JOURNAL OF RARE EARTHS
·
2024
·Vol. 43
·期 3
·543-551
·
IF 5.2
Lang Ruan,Zeyun Zhou,Yi Hu,Ruifeng Peng,Xiaoyan Chen,Ming Cheng,Zhi Zhou,Mao Xia
The technology of solid-state lighting has developed for decades in various industries. Phosphor, as an element part, determines the application domain of lighting products. For instance, blue and red-emitting phosphors are required in the process of plant supplementing light, arrow-band emitting phosphors are applied to backlight displays, etc. In this work, a Bi 3+ -activated blue phosphor was obtained in a symmetrical and compact crystal structure of Gd3SbO7 (GSO). Then, the co-doping strategy of alkali metal ions (Li + , Na + , and K + ) was used to optimize the performance. The result shows that the photoluminescence intensity is increased by 2.1 times and 1.3 times respectively by introducing Li + and K + ions. Not only that, it also achieves narrow-band emitting with the full width of half-maximum (FWHM) reaching 42 nm through Na + doping, and its excitation peak position also shifts from 322 to 375 nm, which can be well excited by near-ultraviolet (NUV) light emitting diode (LED) chips (365 nm). Meanwhile, the electroluminescence spectrum of GSO:0.6 mol%Bi 3+ ,3 wt%Na + matches up to 93.39% of the blue part of the absorption spectrum of chlorophyll a . In summary, the Bi 3+ -activated blue phosphor reported in this work can synchronously meet the requirements of plant light replenishment and field emission displays .
研究领域:
材料科学
·
光学工程
·
固体照明
·
光电子学
·
农业光生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·Vol. 45
·期 5
·117112
·
IF 5.8
Yaqian Du,Jianbo Li,Jun Wang
Compared with perovskite SrTiO 3 , SrO(SrTiO 3 ) 2 exhibits lower thermal conductivity , while maintaining a high Seebeck coefficient , making it a promising material for photothermoelectric conversion. However, the relationship between its infrared and thermoelectric properties remains unexplored. This study examines the effect of Gd doping on these properties of SrO(SrTiO 3 ) 2 . Increased Gd doping induces a gradual transformation of SrO(SrTiO 3 ) 2 -based into a SrTiO 3 -based material, resulting in a composite comprising three phases and a notable reduction in thermal conductivity . At 973 K, the thermal conductivity decreases to a minimum of 1.4 W m −1 K −1 , which is 23 % lower than undoped SrO(SrTiO 3 ) 2 and 51 % lower than SrTiO 3 . Like SrTiO 3 , SrO(SrTiO 3 ) 2 absorbs infrared radiation in the 8–14 μm range. Although the highest ZT value reaches only 0.06 at 973 K, it shows a positive correlation with infrared emissivity. These findings are valuable for advancing the application of thermoelectric effects and the development of high-performance infrared materials.
研究领域:
材料科学
·
凝聚态物理
·
功能材料
·
能源材料
·
红外光学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2016
·
IF 2.183
Renping Cao,Xiangfeng Ceng,Jijun Huang,Hui Ao,Guotai Zheng,Xiaoguang Yu,Xinqin Zhang
A double perovskite Sr 2 ZnMoO 6 :Mn 4+ (SZM:Mn 4+ ) phosphor is synthesized by high-temperature solid-state reaction method in air. Emission band peaking at ∼705 nm of SZM:Mn 4+ phosphor in the range of 650–790 nm is attributed to the 2 E → 4 A 2 transition of Mn 4+ ion with activated different lattice vibration modes. Three excitation bands in the range of 210–610 nm are assigned to the O 2− → Mn 4+ charge transfer and the 4 A 2 → ( 4 T 1 , 2 T 2 , and 4 T 2 ) transition of Mn 4+ ion. The optimal Mn 4+ ion concentration is ∼0.8 mol% in SZM:Mn 4+ phosphor. Fluorescence lifetime of SZM:Mn 4+ phosphor decreases from ∼132 μs to 108 μs with increasing Mn 4+ ion concentration in the range of 0.2–1.0 mol%. Time-resolved spectra and fluorescence lifetime data indicate that luminescent center is caused by Mn 4+ ion. The luminous mechanism of SZM:Mn 4+ phosphor is explained by Tanabe-Sugano energy level diagram of Mn 4+ ion. The results are useful to understand the influences of the neighboring coordination environment around Mn 4+ and host crystal structure to the luminescence properties of Mn 4+ ion and develop other novel Mn 4+ -doped materials.
研究领域:
材料科学
·
无机化学
·
固体物理
·
发光材料
·
光电功能材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 13
·8145-8153
·
IF 4.036
Yulei Gao,Xiang Di,Fenfen Wang,Pingchuan Sun
Amorphous polymer-based room temperature phosphorescence (RTP) materials exhibiting tunable emission colors have received tremendous attention and are extremely challenging to prepare. Herein, polyacrylamide-based RTP materials with tunable multicolor emission were prepared via copolymerizing phosphor with concentration dependent luminescence colors and acrylamide with different molar ratios. The hydrogen bonding interactions and chemically crosslinked structures in these polymers effectively restrict the mobility of phosphors and activate efficient RTP emission. The molar ratio of phosphor and acrylamide has a significant influence on the photophysical properties of these polymers, which can be used to fabricate multicolor materials. In addition, the RTP intensity decreases with increasing humidity due to the disassociation of hydrogen bonding by adsorption of water, manifesting as a humidity sensor. Benefiting from the distinguishable RTP lifetimes and the responsiveness to humidity, triple encoding for information encryption is successfully realized.
研究领域:
高分子化学
·
分析化学
·
材料科学
·
传感器技术
·
信息安全
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Nan Zhou,Peixing Gao,Yimei Yang,Yuan Zhong,Mao Xia,Ye Zhang,Yun Tian,Xiangyang Lu,Zhi Zhou
In this paper, a series of novel orange-red emission phosphors Sr 8 ZnY(PO 4 ) 7 :Sm 3+ (SZYP:Sm 3+ ) were synthesized by high-temperature solid-state reaction. The photoluminescence and concentration-dependent properties of this phosphor were investigated carefully through diffuse reflection spectra, excitation and emission spectra, Commission Internationale de l'Éclairage (CIE) chromaticity coordinate and decay times. SZYP:Sm 3+ could be efficiently excited by n-UV and blue lights which center at 318, 345, 363, 376, 401, 410, 440 and 475 nm, respectively. The characteristic orange-red emission peaking at 563, 601 and 647 nm had been detected, which should be attributed to the characteristic f – f forbidden transition of Sm 3+ . The internal quantum efficiency (IQE) of ideal phosphor of SZYP:0.09Sm 3+ reached as high as 47%. In addition, The concentration quenching mechanism and thermal stability of SZYP:Sm 3+ were further investigated. It was found SZYP:Sm 3+ can maintain 93% of initial emission intensity at 150 °C and the corresponding activation energy was calculated to be 0.26 eV based on Arrhenius formula. The emission intensity of 1.0Mg 2+ and 0.02Al 3+ incorporated SZYP:0.09Sm 3+ reached up to 134% and 117% of the initial value, respectively. Moreover, (light-emitting diodes) LED devices were fabricated by employing the optimized samples as orange-red component with 365 nm n-UV chips. The desired emission in plant absorption region and extremely high thermal stability imply that SZYP:Sm 3+ is suitable for the application in plant growth LED lighting.
研究领域:
材料科学
·
光学工程
·
固体化学
·
光电子学
·
农业照明技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 76
·48238-48244
·
IF 3.108
Jiangyun Dai,Chao Yang,Hong Zhang,Hua Zhang,Guoying Feng,Shouhuan Zhou
The successful synthesis of rare earth doped nano/microcrystals with the desired morphology, uniform monodispersity, and intense infrared emission is of fundamental significance, and would facilitate their application in infrared emission-related miniaturization and integration in optoelectronics. However, simultaneously controlling the morphology and enhancing the infrared emission through simple and effective methods has not been well explored. In this study, via Ca2+ doping with an optimized concentration of 25 mol% in the hydrothermal solution, irregular NaGdF4:Yb/Er submicrocrystals converted into highly uniform submicrorods. Meanwhile, an obvious enhancement of visible upconversion (UC) and near-infrared (NIR) downconversion (DC) emission were obtained, probably due to the improved morphology and lowering the local crystal field symmetry around the rare earth ions induced by Ca2+ doping. Furthermore, Ce3+ ions with an optimized concentration of 2 mol% were codoped to intentionally tailor the branching ratio through efficient energy transfer from Er3+ to Ce3+. As a result, the ∼1530 nm emission intensity of the NaGdF4: 25Ca/2Ce/20Yb/2Er submicrorods increased by about 6.4 times in comparison with the NaGdF4:20Yb/2Er counterpart.
研究领域:
材料科学
·
光学工程
·
纳米技术
·
稀土化学
·
光电子学
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 11
·835
·
IF 2.5
Kou Chen,Duan Bin,Shi Lichun,Yang Hongcai,Ni Heng,Wang Haiyuan,Ye Qing,Hu Junshan,Hu Shigang
The Sc 3+ ions doped NaYF 4 : Yb 3+ , Er 3+ upconversion (UC) nanoparticles are synthesized by thermal decomposition method. We successfully obtained the upconversion luminescence (UCL) nanoparticles from green emission to red emission through doping Sc 3+ ions with different concentrations. Based on the XRD, the phase change process of Sc 3+ ions doped NaYF 4 nanocrystalline phase were demonstrated. More importantly, through the analysis of UC spectrum data, the change in the phase of the NaY/ScF 4 : Yb 3+ , Er 3+ nanocrystalline corresponds to the change in its luminous properties. It determines that the change of crystal field will lead to the change of luminescence, and then modulate the luminescence. NaScF 4 : Yb 3+ , Er 3+ UC nanoparticles exhibit strong red light emission. In addition, the temperature-sensitive properties of the optimal doping concentration of Sc 3+ ion were tested. The sensitivity of NaYF 4 : Yb 3+ , Er 3+ nanoparticles doped with Sc 3+ ion reached the maximum value of 0.024 K − 1 at 498 K. The nanocrystalline has great application value in the fields of optical temperature measurement, biomedicine, bioprobes and colorful display.
研究领域:
材料科学
·
光学工程
·
生物医学工程
·
纳米技术
·
分子影像学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 48
·期 3
·3875-3883
·
IF 4.527
Qingliang Shan,Qian Ma,Changrong Chen,Qiankun Xu,Yudong Xue,Hao Xiong,Yewei Wang,Yuqian Zhou,Anze Shui
In this study, the effect of microcrcaks strengthening on damage evolution of Al 2 TiO 5 (AT) flexible ceramics was investigated by acoustic emission (AE). Results reveal that with increasing content of ZrO 2 , the strength of AT flexible ceramics improves gradually and the strain increases at first then decreases. When the content of ZrO 2 is 12% and 8%, the strength and strain at maximum stress are increased by 154.92% and 38.27%, respectively. In addition, thanks to the “strengthening effect” of ZrTiO 4 on grain boundary microcracks, the damage development thresholds ( σ min and σ onset ), elastic modulus and fracture toughness of AT flexible ceramics modified with ZrO 2 are significantly improved. Moreover, the visible transverse cracks and matrix shedding in ATZ-0 are the most, but the cumulative AE damage events in ATZ-8 and ATZ-4 are more than ATZ-0 at late stage, for which the fracture of ZrTiO 4 glass phase and crack branching induced by ZrTiO 4 should be responsible.
研究领域:
材料科学
·
陶瓷学
·
固态物理
·
力学性能
·
结构表征
·
断裂力学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Jiajie Pan,Youjie Hua,Zhanhao Fan,Hongping Ma
Far-red light plays a crucial role in the field of plant lighting. Herein, a novel far-red phosphor BaAl 2 Si 3 O 4 N 4 : Sm 2+ , which can be effectively excited by blue light, was successfully prepared by high-temperature solid-state reaction. The PL spectrum show a broadband emission range from 600 nm to 950 nm (FWHM = 120 nm), which is well matched with the absorption of P FR in plant. In BaAl 2 Si 3 O 4 N 4 : Sm 2+ , the Ba 2+ are coordinated with three N and six O atoms. When the rare earth ion of Sm 2+ was doped into the host lattice , Ba 2+ was partially replaced by Sm 2+ . The low temperature PL spectra at 8–80 K were studied in detail. It was found that the PL spectra at low temperature were composed of some sharp lines and broadband superposition, which corresponding to the 5 D 0 - 7 F J (J = 0–4) energy level transition of Sm 2+ . It is shown that the broadband emission of the phosphor was caused by the broadening of the 4f 5 5 d 1 energy level due to the strong crystal field effect. The thermal stability analysis showed that the luminescence intensity of BaAl 2 Si 3 O 4 N 4 : Sm 2+ at 150 °C still maintains 62.7 % of that at room temperature , showing excellent thermal stability. All results indicate that BaAl 2 Si 3 O 4 N 4 : Sm 2+ phosphor has important potential applications in the field of plant lighting.
研究领域:
材料科学
·
光电子学
·
农业光学
·
无机化学
·
发光材料
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Zhenpeng Zhu,Zishan Sun,Ziying Guo,Xinguo Zhang,Zhan-chao Wu
A core-shell nanocomposite based on carbon dots (CD)/Rhodamine B (RhB) is realized by a facile method. The composite particles show spherical shape with narrow size distribution, non-agglomeration and smooth surface. The as-obtained nanocomposite shows the characteristic dual-emission of thermal-stable CD blue emission and thermal-sensitive RhB red emission at a single excitation wavelength. The fluorescence intensity ratio (FIR) is found to have a good linear relationship ( R 2 > 0.993) with temperature, while the corresponding maximum absolute and relative sensitivity is 2.01% K −1 and 1.39% K −1 in range of 283–373 K. The research provides a simple approach to create novel dual-emitting nanocomposites for temperature sensing application in micron-scale and biological field.
研究领域:
分析化学
·
纳米生物技术
·
生物医学工程
·
分子成像
·
生物传感
✓ 已验证
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2019
·
IF 2.6
S.J. Huang,Y.B. Xiao,J.L. Liu,Y. Ji,L.Y. Mao,W.C. Wang
In this work, a multicomponent GeO 2 –Sb 2 O 3 –BaO (BSG) glass is explored to assess its potential for 1.06 μm fiber lasers . The glass-forming region of BSG system is predicted and determined experimentally based on a thermodynamic method. Benefitting from the incorporation of Sb 2 O 3 , this system possesses an exceptionally large glass-forming region, as well as high density and refractive index , wide infrared transmission range and low phonon energy. Furthermore, an efficient near-infrared emission at 1064 nm from Nd 3+ has been realized in this oxide glass with relatively long measured lifetime (200.58 ± 1.24 μs) and large emission cross-section (3.015 ± 0.090 × 10 −20 cm 2 ), indicating that Nd 3+ -doped BSG glass is a promising candidate for laser application in 1.06 μm region.
研究领域:
光学材料
·
玻璃科学
·
激光物理
·
无机非金属材料
·
光子学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 50
·期 1
·1452-1460
·
IF 5.2
Shangwei Wang,Ran Pang,Xuexia Chen,Tao Tan,Qi Wang,Chengyu Li,Su Zhang,Taixing Tan,Hongpeng You,Hongjie Zhang
Near-infrared phosphor conversion light-emitting diode (NIR pc-LED) is a widely used ideal NIR light source due to its unique advantages of low cost, energy saving, compactness and long operational lifetime. However, there is currently a scarcity of appropriate phosphor for NIR light sources utilized in spectral detection, with emission peak larger than 850 nm and steady spectrum output of ultra broadband spectra. Here, a broadband Cr 3+ activated LiScSnO 4 (LSS) phosphor ( λ ex-max = 460 nm) matching the pump band of commercial blue LED chips has been developed, which shows a long wavelength NIR emission peaking at 900 nm. Cr 3+ simultaneously replace the Wyckoff site co-occupied by Sc and Sn in LSS. Due to the difference of local environment of the specific crystal field , two different wide emission bands are caused. These two broad emission bands both contribute to the broadband luminescence with a full width at half maximum (FWHM) of 227 nm. Benefiting from the crystallography consistent Wyckoff position occupation of Cr 3+ ions, the spectral distribution of LSS:Cr 3+ exhibit excellent stability over a wide temperature span (80–423 K). The broadband NIR pc-LED prototype based on LSS:Cr 3+ shows great potential in NIR spectrum detection, night vision imaging applications.
研究领域:
材料科学
·
光学工程
·
固态物理
·
光电子学
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）