JOURNAL OF RARE EARTHS
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2023
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IF 4.9
Danyu Zhang,Yuxuan Luo,Junyu Chen,Lianjie Li,Hai Guo
Dual-excitation and dual-emission Y 4 GeO 8 :Bi 3+ ,Sm 3+ phosphors were manufactured by traditional solid-phase sintering technique. The X-ray diffraction, morphology, photoluminescence, energy transfer process and temperature sensing properties of Y 4 GeO 8 :Bi 3+ ,Sm 3+ samples were comprehensively evaluated. The Y 4 GeO 8 :Bi 3+ ,Sm 3+ phosphors exhibit characteristic emissions of Bi 3+ ( 3 P 1 → 1 S 0 ) and Sm 3+ ( 4 G 5/2 → 6 H) under both 290 and 347 nm excitations. In fluorescence intensity ratio and Commission International de L'Eclairage coordinates modes, Y 4 GeO 8 :Bi 3+ ,Sm 3+ samples present excellent temperature measurement performance. The maximum relative sensitivity ( S r-max ) values of the former are 1.55 %/K (460 K, 290 nm excitation) and 0.82 %/K (506 K, 347 nm excitation). The S r-max ( x ) values of the latter are 0.21 %/K (437 K, 290 nm excitation) and 0.15 %/K (513 K, 347 nm excitation). These results illustrate that Y 4 GeO 8 :Bi 3+ ,Sm 3+ phosphors can be used as a candidate material for a dual-mode optical thermometer under dual-excitation.
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JOURNAL OF LUMINESCENCE
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2023
·
IF 3.6
Yingzhen Wu,Lin Lin,Zheng Li,Yanan Zhang,Zhuohong Feng,Zhezhe Wang,Zhiqiang Zheng
Up to now, the research field of application of lanthanide ions doped lead-free double perovskite Cs 2 AgInCl 6 nanocrystals (NCs) was relatively limited, even less in temperature sensing. Here, Tb 3+ /Ho 3+ /Bi 3+ ions were successfully doped into Cs 2 AgInCl 6 NCs by hot-injection. The temperature sensing performance of co-doped NCs by using the fluorescence intensity ratio (FIR) was studied through the temperature-dependent emission spectra . By analyzing the influence of ions' doping concentration on temperature sensing performance, the optimal doping concentration of co-doped Cs 2 AgInCl 6 NCs was determined to be 7 % Tb 3+ , 20 % Ho 3+ and 1 % Bi 3+ . The highest absolute and relative sensitivities reach 1.48 K −1 and 2.48 %/K, respectively. We provide a new doping scheme of lead-free double perovskite NCs which have good temperature sensing performance. This co-doped NCs have great potential application value in non-contact temperature sensing in nanoscale .
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CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Shuai Wei,Zeyu Lyu,Zheng Lu,Pengcheng Luo,Luhui Zhou,Dashuai Sun,Taixing Tan,Sida Shen,Hongpeng You
Trap engineering is widely applied to contend with thermal quenching of phosphors. However, the incidental detriment of the luminescent efficiency has long been neglected. Herein, we propose a paradigm for achieving a high-performing Bi3+-doped phosphor with moderate trap engineering. Through introducing appropriate traps in a neutral atmosphere and proper doping concentration, we have successfully created a novel Ba2GdAlO5:Bi3+ yellow phosphor that exhibits exceptional thermal stability (104.1%@423 K) and a high internal quantum yield (82.78%), which is the top performance among Bi3+-doped phosphors. The oxygen vacancy and Bi2+ were identified as the responsible traps through X-ray photoelectron spectroscopy, while their depth was measured to be 0.9 eV by using thermoluminescence. Notably, the phosphor exhibited photochromism upon near-ultraviolet (n-UV) excitation and could be bleached through heat treatment. These observations highlight its potential for various applications. Finally, two white lighting devices with a color rendering index exceeding 90 were prepared with n-UV LED chips by applying Ba2GdAlO5:Bi3+ as one of the phosphors. This study not only provides a high-performance Bi3+-doped phosphor suitable for high-quality white LED (WLED) lighting but also proposes a methodology for designing phosphors with high efficiency and thermal stability..
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JOURNAL OF LUMINESCENCE
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2022
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IF 4.171
Huidong Tang,Yanqiao Xu,Xiaobo Hu,Qing Hu,Ting Chen,Weihui Jiang,Lianjun Wang,Wan Jiang
Lead-free alloyed Cs 2 AgInCl 6 nanocrystals (NCs) are currently considered as a new class of lead halide perovskite alternative due to their less toxicity and excellent intrinsic stability. However, their solution preparation process with oleylamine as ligands are easy to the formation of metallic Ag due to the reduction of Ag + , resulting in poor photoluminescence (PL) performance of NCs. Herein, a facile one-pot solution synthesis strategy was proposed to prepare stable Bi 3+ doped Cs 2 AgInCl 6 NCs via tri-n-octylphosphine (TOP) as co-ligands, and the emission mechanism was further investigated. The prepared Bi 3+ doped Cs 2 AgInCl 6 NCs show broad dual emission bands at around 410 nm and 565 nm, in which the violet emission band is ascribed to the surface defect states, while the yellow emission band of as-synthesized NCs is attributed to the 3 P 1 → 1 S 0 self-trapped excitons recombination of Bi 3+ ions. Due to the introduction of BiCl 6 states after doping with Bi 3+ and well elimination of surface metallic silver by strongly coordinating of TOP, the PL quantum yield of as-synthesized NCs is obviously elevated from 1.25% to 5.10%. The prepared Bi 3+ doped Cs 2 AgInCl 6 NCs exhibit excellent storage stability and light stability, making it a promising single emitter fluorescence material for white light-emitting diode devices.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Shuai Wei,Zhijun Li,Zeyu Lyu,Dashuai Sun,Sida Shen,Jianhui Wang,Chengyu Zhuo,Hongpeng You
In this work, we provide a paradigm how to realize white light emission by utilizing the energy transfer from the Bi 3+ to Eu 3+ ions. First, a novel Bi 3+ activated phosphor set of highly oxygen-deficient perovskite derivatives (Ba 3 YGa 2 O 7.5 , BYGO) were synthesized through the conventional high-temperature solid-state method. The crystal structure was confirmed by Rietveld refinement . Then, Eu 3+ was introduced to the phosphor composition to construct energy transfer pathway with Bi 3+ . The emission color of the BYGO:Bi 3+ ,Eu 3+ phosphors can be changed from cyan to white and orange-red by altering the Bi 3+ /Eu 3+ doping ratio. The energy transfer from the Bi 3+ to Eu 3+ ions was ascribed to dipole-dipole interaction. Finally, a single-component WLED device with a color-rendering index of 84.9 was successfully prepared by employing a near-ultraviolet chip and the BYGO:Bi 3+ ,Eu 3+ phosphors. This work not only indicates that the as-prepared BYGO:Bi 3+ ,Eu 3+ phosphors are a potential candidate for near-ultraviolet WLED, but also demonstrated that energy transfer is an avenue for single-phased white light emission.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 5
·2607-2618
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IF 2.779
Gao Zhihua,Fu Fengyan,Niu Lili,Jin M.
In the recent years, luminescent phosphor materials have contributed much to reduce the serious environmental problems such as environmental pollution, greenhouse effect, and energy crisis, but most of them commercially used for fabricating white LEDs are rare earth (RE) ions doped materials. Here, the non-RE Bi 3+ -doped Ba 2 (Y,Sc)NbO 6 solid solution nanocrystals are prepared using a high temperature solid state route followed by a ball milling and griddle selection. Our experiments show that when the Y 3+ ions are replaced by the Sc 3+ ions, the obtained solid solution nanocrystals show a shift of X-ray reflection positions to higher angle, and the emission peaks from blue to blue-green. At the same time, a 1.35 time of PL intensity enhancement under 365 nm excitation is achieved in the Ba 2 (Y 0.58 ,Sc 0.4 )NbO 6 :0.02Bi sample when compared to the Ba 2 Y 0.98 NbO 6 :0.02Bi sample. In addition, this optimal sample shows the quantum efficiency of 76% and good thermal stability with T 50% value of 205 °C. By depositing the Ba 2 (Y 0.58 ,Sc 0.4 )NbO 6 :0.02Bi and commercial red Sr 2 Si 5 N 8 :Eu 2+ phosphors on a 365 nm UV LED chip at a driving current of 30 mA, a white LED device, with a CIE coordinates at (0.364, 0.379), a high color rendering index of 76.8 and luminous efficiency of 67 lm, and a low color temperature of 3469 K, is achieved.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2025
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IF 3.8
Bocheng Lei,Ligan Ma,Lili Zhang,Rongfei Wei,Hai Guo
Optical thermometric and anti-counterfeiting multifunctional materials hold great promise for practical applications, yet their development continues to encounter considerable challenges. Here, we successfully developed a new Bi 3+ ,Er 3+ co-doped Y 2 GaSbO 7 powder with multicolor luminescence. Through adjusting the excitation wavelengths, emissions in violet, blue, green, and orange are achieved. The phosphor demonstrates remarkable thermochromism due to the distinct temperature-dependent luminescence of Bi 3+ and Er 3+ , confirmed under irradiation at 312 or 980 nm. By reducing the power of 980 nm laser or increasing the laser-to-sample distance, the emitting color can be precisely tuned from gold‒yellow or yellow‒green to orange‒red. These diverse luminescent characteristics enable the creation of a multilevel anti-counterfeiting system. Moreover, a four-mode optical thermometry with an optimal relative sensitivity of 1.98% K −1 , a high thermal resolution of 0.15 K, and signal reversibility was established using fluorescence intensity ratio and fluorescence decay time. These results disclose that Y 2 GaSbO 7 :Bi 3+ ,Er 3+ phosphor is a promising candidate for temperature monitoring and dynamic anti-counterfeiting applications.
研究领域:
材料科学
·
光学工程
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Chengning Xie,Xigui Liu,Rongxi Yi,Youmin Guo,Fen Xiao
Developing efficient yellow-green phosphors with tunable photoluminescence properties is pivotal for enhancing both the color rendering index of near-ultraviolet pumped white LEDs and the anti-counterfeiting efficacy through dynamic chromatic encryption. In this study, a layered Ruddlesden-Popper oxychloride Sr 3 Sc 2 O 5 Cl 2 doped with Bi 3+ is prepared by high-temperature solid-state method, exhibiting a broadband emission centered at 510 nm with a high internal quantum efficiency of 90.5 %. Structural and spectroscopic analyses reveal that the yellow-green luminescence originates from the superposition of self-activated emission induced by extrinsic self-trapped excitons and interconfigurational s-p transition of Bi³ ⁺ ions. In view of the distinct excitation responses of different emission centers, excitation-wavelength modulation enables continuous emission color tuning from cyan to orange-yellow in a single-phase phosphor. The successful demonstration of high-color-rendering white light ( R a = 96) and multi-level optical encryption validates the significant application potential of Sr 3 Sc 2 O 5 Cl 2 series phosphors in next-generation near-ultraviolet pumped white LEDs and high-security anti-counterfeiting/encryption systems.
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高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Ying Wang,Zeyu Lyu,Pengcheng Luo,Zheng Lu,Dashuai Sun,Taixing Tan,Shuai Wei,Hongyang Zhang,Hanyu Hu,Hongpeng You
A series of solid-solution phosphors Ba 3 Sb 1- y Ta y Ga 3 Si 2 O 14 :Bi 3+ (0.0 ≤ y ≤ 1.0) were created using the high-temperature solid-state reaction. The crystal structure of Ba 3 Sb 1- y Ta y Ga 3 Si 2 O 14 belongs to trigonal crystal system with space group P321 (150) . The Rietveld refinements indicate that the Bi 3+ ions occupy the Ba 2+ sites. Ba 3 Sb 1- y Ta y Ga 3 Si 2 O 14 :0.03Bi 3+ has tunable luminescence property peaking from 531 to 492 nm as the Sb 5+ ions are gradually replaced by Ta 5+ ions, which are correlated with the crystal field strength variation causing by the substitution of Sb 5+ by Ta 5+ . The thermal stability of the emission at 423 K was improved from 5.4 to 49.9 %. When the obtained Ba 3 SbGa 3 Si 2 O 14 :0.03Bi 3+ /Ba 3 SbGa 3 Si 2 O 14 :0.03Bi 3+ ,0.015Eu 3+ was used as green light component, white LED devices were achieved with low CCT of 4613/4748 K and high Ra of 90.9/95.5. Moreover, multicolor luminescence was constructed by introducing red-emitting Eu³⁺ ions to create Ba 3 SbGa 3 Si 2 O 14 :0.03Bi 3+ ,0.015Eu 3+ and Ba 3 TaGa 3 Si 2 O 14 :0.03Bi 3+ ,0.015Eu 3+ phosphors. Under different excitation conditions, the multicolor emissions provide multi-modal and easily distinguishable anti-counterfeiting patterns. Our work demonstrates the feasible construct of tunable emission from Bi 3+ -doped solid-solution phosphors, providing a valuable candidate for diverse optical applications.
研究领域:
材料科学
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光学工程
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Jiarao Shi,Xiaohao Chen,Xincui Shi,Ruiping Deng,Ran Pang,Su Zhang
In this study, a series of non-gallate broadband near-infrared Mg 1.4 Zn 0.6 SnO 4 :Cr 3+ ,Bi 3+ phosphors were successfully synthesized via solid-state reaction method. Occupying octahedral sites in a weak crystal field environment, Cr 3+ ions in Mg 1 . 4 Zn 0 . 6 SnO 4 exhibit intense broadband near-infrared emission centered at 759 nm, which originates from two distinct Cr 3+ centers located at Sn 4+ and Mg 2+ /Zn 2+ sites. Although Bi 3+ does not contribute to luminescence in this phosphor and its co-doping has minimal influence on the crystal structure, Cr 3+ valence, or the concentration of effective traps, it significantly enhances both the luminescence efficiency and persistent luminescence performance by improving the crystallinity of the phosphor. With Bi 3+ codoping the external quantum efficiency of the phosphor was promoted from 15 % to 21 % and the persistent-luminescence duration was extended to over 48 h. Furthermore, the potential application of Mg 1.4 Zn 0.6 SnO 4 :0.01Cr 3+ ,0.07Bi 3+ in NIR phosphor-converted LED is explored and demonstrated. This work not only provide a new non-gallate broadband near-infrared phosphor but also proposes a new strategy for synchronously improving the luminescence efficiency and persistent-luminescence performance of Cr 3+ activated phosphors for multifunctional applications.
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Zhichao Liu,Xue Yu,Xiuxia Yang,Qingpeng Peng,Xiaodie Zhu,Xuhui Xu,Jianbei Qiu
Featured with a tunable excitation/emission wavelength and excellent physicochemical stability, inorganic fluorescent materials are widely used in the fields of anti-counterfeiting. Here, we design a multi-stimuli-responsive dynamic fluorescence and phosphorescence anti-counterfeiting material by introducing Eu3+ ions in NaGdGeO4: Bi3+ to tailor the trap structure. The photoluminescence (PL), long persistent luminescence (LPL), and photo-stimulated luminescence (PSL) colors of NaGdGeO4: Bi3+, Eu3+ can be switched by varying the excitation modes (ultraviolet, near infrared, and X-ray light). Especially, the LPL and PSL colors of NaGdGeO4: Bi3+, Eu3+ vary with increasing decay and stimulation times. In addition, X-ray excitation ensures the specificity of the luminescence of NaGdGeO4: Bi3+, Eu3+ compared with ultraviolet excitation. This rapidly-changing-color fluorescent material offers the possibility of sophisticated anti-counterfeiting applications in the future.
研究领域:
材料科学
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发光材料
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光学工程
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防伪技术
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磷光体设计
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xibao Zhang,Yonghui Xu,Xiudi Wu,Shuwen Yin,Chuansheng Zhong,Chenxue Wang,Liang Zhou,Hongpeng You
A series of novel Bi 3+ /Ln 3+ -activated Ca 2 ScSbO 6 (CSSO) phosphors were synthesized by solid-state method and their luminescent behaviors were investigated in detail. Under the 302 nm excitation, the CSSO:Bi 3+ shows remarkable near-ultraviolet photoluminescence with a peak emission at 365 nm. Eu 3+ -activated CSSO phosphor possesses high efficiency and no obvious reduction of emission intensity even after replacing Sc with Eu completely, which indicates a low-concentration quenching effect. In addition, its emission intensity at 423 K (I 423K ) still maintains 88 % compared with that of at room temperature (I 298K ), indicating good thermostability. In contrast, the CSSO:Bi 3+ phosphor exhibits a significant reduction in emission intensity, maintaining only 49 % of its luminescence at 423 K (I 423K /I 298K ). By codoping Bi 3+ and Ln 3+ (Ln = Eu, Tb, Dy, Sm), the energy transfer was observed from the Bi 3+ to Ln 3+ ions, endowing the CSSO:Bi 3+ , Ln 3+ phosphors with tunable multicolor emissions. Leveraging the differing thermostabilities of the emission spectra for Bi 3+ and Ln 3+ ions, we designed and assessed a range of sensitive optical thermometers. Among these, the CSSO:Bi 3+ , Eu 3+ phosphors exhibited the best performance, boasting maximum absolute and relative sensitivities of 9.96 % K −1 and 2.002 % K −1 , respectively. Additionally, we displayed the multi-mode anti-counterfeiting function of synthesized phosphors, and a multi-color switching system was designed with the advantages of direct visualization and easy identification of encrypted information. These results indicate that Bi 3+ and Ln 3+ coactivated CSSO phosphor has the potential application for non-contact temperature measurement and anti-counterfeiting.
研究领域:
材料科学
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光学工程
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无机化学
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功能材料
·
传感器技术
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高影响因子
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