ACS Photonics
·
2018
·
IF 6.88
Zuobin Tang,Gangyi Zhang,Yuhua Wang
A dipotassium hafnium trisilicate K2HfSi3O9 with wadeite structure was synthesized by solid-state reaction for the first time. Its detailed crystal structure and electronic structure were determined using XRD Rietveld refinement and density functional theory (DFT), respectively. An expected asymmetric emission band was observed in K2HfSi3O9:Eu2+ due to Eu2+ ions occupying the two symmetrically inequivalent K+ (K1 and K2) ion sites in the host lattice. The K2HfSi3O9:Eu2+ has obvious heat-sensitive luminescent features (25 °C, blue emission; 250 °C, green emission), which can be rationalized by the energy transfer from Eu1 to Eu2 under thermal stimulation. Moreover, we developed promising phosphor K2HfSi3O9:Eu2+,Sc3+ by employing the crystal-site engineering method, and tuned the emission color from blue to green with the variation of Sc3+ ions. The target phosphor K2HfSi3O9:2%Eu2+, 6%Sc3+ shows strong absorption in the spectral range of ∼250–490 nm and a narrow green-emitting band (fwhm ∼59 nm) peaking at ∼507 nm with zero emission loss at ambient temperature up to 200 °C. Such robust thermal performance was explained by possible transfer energy from the defect levels to the 5d band of Eu2+, and certified by the thermoluminescence spectrum and the decay curves in the temperature range of 25 to 250 °C. Combing this excellent green phosphor with n-UV (395 nm) or blue chips (450 nm), pc-WLEDs with high luminance, adequate color rendering index, and correlated color temperature were obtained.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Fengping Ruan,Degang Deng,Ming Wu,Bowen Chen,Lei Lei,Ruoshan Lei,Shiqing Xu
A novel dual-emitting Ca 8 ZrMg(PO 4 ) 6 (SiO 4 ): (Eu 3+ , Eu 2+ ) phosphors with ultrahigh-sensitive optical temperature sensing are prepared by a conventional solid-state method. The Eu 2+ /Eu 3+ co-activated Ca 8 ZrMg(PO 4 ) 6 (SiO 4 ) phosphors exhibit efficient dual-mode emissions with an intense, broad blue emission peaked at 414 nm and a relative bright red-emitting centered at 614 nm under 297 nm UV-light excitation, respectively. Furthermore, the fluorescence intensity ratio (FIR) technology is applied to analyse the optical temperature sensing performance of Ca 8 ZrMg(PO 4 ) 6 (SiO 4 ): (Eu 3+ , Eu 2+ ) phosphors. Based on different thermal quenching behavior of Eu 2+ and Eu 3+ dual-emitting centers, linear temperature-dependent FIR between Eu 2+ and Eu 3+ is obtained. The maximal absolute sensitivity reaches as high as 5.94% K −1 , which is superior to that for the other luminescent temperature sensing materials reported previously. Analyses of the temperature-dependent photoluminescence spectra and configurational coordinate diagrams for Ca 8 ZrMg(PO 4 ) 6 (SiO 4 ): (Eu 3+ , Eu 2+ ) phosphors indicate that the temperature-sensitive variation in FIR of Eu 2+ to Eu 3+ is originated from the difference in thermal quenching activation energy for 5d→4f transition of Eu 2+ and 5 D 0 → 7 F J (J = 1, 2, 4) transitions of Eu 3+ . These results reveal that the Ca 8 ZrMg(PO 4 ) 6 (SiO 4 ): (Eu 3+ , Eu 2+ ) phosphors show glorious potential in high temperature optical thermometry.
研究领域:
材料科学
·
无机化学
·
光学传感
·
功能材料
·
固体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 9
·6414-6423
·
IF 2.993
Hu Zeqing,Guo Yan,Zhang Jinghui,Zhang Yanjie
The novel Ca 4− x (PO 4 ) 2 O: xDy 3+ and Ca 4− x − y (PO 4 ) 2 O: xDy 3+ , yEu 2+ multi-color phosphors were synthesized by traditional solid-state reaction. The crystal structure, particle morphology, photoluminescence properties and energy transfer process were investigated in detail. The X-ray diffraction (XRD) results demonstrate that the products showed pure monoclinic phase of Ca 4 (PO 4 ) 2 O when x < 0.1. The scanning electron microscopy (SEM) indicated that the phosphors were grain-like morphologies with diameters of ~ 3.7–7.0 μm. Under excitation of 345 nm, Dy 3+ -doped Ca 4 (PO 4 ) 2 O phosphors showed multi-color emission bands at 410, 481 and 580 nm originated from oxygen vacancies and Dy 3+ . Interestingly, Ca 4 (PO 4 ) 2 O: Dy 3+ , Eu 2+ phosphors exhibited blue emission band at 481 nm and broad emission band from 530 to 670 nm covering green to red regions. The energy transfer process from Dy 3+ to Eu 2+ was observed for the co-doped samples, and the energy transfer efficiency reached to 60% when Eu 2+ molar concentration was 8%. In particular, warm/cool/day white light with adjustable CCT (2800–6700 K) and high CRI ( R a > 85) can be obtained by changing the Eu 2+ co-doping contents in Ca 4 (PO 4 ) 2 O: Dy 3+ , Eu 2+ phosphors. The optimized Ca 3.952 (PO 4 ) 2 O: 0.04Dy 3+ , 0.008Eu 2+ phosphor can achieve the typical white light with CCT of 4735 K and CRI of 87.
研究领域:
材料科学
·
光学材料
·
发光学
·
荧光粉化学
·
固态照明
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Chao Dou,Shengqiang Liu,Fangyi Zhao,Zhen Song,Quanlin Liu
The discovery of violet-excitable blue-emitting phosphor is a significant breakthrough for the development of phosphor-converted full-spectrum white light-emitting diodes (WLEDs). However, the application of most known violet-excitable blue-emitting phosphors is limited by their low external quantum efficiency (EQE). In this work, we reported on how the EQE values of Eu2+-doped Ba(K)-β-Al2O3 blue-emitting phosphor can be significantly improved through lattice site engineering. By partially substituting K+ for Ba2+, the Eu2+-occupied crystallographic site changes and the coordination polyhedron of Eu2+ shrinks, leading to the increase of crystal field splitting. Consequently, the excitation spectrum exhibits a continuous red shift to match the violet excitation, which enhances the PL intensity of solid solution phosphor (Ba0.4K1.6)0.84Al22O35−α:0.32Eu2+ ((B0.4K1.6)0.84AO:Eu) by 1.42 times compared to that of the end-member Ba1.68Al22O35−α:0.32Eu2+ (B1.68AO:Eu) phosphor. Correspondingly, under the 400 nm violet light excitation, the EQE of optimal blue-emitting (B0.4K1.6)0.84AO:Eu phosphor is up to 53%. Additionally, the phosphor also shows excellent resistance to luminescence thermal quenching (95% at 150 °C). Finally, the WLED fabricated based on (B0.4K1.6)0.84AO:Eu and commercial green and red phosphors exhibited an ultra-high color rending index with Ra = 95.5 and R1–R15 >90. This work offers guidance for tuning the spectral properties of phosphors through lattice site engineering.
研究领域:
材料科学
·
光子学
·
固态照明
·
发光材料
·
光电子学
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Wei Wang,Mengxuan Tao,Yixin Liu,Yi Wei,Gongcheng Xing,Peipei Dang,Jun Lin,Guogang Li
Controlling the site selection of activators via chemical substitution to optimize and design luminescence materials is an essential part of rare-earth-activated phosphors. Herein, we report the UCr4C4-type CsKNa2–yLiy(Li3SiO4)4:Eu2+ and CsKNa2(Li3Si1–zGezO4)4:Eu2+ phosphors, in which there are three crystallographic sites (Cs, K, and Na), and the site engineering for Eu2+ activators is utilized to tune the luminescence properties. First, Li+ ions are introduced to control the migration of Eu2+ ions from K sites to Na sites, realizing the spectral tuning from cyan narrow band [λem = 485 nm, full width at half-maximum (fwhm) = 27 nm] to green narrow band (λem = 526 nm, fwhm = 58 nm). Moreover, the variation of local lattice caused by Li+ ions improves the internal quantum yields from 39 to 82% as well as reduces the thermal quenching (90% @ 150 °C of integrated intensity at 20 °C). Second, the Ge4+ ions are introduced to control the shrinkage of the Na polyhedron for Eu2+ doping, leading to disappearance of the shoulder band in the green region. Simultaneously, the spectral blue shift should be ascribed to a synergistic effect of the reduction of crystal field splitting and Stokes shift. Thus, the blue-emitting CsKNa2(Li3GeO4)4:Eu2+ phosphor is obtained, which has only one symmetric blue emission at 458 nm with fwhm = 26 nm. By employing a 370 nm UV chip, the as-fabricated white light-emitting diodes using CsKNaLi(Li3SiO4)4:Eu2+ phosphor presents a superior luminous efficacy of 94.16 lm W–1, a corresponding color temperature of 5045 K, and a high color rendering index (95.8), demonstrating that the site engineering strategy based on the manipulation of chemical composition and crystal structure could be applied to tune spectral distribution and develop novel potential phosphors for practical optical application.
研究领域:
材料科学
·
光学材料
·
固态化学
·
发光材料
·
光子学
·
无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 3
·1778-1788
·
IF 4.186
Xiao Ma,Zhifeng Huang,Hailong Yuan,Yujuan Zhou,Meijuan Li,Fei Chen,Qiang Shen
Rare-earth-doped transparent glass shows great potential in white light-emitting diodes (wLEDs) application due to its excellent optical and luminous properties. Currently reported commercial wLEDs have a drawback in red emission missing, which leads to a relatively low color rendering index (CRI) and a relatively high correlated color temperature (CCT). In this work, Ce@Eu Sr–Si–O glass is fabricated using a high-temperature quenching method. The white light is available when the ratio of Ce 3+ /Eu 3+ equals 1, and the emitting color can be adjusted from blue to red by controlling the ratio of Ce 3+ /Eu 3+ . To further optimize the white light, Eu 3+ ions can be reduced to Eu 2+ according to the reaction of 6Eu 3+ + 2N 3− → 6Eu 2+ + N 2 ↑ by introducing Si 3 N 4 . As a result, the standard white light emission can be achieved in the Ce@Eu silicate glass contributed by the blue light from Ce 3+ , red light from Eu 3+ , and yellow–green light from Eu 2+ (two elements, three emission). This glass shows excellent luminous properties, such as a color coordinate is (0.3651, 0.3269) in CIE 1931 color coordinate diagram, a CRI is over 70, a high quantum yield of 36.02%, and a CCT of 4117 K.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ou Hai,Peng Li,Xin An,Weikang Dong,Tong Li,Zechuan Qi,Yuanting Wu
In order to broaden the application field of long afterglow materials, it is a challenge to realize high stability and multicolor properties of long afterglow materials. The photoconversion method is a condition that enables simultaneous afterglow color shifts, however, the stable and efficient photoconversion agent is an urgent problem. This study propose a strategy to synthesize CsPbBr 3 quantum dots (QDs) directly within porous SiO 2 on the surface of Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ (SMS). The resulting composites achieve a shift in emission and afterglow color from blue (about 468 nm) to green (about 520 nm), and in the UV irradiation for 8 days, the luminous intensity is almost unaffected, in the air exposure for 3 months, the luminous intensity can still be maintained at more than 80 % of the initial value. Since the synthesized composite material is a powder, it can be mixed with various media. Composite materials can be homogeneously mixed with coatings, resulting in coatings with a variety of luminescent colors and producing effective multicolor luminescence, which has significant potential in the field of luminescent coatings and anti-counterfeiting.
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Jun Xu,Jiabei Sun,Xiaoming Liu,Sisi Zhan,Yanqing Li,Along Gao,Jun Lin
In this work, a series of Eu2+-activated phosphors, including Sr3Sc4-xO9:xEu2+, Ba3(1–y)Sr3ySc3.985O9:0.015Eu2+ (0 ≤ y ≤ 1), and Ba3Sc4-xO9:xEu2+, were successfully synthesized via a sol–gel method. The Sr3Sc4-xO9:xEu2+ phosphors exhibited a broad red emission band centered at 609 nm under 430 nm blue-light excitation, with a measured internal quantum yield of 47.94%. Upon partial substitution of Sr2+ by Ba2+ in Sr3Sc3.985O9:0.015Eu2+, a pronounced redshift in the emission maximum was observed, extending from 609 to 843 nm and thereby covering the entire visible to near-infrared (NIR) spectral range, corresponding to a total shift of 234 nm. Structural analysis indicates that the emission behavior of Eu2+ is strongly influenced by its coordination environment within [Sr/Ba1O6] and [ScO6] octahedra, which exhibit low-symmetry fields and induce substantial crystal field splitting (CFS). Thermal quenching behavior was evaluated by monitoring emission intensity at 150 °C, where Sr3Sc3.985O9:0.015Eu2+, Sr1.5Ba1.5Sc3.985O9:0.015Eu2+, and Ba3Sc3.985O9:0.015Eu2+ retained 85.8%, 75.1%, and 65.8% of their room-temperature luminescence, respectively. These findings demonstrate excellent thermal stability and tunable red-to-NIR emission, establishing this phosphor family as a promising candidate for next-generation NIR-emitting materials and photonic applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Baofeng Zheng,Yanhua Song,Zhibo Zheng,Yanxia Zhao,Qing Yang,Zhan Shi,Bo Zou,Haifeng Zou
A novel green-light-emitting silicon-based oxynitride phosphor Ca4Y3Si7O15N5:Eu2+ with low thermal quenching and ideal pressure sensitivity is reported. The Ca3.99Y3Si7O15N5:0.01Eu2+ phosphor can be efficiently excited by 345 nm ultraviolet light and shows very low thermal quenching (integrated and peak emission intensities at 373 and 423 K were 96.17, 95.86, and 92.73, 90.66% of those at 298 K, respectively). The correlation between high thermal stability and structural rigidity is investigated in detail. The white-light-emitting diode (W-LED) is assembled by depositing the obtained green-light-emitting phosphor Ca3.99Y3Si7O15N5:0.01Eu2+ and commercial phosphors on a ultraviolet (UV)-emitting chip (λ = 365 nm). The CIE color coordinates, color rendering index (Ra), and corrected color temperature (CCT) of the obtained W-LED are (0.3724, 0.4156), 92.9, and 4806 K, respectively. In addition, when subjected to in situ high-pressure fluorescence spectroscopy, the phosphor exhibits an evident red shift of 40 nm with an increase in pressure from 0.2 to 32.1 GPa. The phosphor has the advantage of high-pressure sensitivity (dλ/dP = 1.13 nm GPa–1) and visualization with pressure changes. The possible reasons and mechanisms are deeply discussed in detail. Based on the above advantages, Ca3.99Y3Si7O15N5:0.01Eu2+ phosphor is expected to have potential applications in W-LEDs and optical pressure sensing.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 32
·19173-19186
·
IF 10.733
Xiaoming Liu,Xueya Chen,Yizu Li,Bingquan Wu,Xubiao Luo,Sheng Ouyang,Shenglian Luo,Abdulaziz A. Al Kheraif,Jun Lin
Here, we demonstrate a g-C3N4@Au@SrAl2O4:Eu2+,Dy3+ composite as a novel efficient self-luminous visible-light plasmonic photocatalyst for photocatalytic degradation of organic pollutants and hydrogen evolution from water around the clock. The g-C3N4@Au@SrAl2O4:Eu2+,Dy3+ composite was prepared by integrating a g-C3N4@Au plasmonic photocatalyst composite with a SrAl2O4:Eu2+,Dy3+ long-afterglow phosphor through a simple Pechini-type sol–gel method followed by a mechanical mixing and high-temperature calcination process. Owing to the synergistic effect of surface plasmon resonance of the Au nanoparticles in g-C3N4 and long-lasting phosphorescence of the SrAl2O4:Eu2+,Dy3+ phosphor, the prepared g-C3N4@Au@SrAl2O4:Eu2+,Dy3+ composite shows a continuous and efficient photocatalytic activity for photocatalytic degradation of organic pollutants and hydrogen evolution from water in a sunless environment. The current research study could provide a new strategy for designing a highly efficient composite photocatalyst for solar environmental purification and hydrogen energy production around the clock.
研究领域:
光催化
·
环境科学
·
材料科学
·
可再生能源
·
纳米技术
✓ 已验证
DOI
高影响因子
Optical Materials Express
·
2022
·Vol. 12
·期 10
·4117-4132
·
IF 3.074
Zihan Zhao,Zihan Zhao,Ran Zhang,Ran Zhang,Hao Song,Yanjie Zhang,Yanjie Zhang,Yanjie Zhang,Xiuping Wu,Desheng Li,Bing Li,Bing Li
As blue emitting component in phosphor-converted white-light-emitting-diodes (pc-wLEDs) encapsulated with near-ultraviolet (NUV) chips, Eu2+ activated fluorapatite structure phosphors play key roles because of strong structural stability and excellent photoluminescent properties. A series of M5(PO4)3F: Eu2+ (M = Ca, Sr) samples have been newly prepared by deposition-precipitation process (DP) and exhibited a 6.7-fold enhancement of photoluminescent (PL) intensity due to the highly dispersed Eu2+ luminescence centers when compared with the reference samples synthesized via traditional solid-state reaction method (SSR). Detailed analysis of crystal field around Eu2+ and the nonlinear fitting of PL spectra concludes that Eu2+ activators with the 4f6 → 4f75d transition preferentially replace Ca1 in 4f symmetry sites leading to a fitted peak at 446 nm and the other sites of 6h are contributed to the 479 nm emitting of Eu2+ ions. Remarkably, tunable chromaticity of DP-M5(PO4)3F: Eu2+ with high color purity (97.79%) retains steady photoelectric converting and full width at half maxima (FWHM) of 46 nm in the device of DP-FAp: 0.03Eu2+@365 nm LED under diverse driving currents, which perfectly satisfies the requirements of excitation light source for oral photocuring materials. Further, the 123.4% color gamut of National Television System Committee (NTSC) standard is efficiently obtained by matching Sr5(PO4)3F: Eu2+, CsPbBr3 and Lu3Al5O12: Mn4+ phosphors with a 365 nm chip (1 W) to achieve high-quality white light (CRI value reaches to 86, CCT is 7107 K and CIE chromaticity coordinate arrives at (0.292, 0.376), indicating a potential candidate for dentistry curing light and high-quality NUV excited pc-wLEDs.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Kaiming Zhu,Zhanglin Chen,Yuzhen Wang,Hui Liu,Yude Niu,Xin Yi,Yihuan Wang,Xuanyi Yuan,Guanghua Liu
Eu 2+ -doped CaAlSiN 3 ‐type structure nitrides have been extensively studied as a red-emitting phosphors in white light emitting diodes (w-LEDs), but there are few reports of systematic research on the effect of solid solution substitution on their long persistent luminescent properties. In this work, a series of (M,Ca)AlSiN 3 :Eu 2+ (M = Sr, Mg) phosphors have been successfully synthesized by efficient combustion synthesis . We investigated the effect of Sr and Mg solid solution on long persistent luminescent properties. Thermoluminescence (TL) measurements were performed in those persistent phosphors to obtain direct experimental results on the trap depth. The results show that the SrAlSiN 3 :0.2 at% Eu 2+ phosphor exhibits the most intense red persistent luminescence with the persistent time of as long as 200 min at the threshold value of 0.32 mcd/m 2 due to the presence of more trap levels with suitable depths of 0.71 eV. Compared with the solid solution of Sr, the solid solution of Mg ions can increase the depth of trap levels in CaAlSiN 3 . Among them, Mg 0.2 Ca 0.8 AlSiN 3 :0.2 at% Eu 2+ phosphor achieved a maximum trap depth of 0.98 eV, making it a promising candidate for optical information storage applications.
✓ 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）