JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Nan Ma,Zongjie Zhang,Wei Li,Xiaoyong Huang
Bright cyan-emitting phosphor is indispensable to fill the cyan gap for the fabrication of full-visible-spectrum warm-white light-emitting diodes (LEDs) with high color rendering index (CRI). In this study, we demonstrate a novel efficient cyan-emitting Ce 3+ -activated CaLu 2 HfScAl 3 O 12 (CLHSA) garnet phosphor for application in blue-light-excited full-spectrum warm-white LEDs. CLHSA:Ce 3+ phosphors show broadband excitation spectra in the 300–470 nm spectral range with a maximum peak at 408 nm, indicating they can be efficiently pumped by the blue LED chips. The optimal doping concentration of Ce 3+ ions is found to be 1 mol%. Upon 408 nm excitation, the optimal CLHSA:1%Ce 3+ phosphor gives rise to a bright broadband cyan emission (peak position: 498 nm; bandwidth: 97.5 nm) with CIE chromaticity coordinates of (0.2196, 0.4265) and high photoluminescence quantum yield of 64.5%. Finally, we have fabricated a blue-light-excited high-CRI warm-white LED device by employing the CLHSA:1%Ce 3+ cyan phosphor, commercial YAG:Ce 3+ yellow phosphor and commercial CaAlSiN 3 :Eu 2+ red phosphor as well as a 450 nm LED chip, which demonstrates a bright warm-white light emission with a high CRI (Ra = 92.6), a low correlated color temperature (3660 K), and good CIE chromaticity coordinates of (0.3993, 0.3939) as well as a high luminous efficacy of 45 lmW −1 . Therefore, this newly discovered efficient cyan-emitting CLHSA:1%Ce 3+ phosphor is promising for application in blue-chip-pumped full-visible-spectrum warm-white LEDs with high CRI values.
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
·
2020
·
IF 3.28
Zongjie Zhang,Jia Liang,Liangling Sun,Shaoying Wang,Qi Sun,Balaji Devakumar,Sami Rtimi,Xiaoyong Huang
In this study, in order to get near-ultraviolet-excitable cyan-emitting phosphors for white light-emitting diodes (LEDs), Ce 3+ ions were successfully doped into the newly discovered Ca 2 YHf 2 Ga 3 O 12 (CYHG) matrix through the high-temperature solid-state reactions. The obtained samples exhibited a broad excitation band in the 250–450 nm wavelength range centered at about 346 nm and 398 nm, and they showed an intense cyan emission band in the 410–600 nm wavelength range peaking at about 479–485 nm Ce 3+ doping concentration dependent luminescence properties in CYHG: x Ce 3+ phosphors were studied, and the optimal Ce 3+ doping concentration was found to be x = 0.04. Furthermore, the energy transfer mechanism between Ce 3+ ions was confirmed as the dipole-dipole interaction, which induced the observed concentration quenching effect. Notably, upon excitation by near-ultraviolet light at 398 nm, the CIE chromaticity coordinates of CYHG:0.04Ce 3+ sample were obtained to be (0.182, 0.276), which were located in the cyan color range. Besides, the internal quantum efficiency (IQE) values of these CYHG: x Ce 3+ phosphors were measured, and the highest one reached up to 26%. These newly developed cyan-emitting CYHG:Ce 3+ phosphors might find potential application in high-color-rendering white LEDs by covering the so-called cyan gap.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Xiao Wei,Xuan Fang,Shuming Ma,Huaqiang He,Zhixin Wu,Silin Li,Shihao Zhang,Pei Nian,Wenlan Ji,Yibin Wei
Addressing the contamination of antibiotics has attracted ever-increasing and imperative attention due to their widespread existence, easy-to-cause drug-resistant bacteria infection, coupled with their intrinsic toxicity and hazard to environments and human health. Herein, a novel CC/CoNi-LDH-10%Ce anode material was directly constructed through a simple and rapid electrodeposition strategy, serving as an efficacious electrocatalyst for removing ciprofloxacin (CIP) from aqueous solution. Such novel CC/CoNi-LDH-10%Ce anode delivered a higher charge transfer, relatively abundant oxygen vacancies, and a higher electrochemical active area. The as-fabricated CC/CoNi-LDH-10%Ce electrode achieved a substantially boosted CIP removal efficiency of 52.5% relative to that of pure CC at about 23.9%. Notably, doping an appropriate amount of Ce 3+ can endow the pristine CC/CoNi-LDH with richer oxygen vacancies and excellent electrocatalytic performance. Additionally, the electrocatalytic oxidation of CIP was attributed to both direct oxidation on the electrode surface and indirect oxidation induced by the generated active species (superoxide radicals and hydroxyl radicals). This study provides a simple, universal and flexible tactic for other researchers in designing and manufacturing avenues of electrodes.
研究领域:
环境科学
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Chengke Tan,Junhang Tian,Jihuan Xie,Yingnan Liu,Qi Liu,Weidong Zhuang
Luminescent properties of phosphors can be modified and improved by constructing energy transfer. In this article, a series of Ce3+- and/or Eu2+-doped Ca-α-sialon phosphors were synthesized through the traditional solid-state reaction method. The construction of an efficient energy transfer enables the modulation of a wide range of light colors, thereby facilitating a gradual color change from blue-green (0.1844, 0.2535) to yellow (0.4282, 0.5051). Moreover, the codoping of Ce3+ enhances the luminescence intensity of Eu2+ by approximately 2.2 times. Within the experimental gradient, the energy-transfer efficiency can reach up to 58.7%, and the energy-transfer mechanism is a quadrupole–quadrupole interaction. Gaussian fitting of the emission spectrum of the codoped samples reveals that the intensities of the Eu2+ and Ce3+ emission peaks of the codoped samples at 423 K are 78 and 87% of those at room temperature, respectively. Moreover, the thermal stability of the characteristic peaks of Ce3+ in the codoped samples is significantly enhanced compared to those doped alone. These excellent properties highlight the potential application of CaSi9Al3ON15/Ce3+, Eu2+ phosphor in white light WLEDs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 23
·5113-5123
·
IF 6.569
Runtian Kang,Hang Chen,Ruijie Ji,Haoyang Wang,Takatoshi Seto,Yuhua Wang
It is of great significance for white light-emitting diodes (wLEDs) to explore new, efficient and stable inorganic phosphors excited by wideband near-ultraviolet (n-UV) light. A new type of efficient emission-tunable Ce3+/Mn2+ doped Ca2YHf2Al3O12 (CYHAO) garnet phosphor which can be excited by n-UV light is studied in this work. Due to the effective energy transfer (ET) from Ce3+ to Mn2+ in CYHAO, CYHAO:0.09Ce3+,xMn2+ phosphors have a wide excitation band in the 370–470 nm region with a peak at 410 nm. Under excitation at 410 nm, all the samples show tunable color emission and match with the near UV chip. Through the decay time, it is determined that the energy transfer efficiency is as high as 88.83%. The calculated activation energy is about 0.217 eV, indicating the relatively good thermal stability. The cathodoluminescence (CL) properties show that the phosphor has a high saturation current and saturation voltage. A single component white LED is fabricated by using the CYHAO:0.09Ce3+,0.3Mn2+ phosphor and a 400 nm n-UV chip. It is worth noting that the detailed study of the energy transfer mechanism, thermal quenching mechanism and CL mechanism has reference value for the development of new co-doped phosphors.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2022
·Vol. 19
·期 6
·3392-3402
·
IF 2.328
Tong Shi,Fan Zhang,Wuyou Sun,Jinrui Li,Yu Bai,Chao Wang,Shiying Liu,Xin Wang,Yunhong Yang,Zhan jie Wang
In this study, 0.94Mg (1-3 x /2) Ce x TiO 3 −0.06(Ca 0.8 Sr 0.2 )TiO 3 (MCe x T−CST, 0≤ x ≤0.01) composite ceramics were prepared at a low temperature of 1175°C by using the 50-nm-sized powders. The effects of Ce 3+ doping on crystalline phase, microstructure, and microwave dielectric properties of MCe x T−CST were studied. A main ilmenite (Mg,Ce)TiO 3 phase and a minor perovskite (Ca 0.8 Sr 0.2 )TiO 3 phase coexist well with the appearance of impurity MgTi 2 O 5 phase in MCe x T−CST. The dielectric properties of MCe x T−CST are affected by the molecular polarizability, the impurity phase, and the Ce 3+ doping. The replacement of Mg 2+ by high valence Ce 3+ could effectively inhibit the formation of oxygen vacancy, resulting in the enhancement of Q×f . When x = 0.005, MCe x T−CST exhibits microwave dielectric properties with a moderate ε r of 21.5, a high Q×f of 67 000 GHz, and a near-zero τ f of −0.74 ppm/°C. The results reveal that the Ce 3+ substitution is a prospective approach to optimize the microwave dielectric properties of MgTiO 3 -based ceramics.
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2019
·Vol. 15
·期 17
·1900289
·
IF 10.856
Hao Dong,Lei Zhang,Lulu Li,Wanyu Deng,Congling Hu,Zhi-Jian Zhao,Jinlong Gong
The electroreduction of CO 2 to CO provides a potential way to solve the environmental problems caused by excess fossil fuel utilization. Loading transition metals on metal oxides is an efficient strategy for CO 2 electroreduction as well as for reducing metal usage. However, it needs a great potential to overcome the energy barrier to increase CO selectivity. This paper describes how 8.7 wt% gold nanoparticles (NPs) loaded on CeO x nanosheets (NSs) with high Ce 3+ concentration effectively decrease the overpotential for CO 2 electroreduction. The 3.6 nm gold NPs on CeO x NSs containing 47.3% Ce 3+ achieve CO faradaic efficiency of 90.1% at −0.5 V in 0.1 m KHCO 3 solution. Furthermore, the CO 2 electroreduction activity shows a strong relationship with the fractions of Ce 3+ on Au-CeO x NSs, which has never been reported. In situ surface-enhanced infrared absorption spectroscopy shows that Au-CeO x NSs with high Ce 3+ concentration promote CO 2 activation and *COOH formation. Theoretical calculations also indicate that the improved performance is attributed to the enhanced *COOH formation on Au-CeO x NSs with high Ce 3+ fraction.
研究领域:
材料科学
·
环境科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Teng Zheng,Laihui Luo,Peng Du,Stefan Lis,Ulises R Rodríguez-Mendoza,Víctor Lavín,Inocencio R. Martín,Marcin Runowski
To overcome the challenges of pressure monitoring with high sensitivity, we have designed a series of Ce 3+ -activated Ca 2 Gd 8 Si 6 O 26 phosphors with outstanding pressure sensing properties. Excited with UV light, the resultant phosphors can emit a blue-violet luminescence, originating from optically active Ce 3+ ions. The optimal doping content for Ce 3+ ions in the Ca 2 Gd 8 Si 6 O 26 host lattices is 3 mol%, for which the concentration quenching mechanism is dominated by the electric dipole–dipole interaction. The thermal stability of the prepared phosphors was explored by measuring temperature-dependent emission spectra, and determining the activation energy, which is ∼ 0.225 eV. Furthermore, in order to study the pressure sensing ability of the designed phosphors, their luminescence spectra were recorded as a function of pressure up to ∼ 10 GPa. With increasing pressure, an abnormal enhancement of emission intensity was observed, with an enormous red-shift of the emission band of 3.00 nm/GPa, and a decreasing full width at half maximum (FWHM) of − 2.45 nm/GPa for the synthesized phosphors. The determined performance of the sensors developed now classifies them as the most sensitive pressure gauges, i.e., the shift rate is approximately one order of magnitude higher than that of the commonly used ruby sensor. Importantly, the developed pressure sensor shows a negligible temperature dependence, i.e., 0.0023 nm/K for the line-shift and 0.0017 nm/K for the FWHM, and an ultrafast response due to the short emission lifetime of the Ce 3+ excited state of ∼ 20 ns. Additionally, the structural stability of the compounds under pressure is verified by Raman spectroscopy up to ∼ 11 GPa. These results make the Ce 3+ -activated Ca 2 Gd 8 Si 6 O 26 phosphors a promising candidate for ultrasensitive manometry and provide some guidelines for the development of novel pressure sensors.
研究领域:
材料科学
·
光学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Dong Yang,Kun Ge,Huiyun Ban,Xinyang Chu,Shan Liu,Sen Qian,Zhehao Hua,Hua Cai,Danping Chen,Jinsheng Jia,Xinyuan Sun,Jing Ren,Gao Tang,Minghui Zhang,Jiawen Xiao,Yiping Du
High transparency Ce 3+ -doped dense gadolinium aluminum borosilicate (GS x ) glass scintillator was synthesized in reducing atmosphere by melt-quenching process. The transmittance of the glasses exceeds 80%, and the light attenuation length is between 5-20 cm within the range of 400–600 nm. GS x glass shows an photoluminescence (PL) in range of 350–550 nm, with the strongest emission peak around 420 nm. The PL decay time of GS x glasses is around 37 ns, with a maximum PL quantum yield of 44.05%. The integrated X-ray excited luminescence (XEL) intensity of GS S glass is 52.5% compared with BGO crystal. For X-ray imaging, GS L glass based imaging system shows a high spatial resolution of 9 lp/mm, which is comparable to CsI:Tl X-ray detectors. Under γ-ray, the highest light yield of GS S glass is 1235 ph/MeV with an energy resolution of 24.0% at 662 keV, close to that of BSO crystal. The scintillation decay time of GS x glasses is consisted of fast (∼100 ns) and slow (∼560 ns) components. In thermally stimulated luminescence (TSL), GS S glass exhibits a strong TSL peak at approximately 440 K, with low intensity shoulders at about 520 K, implying different types of defects and traps. Therefore, GS x glass has promising prospects for X-ray imaging and high-energy physics applications.
研究领域:
材料科学
·
核技术应用
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Cijun Shuai,Kangdong Wang,Shuping Peng,Jun Zan,Jiang Xiao,Shun Hu,Qi Zhong
CeO 2 nanozymes have garnered significant attention in chemodynamic therapy due to their peroxidase-like activity and ability to deplete glutathione. However, their catalytic efficiency is constrained by the low conversion rate of Ce 3+ /Ce 4+ . To overcome this limitation, the electron transfer was accelerated by introducing the transition metal Mn atom as a valence electron donor through lattice charge transfer. In detail, we introduced Ce 1-x Mn x O 2 into the poly-L-lactic acid (PLLA) scaffold fabricated by selective laser sintering. The conversion from Ce 3+ to Ce 4+ promoted the decomposition of H 2 O 2 within the tumor microenvironment to generate hydroxyl radicals with high oxidative activity, consequently inducing oxidative stress. The conversion from Ce 4+ to Ce 3+ depleted intracellular antioxidant glutathione, disrupting redox balance in tumor cells. This continuous redox cycle ultimately triggered apoptosis in tumor cells. Using a first-principles Hubbard-corrected approximate density-functional method, the analysis of the electron band structure revealed the presence of donor energy levels within the bandgap of Ce 1-x Mn x O 2 , enabling electron transfer channels around 0.645 eV. Electrochemical experiments confirmed that Ce 0.8 Mn 0.2 O 2 significantly reduced the activation overpotential from 0.907 V to 0.646 V, enhancing its redox capacity. As a result, the scaffold exhibited a threefold increase in tumor-killing rate. These findings highlight the immense potential of CeO 2 nanozymes in enhancing chemodynamic therapy for effective tumor treatment.
研究领域:
生物医学工程
·
肿瘤治疗学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Yuhui Zhang,Xuanping Tan,Ligang Xing,Huan Wu,Jidong Yang
Two chiral drugs, ephedrine (EH) and pseudoephedrine (PEH), were commonly used in clinical treatment. Ephedrine (EH) and pseudoephedrine (PEH) could make different changes in resonance Rayleigh scattering spectrum of the detection system which use Ce 3+ functionalized gold nanoparticles as probe. Therefore, a new method of detecting EH and PEH separately was developed. The RRS spectrum and UV–Vis absorption spectrum of AuNPs-Ce 3+ detection system was analyzed in order to discuss the mechanism. Under optimal experimental conditions, the linear range of EH and PEH were 20–920 ng/mL and 40–520 ng/mL, respectively. The detection limit were 1.9 ng/mL and 3.8 ng/mL, respectively. Last used for actual testing, this method had obtained good results.
研究领域:
分析化学
·
药物分析
·
生物医学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 26
·11026-11037
·
IF 6.7
Jikun Wang,Chunsheng Li,Yujie Cui,Qiang Wang,Jin Ye,Jie Yang,Zhongyuan Liu,Su Zhang,Yujie Fu,Jiating Xu
Second near-infrared (NIR-II, 1000–1700 nm) photon-mediated fluorescence imaging has attracted extensive interest in the field of bioimaging. However, NIR-II fluorescent nanoprobes competent for plant imaging have been rarely developed. Herein, lanthanide-doped nanoparticle (LDNP) optimal core–shell structure and ultrabright NIR-II emission were developed for “lighting” plants. The Ce3+-doped active shell coated on the NaErF4:Tm core enables dual-mode red upconversion (UC) and NIR-II downconversion (DC) emission of LDNPs upon 980 nm laser excitation. Under the optimized doping content, the intensities of red UC and NIR-II DC emission were respectively boosted by 5- and 19-fold those of the core nanoparticles, which endowed LDNPs with ideal NIR-II emissive capabilities for optical imaging of plants. Significantly, the NIR-II fluorescent signal affords much higher signal-to-noise rate than the red UC. LDNPs were modified with polyethyleneimine to enable outstanding hydrophilicty and facilitate their uptake by plants. Arabidopsis thaliana and Nicotiana benthamiana were chosen as plant models for NIR-II imaging studies. The toxic effect of LDNPs after being transported into Brassica rapa chinensis was systematically studied on mice. The NIR-II imaging strategy offers a promising method for studying the uptake and transport of nanoparticles in plants.
研究领域:
植物学
·
生物成像
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）