MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Renping Cao,Yongtong Rong,Yewen Cao,Ban Lan,Chenxing Liao,Jingheng Nie,Fangrui Cheng,Jing Wang
Now free rare earth ions doped materials have attracted a lot of attention. In this work, CaNb 2 O 6 :Mn 2+ with a pure phase is synthesized by solid-state method in the reducing atmosphere. The crystal structure and luminescence properties of host (CaNb 2 O 6 ) and CaNb 2 O 6 :Mn 2+ are investigated. Host (CaNb 2 O 6 ) under excitation ultraviolet (UV) light emits blue light. CaNb 2 O 6 :Mn 2+ can show tunable emission from blue to white. Under excitation 260 nm, blue emission of CaNb 2 O 6 :Mn 2+ is observed owing to the 4 T 1 ( 4 G) → 6 A 1 ( 6 S) transition of Mn 2+ . When the excitation wavelength is 314 nm, CaNb 2 O 6 :Mn 2+ emits white light due to the 4 T 1 ( 4 G) → 6 A 1 ( 6 S) transition of Mn 2+ and the 6 A 1 (6S) 4 T 1 (4G) → 6 A 1 (6S) 6 A 1 (6S) transition in Mn 2+ - Mn 2+ dimers. We measure the concentration dependent spectra of CaNb 2 O 6 :Mn 2+ and make sure the optimal Mn 2+ doping concentration (∼0.8 mol%). We infer that the concentration quenching mechanism is the electric multipolar interaction between nearest-neighbor ions. Based on the temperature dependent spectra of CaNb 2 O 6 :Mn 2+ , we came to the conclusion that CaNb 2 O 6 :Mn 2+ has a good thermal stability. We analyze the concentration and thermal quenching mechanisms and explain the luminous mechanism by the Tanabe-Sugano energy level diagram of Mn 2+ ion. This research results provide a framework for creating Mn 2+ -doped luminescent materials .
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 LUMINESCENCE
·
2020
·
IF 3.28
Lihong Bao,Xiaojian Pan,Hongyan Zhang,Jun Wang,Yanchun Yang,Kefu Chao,Ojiyed Tegus
A novel alkaline earth niobates red phosphor CaNb 2 O 6 :Eu 3+ have been prepared through solid-state reaction, using the nanocrystalline EuB 6 as a novel activator. The Rietveld refinement of XRD results reveal that the Eu 3+ ions substitute the lattice site of Ca 2+ ions and the B 2− ions replace the lattice site of O 2− ions, which induces the defect energy levels at the band gap of 5 D n levels and leads to higher luminescence intensity of five times higher than using the Eu 2 O 3 activator. The CIE chromaticity coordinates of Ca 0·88 Nb 2 O 6 :0.12EuB 6 phosphor were calculated to be (0.643, 0.34) and it is quite similar to that of pure red light. Moreover, this phosphor exhibits an excellent luminescence thermal stability. When the ambient temperature rises to 398 K (125 °C) and 423 K (150 °C), the integrated emission intensity remains 90% and 86% of their initial PL intensity at 300 K, respectively. Based on above mentioned, the Ca 1-x Nb 2 O 6 :xEuB 6 as a NUV-excited red phosphor have a potential application for the high-performance white LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hang Zhang,Hang Yang,Guogang Li,Shiqi Liu,Haoran Li,Yuming Gong,Yujun Liang,Yongjun Chen
Currently, phosphor materials play an important role in designing noncontact remote optical thermometers. Although many approaches have contributed to improve thermometric performance of optical thermometers including optimization of host materials, size of nanoparticles , dopant type and concentration as well as excitation density and phonon energy engineering, the development of highly sensitive optical thermometric materials is still a challenge. Hence, we developed novel CaNb 2 O 6 (CNO):Ln 3+ (Ln 3+ = Eu 3+ /Sm 3+ /Dy 3+ /Tb 3+ ) phosphors as highly thermometric materials and proposed a novel strategy for further enhancing its thermometric performance via adding the intensity of indicator signal by co-doping Bi 3+ ions in current phosphor system. Typically, the as-prepared CNO:Ln 3+ phosphors present a broad blue emission around 470 nm originated from NbO 6 octahedral groups and some respective emission lines derived from the characteristic f-f transitions of Ln 3+ ions. Based on the diverse thermal quenching performance between blue emission and Ln 3+ ions emission , the temperature sensitivities of CNO:Ln 3+ were investigated in detail. Among them, the maximum relative sensitivity of CNO:Eu 3+ sample reached 1.991% K −1 in the range of 298–448 K and remained 97% after five temperature cycles. Furthermore, an obvious discoloration was discovered during temperature cycle testing in CNO:Ln 3+ samples under 254 nm UV lamp. Through doping Bi 3+ ion, the strongest intensity of indicator signal is 24 folds that of CNO host. Correspondingly, the relative sensitivity of CNO:Bi 3+ , Eu 3+ sample is obviously improved to 3.793% K −1 in the range of 298–523 K, owing to a larger range of the FIR value and a wider drop range of indicator signal. This work opens up an effective pathway to improving thermometric performance of optical thermometers by enhancing the intensity of indicator signal of employed phosphor materials.
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
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Fan Xiulian,Yi Jiali,Deng Bin,Zhou Cong,Zhang Zejuan,Yu Jia,Li Weihan,Li Cheng,Wu Guangcheng,Zhou Xilong,Sun Tulai,Zhu Yihan,Zhou Jian,Xia Juan,Wang Zenghui,Lai Keji,Peng Zheng,Li Dong,Pan Anlian,Zhou Yu
The experimental realization of single-crystalline high-κ dielectrics beyond two-dimensional (2D) layered materials is highly desirable for nanoscale field-effect transistors (FETs). However, the scalable synthesis of 2D nonlayered high-κ insulators is currently limited by uncontrolled isotropic three-dimensional growth, hampering the achievement of simultaneous high dielectric constants and low trap densities for small film thicknesses. Herein, we show a 2D edge-seeded heteroepitaxial strategy to synthesize ultrathin nonlayered 2D CaNb 2 O 6 nanosheets by chemical vapor deposition, exhibiting high-crystalline quality, thickness-independent dielectric constant (~ 16) and breakdown field strength up to ~ 12 MV cm −1 . The MoS 2 /CaNb 2 O 6 FETs exhibit an on/off ratio of over ~ 10 7 , a subthreshold swing down to 61 mV/dec and a negligible hysteresis. This work suggests a universal 2D edge-seeded heteroepitaxy and slow kinetic strategy for the scalable growth of 2D nonlayered dielectric and demonstrates 2D CaNb 2 O 6 nanosheets as promising dielectrics for facilitating 2D electronic applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 42
·期 1
·681-687
·
IF 3.269
Yue Liu,Yansong Zhou,Chade Lv,Congmin Zhang,Xiaoli Jin,Qingqiang Meng,Gang Chen
Semiconductor 2D-composite heterostructures are of great interest in water splitting due to their unique structure. In this work, we design and synthesize 2D-composite HCa2Nb3O10/CaNb2O6 (HCNO/CNO) heterostructured nanosheets for the first time through sintering with a subsequent ion-exchange procedure. The achievement of such a 2D-composite nanostructure is attributed to the similar crystalline structure and intercalation–exfoliation of the layered bulk by employing tetra-n-butylammonium hydroxide (TBA+OH−). Furthermore, the 2D-composite structure contributes to increasing the interfacial contact area and lattice mismatch occurring in the heterostructure. Benefiting from the construction of a heterostructure and the unique structure characteristics, the as-prepared 2D-composite HCNO/CNO nanosheets exhibit rapid photoinduced charge carrier separation and transfer, leading to significantly enhanced photo-electrochemical current response as well as photocatalytic hydrogen evolution.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
BULLETIN OF MATERIALS SCIENCE
·
2016
·Vol. 39
·期 1
·187-193
·
IF 0.895
CAO RENPING,QIN ZHENGDONG,JIANG SHENHUA,LIANG AIHUI,LUO ZHIYANG,YU XIAOGUANG
A series of CaNb 2 O 6 : x Sm 3+ (0 ≤
x
≤ 10 mol%) and CaNb 2 O 6 : Sm 3+ , Na + /B 3+ phosphors were synthesized by the solid-state reaction method in air. Their crystal structures and luminescence properties were investigated and analysed, respectively. Host CaNb 2 O 6 emitted blue light with excitation 270 nm. CaNb 2 O 6 : x Sm 3+ phosphors showed a systematically varied hue from blue to white by changing Sm 3+ ion concentration from 0 to 10 mol% with excitation of 270 nm and their chromaticity coordinates were the regions from (0.1665, 0.1767) to (0.2484, 0.2260). Luminescence properties of CaNb 2 O 6 : Sm 3+ phosphor were tuned and improved significantly by codoping B 3+ or Na + ions. Energy transfer between Nb \(_{\mathbf {2}}\textit {O}_{\mathbf {6}}^{\boldsymbol {2-}}\) group and Sm 3+ ion was observed and analysed via luminescence properties. The luminous mechanism was explained by energy level scheme and energy transfer process in CaNb 2 O 6 : Sm 3+ phosphor. The strong excitation band peaking at ∼ 407 nm indicated that the CaNb 2 O 6 : Sm 3+ , Na + /B 3+ phosphor has a potential application in white light-emitting diodes based on near-UV LED chip.
研究领域:
材料科学
·
无机化学
·
发光材料
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固体物理
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光电子学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Zongjie Li,Kejie Li,Jiaqi Zhao,Dongxu Guo,Ruiying Lu,Tianqi Sheng,Zuoling Fu
Rare-earth-doped luminescent materials show great promise for noncontact temperature sensing. However, their practical implementation is often hindered by poor dopant compatibility and limited integration into flexible devices. Herein, we report a Li+-mediated structural engineering strategy that significantly enhances the dopant tolerance of a CaNb2O6 (CNO) niobate host. The incorporation of Li+ ions facilitates lattice contraction and charge compensation, enabling high-loading and homogeneous incorporation of multiple rare-earth ions (Er3+, Ho3+, Yb3+, and Nd3+) while effectively suppressing impurity formation. By strategically engineering multichannel energy transfer pathways, particularly a phonon-assisted Yb3+ → Er3+/Ho3+ sensitization network, the Yb3+-sensitized CNO: Er3+, Ho3+ system exhibits superior near-infrared II thermometric performance under 980 nm excitation, achieving a high relative sensitivity of 0.92% K–1 and a temperature resolution of 0.66 K in the biologically relevant range (313–373 K). Furthermore, the CNO: Yb3+, Er3+, Ho3+ phosphor is successfully incorporated into a flexible polydimethylsiloxane film, demonstrating stable and reliable temperature sensing in aqueous environments. A prototype bendable optical fiber sensor is also fabricated, showcasing its great potential for wearable health monitoring and biomedical thermal imaging. This work establishes a systematic paradigm from host lattice structural regulation to flexible device integration, providing a novel and generalizable strategy for advancing intelligent thermal sensing technologies.
✓ 已验证
DOI
PubMed
高影响因子
PHYSICA B-CONDENSED MATTER
·
2021
·
IF 2.436
Xiaojian Pan,Lihong Bao,Luomeng Chao,Kefu Chao,Zizhong Liu
CaNb 2 O 6 :Tb 3+ green phosphors have been successfully fabricated via the traditional solid-state synthesis, where the nanocrystalline TbB 6 is used as efficient activator. The doping effects of nanocrystalline TbB 6 on the phase composition, the microstructure and photoluminescence of as-prepared phosphors were characterized by means of Rietveld refinement XRD , FESEM and photoluminescence measurements. As a result, all the synthesized CaNb 2 O 6 :Tb 3+ phosphors are composed by the single phase of CaNb 2 O 6 . The photoluminescence (PL) spectroscopy shows that the maximum emission intensity occurred when the nanocrystalline TbB 6 doping concentration is x = 0.06. Moreover, this phosphor keep the emission intensity remains about 43.3% of 300 K when its emission temperature increase to 423 K. Additionally, the white LED is fabricated by mixing present green phosphor with commercial blue and yellow phosphors, showing a white LED with the color temperature of 5152 K. On the basis of above mentioned, Ca 0·94 Nb 2 O 6 :0.06TbB 6 phosphor can be applied as a potential green phosphor for high-performance white LED.
研究领域:
材料科学
·
光学材料
·
发光材料
·
固态化学
·
LED技术
✓ 已验证
DOI
高影响因子
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