JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Meiqing Yan,Jiapeng Yang,Fan Yang,Xiaojuan Liang,Weidong Xiang
As display technologies progress towards enhanced visual performance, there was a growing demand for color conversion materials to meet increasingly stringent performance requirements. In recent years, all-inorganic perovskite CsPbX 3 (X = Cl, Br, I) nanocrystals (NCs) had gained attention in the field of wide color gamut backlight displays due to their tunable full spectrum, narrow-band emission, high color purity, and ease of processing. However, red-emitting perovskite NCs were still facing challenges with photoluminescence quantum yield (PLQY) and stability. In this study, Yb 3+ doped CsPbBr 1 I 2 perovskite nanocrystal glass (Yb 3+ @CsPbBr 1 I 2 PNG) was synthesized using a melt-quenching technique. Samples emitting at a narrow band centered at 630 nm, with a full width at half maximum(FWHM) of 31.8 nm, exhibited a high PLQY of 80.36 % and retained fluorescence intensity at 98.2 % of the initial value in water, maintaining to 92.6 % after continuous blue light irradiation for 60 days. Moreover, the optical conversion film Yb 3+ @CsPbBr 1 I 2 @CsPbBr 3 @PET developed in our study showcased color gamut coverage surpassing 132.9 % of the NTSC 1953 standard and 98.8 % of the Rec.2020 standard. In summary, the highly efficient and remarkably stable red-emitting Yb 3+ @CsPbBr 1 I 2 PNG composite material introduced in this study paved the way for future advancements in wide color gamut and ultra-high definition backlight display technologies.
研究领域:
材料科学
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显示技术
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2022
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IF 6.364
Xinwen Liu,Guolong Tan,Zhiwei Zhou,Bingchu Mei
The Sr 5 (PO 4 ) 3 F (S-FAP) crystal material is regarded as one of the most ideal optical materials for diode pumping owing to its huge absorption and emission cross sections and long fluorescence lifespan. In this investigation, S-FAP powders with varying Yb concentrations (0.1–5%) were produced using the coprecipitation method. Then a variety of S-FAP transparent ceramics with varying Yb content were fabricated using hot-pressing sintering. The crystalline phase structure of hexagonal Sr 5 (PO 4 ) 3 F was verified by XRD analysis of the precursor powder and the final ceramics. According to the powder SEM, the average grain size and the long axial-radial ratio of powders are decreasing as the Yb 3+ concentration increases. Thermal-etched surface SEM reveals nanostructured S-FAP transparent ceramics with an average grain size of less than 200 nm were synthesized. The highest transmittances of the 3% ceramics at 500 and 1100 nm wavelengths are 51% and 79.78%, respectively. The ceramic cross-sectional SEM demonstrated that porosity is the primary scattering source influencing the enhancement of optical characteristics. The absorption, emission, and fluorescence lifetimes of S-FAP transparent ceramics with varying Yb concentrations were tested and discussed, and the absorption and emission cross sections corresponding to the major peak were reported. Some physical parameters of this set of ceramic samples were shown, including thermal diffusivity , specific heat capacity, and thermal diffusivity data, as well as micro-hardness.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2022
·Vol. 105
·期 7
·4581-4587
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IF 4.186
Xinwen Liu,Guolong Tan,Weiwei Li,Bingchu Mei
The 2 at.% Yb 3+ :Sr 5 (PO 4 ) 3 F (S-FAP) polycrystalline transparent ceramic with asymmetric hexagonal structures has been synthesized by vacuum hot-pressing the nanoparticles prepared via coprecipitation method. X-ray diffraction results of powder and ceramic indicate that their phase peaks are well matched to the crystal structure of S-FAP. The average particle size of 35.5 nm has been exhibited by powder scanning electron microscopy images, and subsequent images of the ceramic cross section and surface morphology revealed a homogenous and compact microstructure with an average grain size of around 220 nm. The relationship between the optical loss caused by the scattering of anisotropic ceramic grains and the optical transmittance of ceramics was revealed in the hexagonal S-FAP transparent ceramics with different thicknesses. The in-line transmittance of hot-pressed ceramics with 1.5-mm thickness achieved 79.95% at 1100-nm wavelength, and the room-temperature absorption and emission spectra of Yb 3+ in S-FAP polycrystalline ceramic matrix were measured using a spectrofluorometer.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
PHYSICA B-CONDENSED MATTER
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2018
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IF 1.453
Wenbo Peng,Tao Pang
In this paper, Y 2 Mo 4 O 15 :Yb 3+ /Er 3+ upconversion phosphors are prepared by a co-precipitation method. In the case of 20% Yb 3+ doping, the intense green upconversion luminescence is obtained, which can be attributed to the energy transfer from Yb 3+ -MoO 4 2- dimer to Er 3+ that suppresses the multi-phonon relaxation of 4 I 11/2 to 4 I 13/2 . Similar the Yb 3+ sensitization, the dimer sensitization is also dependent on the Yb 3+ concentration. When the Yb 3+ concentration exceeds 20%, the luminescence is quenched by the cross relaxation and energy migration between dimers. A method for evaluating the reliability of temperature measurement standards is reported. Moreover, in term of the reliable temperature scale, the maximum absolute sensitivity of sample doped with 20% Yb 3+ is determined to be 0.0117 K -1 . Favorable sensing ability and strong upconversion luminescence indicate that the optimum sample is potentially applicable as the optical thermometric materials.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 26
·3657-3665
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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
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固体化学
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发光材料
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晶体学
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光谱学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
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2022
·
IF 3.574
Jinhua Du,Ye Zhao,Yanyu Wang,Jing Ai,Yong Li,Xihong Hao
High energy density is an important factor for antiferroelectric materials applied in power pulse devices. Herein, the Ag (1-3x) Yb x NbO 3 (AYNO-100 x ) ceramics with x = 0, 0.02 and 0.04 were synthesized via a solid-state reaction method in an oxygen atmosphere. The Yb 3+ doping at A-site reduces the oxygen vacancy and increases the silver vacancy after reaching saturation, which improves the antiferroelectric stability, leading to enhanced recoverable energy-storage density of 2.7 J/cm 3 under 255 kV/cm at room temperature. Meanwhile, a relatively high discharge energy density of 1.0 J/cm 3 at 200 kV/cm is also observed in the Ag 0.94 Yb 0.02 NbO 3 ceramic. These results indicate that AgNbO 3 -based ceramics are potential candidates in advanced power electronic devices.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
ACS Applied Optical Materials
·
2024
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IF 0
Jiaxin Li,Yujiao Zhang,Pengli Wang,Dan Xiao,Cuisong Zhou
Alloyed upconversion nanoparticles (aUCNPs, NaYbF4:10% Er@NaYF4) with high Yb3+ doping were designed to brighten luminescence, exploring multicolor patterns of information encryption. The luminescence intensity of aUCNPs was 2.3 times higher than that of common doped UCNPs reported (dUCNPs, NaYF4:20% Yb, 2% Er@NaYF4). Furthermore, because of the high Yb3+ doping (90%), both green and red emissions of aUCNPs were enhanced, ∼4.2 and ∼17.2 times stronger than that of NaYF4:20% Yb, 10% Er@NaYF4, respectively. The reasons for the aUCNPs having a brightened luminescence were explored by synthesizing four UCNPs with different structures and comparing their luminescence. These are attributed to their unique features: (1) a larger absorption cross section for accumulating energy, (2) more efficient energy transfer between Yb3+ and Er3+, and (3) their inert shell inhibiting surface quenching. Eventually, three colors including yellow, orange, and red were obtained by combining aUCNPs and neutral red (NR) taking advantage of the inner filter effect (IFE), and aUCNPs were thus successfully applied in information encryption with multicolor patterns.
研究领域:
材料科学
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光学
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信息安全
✓ 已验证
DOI
MATERIALS LETTERS
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2021
·
IF 3.423
Heming Ji,Jiale Tang,Xunze Tang,Zhe Yang,Haiyan Zhang,Yannan Qian
The rod-like NaNbO 3 :Er 3+ /Yb 3+ nanocrystals codoped with Mg 2+ ions were firstly synthesized by hydrothermal method. The effect of Mg 2+ ions on the phase structure and morphology of NaNbO 3 :Er 3+ /Yb 3+ was investigated by XRD and SEM spectra. Addition of Mg 2+ ions enhanced the intensities of green and red UC emissions by about 3 times and prolonged the lifetime of the 4 S 3/2 → 4 I 15/2 transition of Er 3+ ions. The pump power dependences were measured to understand the upconversion mechanism under 980 nm excitation. The tailored local environment of Er 3+ ions by codoping Mg 2+ ions was responsible for the improved optical characteristics of NaNbO 3 :Er 3+ /Yb 3+ /Mg 2+ nanocrystals.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2020
·Vol. 5
·期 3
·1468-1476
·
IF 6.788
Hao Cai,Zhen Song,Quanlin Liu
Photodynamic therapy needing ultraviolet (UV) in deep tissue is hindered due to the low biological tissue penetration ability of UV light. Here, we demonstrate a persistent ultraviolet-emitting phosphor, LiLuGeO4:Bi3+,Yb3+, which can be re-stimulated by near infrared (NIR) light. Yb3+-doping significantly enhances the trap density without changing the thermoluminescence peak positions. The phosphor can be effectively activated by a 254 nm lamp and exhibits prominent persistent luminescence peaking at 350 nm. The decay time can be recorded much longer than 15 h. This phosphor exhibits simulated in vivo photostimulated persistent luminescence after a longtime decay by using in vitro NIR light penetrating biological tissue. Combined with CaAlSiN3:Eu2+, red persistent luminescence from Eu2+ is obtained. LiLuGeO4:Bi3+,Yb3+ makes up the shortage of excellent UVA persistent phosphors. It is expected to have potential applications as an in vivo renewable excitation source to trigger photosensitizers or fluorescent probes when used for biophotonic applications.
研究领域:
材料科学
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生物光子学
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医学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2018
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IF 2.732
Jun Liu,Huawei Deng,Fengzhen Lv,Wenjie Kong,Dihu Chen,Fuchi Liu,Lizhen Long
The large number of energy levels available to lanthanide ions makes the emission mechanism of lanthanide-doped luminescent materials extremely complicated. Herein, we focus on the discussion and analysis of luminescence manipulation in Gd 2 O 3 :Yb 3+ /Er 3+ nanocrystals and systematically investigate ion-ion interaction–induced energy transfer in up- and downconversion processes to shed light on the manipulation mechanism, showing that the luminescence of the above nanocrystals can be controlled by varying the content of Yb 3+ . Based on Dexter's energy transfer theory and the fact that excitation of Er 3+ ions results in the appearance of emission attributed to the 2 F 5/2 → 2 F 7/2 transition of Yb 3+ in the near-infrared region (950–1100 nm), this behavior is ascribed to the occurrence of energy transfer from Er 3+ to Yb 3+ .
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Zhurong Mo,Hongli Wen,Xin Gao,Chonge Ta,Zhongfei Mu,E. A. Dawi,Deshmukh Abdul Hakeem
Fluorescence thermometry is extensively utilized in many fields owing to its high efficiency and accuracy of detection. The fluorescence intensity ratio (FIR) using thermally coupled energy states of Er3+ is a promising route to produce thermometers with high spatial resolution and rapid response. Herein, Y2−xLaCaGa3ZrO12:xEr3+ and Y1.92−yLaCaGa3ZrO12:0.08Er3+, yYb3+ phosphors were synthesized using a solid-state reaction method. Their crystal structure, dual mode luminescence and potential for down-conversion (DC) temperature sensing application were investigated. With an increase in the Yb3+ ion concentration, the DC luminescence of Y1.92−yLaCaGa3ZrO12:0.08Er3+, yYb3+ (0.05 ≤ y ≤ 0.5) phosphors under 374 nm excitation was significantly decreased, suggesting an efficient Er3+ → Yb3+ energy transfer (ET), which was supported by decay lifetime analysis and varified via calculating ET efficiency that significantly increased from 20% to 67%. Moreover, the temperature-dependent DC emission spectra (in the 78–525 K range) and their temperature-sensing properties (absolute and relative sensitivities) were evaluated using FIR technique. The highest SA (0.001825 K−1) and SR (2.939% K−1) for Y1.92LaCaGa3ZrO12:0.08Er3+ were obtained at 425 K and 200 K, respectively. Conversely, for Y1.72LaCaGa3ZrO12:0.08Er3+, 0.2Yb3+, even with a lower SA (0.001582 K−1 at 500 K), the SR value was enhanced significantly to 1209/T2 (200–300 K) and 990.7/T2 (300–525 K) from 1175/T2 (200–300 K) and 883.1/T2 (300–525 K), respectively, for Y1.92LaCaGa3ZrO12:0.08Er3+. The highest SR was observed to be 2.939 and 3.023% K−1 for Y1.92LaCaGa3ZrO12:0.08Er3+ and Y1.72LaCaGa3ZrO12:0.08Er3+, 0.2Yb3+ thermometers, at 200 K with the lowest thermal resolution of 0.17 and 0.16, respectively, which is quite high as compared to the other reported thermometers. Therefore, we believe that the phosphors under investigation are promising candidates for non-contact mode temperature sensing application.
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
Hang Liu,Zhi Ye,Ding Sun,Lixin Zhang,Xueyan Lv,Wentong Cai,Yuhong Zhang
Rear earth(RE)-doped halide perovskite has generated as an amazing optical material for multicolor luminescence. Free-lead halide double perovskites have attracted interesting because of their non-toxicity and higher instability. Here, RE 3+ doped chloride-based double perovskite phosphors are reported. A series of heavy concentration Ho 3+ /Yb 3+ doped Cs 2 NaBiCl 6 (CNBC) phosphors are prepared with a solvothermal route. The band structure of CNBC is calculated through density functional theory (DFT). The luminescence properties of CNBC:Ho 3+ and CNBC:Ho 3+ /Yb 3+ are investigated through upconversion(UC) and downshifting(DS) processes. From CNBC:Ho 3+ , the brightness orange, deep red and pale green lights are achieved under excitation at 365, 452 and 980 nm. The multicolor emissions of CNBC:Ho 3+ are used to multimode fluorescent anti-counterfeiting. Comparing with CNBC:Ho 3+ samples, the UC emission intensity of CNBC:Ho 3+ /Yb 3+ are dramatically enhanced. The brightness green light can be seen by naked eyes under super lower power pumping(∼10 mW). The temperature sensing properties of CNBC:Ho 3+ /Yb 3+ phosphor are investigated systematically based on the luminescence intensity ratio(LIR) of thermally coupled levels(TCLs)( 5 F 1 / 5 G 6 , 5 F 2,3 / 3 K 8 ) and non-TCLs( 5 F 4 / 5 S 2 , 5 F 5 ). The maximum relative sensitivity(S R ) reaches 5.089% K −1 at 293 K according to the LIR of non-TCLs. The work will broaden the application field of RE 3+ -doped free-lead perovskite such as anti-counterfeiting and thermometry.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
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