JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 105
·期 2
·500-510
·
IF 2.606
Huang Anding,Wu Yikun,Pan Zixin,Wang Bangyu,Liang Xiaoping
In order to improve the water resistance of SrAl 2 O 4 :Eu 2+ , Dy 3+ , the composite long afterglow material Sr 2 MgSi 2 O 7 :Eu 2+ , Dy 3+ @ SrAl 2 O 4 :Eu 2+ , Dy 3+ was prepared by covering uniform and stable Sr 2 MgSi 2 O 7 sol on SrAl 2 O 4 :Eu 2+ , Dy 3+ powder, which was synthesized via traditional solid-state method. The effects of various factors, such as the amount of ammonia, the molar ratio of Sr 2 MgSi 2 O 7 :SrAl 2 O 4 and the content of H 3 BO 3 , on the structure and luminescent properties of Sr 2 MgSi 2 O 7 :Eu 2+ , Dy 3+ @ SrAl 2 O 4 :Eu 2+ , Dy 3+ were investigated by the response surface method. The results show that the influence extent on both the initial afterglow brightness and water resistance are as follows:the amount of ammonia> the content of H 3 BO 3 > the molar ratio of Sr 2 MgSi 2 O 7 :SrAl 2 O 4 . When the amount of ammonia, the molar ratio of Sr 2 MgSi 2 O 7 :SrAl 2 O 4 and the content of H 3 BO 3 is 1.64 mL, 11.10, and 0.006 mol, respectively, both the brightness and water resistance of Sr 2 MgSi 2 O 7 :Eu 2+ , Dy 3+ @ SrAl 2 O 4 :Eu 2+ , Dy 3+ are improved, the water resistance is 0.835 (51.82% higher than that of pure SrAl 2 O 4 ) and the initial afterglow brightness can reach 2793 mcd/m 2 (91.69% higher than that of pure SrAl 2 O 4 ), which were in good agreement with the predicted optimum value of 0.867 and 2720 mcd/m 2 , respectively. Under the optimization conditions, the synergistic action of SrAl 2 O 4 with excellent afterglow properties and Sr 2 MgSi 2 O 7 with high water resistance plays an important role in improving the water resistance without sacrificing brightness. Finally, the water-based light-emitting inks with SMSA as fluorescent pigment exhibit excellent luminescent properties in the dark.
Graphical abstract
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Materials Au
·
2022
·
IF 0
Shunqi Lai,Ming Zhao,Yifei Zhao,Maxim S. Molokeev,Zhiguo Xia
Regulation of Eu2+ dopants in different cation sites of solid-state materials is of great significance for designing multicolor phosphors for light-emitting diodes (LEDs). Herein, we report the selective occupation of Eu2+ for multiple cationic sites in KSrScSi2O7, and the tunable photoluminescence from blue to cyan is realized through Eu2+ doping concentration-dependent crystal-site engineering. Eu2+ preferably occupies the K and Sr sites in KSrScSi2O7 at a low doping concentration, resulting in a 440 nm blue emission. As the Eu2+ concentration increases, a new Eu2+ substitution pathway is triggered, that is, Eu2+ enters the Sc site, leading to the red-shifted emission spectra from 440 to 485 nm. The doping mechanism and photoluminescence properties are corroborated by structural analysis, optical spectroscopy study, and density functional theory calculations. The optical properties of the as-fabricated white LEDs are studied, which demonstrates that these phosphors can be applied to full-spectrum phosphor-converted LEDs. This study provides a new design strategy to guide the development of multicolor Eu2+-doped oxide phosphors for lighting applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Dan Zhao,Shi-Rui Zhang,Yan-Ping Fan,Bao-Zhong Liu,Rui-Juan Zhang
The relationship between the structure and properties is always a hot topic in the luminescent material field. In this work, a new phosphor KBa2(PO3)5:Eu2+ (KBP:Eu) was prepared by a high-temperature solid-state reaction method and characterized by X-ray diffraction, energy-dispersive X-ray spectroscopy, photoluminescence (PL), and electroluminescence studies. The polyphosphate host KBP offers three lattice environments (K1, Ba1, and Ba2) for Eu2+ ions to realize broad-band emission from 380 to 700 nm under 345 nm excitation. The distributions of Eu2+ in the three lattice sites can be proven by low-temperature PL and transient fluorescence spectroscopy. Furthermore, temperature-dependent luminescence studies for phosphor KBP:0.02Eu reveal that its luminescence intensity at 150 °C retains about 97% of the initial value at 25 °C. By composing a 365 nm UV chip and KBP:0.02Eu, CaAlSiN3:Eu2+ phosphors, a warm white-light-emitting diode (WLED) was obtained with a correlated color temperature of 5146 K and chromaticity coordinates (0.3404, 0.3384). Therefore, KBP:Eu phosphor is a potential cyan-emitting phosphor used for high-power WLEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS
·
2024
·
IF 2
Xuan Gu,Zheng He,Xao-Yu Sun
Eu 2+ -doped Sr 2 LaGaO 5 phosphors were prepared using a high-temperature solid-state route in a furnace at 1450 °C. Their phase, microstructure, and luminescent performance were thoroughly investigated. The XRD measurements indicate that the prepared phosphors exhibit a tetragonal phase. Upon excitation at 450 nm, the Sr 2 LaGaO 5 :Eu 2+ phosphors demonstrate a broad red emission ranging from 475 to 850 nm, with a peak at 620 nm. At a doping concentration of 6 %mol Eu 2+ , the phosphors exhibit the highest emission intensity, characterized by CIE coordinates of (0.536, 0.453) and a color purity of 65.53 %. The temperature-dependent emission analysis reveals that the phosphors possess excellent thermal stability. The emission intensity of the Sr 2 LaGaO 5 :0.06Eu 2+ phosphor at 420 K is about 53.9 % of the initial intensity measured at 300 K, with a thermal activation energy of 0.393 eV. The pc-WLED device was constructed via the combination of an LED chip, yellow Y 3 Al 5 O 12 :Ce 3+ and the prepared Sr 2 LaGaO 5 :Eu 2+ phosphors, resulting in the emission of warm white light with a CCT value of 4985 K.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2021
·Vol. 9
·期 19
·2100337
·
IF 9.926
Dan Zhang,Xiangting Zhang,Baofeng Zheng,Qi Sun,Zhibo Zheng,Zhan Shi,Yanhua Song,Haifeng Zou
A series of Eu 2+ single doped Ca 9 Na 1– x Li x Sc 0.667 (PO 4 ) 7 phosphors with full-spectrum emission have been synthesized. Under the 385 nm excitation, the Eu 2+ single doped Ca 9 NaSc 0.667 (PO 4 ) 7 without Li + doping displays a broad cold white light emission with the peaks at about 480 and 610 nm. With the introduction of Li + ions, the Eu 2+ ions selectively occupy the Ca1, Ca2/Ca3, and Na sites. The variation of local environment of Eu 2+ ions caused by Li + ions enhances the luminous intensity, solves the problem of the lack of a red light component, and realizes the emission color tuning from cold white via warm white to orange. A special charge compensation method caused by Li + migration avoids the generation of defects and is beneficial to the improvement of luminescence properties. Eventually, a warm white light-emitting diode device is prepared by combining the white emitting Ca 9 Na 0.8 Li 0.2 Sc 0.667 (PO 4 ) 7 :2%Eu 2+ phosphors with 385 nm LED chip, which exhibits a high color-rendering of 92.9, low correlated color temperatures of 4529 K, and excellent color stability under working temperature. The as-reported warm white emitting Eu 2+ -doped phosphors have potential applications in full-spectrum solid-state lighting. The site engineering strategy provides an extensive guide for optimizing and designing novel single-composition white-emitting phosphor materials.
研究领域:
材料科学
·
光学工程
·
固态照明
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 49
·2305359
·
IF 19
Ke Su,Lefu Mei,Qingfeng Guo,Pengfei Shuai,Yujia Wang,Yukun Liu,Yang Jin,Zhijian Peng,Bo Zou,Libing Liao
Optical manometry is a highly promising method for measuring pressure. However, its wider application is limited by the lower sensitivity and influenced by environmental factors. Herein, multi-mode optical pressure sensors based on Eu 2+ -doped Li 4 SrCa(SiO 4 ) 2 phosphors suitable for a variety of complex pressure-measuring environments are designed. The phosphors contain two separate luminescence centers at 443 nm (Eu Sr ) and 584 nm (Eu Ca ), respectively. In the lower pressure range, the emission peak undergoes a massive redshift of 5.19 nm GPa −1 of Eu Ca , which is 14× better than commercially available ruby sensors. In order to improve the pressure response range and the accuracy of pressure measurement, for the first time, a new approach in the pressure readout method in which single Eu 2+ ions doping based on fluorescence intensity ratio (FIR) pressure measurement is realized in designed materials. Meanwhile, the measured full width at half maximum (FWHM) as an indicator of pressure sensor performance also reveals that the sensing performance is d FWHM /d P ≈ 1.23 nm GPa −1 and d FWHM /d P ≈ 0.84 nm GPa −1 for Eu Sr and Eu Ca positions, respectively. Additionally, the structural stability of the phosphor is confirmed by in situ Raman spectrum. The above results indicate that the Li 4 SrCa(SiO 4 ) 2 :0.04Eu 2+ phosphor is a good candidate for multi-mode optical pressure sensors.
研究领域:
光学传感
·
材料科学
·
压力测量
·
发光材料
·
固态物理
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
DeCai Huang,YouFu Zhou,WenTao Xu,Kun Wang,Zhuguang Liu,MaoChun Hong
Non-rare-earth-metal Mn 2+ and Eu 2+ co-doped BaSi 3 O 4 N 2 phosphors were synthesized by solid state reaction method. The effect of Mn 2+ concentration upon photoluminescence behavior was investigated systematically. The specimens were efficiently excited from UV to visible region. The green emission of Eu 2+ was greatly enhanced by Mn 2+ due to the co-excitation and energy transfer between Mn 2+ and Eu 2+ . The energy transfer probability from Mn 2+ to Eu 2+ depends strongly on the concentration of Mn 2+ with the maximum at 6 mol%. Furthermore, corresponding quantum efficiency and thermal stability were dramatically improved. Through the assembly of as-prepared green phosphor, YAG:Ce 3+ and Sr 2 Si 5 N 8 :Eu 2+ phosphors with 460 nm InGaN chip, a broad range of white light was obtained bearing with color temperature of 3585–3650 K and color-rendering index of 95–98, exhibiting an attractive candidate for the application in phosphor converted light-emitting diodes (pc-LEDs).
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 3
·2235-2243
·
IF 3.094
Xiuxia Yang,Lei Zhao,Wei Zeng,Zhichao Liu,Xiaotong Fan,Shuyu Tian,Hao Zhang,Xuhui Xu,Jianbei Qiu,Xue Yu
Fluorescent anti-counterfeiting technologies have become indispensable by virtue of their high concealment properties. In this work, the observation of the characteristic emission originated from Eu 2+ and Eu 3+ ions in CaYAl 3 O 7 realizes a dual-mode anti-counterfeiting strategy. The host matrix provides an environment, where blue and red emission could be manipulated with the introduction of Nd 3+ ions for the reduced occupation of Eu 3+ in the sites of Y 3+ ions. Moreover, the photoluminescence spectra of these samples exhibit time and temperature-dependent dynamic changes thanks to the capture and release of carriers in the reconstructed traps induced by Nd 3+ ions. Herein, a multi-stimuli responsive dynamic and static anti-counterfeiting could be achieved in this work.
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
ECS Journal of Solid State Science and Technology
·
2013
·Vol. 2
·期 9
·R196
·
IF 0
Yi-Fei Wang,Lihong Liu,Rong-Jun Xie,Qing Huang
Eu2+ doped BaMgAl10O17:Eu2+ (BAM) phosphors suffer from serious instability, although they have been widely used in various lighting and display applications. In this paper, high thermally stable Si–N-codoped BAM phosphors have been prepared by the microwave assisted sintering method at a relatively low temperature of 1450°C, and they were synthesized at 1550°C by the conventional solid-state reaction method for comparison. The microwave assisted sintering could reduce the activation energy and thus enhance the diffusion rate, and greatly improve the substitution amount of Si–N pairs for Al–O ones in the BAM host lattice. The Si–N doping significantly increased both the photoluminescence and the thermal stability of the BAM phosphors under ultraviolet (UV) and vacuum ultraviolet (VUV) excitations, comparable to the samples prepared by the conventional solid state reaction method. The proposed method is expected to be potentially applicable to other phosphors with higher photoluminescence and stability.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
KEY ENGINEERING MATERIALS
·
2016
·
IF 0
Chao Quan,You Fu Zhou,D.C. Huang,Wen Tao Xu
SrAl2O4:Eu2+,Dy3+ long-lasting phosphors were incorporated AlN successfully by a conventional solid-state reaction in the reductive atmosphere. When a certain amount of AlN was doped, the specimen SrAl2O4-3xN2x: Eu2+, 0.01Dy3+ (x = 0.0-0.2) maintained the phase purity. Under the excitation at 398nm, an intense broadband emission centered at 514 nm, originating from the 4f65d1→4f7 transition of Eu2+, was observed. It is noteworthy that partial nitridation leads to an enhancement in the emission intensity up to 240%. The study of thermal stability shows that the intensity of SrAl2O3.55N0.3:Eu2+,0.01Dy3+ phosphor still remains 72% at 150 °C comparing with the initial, while only 62% for the un-doped phosphor. Taking enhanced photoluminescence (PL) property and good thermal stability into account, SrAl2O4-3xN2x:Eu2+, 0.01Dy3+ is a promising candidate for the phosphors used in alternating current (AC) LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Junwei Zhang,Hui Lin,Wenhui Lou,Ruijin Hong,Zhaoxia Han,Dawei Zhang
Photo-stimulated luminescence materials have shown significant potential in the field of information storage, but they still face critical challenges in the regulation of trap levels. Herein, Ba 0.75 Al 11 O 17.25 :Eu 2+ fluorescent ceramics with abundant deep traps (1.24 eV) were reported via selective Mn 2+ co-doping. This material exhibits a homogeneous and dense crystalline structure, and its narrow-band emission at 514 nm is attributed to the energy transfer of Eu-Mn. Thermoluminescence curves, X-ray photoelectron spectroscopy and electron paramagnetic resonance spectra confirm that the trap levels primarily arise from oxygen vacancies and Reidinger defects, and Mn 2+ doping suppresses the formation of shallow traps through charge compensation mechanism. Significantly, information writing and reading in the ceramic medium were achieve using 254 nm UV light and 980 nm NIR light or thermal stimulation. The excellent photo-stimulated luminescence properties and high read-write stability of Ba 0.75 Al 11 O 17.25 :Eu 2+ , Mn 2+ are expected to accelerate the development of the next generation of optical storage technology.
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 Chemistry Frontiers
·
2020
·Vol. 5
·期 1
·333-340
·
IF 6.788
Zhizhen Wang,Zhen Song,Quanlin Liu
Persistent luminescent materials are widely used as night-vision and marking materials in various important fields. Although significant achievements have been made in blue and green persistent luminescent (PersL) materials, the research and development of PersL materials in the warm-color region (550–660 nm) are relatively lacking. Only the orange PersL phosphor Y2O2S:Eu3+,Mg2+,Ti4+ (∼610 nm) and deep red PersL phosphor (Ca1−xSrx)S:Eu2+,Tm3+ (∼650 nm) fulfill the demands of commercial applications. However, sulfide phosphors have poor chemical stability and a relatively short persistent duration time. Herein, we report a series of orange PersL materials, (Sr1−xBax)3SiO5:Eu2+,Nb5+, which exhibit a strong PersL emission band at 550–670 nm and a super-long persistent time of more than 20 h at the 0.32 mcd m−2 threshold value after UV radiation. These new orange PersL materials are compared to the commercial warm-color sulfide PersL phosphor, Y2O2S:Eu,Mg,Ti, with regards to PersL time and brightness, and it is determined that they would have great potential applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）