JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 31
·15887-15893
·
IF 5.968
Hongde Luo,Jie Liu,Xiao Zheng,Lixian Han,Kuaixia Ren,Xibin Yu
Trivalent ions B3+, Al3+ and Ga3+ have been introduced into Sr3SiO5:Ce3+ in this study. Among these ions, Al3+ and Ga3+ act as charge compensators and significantly enhance the maximum emission of Ce3+ by about 100% and 90%, respectively. Then, Al3+, Eu2+ co-doped Sr3SiO5:Ce3+ phosphors have been researched, which indicate that the emission spectra can be tuned from 530 to 575 nm by changing the concentration of Eu2+. The CIE chromaticity coordinates of the phosphors were calculated from (0.342, 0.518) to (0.442, 0.479). This indicates a potential for applications in daylight LEDs or warm-white LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xiaoshuang Li,Chengjue Guo,Hongwei Wang,Yeqing Chen,Jiangcong Zhou,Jun Lin,Qingguang Zeng
By hetero-valence substituting Ba 2+ -Si 4+ for Lu 3+ -Al 3+ pair in Lu 3 Al 5 O 12 : Ce 3+ , a new green phosphor Ba 1.5 Lu 1.5 Al 3.5 Si 1.5 O 12 : Ce 3+ (BLAS: Ce 3+ ) has been obtained. It crystallizes in garnet structure with space group Ia -3 d (230). In the structure, Ba 2+ ions are incorporated into both dodecahedral Lu 3+ and octahedral Al 3+ sites while Si 4+ ions only occupy tetrahedral Al 3+ sites. Under the blue light irradiation of 450 nm, an intense green light peaking at 520 nm was observed and the PL spectrum can be fitted in two Gaussian components, due to the crystal field splitting of Ce 3+ 5 d states under D 2 symmetry constrains. The optical doping concentration of BLAS: Ce 3+ is 6% mol, of which the IQE and EQE are 89.1% and 51.8%, respectively. Furthermore, this sample exhibits an extremely good thermal stability, i.e. the integrated emission intensity is still more than 90% of the initial intensity at 480 K. Then, a w-LED device was fabricated from this new green phosphor BLAS: Ce 3+ and commercial red phosphor (Ca,Sr)AlSiN 3 : Eu 2+ , which shows a quite high color rendering (Ra = 88.2) and a relatively low color temperature 4772 K. Besides, the phosphor exhibits a stable chromaticity under different acceleration voltages. The phosphor may be promising material for the development of solid-state lighting and display systems.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Tao Pang,Mingyue Cai,Qiqi Chen,Jianping Xie,Ronghua Jian,Wenhui Lu
NaYF 4 :Yb 3+ /Ho 3+ /Ce 3+ upconversion phosphors were synthesized by using a citric acid assisted hydrothermal method . Both increasing the concentration of Ce 3+ and decreasing the Yb 3+ content are beneficial to the formation of cubic NaYF 4 . When the concentration of Yb 3+ /Ho 3+ /Ce 3+ were 20/1/20 and 5/1/10, respectively, a pure cubic phase was obtained. The spectral conversion from green to red was achieved by first increasing Ce 3+ concentration to 10% and then decreasing the Yb 3+ concentration to 5%. In the first half, the two cross relaxation processes between Ho 3+ and Ce 3+ were responsible for the modulation of the luminescence, while in the latter half, the enhanced intensity ratio of red to green emission was related to the decreased energy transfer from Ho 3+ to Yb 3+ . Except for the sample doped with 5% Yb 3+ , 1% Ho 3+ and 10% Ce 3+ , the total emission intensity of other samples decreased linearly with increasing sample temperature. The maximum responsibility was obtained in the case of 20% Yb 3+ , 1% Ho 3+ and 5% Ce 3+ doping. Compared to the Er 3+ based luminescent temperature sensing, this novel temperature sensing not only shown little impact from pump power, but also had the identical sensitivity at various temperatures, and thus being a promising candidate for temperature sensing.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2018
·Vol. 47
·期 8
·4929-4935
·
IF 1.566
Lu Zuizhi,Fu Anjie,Xia Siyu,Guan Anxiang,Meng Yingbin,Zhou Liya
Ba 2 Mg 2 Al 6 Si 9 O 30 (BMAS):Ce 3+ , Tb3 + phosphor powder was synthesized by a high-temperature solid-state method. The excitation spectra of BMAS:Ce 3+ , Tb 3+ phosphors showed a strong and broad absorption band, which ranged from 220 nm to 380 nm. With the excitation of 350 nm, the characteristic emission peaks centered at 544 nm of Tb 3+ and at 420 nm of Ce 3+ were observed. With increased Ce 3+ concentration from 0.01 to 0.13, energy-transfer efficiency increased from 3.26% to 76.59%. Adjustment of the Ce 3+ to Tb 3+ ratio can induce the emission peak of the samples to change from blue to green.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Yibo Chen,Jin He,Xinguo Zhang,Mingcong Rong,Zhiguo Xia,Jing Wang,Zhao-Qing Liu
There is a challenge for noncontact temperature-sensing techniques and the related materials, in which a highly reliable contactless thermometer probe with low cost and high sensitivity is in demand. Here, the Lu3Al5O12:Ce3+/Mn4+ phosphor has been designed and prepared for the high-performance fluorescence temperature-sensing application in a novel one-pot, self-redox, solid-state process. Benefiting from the different electron–lattice/phonon interactions of Ce3+ and Mn4+, two distinguishable emission peaks with significantly different temperature responses originating from Ce3+ and Mn4+ are realized. Applying the fluorescence intensity ratio of Mn4+ versus Ce3+ and the decay lifetime of Mn4+ emission as the temperature readout, a dual-mode optical temperature-sensing mechanism was proposed and studied in the temperature range of 100–350 K. The maximum relative sensitivities (Sr) are derived as 4.37 and 3.22% K–1 respectively, as well as a large chromaticity shift visible to naked eyes (ΔE = 153 × 10–3 in 100–350 K) is observed. This is the first report of a Ce3+,Mn4+ co-doped dual-emitting phosphor, and its unique optical thermometric features demonstrate the high potential of Lu3Al5O12:Ce3+/Mn4+ as an accurate and reliable thermometer probe candidate.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Renping Cao,Zhuyang Jiang,Ting Chen,Huang Liang,Xuehua Yi,Yuancong Zhong,Haining Zhang,Wei Luo
In this work, we synthesize successfully Na 4 CaSi 3 O 9 :R (R = Ce 3+ , Sm 3+ , and Ce 3+ /Sm 3+ ) phosphors in the reducing atmosphere (95% N 2 + 5% H 2 ) by using the high-temperature solid-state method. The crystal structure and luminescence properties of samples are investigated. The excitation spectrum of Na 4 CaSi 3 O 9 :Ce 3+ phosphor is observed in the range of 220–400 nm due to the 4 f → 5 d transitions of Ce 3+ ion. The emission spectrum contered at ∼425 nm of Na 4 CaSi 3 O 9 :Ce 3+ phosphor is in the range of 360–650 nm owing to the 5 d → 2 F 5/2 and 2 F 7/2 transitions of Ce 3+ ion. Na 4 CaSi 3 O 9 :Sm 3+ phosphor can show the excitation spectrum in the range of 200–550 nm owing to the O 2− - Sm 3+ charge transfer band and the f - f transitions of Sm 3+ ion, and its emission spectrum covers the region from 575 nm to 750 nm with four emission bands because of the 4 G 5/2 → 6 H 5/2 , 6 H 7/2 , 6 H 9/2 , and 6 H 11/2 transitions of Sm 3+ ion. The tunable emission, luminescence improvement, temperature-dependent emission, and lifetime in Na 4 Ca 0.96-x Si 3 O 9 :4 mol%Ce 3+ , xSm 3+ phosphors are investigated. The luminous mechanism of Na 4 CaSi 3 O 9 :Ce 3+ , Sm 3+ phosphors is explained by using the energy level diagrams of Ce 3+ and Sm 3+ ions. The experimental results are beneficial to research new Ce 3+ and Sm 3+ co-doped phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Shen-wei Bai,Hui Mei,Ming-gang Zhang,Yue-kai Yan,Lai-fei Cheng,Li-tong Zhang
In this article, a 3D photocatalytic support with different Poisson’s ratio was used for the first time to control the photocatalytic production rate of hydrogen. It was created by a stereo-lithography method, and the support with the most negative Poisson’s ratio got the best result. The Poisson’s ratio of the 3D structure influences the rate of hydrogen production , and it is important for the photocatalyst supports to be porous for light to penetrate into them. A series of Ce doped CdS photocatalysts were produced and immobilized on 3D multicellular Al 2 O 3 supports. By changing the proportion of Ce 3+ doped into the CdS photocatalysts 1 % of Ce 3+ exhibited optimal hydrogen production, which was 222.9 % compared to that of the pure CdS. Using the 3D photocatalytic support with different Poisson’s ratio, the photocatalytic production rate of hydrogen increased by 128 %.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Huancheng Wu,Chaowei Yang,Xuejie Zhang,Bingfu Lei,Mingtao Zheng,Haoran Zhang
In this paper, a series of Ba2GaB4O9Cl:Ce 3+ ,Tb 3+ phosphors were synthesized by the conventional high-temperature solid-state reaction. The incorporation of Ce 3+ ions as sensitizers significantly enhances the absorption and luminescence intensity of Tb 3+ ions in the Ba 2 GaB 4 O 9 Cl phosphor. The energy transfer from Ce 3+ to Tb 3+ occurs through the electric quadrupole-quadrupole interaction, with an energy transfer efficiency of 48 %. The internal quantum efficiency of Ba 2 GaB 4 O 9 Cl:Ce 3+ ,Tb 3+ phosphor is 39.95 % upon 316 nm excitation. At 423 K, the emission intensity of Ba 2 GaB 4 O 9 Cl:Ce 3+ ,Tb 3+ can keep 53.28 % of its initial value at room temperature. All these results indicate that the Ba 2 GaB 4 O 9 Cl:Ce 3+ ,Tb 3+ phosphor has potential application for white LED.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 28
·15587-15594
·
IF 2.936
Baochen Wang,Yangai Liu,Zhaohui Huang,Minghao Fang
This study mainly reports an investigation about the crystal structure and photoluminescence properties of a Ce3+ doped alkaline earth metal silicate Sr3MgSi2O8. X-ray powder diffraction (XRD) and structure refinement methods are adopted to characterize the phase composition and crystal structure. The excitation/emission spectra and diffuse reflection spectra (DRS) of the title phosphor are measured and the mechanism of concentration quenching as well as thermal quenching are discussed in detail. Results show that the concentration quenching in Sr3MgSi2O8 is due to dipole–dipole interaction energy transfer between Ce3+ ions. The title phosphor has an excellent thermal stability with 90% emission intensity reserve when the temperature rises to 150 °C. The related mechanism is considered to be the thermal ionization effect and an energy level diagram was proposed to show the thermal ionization process.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 6
·3869-3876
·
IF 1.774
Cao Renping,Jiao Yuming,Wang Xuantian,Ouyang Xun,Chen Ting,Wan Huijun,Fan Ting,Xie Shikun
In this work, CaTiSiO 5 :Ce 3+ and CaTiSiO 5 :Ce 3+ , Mn 2+ phosphors are prepared in air via the high-temperature solid-state reaction method. The crystal structure, phase purity, and luminescence properties of the samples are investigated. CaTiSiO 5 :Ce 3+ phosphor under excitation at 320 nm emits mazarine light with chromaticity coordinates (0.1693, 0.0053) and optimal Ce 3+ doping concentration of ∼ 6 mol.%. CaTiSiO 5 :6%Ce 3+ , Mn 2+ phosphor with excitation at 320 nm shows a tunable color emission from yellow to red-orange with increasing Mn 2+ concentration from 1 mol.% to 8 mol.%, the corresponding chromaticity coordinates are changed from (0.4302, 0.4507) to (0.5475, 0.3916), and the corresponding lifetimes decrease from 34.22 ns to 16.33 ns. The energy transfer (ET) process between Ce 3+ and Mn 2+ ions is confirmed by the spectral properties and lifetimes of CaTiSiO 5 :6%Ce 3+ , Mn 2+ phosphor, with ET efficiency reaching ∼ 52.28%. The luminescence mechanism is explained by the energy level diagrams of Ce 3+ and Mn 2+ ions. The experimental results are of benefit for research and improving the tunable emission of other phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Qijie Xiong,Chun Liu,Wensheng Li,Zhenggang Zou,Yijian Sun,Jinsheng Liao,Herui Wen,Guoliang Gong
The La 3 Ga 5 SiO 14 is a representative electro-optical material (A 3 BC 3 D 2 O 14 , P 321) with disordered C and D sites. Theoretically, composition adjustment from La 3 Ga 5 SiO 14 to La 2 SrGa 4 Si 2 O 14 can achieve shifting the disordered parts from double Ga, Si sites to the sole La site. In this study, Ce 3+ doped isomorphic La 2 SrGa 4 Si 2 O 14 (LSGS) phosphors with a more compact and ordered lattice than La 3 Ga 5 SiO 14 are prepared. The LSGS:Ce 3+ samples show narrow purple-blue emission around 395 nm with higher quantum efficiency than that of the La 3 Ga 5 SiO 14 :Ce 3+ . The LSGS:1.2 %Ce 3+ exhibits highest fluorescence intensity with decaying lifetime of sub-10 ns The large Stokes shift reduces the overlap of the absorption and emission bands. The structural defects reflected by X-ray induced fluorescence is discussed. The potential of LSGS:Ce 3+ as a kind of scintillator is preliminarily evaluated.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Feng Zhang,Dazhao Wang,Guanxin Du,Hongwei Li,Dianhao Hou,Yankun Qi,Shichao Lv,Shifeng Zhou
The scintillating photonic glass has the great potential for medicine imaging, nuclear physics, high-energy physics, and national defense. However, the development of the candidate with the high density remains a significant challenge. Herein, the superdense scintillating glasses derived from the Ce 3+ -activated Lu 2 O 3 -SiO 2 binary system were successfully fabricated by the strategy of contactless aerodynamic levitation heating under the N 2 atmosphere. These glasses are colorless, optical homogeneous, and exhibit superdense density from 6.59 to 7.15 g/cm 3 , representing the highest density among the fast decay glass systems. The materials present excellent radiation-blocking ability, suitable emission wavelength, and fast response, indicating the promise for fast-event X-ray detection. The micro radiation probe was fabricated by connecting the scintillating glass and the optical fiber. The practical application in remote radiation detection is demonstrated and it exhibits excellent linear response and high signal-to-noise ratio. The results confirm that the fabricated superdense scintillating glass is promising for application in the field of high-energy radiation detection.
研究领域:
材料科学
·
核物理学
·
医学成像
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）