SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Zhenggang Zou,Tingting Guo,Guoliang Gong,Fulin Lin,Yijian Sun,Jianhui Huang,Jinsheng Liao,Herui Wen
The partially and equivalent substitution of La + Mg → Sr + Al in SrAl 12 O 19 lattice is an effective strategy to provide trivalent sites, reduce the site occupation splitting of Al and stabilize the entire lattice. When excited by 397 nm, the Eu 3+ activated La, Mg:SrAl 12 O 19 (ASL) phosphor shows intense linear emission through the 5 D 0 → 7 F 4 transition at 707 nm when compared with SrAl 12 O 19 :Eu 3+ . Especially, the Eu, Mg co-doped Sr 1-x La x Mg x Al 12-x O 19 with certain amount of x = 1/3 exhibits the significant intense photoluminescence, which was demonstrated through a lattice evolutional model. Eu 2+ in the host with 1/3 ratio of (La, Mg) substitution shows broad blue emission and as short fluorescence lifetime as 248 ns. The temperature-depended fluorescence quenching behavior confirms the essence of strong electric-phonon coupling originated from distorted and polarized crystal field around Eu 2+ /Sr 2+ site. Basing on site regulation of SrAl 12 O 19 matrix, our study provides a reference for exploration on efficient rare earth ions activated luminescent laser or scintillation materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Ou Hai,Jian Li,Mengkang Pei,Qiang Ren,Xiulan Wu,Bin Qin,Xinnan Xiao,Xiaoli He,Tong Li,Yang Chen
Advanced fluorescence anti-counterfeiting technology has attracted the attention of researchers and encourages people to develop more materials with more colors and functions. Here, in order to achieve a full-band afterglow in the visible light region, we designed a composite CsPbI3-CsPbBr3/Sr2MgSi2O7:Eu2+,Dy3+@SiO2, which is composed of nanoscale all-inorganic cesium lead perovskite quantum dots (PQDs) and long-afterglow luminescent materials Sr2MgSi2O7:Eu2+,Dy3+ (SMS). SMS is used to store light energy, and PQDs are used to control afterglow emission colors; through their energy transfer, the afterglow colors can be adjusted in the visible region. SiO2 is used as the coating material to improve the temporary stability of the nanocomposite. The composite mixed with oleic acid (OA) can be used as a dye, which exhibits different emitting colors and afterglow colors under different excitation environments. This research provided an idea for using long-afterglow luminescent materials and PQDs in the field of fluorescence anti-counterfeiting by double anti-counterfeiting of fluorescence and afterglow.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
C. Wang,X.Z. Zheng,L. Yue,P.J. Xia,M. Xu,W.B. Dai
The exploration of stable/efficient phosphor for n -UV chip pumped white light-emitting diodes ( w LEDs) remains an arduous task. Herein, a novel series of color tunable Eu 2+ /Tb 3+ /Sm 3+ tridoped Sc-based cyclosilicate phosphors (KBaScSi 3 O 9 : Eu 2+ /Tb 3+ /Sm 3+ ) have successfully designed and obtained via facile solid-state reaction based on comprehensive consideration of rigidly structural network of host, weak electron-phonon coupling strength and spectral adjustability of codopants via energy transfer (ET). The crystallographic occupancies of Eu, Tb and Sm primary in Ba/K, Ba and Ba sites in the monoclinic host, respectively were determined on the basis of the Rietveld refinements and crystal chemistry rules. The photoluminescence (PL) properties were systematically investigated in conjunction with structural analyses, implying that the ‘warm’ white light with excellent thermal stability is stemmed from combination of optimized blue (Eu 2+ ), green (Tb 3+ ) and red (Sm 3+ ) emissions via Eu → Tb → Sm ET strategy. Interestingly, Tb ions play both roles of green light luminescent center and ET bridge to achieve cascade ET for connecting Eu/Sm ion pairs because of the adverse metal-metal charge transfer (MMCT) effect (Eu 2+ + Sm 3+ → Eu 3+ + Sm 2+ ). Furthermore, the phosphor-converted w LEDs (pc- w LEDs), by encapsulating the optimal KBS: 4 %Eu/4 %Tb/6 %Sm with commercial n -UV LED chip, show high thermal stability with satisfactory electroluminescence (EL) performances. These results indicate the KBS: Eu/Tb/Sm phosphors are potential candidates for application in high power n -UV pumped pc- w LEDs.
研究领域:
材料科学
·
发光材料
·
固态照明
·
无机化学
·
光电子学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2020
·
IF 2.904
Tao Cai,Songtao Guo,Yongzeng Li,Di Peng,Xiaofeng Zhao,Weizhe Wang,Yingzheng Liu
Mechanoluminescence is a newly developed technology for the optical sensing of stress or surface pressure. One unfortunate limiting factor in its application is the sensors’ low sensitivity to stress (usually in the MPa range). In this study, an ultra-sensitive mechanoluminescent sensor is created based on the phosphor SrAl 2 O 4 :Eu 2+ , Dy 3+ , that showed greatly enhanced sensitivity (by a hundred times) than that of conventional mechanoluminescent sensors. This sensor took the form of a ceramic coating that was prepared via air plasma spray and vacuum tempering retreatment. Pure SrAl 2 O 4 :Eu 2+ , Dy 3+ powder was used with no supporting matrix to eliminate the negative effects of the elastic mismatch on the sensitivity. The sensor could resolve stress variations on the order of kPa based on the calibration results. We also demonstrated interesting applications based on this sensor, such as tactile sensing and air-pressure sensing, which show great promise for wireless mechanical perception.
研究领域:
材料科学
·
传感器与传感技术
·
陶瓷工程
·
光学材料
·
机械感知
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Yi Wei,Junsong Gao,Gongcheng Xing,Guogang Li,Peipei Dang,Sisi Liang,Yu Shu Huang,Chun Che Lin,Ting-Shan Chan,Jun Lin
Cation-substitution-induced controllable luminescence tuning could efficiently optimize and improve the luminescence performances of novel phosphor materials for realizing high-quality lighting. As important members of the orthophosphate family, ABPO4 (A = alkali metal Li, Na, K, Rb, Cs; B = alkali earth metal Mg, Ca, Sr, Ba) offers an abundant cation lattice environment for rare earth ions. Herein, we successfully prepared a broad-band red-emitting CsMgPO4:Eu2+ phosphor with an emission peak at 628 nm (fwhm = 118 nm). A series of cation-substitution strategies are designed to adjust and enhance its luminescence performances. The corresponding mechanisms are also investigated and proposed reasonably. A charge-compensation strategy of [Eu2+-Si4+] → [Cs+-P5+] could dramatically enhance the quenching concentration from 0.04 to 0.30, which is attributed to the decrease of Eu3+. Two cation-substitution strategies of larger Ba2+ (Sr2+) ions for Mg2+ ions could achieve superior emission adjustment of Eu2+ ions from the red to blue (yellow) region due to local lattice distortion. Interestingly, a consecutive emission adjustment from the red to blue region by simply changing the annealed temperature is reported for the first time, and the possible emission tuning mechanism is revealed based on a local lattice-strain control. This study could serve as a guide in developing Eu2+-activated ABPO4 phosphors with improving luminescence performance and controllable luminescence adjustment based on charge compensation and lattice-strain control through various cation substitutions.
研究领域:
材料科学
·
发光材料
·
固态化学
·
光学材料
·
荧光粉工程
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Jinyuan Bai,Yang Liu,Yanjun Hou,Shuhong Wang
A new luminescent europium(III) bis-β-diketonate complex, Eu 2 (PBT) 3 (NO 3 ) 3 (PBT = 1,1-(pyridine-2,6-diyl)bis(4,4,4-trifluoro-1,3-dione), was incorporated into the poly(methylmethacrylate) (PMMA) matrix and formed nanofibers via electrospinning technology. The different characterization techniques were adopted to reveal the effect of Eu 2 (PBT) 3 (NO 3 ) 3 on the spatial structure and optical properties of the nano-composite fibers obtained. The doping enhances the thermal stability and filament-forming properties for a series of PMMA-supported composite nanofibers Eu/PMMA, and in particular, the doping concentrations of 11 wt% also showed more efficient luminescence properties. Furthermore, the Judd-Ofelt theory was applied in this study to explain the effect of the distribution of Eu 2 (PBT) 3 (NO 3 ) 3 and the mutual effect of the Eu 2 (PBT) 3 (NO 3 ) 3 coordination compound and surrounding fractions of PMMA.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Chenyang Li,Yaping You,Zesheng Pan,Zesen Gao,Yunluo Wang,Yan Yang,Minghui Wang,Lianjun Wang,Haijie Chen,Wan Jiang
White light-emitting diodes (WLEDs) play a crucial role in solid-state lighting technologies. Among the key factors contributing to their performance, the development of high-quality cyan phosphors is critical in achieving excellent color rendering index (CRI) and stable long-term operation. In this study, a cyan-emitting phosphor, NaBa 2 Al(P 2 O 7 ) 2 : x Eu 2+ ( x = 0.01-0.06), was explored. The material's structures, morphology, optical behavior, and thermal stability were analyzed. Rietveld refinement reveals that the phosphor exhibits high crystallinity and confirms the successful substitution of Eu 2+ ions into Ba 2+ sites within the crystal lattice. Upon excitation at 320 nm, the phosphor emits broad, asymmetric cyan light, with peak intensity occurring at an Eu 2+ concentration of 0.03 achieving internal quantum efficiency (IQE) of 68.9%. Energy transfer and Gaussian fitting analyses show that Eu 2+ ions occupy two distinct crystallographic sites, and concentration quenching is attributed to dipole-dipole interactions. The phosphor retains 77% of its intensity at 425 K, with an activation energy of 0.3173 eV, demonstrating high thermal stability and color consistency. When integrated with a red-emitting phosphor onto a 320 nm UV chip, a white light-emitting diode (WLED) is fabricated, exhibiting a correlated color temperature (CCT) of 5727 K and a color rendering index (CRI) of 95.6. These results highlight this phosphor for applications in advanced white light-emitting diode (WLED) technologies across diverse lighting systems.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER INTERNATIONAL
·
2016
·Vol. 65
·期 10
·1238-1244
·
IF 2.414
Saiqi Tian,Jiating Wen,Haojun Fan,Yi Chen,Jun Yan,Peikun Zhang
An amino-terminated long persistent luminescent phosphor (Amino-SrAl 2 O 4 :Eu 2+ ,Dy 3+ ) was prepared based on inorganic SrAl 2 O 4 :Eu 2+ ,Dy 3+ phosphor, chemically modified with 3-aminopropyltriethoxysilane (KH550). Fourier transform infrared and X-ray photoelectron spectral, thermogravimetric and scanning electron microscopic measurements confirmed the successful synthesis of Amino-SrAl 2 O 4 :Eu 2+ ,Dy 3+ . Then this amino-functionalized phosphor was introduced into polyurethane (PU) through urea linkages, and the effects of the chemical combination of Amino-SrAl 2 O 4 :Eu 2+ ,Dy 3+ and PU on the morphology, structure, storage stability, and mechanical, thermal and luminescent properties of the resultant long persistent luminescent polyurethane (LPLPU) were investigated. Compared with SrAl 2 O 4 :Eu 2+ ,Dy 3+ /PU composites prepared by physical blending, the LPLPU shows better mechanical properties and storage stability due to the good compatibility of Amino-SrAl 2 O 4 :Eu 2+ ,Dy 3+ with PU. More residues and higher initial decomposition temperature are observed because the interaction of the amino-phosphor and PU delays the degradation. Study of the luminescent effect reveals that the LPLPU shows more than 10 h afterglow after cessation of the excitation light, and the brightness of green light in darkness is basically the same as that of LPLPU and SrAl 2 O 4 :Eu 2+ ,Dy 3+ /PU. © 2016 Society of Chemical Industry
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Yu Chen,Zhiyu Yang,Jiance Jin,Jianwei Qiao,Yuzhen Wang,Maxim S. Molokeev,Hendrik C. Swart,Zhiguo Xia
Exploring oxide-based red-emitting phosphors is essential for improving the color rendering index (Ra) and reducing the correlated color temperature (CCT) of white-light-emitting diode (LED) lighting sources. Especially, it is challenging to design Eu2+ red emission in inorganic solids. Here, the Eu2+-activated oxide phosphor Sr2LaGaO5:Eu2+ was synthesized with red emission peaking at 618 nm under 450 nm excitation. The crystal structure and spectral analysis indicate that Eu2+ tends to occupy [Sr1/LaO8] polyhedrons with a smaller coordination number, resulting in a large crystal field splitting at the 5d level and realizing the broadband 4f–5d red emission. When Sr is substituted by Ba atoms, density functional theory calculations verify that Ba tends to enter [Sr2O10] with a large coordination number, further giving rise to the lattice distortion and a giant spectral redshift (618–800 nm). The white LED device fabricated by mixing red Sr1.8Ba0.2GaO5:Eu2+ and green Lu3Al5O12:Ce3+ phosphors exhibits a high color rendering index (Ra = 92.1) and a low color-dependent temperature (CCT = 4570 K). This study will give guidance for exploring new Eu2+ activated oxide-based red phosphors as well as achieving tunable emission through cations’ substitution.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 108
·期 12
·e70174
·
IF 3.8
Caixiang Gou,Wei Zeng,Wenxiao Chen,Mengdi Mei,Haoyang Wu,Shiye Qian,Jile Wang
A new cyan long-persistent luminescence phosphor, Ba 6 BO 3 Cl 9 : Eu 2+ , Er 3+ , was synthesized by high-temperature solid-state reaction. The thermoluminescence and afterglow properties of the phosphor were significantly improved by the co-doping of Er 3+ . The Ba 6 BO 3 Cl 9 : Eu 2+ , Er 3+ phosphor exhibited an emission peak in the range of 400–700 nm, centered at 472 nm under 355 nm excitation, which was attributed to the 4f 6 5d 1 -4f 7 transition of Eu 2+ . At the optimal doping concentration, the initial afterglow brightness of the Ba 6 BO 3 Cl 9 : 0.1% Eu 2+ , 0.1% Er 3+ sample reached 0.1 cd/m 2 , and the afterglow lasted for more than 1.3 h. In addition, the synthesized Ba 6 BO 3 Cl 9 : 0.1% Eu 2+ , 0.1% Er 3+ /polydimethylsiloxane composite elastomer exhibited a mechanoluminescent property.
研究领域:
材料科学
·
发光材料
·
固体光学性质
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 1
·715-720
·
IF 1.798
Yang Yanfang,Zhao Yang,Chen Jingjing,Mao Zhiyong,Li Guanghao,Xu Jiao,Wang Dajian,Fahlman Bradley D.
In this work, Eu 2+ doped CaAlSiN 3 red-emitting nitride phosphors were synthesized for the first time from less-expensive and air-stable entire oxides raw materials, CaCO 3 , SiO 2 , Al 2 O 3 , and Eu 2 O 3 , through a common carbothermal reduction and nitridation (CTRN) method. The synthetic reaction processes involving in this CTRN route and the phase components, photoluminescent properties for the resultant CaAlSiN 3 :Eu 2+ nitride phosphors were investigated in detail. The presented synthesis route using cost-effective entire oxides raw materials for preparation of CaAlSiN 3 :Eu 2+ nitride phosphors shows promising prospect in promoting the application of CaAlSiN 3 :Eu 2+ nitride phosphors in solid state lighting.
研究领域:
材料科学
·
固态化学
·
光学材料
·
荧光粉合成
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Yanting Zhu,Chenxia Li,Degang Deng,Hua Yu,Hao Li,Le Wang,Changyu Shen,Xufeng Jing,Shiqing Xu
A series of Eu 2+ /Cr 3+ co-doped BaAl 12 O 19 phosphor was synthesized by traditional high temperature solid stated method, and the temperature-sensitive characteristic of the phosphor was researched. Due to the temperature sensitivity of the fluorescence lifetime of Cr 3+ , the thermometry based on fluorescence lifetime can be realized. Furthermore, the emissions of Eu 2+ ion and Cr 3+ ion can be well separated, which shows the excellent signal recognition ability of this phosphor. The Eu 2+ /Cr 3+ co-doped BaAl 12 O 19 phosphor can be used for the thermometry based on fluorescence intensity ratio. A dual-mode optical thermometry is proposed and researched in the temperature range of 293–563 K by using the decay lifetime of Cr 3+ emission and in the temperature range of 295–476 K by using the fluorescence intensity ratio of Eu 2+ to Cr 3+ as temperature readout. The maximum values of relative sensitivity are 0.466% K −1 at 363 K and 0.259% K −1 at 476 K. The Eu 2+ /Cr 3+ co-doped BaAl 12 O 19 phosphor has excellent optical temperature characteristic , and its dual-mode thermometry characteristics provide convenience for the application of this material. This phosphor has potential application prospects in the field of optical thermometry.
研究领域:
材料科学
·
光学工程
·
无机化学
·
传感器技术
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）