Chemosensors
·
2022
·Vol. 10
·期 12
·533
·
IF 4.229
Nihui Huang,Guojun Lu,Bihai Bai,Zijun Chen,Min Zhang,Yuechan Li,Chunyan Cao,An Xie
Tungstate and molybdate phosphors have received great attention for their excellent photoluminescent properties and thermal stabilities. In the article, Tb3+-activated tungstate and molybdate green phosphors were prepared by a solid-state reaction method at different caline temperatures and were compared and studied. The crystal structures and the morphologies of samples were characterized by X-ray diffraction (XRD) patterns and field emission scanning electron microscopy (FE-SEM) images. The energy-dispersive spectra (EDS) proved the compositions of the prepared samples. The photoluminescence (PL) spectra showed that the PL excitation spectra of Tb3+-doped Lu2W3O12and Lu2Mo3O12green phosphors consisted of a broad and strong charge transfer band (CTB) and 4f–5d transitions of Tb3+in the ultraviolet (UV) wavelength range and some narrowed excitation peaks from the 4f–4f transition of Tb3+in the near ultraviolet (NUV) wavelength region. The PL emission spectra of the phosphors exhibited the characteristic green emissions owing to the5D4→7F5transition of Tb3+located at about 547 nm. The values of energy gapEgwere calculated based on the diffuse reflection spectra (DRS). The measuring temperature-dependent PL spectra illustrated the thermal stabilities of phosphors. The Tb3+-doped Lu2Mo3O12phosphor presented normal thermal quenching phenomena and the values of the thermal activation energyEawere calculated based on the measuring temperature dependent PL emission spectra. The Tb3+-doped Lu2W3O12phosphor exhibited abnormal thermal enhancing CTB excitation intensity at about 170 °C. Furthermore, the PL decay curves suggested that the lifetime corresponding to the5D4level of Tb3+in the Lu2W3O12host lattice was longer than that in the Lu2Mo3O12host lattice. Compared the Tb3+-doped Lu2Mo3O12phosphor, the Tb3+-doped Lu2W3O12phosphor has shown potential as an application in temperature sensors.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Feiyan Xie,Junqiang Gu,Shengqian Wang,Shengliang Zhong,Hualan Xu,Junhao Li
Phosphors for white light-emitting diodes (WLEDs) would suffer from inadequate luminescent thermal stability, especially at high temperatures, affecting both the reliability and lifespan of devices. Thus, the development of phosphors with excellent thermal stability is a crucial task. By use of a high-temperature solid-state reaction method, a series of Tb3+ and Eu3+ codoped NaGd2Ga3Ge2O12 (abbreviated as NGGGO) phosphors has been successfully synthesized. With an appropriate doping concentration of Tb3+ and Eu3+, the NGGGO:Tb3+,Eu3+ phosphors can provide color tunable emissions; simultaneously, the energy transfer (ET) efficiency from Tb3+ to Eu3+ can reach nearly 100%. Notably, high-concentration Tb3+ doping in NGGGO could induce oxygen vacancies, giving significant enhancement on the thermal stability of Eu3+ luminescence. For the NGGGO:60% Tb3+,1.6% Eu3+ phosphor, the emission intensity of Eu3+ at 450 K remained even higher than that observed under room-temperature conditions. By use of the as-synthesized phosphor as a red emission converter, a near-ultraviolet pumped WLED device can be fabricated. Under a driving current of 20 mA, the device exhibits high color rendering index (CRI) ∼ 89, low correlated color temperature (CCT) ∼ 4603 K, and bright white light with CIE chromaticity coordinates of (0.3569, 0.3587), which demonstrates the potential of NGGGO:Tb3+,Eu3+ phosphors in WLED application.
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
JAPANESE JOURNAL OF APPLIED PHYSICS
·
2022
·Vol. 61
·期 6
·062002
·
IF 1.491
Lei Wang,Subiyinuer Jilili,Ayinuremu Tuerxun,Aierken Sidike,Qingling Wang
A series of Tb3+, Eu3+, Li+ co-doped SrSiO3 phosphors were prepared using the high-temperature solid-phase method. The X-ray diffraction results showed that Tb3+ and Eu3+ successfully entered into the SrSiO3 matrix lattice. Strong energy transfer from Tb3+ to Eu3+ is exhibited with a calculated energy transfer efficiency of 94.7%. Doping of the charge compensator Li+ increased the luminescence intensity of the SrSiO3:6%Tb3+, 6%Eu3+, 3%Li+ phosphor at a wavelength of 614 nm by 4.2 times and significantly improved the color purity of this phosphor (Cp = 85.9%). Based on color coordinate analysis, the phosphor color coordinates are located near (0.615, 0.365), which belongs to the red region. The phosphor was integrated into a white LED. The resultant package exhibited a color temperature of 6479 K and a color rendering index of 93.8. Its luminous performance was also very stable under different drive currents.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 4
·2548-2554
·
IF 3.094
Zhigang Zheng,Ye Tong,Rongfei Wei,Fangfang Hu,Xinyuan Sun,Hai Guo
Commercial Bi 4 Ge 3 O 12 (BGO) monocrystal scintillator is relatively complicated to produce and too expensive. Therefore, it is desired to look for alternative scintillating materials with simple process, low consumption, large size, and high efficiency. Here, glass-ceramics (GC) with high volume fraction of crystal phase and high density by increasing the proportion of heavy metal fluorides in the composition were designed. And bulk Tb 3+ -doped transparent BaGdF 5 glass-ceramics with 23.3% crystal volume ratio and density of 4.65 g/cm 3 have been prepared. The structural, optical, and luminescent properties of precursor glass and GC were systematically explored through series of characterization techniques including X-ray diffraction (XRD), transmittance spectra, transmission electron microscope (TEM), photoluminescence (PL) spectra, and X-ray excited luminescence (XEL). After heat treatment, both PL emission and XEL intensity of GC are enhanced because of the movement of Tb 3+ ions from the amorphous glass matrix into BaGdF 5 nanocrystals, which possess lower phonon energy and better crystal field. The luminescent quantum efficiency of GC reaches 30.7% and the XEL intensity of GC is around 140% of that of the commercial BGO scintillating crystal. Our results demonstrate that BaGdF 5 :Tb 3+ GC may act as efficient scintillator for X-ray detection.
研究领域:
材料科学
·
光学
·
医学影像
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 8
·1-5
·
IF 2.983
Liu Biaojie,Yang Guoren,Meng Xianwei,Si Yunfei
Thermal stability is the main problem affecting the application of inorganic fluorescent materials in high-power LED devices. Here, we have synthesized a green light-emitting phosphor Na 2 Ca 1-x Ge 6 O 14 : xTb 3+ with high luminescence thermal stability mainly through high temperature solid-state reaction. By changing the concentration of doping ions, the traps concentration of the material can be increased, so that the thermal stability of the material can be improved, which is attributed to the traps compensating greater than the thermal quenching effect. This method of utilizing traps to improve thermal stability provides a potential synthesis strategy for improving high-power white LED used in automotive.
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
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 16
·4022-4029
·
IF 7.779
Peng Zhang,Wanying Xie,Zhenbin Wang,Zenggang Lin,Xiuxiang Huang,Zhenghua Ju,Weisheng Liu
Long-persistent luminescence (PersL) materials have shown great promise on account of their diverse utilization in anticounterfeiting and encryption. Nevertheless, time-dependent dynamic multicolor afterglow is rarely reported, especially for single-component oxide-based materials. In this work, a series of LiGa5O8:Eu3+/Tb3+ phosphors exhibit time-dependent dynamic multicolor afterglow from blue to red or green over several seconds after ceasing the excitation. Both experimental and computational data confirm that the color evolution results from different energy transfer processes between traps and luminescent centers. The processes are probably controlled by thermally activated exciton diffusion and the electron tunneling effect. This dynamic multicolor afterglow of LiGa5O8 phosphors allows their applications in anticounterfeiting and encryption with high security levels.
研究领域:
材料科学
·
光学
·
加密技术
·
防伪技术
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 26
·3657-3665
·
IF 3.304
G. Q. Wang,L. Y. Li,Y. N. Feng,H. Yu,X. H. Zheng
In this study, a novel dual-mode luminescence phosphor KBaLu(MoO4)3:Tb3+,Yb3+ has been synthesized by high-temperature solid-state reactions, and the crystal structures have been determined for the first time. Single-crystal X-ray diffraction data reveal that its space groups are C2/c. The crystalline structure is constituted by K/BaO8 distorted square antiprisms, distorted LuO8 polyhedra and two kinds of distorted MoO4 tetrahedra, which form chains lying along the c-axis. Spectroscopic properties and energy transfer mechanisms are investigated by detailed analyses of emission and excitation spectra and excited-state lifetimes. The KBaLu(MoO4)3:Tb3+,Yb3+ phosphor shows dominant green emissions in the visible region, which are due to 5D4 → 7F5 transition of Tb3+ under excitation light in ultraviolet region as well as a 980 nm laser, and the CIE coordinates are close to the Society of Motion Picture and Television Engineers (SMPTE) standard values for primary green (0.310, 0.595). With the increasing temperature, the luminescence of KBaLu(MoO4)3:Tb3+,Yb3+ phosphor decreases almost linearly with the CIE coordinate variation from (0.326, 0.616) to (0.327, 0.530), which results in photoluminescence color variation from primary green to yellowish-green. The present results demonstrate the successful synthesis of a dual-mode luminescence material KBaLu(MoO4)3:Tb3+,Yb3+ phosphor with both up- and down-conversion luminescence properties; moreover, it can be used as a potential spectrum converter in display lighting and anti-counterfeiting.
研究领域:
光学材料
·
固体化学
·
发光材料
·
晶体学
·
光谱学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Hangtao Ye,Qin Wang,Ziyao He,Yao Tong,Wei Xia,Hongbin Fan,Weidong Xiang,Xiaojuan Liang
In recent years, silicon (Si) photodetectors (PDs) have been widely used in daily life, but the ultraviolet (UV) region response is extremely low, while perovskite nanocrystals (NCs) can be used as a light conversion layer to effectively improve the UV region detection performance due to their high absorption coefficient. At the same time, embedding NCs into a glass matrix can protect NCs from the adverse external environment, which can greatly prolong the effective working time of the detector. In this work, a series of perovskite NC glasses (PNGs) with intrinsic emission but still maintaining high transmittance were fabricated successfully by regulating the concentration of CsPbCl2Br1 NCs. Furthermore, the rare-earth ion Tb3+ was successfully introduced into CsPbCl2Br1 NCs, achieving energy transfer of the exciton to Tb3+, and the photoluminescence quantum yield (PLQY) had a big boost from 11.1 to 28.1%. In the end, the prepared CsPbCl2Br1:Tb3+ PNG was first integrated with Si PDs, and the UV responsibility of Si PDs was enhanced due to the absorption of CsPbCl2Br1 PNG doped with Tb3+ in the UV region. At 320 nm, the responsivity of Tb3+-doped CsPbCl2Br1 PG-Si PDs is significantly higher than that of bare Si PDs. In addition, CsPbCl2Br1:Tb3+ PNG-Si PDs maintained excellent photocurrent stability. The CsPbCl2Br1:Tb3+ PNGs are expected to be one of the optimum semiconductor materials for next-generation high-performance UV PDs.
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
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 43
·15433-15442
·
IF 4.174
Yini Mao,Zhiyi Wang,Rui Ye,Li Jiang,Shanshan Hu,Jun Yang
Octahedral [CaY]F2 crystals with an average particle size of 1 μm were synthesized via a mild one-step hydrothermal route without employing any surfactants. Various morphologies, including cubes, truncated cubes, truncated octahedrons, and spheres, were achieved via manipulating the amount of EDTA used, and a possible growth mechanism was proposed based on the surface energies of different crystal planes and the influence of the surfactant. XRD, SEM, EDS, TEM, HRTEM, and PL analysis were used to characterize the products. The effects of the morphologies and Li+ doping concentrations on the luminescence intensities of the [CaY]F2:Ce3+/Tb3+ phosphors were explored, and the strongest luminescence intensity is obtained when the sample is cubic with (100) crystal faces and the doping concentration of Li+ is 0.25 mol%. Additionally, multicolor emission (blue → aquamarine blue → green) was obtained from [CaY]F2:Ce3+/Tb3+ phosphors via adjusting the doping concentration of Tb3+, which resulted from the Ce3+ → Tb3+ energy transfer behavior; the energy transfer here happened through a dipole–dipole mechanism. This work may result in the as-synthesized phosphors having great application potential in many optoelectronic device fields, such as in displays and multicolor lighting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 7
·1-10
·
IF 2.8
Gong Guoliang,Liu Chun,Zhu Jiawei,Huang Guojun,Zhang Tianyong
Compounds with crystallization and vitrification capabilities can achieve more uniform grains with higher crystalline density after glass crystallization, improving the fluorescence properties of glass ceramics (GCs). In this work, a series of Tb 3+ -doped SrLa 2 Ga 4 Si 2 O 14 glasses and glass ceramics were prepared through traditional melt quenching and thermal treatment. The glass exhibits good transmittance and a sharp exothermic peak at 961 ºC. The photoluminescence and radioluminescence properties were studied in detail, and the Tb 3+ aggregation in glass and GC was discussed. Compared with the glasses, the opaque GCs show inferior fluorescence properties but better X-ray irradiated fluorescence, about 10% of the integrated emission intensity of the commercial BGO scintillation crystal. More precise processing in glass–ceramics towards homogeneous crystallization and good transmittance need to be addressed, and a promising scintillator with improved scintillating performance can be expected.
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
·
2024
·
IF 3.3
Yiying Zhu,Yining Wang,Yixin Sun,Zheng Xu,Mengmeng Shang
Lead-free double perovskites (LFDPs) usually exhibit poor luminescent performance, and doping lanthanide ions (Ln 3+ ) presents a promising solution to solve this problem. However, most Ln 3+ ions face difficulties in incorporating into LFDPs due to the mismatch in radius or valence state. Here, we successfully synthesized rare-earth (RE 3+ ) based Cs 2 NaLuCl 6 (CNLC) LFDPs and achieved efficient green emission through doping Tb 3+ into CNLC. Introducing Sb 3+ improves the absorption efficiency of CNLC: Tb 3+ from 25.1 % to 73.5 % by establishing an energy transfer channel from Sb 3+ to Tb 3+ . Benefiting from the energy transfer, the CNLC: 0.01Sb 3+ , 0.10Tb 3+ phosphor produces blue-green dual emissions, highlighting its potential in white light-emitting diodes (WLEDs). In addition, an anti-counterfeiting pattern composed of CNLC: Sb 3+ , CNLC: Tb 3+ , and CNLC: Sb 3+ , Tb 3+ samples was fabricated, which shows their promising prospect in anti-counterfeiting applications.
研究领域:
材料科学
·
光学
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 36
·12958-12967
·
IF 4
Jiejun Pan,Guang Xu,Sixue Ren,Tingjie Xu,Dongrui Li,Mengxin Liu,Xinan Shi,Daocheng Pan
Rare earth-doped metal oxide thin films exhibit remarkable potential for application in anti-counterfeiting, owing to their exceptional fluorescent properties. However, the existing fabrication techniques for these rare earth-doped luminescent thin films are predominantly complex and necessitate high-temperature conditions. In light of this issue, we present a low-temperature method for in situ fabrication of luminescent Ca1−xMoO4:Eux3+ and Sr1−xMoO4:Tbx3+ nanocrystal thin films by a solution deposition process. The developed method has the advantages of simple operation, rapid and low-temperature synthesis. The optimal chemical compositions of molybdate-based luminescent films are Ca0.90MoO4:Eu0.103+ and Sr0.90MoO4:Tb0.103+. Moreover, we evaluate the practical feasibility of luminescent nanoparticle films in the field of anti-counterfeiting by combining the unique fluorescent properties of rare earth ions and designing customized fluorescent patterns.
研究领域:
材料科学
·
纳米技术
·
光学
·
防伪技术
✓ 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）