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
·
光学工程
·
防伪技术
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磷光体设计
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JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Falin Zhang,Xiaoying Liang,Rongfei Wei,Hai Guo,Fangfang Hu
In this work, a group of Bi 3+ /Eu 3+ -doped SiO 2 –Al 2 O 3 -MCO 3 (M = Ca, Sr, Ba) glasses were fabricated through melt-quenching method. Their structure and photoluminescence characters were studied via X-ray diffraction (XRD), UV–Vis transmission spectra (TRS), excitation spectra, emission spectra and decay lifetimes. The XRD results show that no nano-crystal phase forms in glass matrix with different doping concentrations of Bi 3+ and Eu 3+ ions. Through regulating optical alkalinity value, the intensity of Bi 3+ ions increases and the peak position shifts to red wavelength. The Bi 3+ /Eu 3+ co-doped glasses show a blue-white-yellow-red luminescence by changing concentration of Eu 3+ ions. Energy transfer efficiency from Bi 3+ to Eu 3+ can reach as high as 10.54%. At 423 K, the emission intensity of 55SiO 2 –10Al 2 O 3 –35BaO-0.25Bi 2 O 3 (GBE0.5) is 31.1% of that at 308 K. Meanwhile, the activation energy of the glass matrix is 0.251 eV. All results suggest that these Bi 3+ /Eu 3+ co-doped glass samples possess potential application in LED field.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Yangxian Huang,Dawei Lan,Guangliang Zhang,Riran Zang,Kunsong Hu,Man Mo,Zhijie Fang,Weijian Li,Haiqing Zhan,Xianquan Ming,Guanhan Huang,Guiliang Li,Minfeng Huang,Feng Zhan
The lead-free double perovskite with low toxicity and good performance stability has attracted much attention in optoelectronic device applications. But their photoluminescence quantum yields (PLQY) are low, which limits their applications. Co-doping and alloying are the most valuable methods to improve its PLQY and stability. In this study, we successfully synthesized Bi 3+ and Fe 3+ co-doped Cs 2 Ag 0.6 Na 0.4 InCl 6 double perovskite using the hydrothermal method , and the emission mechanism was further investigated. Under UV-light excitation, the Cs 2 Ag 0.6 Na 0.4 InCl 6 : Bi 3+ /Fe 3+ shows dual emission. This emission results from the modification effect of self-trapped exciton (STE) formation, and Fe 3+ induces longer wavelength emission. By changing the doping contents of Bi 3+ and Fe 3+ , the revolution of double perovskite color from yellow to orange-red can be observed, and its PLQY is up to 39.95%. The studies of the PL emission mechanism reveal that energy transfer occurs between the STE and Fe 3+ , and different doping contents can affect this transfer mechanism. This work has implications for producing double perovskite for optoelectronic semiconductors and provides direction for designing new lead-free double perovskites.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Pingan Tan,Xu Huang,Jingsong Liu,Lijia Cao,Fei Yang,Chong Xian,Honglan Yuan
Y 2.5- x Bi 0.5 Al x Fe 5 O 12 (YIG-Al x ) ceramics have been synthesized at 1175 ℃ by the solid-state reaction method. The effects of the co-doped Bi 3+ , Al 3+ ions on the phases, micromorphology, and dielectric and magnetic properties of the yttrium iron garnets (YIG) were investigated. Excessive introduction of Al 3+ ions led to the collapse of the YIG lattice and precipitation of the Bi 3+ and Fe 3+ ions; while moderate Al 3+ doping improved the dielectric properties , but not the saturation magnetization. The YIG-Al 0.2 ceramics proved to have particularly good electromagnetic properties ( ε r = 18.34 ± 0.05@11.19 GHz, tan δ = 3.09 ± 0.55 × 10 −4 , M s = 19.82 ± 0.55 emu/g). Additionally, tightly bonded Y 2.3 Bi 0.5 Al 0.2 Fe 5 O 12 /Ni 0.8 Zn 0.2 Fe 2 O 4 (YIG-Al 0.2 /NZF) composite substrates were prepared by co-firing at 1175 ℃. The composite substrates exhibited superior electromagnetic properties (YIG-Al 0.2 : ε r = 18.37 ± 0.05@11.15 GHz, tan δ = 3.08 ± 0.55 × 10 −4 , M s = 21.09 ± 0.55 emu/g; NZF: M s = 67.5 ± 0.55 emu/g), which were slightly affected by the diffusion of Ni and Zn from the NZF. Our findings show that YIG-Al 0.2 /NZF substrates have great potential for use as RF band circulators.
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Nanomaterials
·
2023
·Vol. 13
·期 3
·549
·
IF 5.3
Yang Yu,Wei Zhou,Cheng Li,Peigeng Han,Hui Li,Kun Zhao
Lead halide perovskites have achieved remarkable success in various photovoltaic and optoelectronic applications, especially solar cells and light-emitting diodes (LEDs). Despite the significant advances of lead halide perovskites, lead toxicity and insufficient stability limit their commercialization. Lead-free double perovskites (DPs) are potential materials to address these issues because of their non-toxicity and high stability. By doping DP nanocrystals (NCs) with lanthanide ions (Ln3+), it is possible to make them more stable and impart their optical properties. In this work, a variable temperature hot injection method is used to synthesize lead-free Tb3+-doped Cs2NaInCl6DP NCs, which exhibit a major narrow green photoluminescence (PL) peak at 544 nm derived from the transition of Tb3+ 5D4→7F5. With further Bi3+co-doping, the Tb3+-Bi3+-co-doped Cs2NaInCl6DP NCs are not only directly excited at 280 nm but are also excited at 310 nm and 342 nm. The latter have a higher PL intensity because partial Tb3+ions are excited through more efficient energy transfer channels from the Bi3+to the Tb3+ions. The investigation of the underlying mechanism between the intrinsic emission of Cs2NaInCl6NCs and the narrow green PL caused by lanthanide ion doping in this paper will facilitate the development of lead-free halide perovskite NCs.Keywords:lead-free double perovskite;lanthanide ion doping;Cs2NaInCl6;nanocrystals
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 2
·1333-1343
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IF 4.186
Jie Fu,Liuyan Zhou,Yanling Chen,Jianhua Lin,Renguang Ye,Lei Lei,Yang Shen,Degang Deng,Shiqing Xu
Here, Bi 3+ , Er 3+ co-activated gadolinium phosphors with multimode emission properties are prepared, which can emits blue, green, and orange light under the excitation of ultraviolet, 980 and 1550 nm, respectively. Moreover, BaGd 2 O 4 :Bi 3+ , Er 3+ can show multicolor luminescence under different excitation conditions, such as pump light source, ambient temperature, working current, and other factors. Based on the dynamic luminescence characteristics, the dynamic anti-counterfeiting experiments are designed based on the phosphor. At the same time, the material also shows multimode temperature sensing characteristics. Under the excitation of 980 nm laser, three strong up-conversion signals Er 3+ ions are generated at 528 nm ( 2 H 11/2 ), 555 nm ( 4 S 3/2 ), and 668 nm ( 4 F 9/2 ), which have different temperature dependences. Based on the fluorescence intensity ratio between thermal-coupled energy levels ( 2 H 11/2 / 4 S 3/2 ) and nonthermal-coupled energy levels ( 2 H 11/2 / 4 F 9/2 ) of Er 3+ ions, respectively, the dual-mode temperature thermometer was constructed with high-temperature sensitivity. In addition, the fluorescence lifetime of Bi 3+ ions also has a strong temperature dependence, which can be used as another temperature detection signal, greatly improving the stability of thermometers under harsh conditions. Therefore, the material has a bright prospect in the field of anti-counterfeiting and temperature sensing.
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Journal of Physical Chemistry C
·
2021
·
IF 4.126
Qiaohui Liao,Qian Meng,Liang Jing,Jiamin Pang,Qi Pang,Jin Zhong Zhang
In this study, a facile approach is used to enhance the broad orange emission efficiency and stability as well as monodispersity of Cs2AgInCl6 nanocrystals (NCs) via doping Bi3+ and surface passivation with potassium bromide. While the pristine Cs2AgInCl6 NCs show an excitonic absorption peak at 280 nm, the doped NCs have an additional absorption peak at 365 nm, which is attributed to direct bismuth s–p transition. Compared to the low photoluminescence (PL) quantum yield (QY) of 0.04% for the pristine Cs2AgInCl6 NCs due to parity forbidden transition, the doped NCs show a PLQY of 5.82%, a significant improvement due to breaking of the parity forbidden transition. The PLQY can be further increased to 8.59% for Cs2AgIn0.9Bi0.1Cl6 when passivated with KBr. This work demonstrates that the combination of doping and surface passivation can substantially improve the PL of the Cs2AgInCl6 double perovskite. A model is proposed to explain the observed enhancement in PL and stability.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jiawen Wang,Ruoshan Lei,Shilong Zhao,Feifei Huang,Degang Deng,Shiqing Xu,Huanping Wang
Rigorous temperature measurement employed to characterize physic-chemical state has compelled scientists to explore more novel materials for contactless optical thermometry, which must overcome the drawbacks of low sensitivity and poor signal discriminability. Here, a novel dual-mode optical thermometer La 2 ZnTiO 6 : Bi 3+ /Eu 3+ is designed, prepared and characterized via XRD , XPS , EPR, SEM, EDS , PL spectra and decay time. Under 350 nm excitation, the energy transfer process from Bi 3+ to Eu 3+ allows the samples to demonstrate adjustable multi-color emissions. The temperature-dependent emission spectra display that the luminescence intensity of Bi 3+ ions decreases quite faster than that of Eu 3+ ions with temperature, leading to a significant chromaticity shift (∆E = 224 ×10 −3 in 293–473 K) visible to naked eyes. Based on fluorescence intensity ratio of Eu 3+ versus Bi 3+ (FIR = I Eu /I Bi ), the sample shows the maximum relative sensitivity (S r ) of ~1.50% K −1 at 293 K and excellent signal discriminability. Meanwhile, the 5 D 0 → 7 F 2 transition of Eu 3+ ions shows a thermal-responsive lifetime with the optimal S r of 1.23% K −1 at 573 K. This work suggests that the La 2 ZnTiO 6 : Bi 3+ /Eu 3+ double perovskite phosphor has a great potential for dual-mode optical thermometry, being beneficial to obtain precise, sensitive and reliable temperature detection.
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DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 43
·15231-15237
·
IF 4.174
Guodong Zhang,Yi Wei,Peipei Dang,Hui Xiao,Dongjie Liu,Xinke Li,Ziyong Cheng,Jun Lin
Double perovskites have attracted wide attention due to their low toxicity and good thermal stability. Doping with active elements is a promising method to endow perovskites with excellent optical, electrical or magnetic properties. Herein, a facile aqueous solution method is developed to synthesize Bi3+–Yb3+ co-doped Cs2Na0.6Ag0.4InCl6 double perovskite. Besides the intrinsic warm white self-trapped exciton (STE) emission that originated from the Cs2Na0.6Ag0.4InCl6 host, the samples also exhibit a strong near-infrared emission assigned to the 2F5/2 → 2F7/2 transition of octahedral coordinated Yb3+ ions upon excitation with ultraviolet light. The optimized sample shows a markedly high photoluminescence quantum yield of 84.7%. The photophysical studies such as photoluminescence (PL) and photoluminescence excitation spectra, temperature-dependent PL spectra, and PL decay curves reveal that the strong Yb3+ emission is attributed to the energy transfer from STEs to the Yb3+ ions. Finally, the lead-free double perovskite phosphor-converted LED containing visible and NIR regions was fabricated, with 8.92 mW output power at 100 mA drive current. The results show the great potential of the as-prepared crystals in optoelectronics applications.
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Advanced Optical Materials
·
2025
·
IF 7.2
Wenqian Xu,Xiangyu Zhang,Yuqiang Wang,Dingjun Jia,Dangli Gao
Persistent luminescence (PersL) materials hold immense potential for information storage and anti-counterfeiting applications. However, realizing non-volatile optical memory remains challenging. Herein, we design Mg 2 GeO 4 :Bi 3+ ,Ln 3+ (Ln = Tb, Eu) PersL phosphors via non-equivalent substitution engineering, where Bi 3+ and Ln 3+ ions deliberately occupy non-equivalent Mg1/Mg2 sites to create bistable deep traps. This strategy generates an ultra-broadband, high-density trap distribution, enabling strong photo/thermo-stimulated luminescence for recalling excitation-field temperatures. The trapped carriers exhibit temperature-dependent storage and release dynamics, allowing reconstruction of excitation thermal histories. Based on this unique behavior, reconfigurable optical memory anti-counterfeiting patterns in phosphor films are demonstrated. The trapping mechanism, validated by thermoluminescence and XPS spectra, reveals that carrier redistribution follows Fermi-Dirac statistics governed by the interaction between trap levels and thermal lattice waves. This work opens new avenues for non-volatile optical data storage with high security and spatiotemporal resolution.
研究领域:
材料科学
·
光学存储
·
发光材料
·
固态物理
·
信息安全
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Laser & Photonics Reviews
·
2024
·Vol. 18
·期 11
·2400283
·
IF 9.8
Xuexia Chen,Ran Pang,Shangwei Wang,Tao Tan,Jiangyue Su,Weihong Yuan,Su Zhang,Hongjie Zhang
Traditional anti-counterfeiting luminescent phosphors are usually composed of single-mode photoluminescence materials, which greatly limits the security of encryption by its static fluorescent pattern. Herein, multi-mode luminescence properties are achieved including fluorescence and persistent luminescence (PersL) within single host by co-doping Bi 3+ and Eu 3+ in CaNaSb 2 O 6 F (CNSOF). A tunable emission is observed from blue (Bi 3+ , 3 P 1 → 1 S 0 ) to white and then to orange-yellow (Eu 3+ , 5 D 1 → 7 F 2 and 5 D 0 → 7 F 0, 1, 2, 3, 4 ) as the excitation schemes, environment temperatures and doping level are modulated. Impressively, the blue emission attributed to the Bi 3+ rapidly disappears after stopping the excitation light irradiation, and only the intense orange-yellow PersL produced by Eu 3+ can be observed. And a possible model for the energy transfer and PersL mechanism is proposed by the investigation crystal structure and photoluminescence/PersL. A schematic of security logo and digital information encryption is demonstrated using the prepared samples, which shows the dynamic evolution of the emission color and PersL brightness. The excellent property of multiple color outputs, different decay processes, and external field stimulation modes (including low energy light, thermal, and mechanical stimuli) present in CNSOF:Bi 3+ , Eu 3+ provides a fast, low-cost, and effective method for advanced anti-counterfeiting and information encryption applications.
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Advanced Optical Materials
·
2022
·Vol. 10
·期 11
·2102842
·
IF 10.05
Sheng Wu,Quan Liu,Puxian Xiong,Weiwei Chen,Quan Dong,Dongdan Chen,Dong Wang,Guoxing Zhang,Yan Chen,Guogang Li
Single-phase white luminescence phosphors are emerging for potential phosphor-converted white light-emitting diodes (pc-WLEDs) and alternatives to trichromatic phosphor blends. In this work, Ba 2 ZnWO 6 :Bi 3+ phosphors are prepared by a high-temperature solid-state reaction method and the luminescent properties are investigated. The broadband excitation from 250 to 400 nm is perfectly matched with the emission of nearly ultraviolet (n-UV) InGaN chip, which ultrabroadband emission band (full width at half maximum = 217 nm) can cover a wider luminescence region. Li + /Na + /K + codoping is more desirable for the ultrabroadband emission of Ba 2 ZnWO 6 :0.006Bi 3+ due to the charge compensation and rationally designed lattice distortion while improving the thermal stability of the phosphor. Furthermore, tunable emissions can be achieved either by changing the content of doped ions or the excitation wavelength due to the different occupation of Ba 2+ and Zn 2+ sites by Bi 3+ ions. Finally, single-phase warm WLED (( x , y ) = (0.4170, 0.4035)) devices with a correlated color temperature of 3329 K and color rendering index of Ra = 75.3 are successfully prepared using Ba 2 ZnWO 6 :0.006Bi 3+ , 0.03Na + phosphor, and 365 nm InGaN chips. These results indicate that Ba 2 ZnWO 6 :Bi 3+ has excellent potential as phosphor for n-UV pc-WLEDs and provides new ideas for the application of ultrabroadband emitting phosphors in WLEDs.
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