JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 4
·1822-1831
·
IF 2.956
WeiHui Song,XueYan Chen,LiMing Teng,ZhiGang Zheng,Jun Wen,FangFang Hu,RongFei Wei,LiPing Chen,Hai Guo
Single-composition Ba 2 Y 2 Si 4 O 13 :Bi 3+ ,Eu 3+ (BYSO:Bi 3+ ,Eu 3+ ) phosphors with color-tunable and white emission were prepared by conventional high temperature solid-state reaction method. The structural and luminescent properties of these phosphors were thoroughly investigated through X-ray diffraction, photoluminescence, and decay curves. BYSO:Bi 3+ phosphors show two excitation peaks at 342 and 373 nm, and give two emission peaks at 414 and 503 nm, respectively, indicating that there are two sites of Bi 3+ in BYSO. The energy transfer from Bi 3+ to Eu 3+ was investigated in detail. Varied hues from blue (chromaticity coordinate [0.219, 0.350]) to white (0.288, 0.350) and orange-red light (0.644, 0.341) can be generated by adjusting the content of Eu 3+ . Pure white light emission (0.311, 0.338) can be obtained under the excitation of 355 nm in BYSO:3%Bi 3+ ,20%Eu 3+ phosphor. Besides, BYSO:Bi 3+ ,Eu 3+ phosphors exhibit distinct thermal quenching properties, whose emission intensity at 473 K is 82.6% of that at 298 K. Our results indicate that BYSO:Bi 3+ ,Eu 3+ may be applied as conversion phosphors for n-UV-based W-LEDs.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 8
·8094-8099
·
IF 1.798
Cao Renping,Peng Dedong,Fu Ting,Luo Zhiyang,Zhou Shenlin,Jiang Shenhua,Fu Jingwei
KSrVO 4 :Eu 3+ phosphors are synthesized by solid-state reaction method in air. Host KSrVO 4 under excitation at 345 nm emits green–yellow light with the CIE chromaticity coordinates (0.3466, 0.4425), and its broad emission band peaking at ~545 nm covers the range 400–750 nm due to 3 T 1,2 → 1 A 1 transitions in [VO 4 ] 3− group. KSrVO 4 :Eu 3+ phosphor under excitation at 315 and 394 nm shows red emission with the CIE chromaticity coordinates (0.6279, 0.3717), and the emission spectra in the range of 560–750 nm contains four narrow emission bands owing to 5 D 0 → 7 F
J
( J = 1, 2, 3, and 4) transitions of Eu 3+ ion, respectively. The optimal Eu 3+ doping concentration is ~4 mol%. The lifetime decreases from 0.991 to 0.893 ms with increasing Eu 3+ concentration within the range 0.5–6 mol%. The possible luminous mechanism is analyzed by the simplified energy level diagrams of VO 4
3− group and Eu 3+ ion, and energy transfer process in KSrVO 4 :Eu 3+ phosphor. The experimental results indicate that KSrVO 4 :Eu 3+ phosphor will be possible to be used as red phosphor candidate for white light-emitting diode (LED) based on ultraviolet (~315 nm) and near ultraviolet (~395 nm) LED chips.
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SOLID STATE SCIENCES
·
2016
·
IF 2.041
Yinyan Li,Shiqing Xu
Uniform and well-defined Lu 2 O 3 and Lu 2 O 3 :Eu 3+ microarchitectures have been successfully synthesized via a green and facile ionic liquid-based hydrothermal method followed by a subsequent calcination process. Novel 3D micro-rodbundles and 1D microrods of Lu 2 O 3 and Lu 2 O 3 :Eu 3+ were controllably obtained through this method. X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy and photoluminescence spectra were used to characterize the micromaterials. The proposed formation mechanisms have been investigated on the basis of a series of SEM studies of the products obtained at different hydrothermal durations. The results indicated that hydrothermal temperature and the ionic liquid-tetrabutylammonium hydroxide were two key factors for the formation as well as the morphology control of the Lu 2 O 3 and Lu 2 O 3 :Eu 3+ microarchitectures.
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OPTIK
·
2016
·
IF 0.742
Renping Cao,Xiangfeng Ceng,Jijun Huang,Chunyan Cao,Pengjie Tang,Hui Ao,Xiaoguang Yu
Novel Ca 0.2 Zr 0.8 O 1.8 :Eu 3+ phosphor is synthesized by high-temperature solid-state reaction method in air. Host Ca 0.2 Zr 0.8 O 1.8 with excitation 310 nm shows deep-blue broadband emission within the range 340–500 nm owing to the Zr 4+ → O 2− transition in [ZrO 8 ] group. Ca 0.2 Zr 0.8 O 1.8 :Eu 3+ phosphor with excitation 263 and 394 nm emits reddish-orange light owing to the 5 D 0 → 7 F J ( J = 1, 2, 3, and 4) transitions of Eu 3+ ion, and that with excitation 310 nm shows a systematically varied hue from deep-blue to reddish-orange by changing Eu 3+ ion concentration . Tunable emission and energy transfer are confirmed via spectral properties. The optimal Eu 3+ concentration is ∼5 mol% in Ca 0.2 Zr 0.8 O 1.8 :Eu 3+ phosphor and the corresponding fluorescence lifetime is ∼1.994 ms. The luminous mechanism is analyzed and explained by the simplified energy level diagrams of [ZrO 8 ] group and Eu 3+ ion in Ca 0.2 Zr 0.8 O 1.8 :Eu 3+ phosphor.
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OPTICAL MATERIALS
·
2015
·
IF 1.981
Xinzhi Wang,Jianguo Tang,Qingsong Xu,Wenfei Shen,Yao Wang,Jixian Liu,Yanxin Wang,Linjun Huang,Jiqing Jiao,Die Wang,Yan Song,Laurence A. Belfiore
A novel method to prepare fluorescent polymeric aggregates via Eu 3+ -induced self-assembly is described in this research contribution. The amphiphilic polymeric ligand, polystyrene-block-poly(N-vinylpyrrolidone) (PS-b-PNVP) was synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. Eu 3+ ions that function as coordination crosslinking agents were added to the reactive solution to induce self-assembly within the PNVP block. Eu 3+ ions preferentially coordinate to PNVP segments, yielding coordinatively cross-linked networks with reduced solubility in the solvent. Polystyrene segments retain their solubility in solution due to the amphiphilic character of the block copolymer. Mechanisms for self-assembly and reversible network formation are discussed. Due to the unique optical properties of Eu 3+ ions, in-depth analysis of fluorescent data was performed. These aggregates were drip-coated onto the surface of silicon wafers, with subsequent investigation of polymer morphology near the interface with silicon. This represents the initial step in the development of opto-electronic and photovoltaic applications for these self-assembled fluorescent polymeric aggregates.
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JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 50
·期 12
·4405-4411
·
IF 2.371
Yang Jinyu,Jia Xiaohui,Zeng Xiaodao,Zhu Liping,Chen Zhuo
Pure phase of LaP 3 O 9 Eu 3+ phosphors with orthorhombic structure was successfully synthesized by a polyacrylamide gel process. The crystal structure, thermal behavior, and optical properties of the as-synthesized samples were investigated by XRD, TG-DTA, FT-IR, and PL. The effects of some synthesis conditions on the structure and properties of samples were also discussed. The results reveal that the annealing temperature and the ratio of (La+Eu) to P in precursor solutions play a key role in determining the structure and luminescence properties of products. The single-phase orthorhombic structure LaP 3 O 9 :Eu 3+ phosphors can be obtained by annealing at 750–850 °C. The LaP 3 O 9 :Eu 3+ phosphors emit a dominating and intense line at 618 nm, and exhibit improved photoluminescence properties compared with the samples of LaPO 4 :Eu 3+ crystals. The concentration quenching effect can be observed with increasing Eu 3+ concentration over 40 at.%.
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Journal of Nanomaterials
·
2013
·
IF 1.547
Lijun Luo,Fenfen Hu,Li Xiong,Xiaofan Li,Meili Zhou,Zhengliang Wang
A series of red phosphors Y2O3:Eu3+ were prepared by the molten salt method with different surfactants. Their structures, morphologies, and the photoluminescent properties were investigated at room temperature. The particles size of Y2O3:Eu3+ can be controlled by adjusting the kinds of surfactants. The phosphor Y2O3:Eu3+ prepared with NP-10 [polyoxyethylene (10) nonyl phenyl ether] shows regular morphology and higher crystallinity, and its average particle size is about 200 nm. Bright red light can be observed by naked eyes from the red phosphor under 254 nm excitation.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Jingyi He,Shimin Liu,Jianmin Gu,Shiqing Xu
All-inorganic lead halide perovskite quantum dots (CsPbX3 QDs, X = Cl, Br, I) glass has elicited extensive attention due to its excellent stability. However, the realization of CsPbX3 QDs glasses with a high photoluminescence quantum yield (PLQY) remains a challenging task. In this study, Eu3+ ions act as nucleating agents to promote the formation and crystallization of CsPbBr3 QDs. Rb+ ions further improve the crystallization quality and reduce the defects between CsPbBr3 QDs and the glass interface. The codoping of Eu3+ and Rb+ ions greatly improved the PLQY of CsPbBr3 QDs. The highest PLQY is achieved in the 0.33Rb-2Eu heat-treated at 500 °C–6 h, reaching 54%. Furthermore, among the light-emitting diodes (LEDs) prepared with 1Cs-0Eu, 1Cs-2Eu, or 0.33Rb-2Eu, 0.33Rb-2Eu has the highest color gamut coverage (108.9% of the National Television Standards Committee color gamut and 92.7% of Rec. 2020 color gamut at 20 mA) and the strongest durable high-power driving capability, making it an ideal material for green LEDs.
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Journal of Physical Chemistry C
·
2012
·
IF 4.805
Hongliang Tan,Baoxia Liu,Yang Chen
The metal–organic coordination polymer has emerged as a new family of functional nanomaterials. In this work, we prepared a luminescence coordination polymer based on spontaneous self-assembling of nucleotide (AMP) and Eu3+ ions in aqueous solution. After antenna ligand tetracycline (Tc) was introduced to the coordination polymer (AMP/Eu), a strong europium luminescence was observed due to the intramolecular energy transfer from tetracycline to Eu3+. Because of the hydrophobic environment of the polymer interior, the luminescence intensity of AMP/Eu incorporated tetracycline (AMP/Eu–Tc) was 30 times higher than that of AMP/Eu in a solution containing the same amount of tetracycline. AMP/Eu–Tc displays a long emission lifetime, excellent dispersion, and stability in aqueous solution. The coordination polymers based on antenna ligands possess great potential in the applications of ultrasensitive time-resolved fluorometric assays and biological imaging.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Linfang Ma,Yanan Li,Xiaoyi Liu,Shengda Liu,Guixia Liu,Dan Li,Jinxian Wang,Wensheng Yu,Xiangting Dong
The self-activated and rare earth Dy 3+ and Eu 3+ ions doped Na 2 YMg 2 V 3 O 12 phosphors with single garnet structure were obtained by using solid state reaction method. Self-activated Na 2 YMg 2 V 3 O 12 phosphors have a wide excitation band in near-ultraviolet range, Dy 3+ and Eu 3+ ions were co-doped in Na 2 YMg 2 V 3 O 12 host to broaden the excitation peak range of the phosphors. Using 365 nm near-ultraviolet light as the excitation wavelength, Na 2 YMg 2 V 3 O 12 :Dy 3+ ,Eu 3+ phosphors simultaneously emit sharp transition peaks of Dy 3+ ions at 487 nm and 576 nm, and red transition peaks of Eu 3+ at 595 nm, 611 nm and 635 nm. The energy transfer processes between VO 4 3− , Dy 3+ and Eu 3+ were discussed. The multicolor light emitting can be adjustable and white light can be realized due to the changing amount of the doped ions. Emission spectra dependent of temperature showed that Na 2 YMg 2 V 3 O 12 :Dy 3+ , Eu 3+ phosphors had good thermal quenching performance, indicating that the phosphors can be used in the field of near ultraviolet excited WLED.
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JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Yutian Zhang,Lianjie Li,Junyu Chen,Hai Guo
Fluorescent thermometers based on lanthanide-doped phosphors have broad application prospect because of their quickly response, highly sensitivity, non-contact mode and widely application scenarios. However, their relative sensitivity is limited by fixed thermal coupling energy level. Herein, Ca 2 GdNbO 6 :Dy 3+ ,Eu 3+ samples possessing dual-emission centers were fabricated as fluorescence thermometers based non-thermal coupling energy level. When excited by 393.5 nm, the characteristic emissions from Dy 3+ and Eu 3+ in CGNO:Dy 3+ ,Eu 3+ can be simultaneously detected. Furthermore, CGNO:Dy 3+ ,Eu 3+ phosphors exhibit excellent temperature sensing performance in fluorescence intensity (FI) relied on Eu 3+ and fluorescence intensity ratio (FIR) relied on dual-emission centers. The maximum relative sensitivities ( S Rmax ) reach 1.61 %K −1 at 426 K for FI at 703 nm, 1.01 %K −1 at 391 K for FIR of FI at 616 nm and FI at 576 nm, and 2.18 %K −1 at 501 K for FIR of FI at 703 nm and FI at 576 nm, respectively. These findings demonstrate that Ca 2 GdNbO 6 :Dy 3+ ,Eu 3+ samples are prime candidates for fluorescent thermometers.
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CURRENT APPLIED PHYSICS
·
2025
·
IF 3.1
Xiangyuan Duan,Shuyan Xu
Fluorescent composite films were prepared using polyvinyl alcohol (PVA) as the substrate and NaYF 4 :Eu 3+ phosphors and κ-carrageenan powder (KC) as the fillers by the casting method. The impact of incorporating NaYF 4 :Eu 3+ on the structural, morphological, mechanical property, thermal stability, and optical characteristics of PVA/KC films was examined. The incorporation of KC promoted the formation of hydrogen bonds between KC and PVA. Consequently, the water contact angle of the films increased by approximately 10°, indicating improved water resistance. Meanwhile, the incorporation of NaYF 4 :Eu 3+ increased the thermal stability of the films, with the temperature at 5% mass loss rising by approximately 13°C. Additionally, the mass retention at 600°C improved by 3.47%. Notably, the addition of NaYF 4 :Eu 3+ had a negligible effect on the transparency of the films while imparting fluorescent properties. Under UV excitation at 395 nm, the films exhibited maximum fluorescence intensity at 616 nm, indicating a significant fluorescence effect.
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