eu^2+-doped earth-abundant silicates phosphors exhibit outstanding luminescence properties,including multicolor emission,adjustable bandwidth,excellent thermal stability as well as high luminescence *** attributes motivate scientists to find Eu^2+-doped silicates phosphors that can practically meet the various LED application *** the traditional trial and error exploration is time-consuming and not necessarily successful,it is necessary to find reliable structural engineering strategies to discover new phosphor systems and also realize purposeful photoluminescence *** adjustable 4f-5d electronic transitions of Eu^2+,the variable crystal structures of the silicate hosts and their coupling effect simultaneously account for the targeted luminescence behaviors and their precise emission color ***,we aim at developing Eu^2+-doped silicate phosphors that can solve the application challenges through a comprehensive understanding of Eu^2+photoluminescence mechanism and the structure−property *** this Account,we first illustrate the luminescence theory of Eu^2+in inorganic solids and summarize the research results of the effect originated from centroid shift,crystal field splitting,Stokes shift,and emission *** the basis of the factors dominating the variation of luminescence characteristics,several structural strategies to manipulate Eu^2+emission in silicates

关键词： luminescence consuming precise

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Understanding and tuning blue-to-near-infrared photon cutting by the Tm^(3+)/Yb^(3+) couple

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Light(Science & Applications) 2020年第1期9卷 992-1000页

作者： Dechao Yu Ting Yu Arnoldus Jvan Bunningen qinyuan zhang Andries Meijerink Freddy T.Rabouw Debye Institute for Nanomaterials Science Utrecht UniversityPrincetonplein 13584 CC UtrechtThe Netherlands State Key Laboratory of Luminescence Materials and Devices Institute of Optical Communication MaterialsSouth China University of TechnologyGuangzhou 510641China

Lanthanide-based photon-cutting phosphors absorb high-energy photons and‘cut’them into multiple smaller excitation *** quanta are subsequently emitted,resulting in photon-conversion efficiencies exceeding *** photon-cutting process relies on energy transfer between optically active lanthanide ions doped in the ***,it is not always easy to determine,let alone predict,which energy-transfer mechanisms are operative in a particular *** makes the identification and design of new promising photon-cutting phosphors *** we unravel the possibility of using the Tm^(3+)/Yb^(3+) lanthanide couple for photon *** compare the performance of this couple in four different host *** energy transfer from Tm^(3+)to Yb^(3+) would enable blue-to-near-infrared conversion with 200% ***,we identify phonon-assisted cross-relaxation as the dominant Tm^(3+)-to-Yb^(3+) energy-transfer mechanism in YBO_(3),YAG,and Y_(2)O_(3).In NaYF_(4),in contrast,the low maximum phonon energy renders phonon-assisted cross-relaxation impossible,making the desired cooperative mechanism the dominant energy-transfer *** work demonstrates that previous claims of high photon-cutting efficiencies obtained with the Tm^(3+)/Yb^(3+) couple must be interpreted with ***,the Tm^(3+)/Yb^(3+) couple is potentially promising,but the host material-more specifically,its maximum phonon energy-has a critical effect on the energy-transfer mechanisms and thereby on the photon-cutting performance.

关键词： couple phonon lanthanide

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In situ instant generation of an ultrabroadband near-infrared emission center in bismuth-doped borosilicate glasses via a femtosecond laser

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Photonics Research 2019年第3期7卷 300-310页

作者： LIPING WANG JIANGKUN CAO YAO LU XIAOMAN LI SHANHUI XU qinyuan zhang ZHONGMIN YANG MINGYING PENG State Key Laboratory of Luminescent Materials and Devices Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques School of Materials Science and Engineering South China University of Technology Department of Orthopedics Zhujiang Hospital Southern Medical University School of Physics and Physical Engineering Shandong Provincial Key Laboratory of Laser Polarization and Information TechnologyQufu Normal University

Bismuth(Bi)-doped photonic materials, which exhibit broadband near-infrared(NIR) luminescence(1000–1600 nm), are evolving into interesting gain media. However, the traditional methods have shown their limitations in enhancing Bi NIR emission, especially in the microregion. Consequently, the typical NIR emission has seldom been achieved in Bi-doped waveguides, which highly restricts the application of Bi-activated ***, superbroadband Bi NIR emission is induced in situ instantly in the grating region by a femtosecond(fs)laser inside borosilicate glasses. A series of structural and spectroscopic characterizations are summoned to probe the generation mechanism. And we show how this novel NIR emission in the grating region can be enhanced significantly and erased reversibly. Furthermore, we successfully demonstrate Bi-activated optical *** results present new insights into Bi-doped materials and push the development of broadband waveguide amplification.

关键词： ultrabroadband near-infrared emission center bismuth-doped borosilicate glasses via a femtosecond laser

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Emerging ultra-narrow-band cyan-emitting phosphor for white LEDs with enhanced color rendition

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Light(Science & Applications) 2019年第1期8卷 869-877页

作者： Ming Zhao Hongxu Liao Maxim S.Molokeev Yayun Zhou qinyuan zhang Quanlin Liu Zhiguo Xia The Beijing Municipal Key Laboratory of New Energy Materials and Technologies School of Materials Sciences and EngineeringUniversity of Science and Technology Beijing100083 BeijingChina Laboratory of Crystal Physics Kirensky Institute of PhysicsFederal Research Center KSC SB RASKrasnoyarsk660036Russia Siberian Federal University Krasnoyarsk 660041Russia Department of Physics Far Eastern State Transport UniversityKhabarovsk 680021Russia State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of Technology510641 GuangzhouChina

Phosphor-converted white LEDs rely on combining a blue-emitting InGaN chip with yellow and red-emitting luminescent *** discovery of cyan-emitting(470-500 nm)phosphors is a challenge to compensate for the spectral gap and produce full-spectrum white ***_(0.5)K_(0.5)Li_(3)SiO_(4):Eu^(2+)(NKLSO:Eu^(2+))phosphor was developed with impressive properties,providing cyan emission at 486 nm with a narrow full width at half maximum(FWHM)of only 20.7 nm,and good thermal stability with an integrated emission loss of only 7% at 150℃.The ultra-narrow-band cyan emission results from the high-symmetry cation sites,leading to almost ideal cubic coordination for UCr_(4)C_(4)-type ***:Eu^(2+) phosphor allows the valley between the blue and yellow emission peaks in the white LED device to be filled,and the color-rendering index can be enhanced from 86 to 95.2,suggesting great applications in full-spectrum white LEDs.

关键词： white narrow yellow

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Multi-functional bismuth-doped bioglasses: combining bioactivity and photothermal response for bone tumor treatment and tissue repair

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Light(Science & Applications) 2018年第1期7卷 1001-1013页

作者： Liping Wang Nicholas J.Long Lihua Li Yao Lu Mei Li Jiangkun Cao Yu zhang qinyuan zhang Shanhui Xu Zhongmin Yang Chuanbin Mao Mingying Peng The State Key Laboratory of Luminescent Materials and Devices Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesGuangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSchool of Materials Science and EngineeringSouth China University of Technology510641 GuangzhouChina Department of Chemistry Imperial College LondonSouth KensingtonLondon SW72AZUK Guangdong Key Lab of Orthopedic Technology and Implant Materials Department of OrthopedicsGuangzhou General Hospital of Guangzhou Military Command111 Liuhua Road510010 GuangzhouChina Department of Chemistry and Biochemistry Stephenson Life Sciences Research Center University of OklahomaNormanOK 73072USA School of Materials Science and Engineering South China University of TechnologyGuangzhou 510641China

Treatment of large bone defects derived from bone tumor surgery is typically performed in multiple separate operations,such as hyperthermia to extinguish residual malignant cells or implanting bioactive materials to initiate apatite remineralization for tissue repair;it is very challenging to combine these functions into a ***,we report the first photothermal(PT)effect in bismuth(Bi)-doped *** the basis of this discovery,we have developed a new type of Bi-doped bioactive glass that integrates both functions,thus reducing the number of treatment *** demonstrate that Bi-doped bioglasses(BGs)provide high PT efficiency,potentially facilitating photoinduced hyperthermia and bioactivity to allow bone tissue *** PT effect of Bi-doped BGs can be effectively controlled by managing radiative and non-radiative processes of the active Bi species by quenching photoluminescence(PL)or depolymerizing glass *** vitro studies demonstrate that such glasses are biocompatible to tumor and normal cells and that they can promote osteogenic cell proliferation,differentiation,and *** illumination with near-infrared(NIR)light,the bioglass(BG)can efficiently kill bone tumor cells,as demonstrated via in vitro and in vivo *** indicates excellent potential for the integration of multiple functions within the new materials,which will aid in the development and application of novel biomaterials.

关键词： glasses bismuth treatment

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Glass crystallization making red phosphor for high-power warm white lighting

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Light(Science & Applications) 2021年第4期10卷 570-581页

作者： Tao Hu Lixin Ning Yan Gao Jianwei Qiao Enhai Song Zitao Chen Yayun Zhou Jing Wang Maxim S.Molokeev Xiaoxing Ke Zhiguo Xia qinyuan zhang School of Physics and Optoelectronics State Key Laboratory of Lum inescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of TechnologyGuangzhouGuangdongChina Anhui Key Laboratory of Optoelearic Materials Science and Technology Key Laboratory of Functional Molecular SolidsMinistry of EducationAnhui Normal UniversityWuhuAnhuiChina School of Applied Physic and Materials Wuyi UniversityJiangmenGuangdongChina Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry State Key Laboratory of Optoelectronic Materials and TechnologiesKLGHEI of Environment and Energy ChemistrySchool of Chemistry and Chemical EngineeringSun Yat-sen UniversityGuangzhouGuangdongChina Laboratory of Crystal Physics Kirensky Institute of PhysicsFederal Research Center KSC SB RASKrasnoyarskRussia Siberian Federal University KrasnoyarskRussia Research and Developm ent Department Kemerovo State UniversityKemerovoRussia lnstitute of Microstructure and Property of Advanced Materials Beijing University of Technology BeijingBeijingChina

Rapid development of solid-state lighting technology requires new materials with highly efficient and stable luminescence,and especially relies on blue light pumped red phosphors for improved light ***,we discovered an unprecedented red-emitting Mg_(2)AI_(4)Si_(5)0_(18):Eu^(2+)composite phosphor(λex=450 nm,λem=620 nm)via the crystallization of MgO-AI_(2)O_(3)-Sio_(2) aluminosilicate *** experimental measurement and first-principles calculations verify that Eu^(2+)dopants insert at the vacant channel of Mg_(2)AI_(4)Si_(5)0_(18)crystal with six-fold coordination responsible for the peculiar red ***,the resulting phosphor exhibits high internal/external quantum efficiency of 94.5/70.6%,and stable emission against thermal quenching,which reaches industry *** maximum luminous flux and luminous efficiency of the constructed laser driven red emitting device reaches as high as 274 Im and 54lm W^(-1),*** combinations of extraordinary optical properties coupled with economically favorable and innovative preparation method indicate,that the Mg_(2)AI_(4)Si_(5)0_(18):Eu^(2+)composite phosphor will provide a significant step towards the development of high-power solid-state lighting.

关键词： power pumped lighting

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