CRYSTENGCOMM
·
2019
·Vol. 22
·期 2
·311-319
·
IF 3.382
Wei Wang,Hang Yang,Yixin Liu,Xiaohan Yun,Yi Wei,Guogang Li
Establishing effective methods to optimize luminescent materials has been a significant challenge for white light-emitting-diode (WLED) applications. Herein, we successfully realized the adjustment of the photoluminescence and enhancement of the thermal stability of Ln3+ (Ln3+ = Ce3+, Eu3+)-doped Ca10−x/yBax/y(PO4)6O phosphors. First, Ba2+ ions from raw BaCO3 material realized a spectral red shift from 464 nm to 506 nm, which we suggested to be due to a synergistic effect from a centroid shift and crystal field splitting. When using BaHPO4 as a raw material, the PL intensity was 6.5 times that of the initial intensity. Surprisingly, the thermal stability was also improved, which was attributed to the increasing lattice distortion introducing many traps. Second, the Ca10(PO4)6O:Eu3+ red phosphor exhibited an abnormal emission phenomenon involving the 5D0 → 7F0 peak at 575 nm becoming the strongest emission peak and the 5D0 → 7F1 peak at 585 nm becoming particularly weak. The site symmetry and charge transfer states were speculated to be closely related to this phenomenon. The charge transfer states were not only correlated with the crystal field strength, but also related to f-electron delocalization, which significantly influenced the energy-level structure of Eu3+. More importantly, according to the relationship between the I(5D0 → 7F0)/I(5D0 → 7F1) ratio and the lattice structure, Eu3+ in the Ca10(PO4)6O compound could be applied as a probe to explore the matrix information, which would provide a helpful method to investigate the lattice structures of compounds and also guide researchers to design new suitable red phosphors.
研究领域:
材料科学
·
光学材料
·
无机化学
·
固体物理
·
发光学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 15
·2153
·
IF 5.3
Hao Cui,Daguang Li,Yu Yang,Yuewu Fu,Yanhui Dong,Jing Yin,Weiping Qin,Zhixu Jia,Dan Zhao
Polymer-based waveguide amplifiers are essential components in integrated optical systems, as their gain bandwidths directly determine the operating wavelength of optical circuits. However, development of the wideband gain media has been challenging, making it difficult to fabricate devices with broadband amplification capability. Rare earth ion-doped nanoparticles (NPs) are a key component in the gain media, and their full width at half maximum (FWHM) of the emission peak decides the final gain bandwidth of the gain media. Here, KMnF3: Yb, Er, Ce@KMnF3: Yb NPs with the broad full width at half maximum (FWHM) of the emission peak covering the S+C band was prepared. The NPs were synthesized using a hydrothermal method, and the FWHM of the emission peak of NPs reached 76 nm under the excitation of a 980 nm laser. The introduction of Ce3+ions and a core-shell structure coating greatly enhanced the emission intensity of NPs at C band. Since KMnF3: Yb, Er, Ce@KMnF3: Yb NPs have exceptional broadband luminescence properties at C band, KMnF3: Yb, Er, Ce@KMnF3: Yb NPs can be the potential gain medium in the future polymer-based waveguide amplifiers.Keywords:KMnF3;nanoparticles;active-shell;core-shell;1.5 μm
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROELECTRONICS RELIABILITY
·
2023
·
IF 1.6
Meiling Xie,Minghao Fang,Zhaohui Huang,Yan'gai Liu,Xiaowen Wu,Xin Min
Na 3 Gd(PO 4 ) 2 phosphors doped with rare-earth metal ions Ce 3+ and Tb 3+ were fabricated by the solid-state reaction method. Under the excitation of 340 nm light, the Ce 3+ -doped Na 3 Gd(PO 4 ) 2 phosphors exhibit a broad emission band ranging from 370 nm to 480 nm, which emitted blue light centered at 405 nm. When excited at 373 nm, the Tb 3+ -doped Na 3 Gd(PO 4 ) 2 phosphors presented a green light emission, including a strong peak located at 547 nm. In addition, both of the Na 3 Gd(PO 4 ) 2 : Ce 3+ and Na 3 Gd(PO 4 ) 2 : Tb 3+ phosphors showed excellent thermal stability at different temperatures, be specific in the Na 3 Gd(PO 4 ) 2 : Ce 3+ emission intensities at 150 °C could maintain about 84 % and the Na 3 Gd(PO 4 ) 2 : Tb 3+ could maintain about 92.9 % of those at room temperature. A prototype of the white light-emitting diodes lamp exhibiting bright white light was fabricated by using a 365 nm near-ultraviolet-emitting LED chip, combined with Na 3 Gd(PO 4 ) 2 : Ce 3+ blue phosphors, Na 3 Gd(PO 4 ) 2 : Tb 3+ green phosphors, and Na 3 Gd(PO 4 ) 2 : Eu 3+ red phosphors , which produced a high color rendering index of 89.4, and a relatively low correlated color temperature of 5496 K. Moreover, the CIE point was calculated to be at (0.3332, 0.3438), locating in the white light region. These results indicate that the as-prepared phosphors can be considered as potential candidates for ultraviolet/near-ultraviolet light-excited white light-emitting diodes applications.
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
DESALINATION
·
2025
·
IF 9.8
Silin Li,Wenjie Zheng,Wenlan Ji,Yunfei Shi,Tian Ren,Shihao Zhang,Xiao Wei,Yibin Wei
Catalytic ceramic membranes with ozonation have been considered promising for efficient organic pollutants degradation in water. Herein, cerium oxide-doped silicon carbide (Ce@SiC) ceramic membranes were developed via in-situ embedding CeO 2 nanoparticles into the porous SiC membrane that can be coupled with catalytic ozonation for efficient ciprofloxacin (CIP) degradation. Notably, the optimized Ce@SiC membrane with ozonation could achieve 94.3 % CIP degradation efficiency within 60 min, outperforming ozonation (63.4 %) or pristine SiC (66.1 %) alone. Meanwhile, the membrane showed excellent total organic carbon mineralization of 66.4 % for the CIP, which was significantly higher than that of using ozonation (19.8 %) or pristine SiC (30.1 %) alone, demonstrating enhanced oxidation efficiency. The high performance is attributed to the abundant oxygen vacancies on the Ce@SiC membrane surface, which facilitate ozone decomposition into hydroxyl ( OH) and superoxide ( O 2 − ) radicals, and the synergistic effect of the Ce 3+ /Ce 4+ redox cycle. The membrane not only exhibited robust catalytic stability in cycling experiments, but also excellent resistance to ion interference. Furthermore, the high catalytic performance was mainly attributed to the rich oxygen vacancies on the Ce@SiC membrane surface, which facilitates ozone decomposition into OH and O 2 − . This work offers a sustainable strategy of coupling catalytic ozonation with ceramic membrane for refractory antibiotics degradation.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理技术
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2024
·
IF 6.7
Meng Zhaohui,Liao Ying,Liu Ling,Li Yaqian,Yan Hao,Feng Xiang,Chen Xiaobo,Liu Yibin,Yang Chaohe
Improving the efficiency of metal/reducible metal oxide interfacial sites for hydrogenation reactions of unsaturated groups (e.g., C=C and C=O) is a promising yet challenging endeavor. In our study, we developed a Pd/CeO 2 catalyst by enhancing the oxygen vacancy (O V ) concentration in CeO 2 through high-temperature treatment. This process led to the formation of an interface structure ideal for supporting the hydrogenation of methyl oleate to methyl stearate. Specifically, metal Pd 0 atoms bonded to the O V in defective CeO 2 formed Pd 0 –O V –Ce 3+ interfacial sites, enabling strong electron transfer from CeO 2 to Pd. The interfacial sites exhibit a synergistic adsorption effect on the reaction substrate. Pd 0 sites promote the adsorption and activation of C=C bonds, while O V preferably adsorbs C=O bonds, mitigating competition with C=C bonds for Pd 0 adsorption sites. This synergy ensures rapid C=C bond activation and accelerates the attack of active H* species on the semi-hydrogenated intermediate. As a result, our Pd/CeO 2 -500 catalyst, enriched with Pd 0 –O V –Ce 3+ interfacial sites, demonstrated excellent hydrogenation activity at just 30 °C. The catalyst achieved a Cis–C18:1 conversion rate of 99.8% and a methyl stearate formation rate of 5.7 mol/(h·g metal ). This work revealed the interfacial sites for enhanced hydrogenation reactions and provided ideas for designing highly active hydrogenation catalysts.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Yingwei Gao,Shuo Zhang,Bo Ge,Hui Zhao,Chuanyu Jin,Hui Yan,Limin Zhao
The high thermal stability and chemical durability of amide-linked covalent organic frameworks (amide COFs) make them a promising material for a range of new applications. Nevertheless, the low reversibility of the amide bond presents a significant challenge to the direct synthesis of amide-bonded COFs. In this paper, we present a simple method for synthesizing amide COFs. The synthesis of imine-linked COFs was initially achieved through the reaction of 2,4,6-tris(4-aminophenyl)-1,3,5-triazine and 2,5-dimethoxybenzene-1,4-dicarboxaldehyde. Subsequently, amide COFs were synthesized via the oxidation of the imine bond into an amide bond, utilizing ammonium persulfate as the oxidizing agent. Due to the difference of link bond, two COFs separately displayed distinct and significant fluorescence enhancement for Al 3+ and Ce 3+ , which was highly sensitive and less affected by environmental factors. The strategy offers a novel approach to the convenient and environmentally benign synthesis of amide COFs, which may facilitate their wider applications.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Taoli Deng,Zan Ding,Shuang Zheng,Rong-Jun Xie
Ce3+-doped nitride phosphors are promising color converters in laser-driven lighting and display technologies, but they suffer from serious loss in luminescence efficiency caused by the interfacial reaction between phosphor powders and glass powders during the fabrication of phosphor-in-glass bulks or films. In this work, the oxygen-free organic–inorganic hybrid glass (OIHG) Zn(Im)3(HbIm) (ZIF-62) was used instead of the traditional oxide glass to prepare an La3Si6N11:Ce3+ (LSN) phosphor converter by cofiring LSN with the ZIF-62 glass. The LSN phosphor-in-ZIF-62 glass converter well maintains the internal quantum efficiency of the original phosphor powders, showing a luminescence loss of only ∼1%. The sandwich-structured LSN-in-ZIF-62 glass converter, constructed by cofiring it with sapphire substrates, enables the generation of white lighting with a maximum luminous flux of 872.2 lm and a luminous efficacy of 291 lm W−1 when pumped by a blue laser diode at a powder density of 5.99 W mm−2. The use of the oxygen-free ZIF-62 glass provides a viable method to design nitride phosphor-based color converters for low-power laser-driven lighting, high-power LED lighting or projection applications.
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 LUMINESCENCE
·
2025
·
IF 3.6
Xu Sun,Yumeng Jia,Jing Wang,Yingnan Dong,Yanhua Sun,Zhongxiang Shi
Na-β"-Al 2 O 3 matrix materials, featuring a stable layered structure and Na + ions double sites, are promising as host materials for luminescent applications. In this work, a series of broadband Na-β"-Al 2 O 3 : x Eu 2+ , 0.08Ce 3+ cyan phosphors were designed and synthesized. Based on the ability of Eu 2+ to occupy two Na + sites in the Na-β"-Al 2 O 3 matrix, the photoluminescence (PL) spectra displayed dual-peak emissions centered at 470 and 500 nm, with a full width at half maximum (FWHM) of 140 nm. The Na-β"-Al 2 O 3 : Eu 2+ , Ce 3+ phosphors have excellent thermal stability (95.1 %@448 K). Finally, the fabricated white-light-emitting diodes (WLEDs) with CIE 1931 chromaticity coordinates of (0.32, 0.35) and a correlated color temperature (CCT) of 6015 K, indicating their potential for application in full-spectrum WLEDs.
研究领域:
材料科学
·
发光材料
·
光电子学
·
固态照明
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Aynigar Ablat,Min Yin,Shihang Zhou,Aierken Sidike
Ce 3+ -doped Ca 2 BO 3 Cl and Ca 3 (BO 3 ) 2 are presented as promising phosphors for solid-state white light illumination, display, phototherapy, etc. Herein, we combined experimental and first-principles calculations to study the photoluminescence properties of Ce 3+ -doped Ca 2 BO 3 Cl and Ca 3 (BO 3 ) 2 under different preparation environment. The results show that the co-doped Na + ions have little effect on the luminescence of Ce 3+ ions doped Ca 2 BO 3 Cl and Ca 3 (BO 3 ) 2 . However, the luminous intensity of Ce 3+ /Na + ions co-doped Ca 2 BO 3 Cl greatly decreased with increasing oxidizing atmosphere. When sintering at 800 °C in air, the luminescence intensity was more than 10 times lower than that in a reducing atmosphere (5 % H 2 + 95 % N 2 ), whereas the luminescence intensity of Ce 3+ -doped Ca 3 (BO 3 ) 2 hardly changed. First-principles calculations revealed that, within an enhanced oxidizing atmosphere, the formation energy of interstitial oxygen (O i ) in Ca 2 BO 3 Cl:Ce 3+ ,Na + decreased from 2.84 to 0.31 eV, whereas in Ca 3 (BO 3 ) 2 :Ce 3+ , it decreased from 2.11 to 1.51 eV. The small formation energy (0.31 eV) of interstitial oxygen (O i ) in an oxidation atmosphere may lead to the formation of interstitial oxygen defects in Ca 2 BO 3 Cl:Ce 3+ ,Na + , which may result in the luminescence quenching of Ce 3+ ions in Ca 2 BO 3 Cl:Ce 3+ ,Na + ((Ce 3+ )∗+O 0 →Ce 4+ +O 1− ) and cause a decrease in the luminescence intensity. The study of the difference in resistance to oxidation between Ce 3+ -doped Ca 2 BO 3 Cl and Ca 3 (BO 3 ) 2 is highly important for further improving current luminescent materials and developing new functional materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Mingen Ma,Gang Yang,Mengmeng Dai,Xiumei Xu,Xiaochong Wang,Shaobo Cui,Yongsheng Zhu
Rare earth doped nanomaterials have attracted considerable attention in photonics and information security due to their tunable multicolor luminescence and rapid response properties. However, achieving dual-mode luminescence with tunable emission colors in a single material remains a significant challenge. Herein, NaYF 4 :Yb/Ho/Ce@NaYF 4 :Ce/Tb core-shell nanocrystals were synthesized, which exhibit dual-excitation response under both 254 nm ultraviolet and 980 nm near-infrared light sources. This innovative design facilitates tunable upconversion luminescence through the cross-relaxation process between Ce 3+ and Ho 3+ ions in the inner cores. Moreover, the system exhibits synergistic downshifting luminescence attributed to the energy transfer from Ce 3+ to Tb 3+ ions in the shells. By combining upconversion and downshifting luminescence, this dual-functional platform delivers a versatile and highly efficient solution for advanced security-related applications.
研究领域:
材料科学
·
纳米科技
·
光子学
·
信息安全部件
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 11
·19814-19821
·
IF 5.1
Weichang Li,Danping Chen,Lili Hu,Dongbing He,Shubin Chen,Chunlei Yu,Sen Qian,Zhehao Hua,Gao Tang,Ren Jing,Xinyuan Sun,Minghui Zhang,Shan Liu,Hua Cai,Jifeng Han,Shenghua Yin
The large size (4 cm × 4 cm × 1 cm) Ce 3+ -doped high gadolinium oxyfluoride glass with density of 5.83 g/cm³ was prepared by the melt quench method at 1220 °C. The glass is colorless and transparent over the visible range. The prolonged decay time under 275 nm UV light demonstrates the energy transfer from Gd 3+ ions to Ce 3+ ions. The X-ray excited luminescence spectra (XEL) show the emission peak corresponds to the 5d→4f transitions of Ce 3+ ion. The integral emission intensity of glass was compared with that of bismuth germanate oxide (BGO) crystals. The scintillation property of glass was studied under the γ -ray from 137 Cs source and a clear energy peak was observed with light yield (LY) over 1100 ph/MeV. The scintillation decay time comprises fast and slow components. All results presented in this work indicate the appropriate potential to be high-energy rays detecting material for CEPC .
研究领域:
材料科学
·
核物理探测
·
光学材料
·
高能物理
·
无机非金属材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yu Zhang,Xuejie Zhang,Haoran Zhang,Zhan-Chao Wu,Yingliang Liu,Li Ma,Xiaojun Wang,Wei-Ren Liu,Bingfu Lei
A series green emission phosphors Sr 3 Lu 2 (BO 3 ) 4 :Ce 3+ ,Tb 3+ (denoted as SLBO:Ce 3+ ,Tb 3+ ) with broad absorption band matching well with UV LED chip were synthesized by the solid–state reaction method. The phase and structure were analyzed with XRD , EDX , FT-IR measurements. The energy transfer between Ce 3+ and Tb 3+ in SLBO was proved by spectra and decay curves detailedly. The emission colors vary from blue to green by adjusting the ratio of Ce 3+ /Tb 3+ doped concentration. With temperature increasing, SLBO:Ce 3+ ,Tb 3+ phosphor shows well thermal stability that emission intensity retains 70% of its initial at 25 °C even temperature rising to 150 °C. The internal and external quantum efficiency of SLBO:3%Ce 3+ ,8%Tb 3+ are 77.5% and 34.8% under 340 nm excitation, respectively. Combining the as-synthesized SLBO:Ce 3+ ,Tb 3+ and red emission phosphor CaAlSiN 3 :Eu 2+ coated on a 365 nm UV chip, a warm white LEDs device with CRI of 83 was achieved. All the results indicate that the SLBO:Ce 3+ ,Tb 3+ phosphor has potential application in UV pumped white LEDs.
研究领域:
材料科学
·
光电子学
·
发光材料
·
固态照明
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）