CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Hengjuan Deng,Xinxin Han,Xinyi Wang,Dongxi Liu,Sheng Cao,Bingsuo Zou
Multifunctional luminescent materials emiting dual white and near-infrared (NIR) radiation have broad applications in various fields, including illumination, food detection and bio-imaging. Herein, an ultra-wide spectrum ranging from 330 to 1000 nm is achieved simply by co-doping Bi 3+ and Cr 3+ into the double perovskite K 2 LiGaF 6 , enabling simultaneous emission of white and NIR light. The emission bands peaking at 475 and 750 nm correspond to the radiative transitions of Bi 3+ and Cr 3+ , respectively. Systematically studies reveal that the NIR emission of Cr 3+ originates from efficient energy transfer from Bi 3+ , with energy transfer efficiency exceeding 80 %. The energy transfer mechanism is thoroughly explained. Moreover, the red partial emission of Cr 3+ in turn compensates the missing red component in the bluish emission of Bi 3+ , contributing to the final white emission. Notably, Bi 3+ ions occupy double lattice sites of Ga 3+ and Li + , which exhibit distinct luminescence properties. The luminescence behaviors of double Bi 3+ and Cr 3+ centers at various temperatures are systematically analyzed. Finally, the combination of the as-prepared dual-emissive K 2 LiGaF 6 :Bi 3+ ,Cr 3+ phosphor and a UV chip demonstrates potential applications in illumination, food detection and bio-imaging. This work provides new perspectives for the design of multifunctional luminescent materials and their deployment in diverse application scenarios.
研究领域:
材料科学
·
生物成像
·
食品检测
✓ 已验证
产品关联
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
·
生物光子学
·
医学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 16
·4869-4880
·
IF 7
Ruiting Zhang,Yahong Jin,Yanmei Li,Haoyi Wu,Yihua Hu
Inorganic photochromic materials hold great scientific and technological promise in the field of optical information storage due to their numerous advantages, including an extended color change duration, exceptional fatigue resistance, and robust thermal stability. However, their practical application has been hindered by relatively slow coloring and bleaching rates. In this study, we present a P-type photochromic perovskite material, LiTaO3:Bi3+/Sm3+, with an ultra-fast optical response. LiTaO3:Bi3+/Sm3+ exhibits a rapid coloring time of approximately 25 seconds and an ultra-fast bleaching time of approximately 1 second, achieved through alternating 254 nm and 365 nm light irradiation. Notably, the photobleaching rate of LiTaO3:Bi3+/Sm3+ is currently the fastest among all reported inorganic photochromic materials. The prepared LiTaO3:Bi3+/Sm3+ material exhibits a maximum color change contrast of 26.49% and excellent fatigue resistance. The codopant Bi3+ plays a critical role in creating traps within the host lattice, which greatly enhances photochromism contrast and enables efficient long afterglow luminescence. These dual properties make the material suitable for dual-mode optical information storage in both bright and dark fields. Finally, the excellent optical properties of LiTaO3:Bi3+/Sm3+ are demonstrated in its application for erasable optical information storage vividly.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xiaohong Li,Jiming Dai,Xiaozhen Zhang,Huafeng Liu,Chengzhi Zhou,Renhua Chen
Non-rare earth ion-activated Yb 3+ -rich fluoride matrix luminescent materials exhibit higher absorption efficiency under near-infrared (NIR) laser excitation, and are more suitable for upconversion (UC) photoluminescence and optical heating applications. These materials are highly promising fluorescent self-labeling nano-heaters. In this work, Bi 3+ -codoped β-NaYbF 4 :Tm 3+ UC nanomaterials were synthesized by combining the hydrothermal reaction with the molten salt method. The effects of Bi 3+ doping on the crystalline phase composition, micromorphology, upconversion luminescence (UCL) properties, spectral characteristics , and optical heating performance of the synthesized materials were investigated in detail. The co-doping of 5–20 mol% Bi 3+ was found to significantly enhance the near-infrared (NIR) UCL intensity of NaYbF 4 : Tm 3+ . In particular, t he sample doped with 15 mol% Bi 3+ emitted nearly pure 801 nm monochromatic near-infrared light under 980 nm optical excitation , and its I NIR /I Blue ratio increased dramatically from 0.97 without Bi 3+ doping to 1599. This material exhibited efficient photothermal conversion capability, and the center temperature of the sample can reach ∼147.6 °C under 10 s laser irradiation, achieving a high photothermal conversion efficiency of 129.53 °C W −1 , together with excellent photothermal conversion stability. The mechanism behind the enhanced NIR emission of Bi 3+ -doped nanomaterials was also elucidated based on the energy level transition strategy.
研究领域:
材料科学
·
纳米技术
·
光学
·
发光学
·
光热治疗
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hang Zhang,Hang Yang,Guogang Li,Shiqi Liu,Haoran Li,Yuming Gong,Yujun Liang,Yongjun Chen
Currently, phosphor materials play an important role in designing noncontact remote optical thermometers. Although many approaches have contributed to improve thermometric performance of optical thermometers including optimization of host materials, size of nanoparticles , dopant type and concentration as well as excitation density and phonon energy engineering, the development of highly sensitive optical thermometric materials is still a challenge. Hence, we developed novel CaNb 2 O 6 (CNO):Ln 3+ (Ln 3+ = Eu 3+ /Sm 3+ /Dy 3+ /Tb 3+ ) phosphors as highly thermometric materials and proposed a novel strategy for further enhancing its thermometric performance via adding the intensity of indicator signal by co-doping Bi 3+ ions in current phosphor system. Typically, the as-prepared CNO:Ln 3+ phosphors present a broad blue emission around 470 nm originated from NbO 6 octahedral groups and some respective emission lines derived from the characteristic f-f transitions of Ln 3+ ions. Based on the diverse thermal quenching performance between blue emission and Ln 3+ ions emission , the temperature sensitivities of CNO:Ln 3+ were investigated in detail. Among them, the maximum relative sensitivity of CNO:Eu 3+ sample reached 1.991% K −1 in the range of 298–448 K and remained 97% after five temperature cycles. Furthermore, an obvious discoloration was discovered during temperature cycle testing in CNO:Ln 3+ samples under 254 nm UV lamp. Through doping Bi 3+ ion, the strongest intensity of indicator signal is 24 folds that of CNO host. Correspondingly, the relative sensitivity of CNO:Bi 3+ , Eu 3+ sample is obviously improved to 3.793% K −1 in the range of 298–523 K, owing to a larger range of the FIR value and a wider drop range of indicator signal. This work opens up an effective pathway to improving thermometric performance of optical thermometers by enhancing the intensity of indicator signal of employed phosphor materials.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 46
·2207881
·
IF 19.924
Jingna Jia,Xuwen Gao,Guizheng Zou
The self-activated mechanoluminescence (ML) of oxysulfides MZnOS (M = Ca, Sr, Ba) is very weak, and bright ML from these hosts is usually achieved with activator-doping strategy. Herein, a promising alkaline-earth-metal-ion blending strategy, instead of activator doping, is proposed to achieve intense and self-activated ML from MZnOS. Upon partially substituting the Ca 2+ of CaZnOS with Ba 2+ and vice versa, intense and eye-visible ML is achieved via exerting a small mechanical stimulus of 2 N onto the obtained Ca 1-x Ba x ZnOS (0 < x < 1). The luminescence center for ML of Ca 1-x Ba x ZnOS is intrinsic oxygen vacancy, so that Ca 1-x Ba x ZnOS can give off efficient and self-activated ML. Under optimum conditions, the maximum ML emission of Ca 0.84 Ba 0.16 ZnOS is about 50-folds and 170-folds to that of CaZnOS and BaZnOS, respectively. Promisingly, Bi 3+ can be incorporated into the lattice of Ca 1-x Ba x ZnOS, transferring ML center from the oxygen defects of Ca 1-x Ba x ZnOS to the activator of Ca 0.96-x Ba x ZnOS:Bi 0.04 , and eventually enable further enhanced ML by about twofolds. This alkaline-earth-metal-ion blending strategy can also enhance Bi 3+ -activated ML from M 0.96 ZnOS:Bi 0.04 , the maximum emission for ML of Ca 0.80 Ba 0.16 ZnOS:Bi 0.04 is 36-folds and 38 folds to that of Ca 0.96 ZnOS:Bi 0.04 and Ba 0.96 ZnOS:Bi 0.04 , respectively. This work opens an avenue to develop new ML hosts and luminophores with efficient emission.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Applied Electronic Materials
·
2019
·
IF 0
Wei Yan,Shuoting Chen,Yixin Liu,Zhiyu Gao,Yi Wei,Guogang Li
High-performance and thermally stable phosphors play an important role in high-quality white light-emitting diode (pc-WLED) lighting. In this work, we proposed a cation substitution strategy to improve the luminescence performance of blue-emitting Bi3+-doped Ca4ZrGe3O12 (abbreviated as CZGO) phosphor. As expected, the introduction of Sr2+ and Si4+ can improve photoluminescence intensity and thermal stability. The photoluminescence intensity can be increased by 6.7 times. The internal quantum efficiency (IQE) can achieve 88.1%. Based on Rietveld refinement results, the corresponding enhancement mechanism is ascribed to the local lattice modification and the improved structure rigidity. In addition, controllable color tuning from blue to red light is successfully realized through designing Bi3+ → Eu3+ energy transfer. The energy transfer efficiency (ηT) is 0.55 in CZGO:2% Bi3+, 15% Eu3+ phosphor. The energy transfer mechanism is discussed in detail. The prototype pc-WLEDs with blue/red dual-emitting CZGO:2% Bi3+, 10% Eu3+ possess a high color rendering index (CRI = 90.8) and low correlated color temperature (CCT = 4372 K). The above investigations indicate that CZGO:Bi3+ and CZGO:Bi3+, Eu3+ are promising blue-to-red tunable phosphor candidates for pc-WLED applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yiping Wu,Meng Wu,Jingjie Yu,Yuru Wang,Jinlong Wang,Yingwei Xu,Yanjie Zhang
Optical information encryption based on luminescence materials have received much attention recently. However, the single luminescence mode of the luminescence materials greatly limits its anti-counterfeiting application with high safety level. Here, a series of luminescence materials of Tb 3+ and Bi 3+ co-doped ZnGa 2 O 4 phosphors with great correspondence in photoluminescence (PL), persistent luminescence (PersL), and thermoluminescence (TL) modes was synthesized by the conventional solid-phase method for the application in multi-modal anti-counterfeiting fields. Under the excitation of 254 nm, ZnGa 1.99 O 4 :0.01 Tb 3+ , yBi 3+ (y = 0.001,0.002) sample exhibited a broad blue emission band (the transition from [GaO 6 ]) at 440 nm and the characteristic emission peaks of Tb 3+ at 495 nm, 550 nm, 591 nm and 625 nm, corresponding to the transitions of 5 D 4 - 7 F n (n = 6, 5, 4, 3), respectively. Interestingly, the co-doping of Bi 3+ ions improve the crystallinity and particle size of the phosphor, subsequently enhanced the PL intensity of Tb 3+ to 6 times that of Tb 3+ singly doped ZnGa 2 O 4 phosphor. Further, the flexible films with multi-modal luminescence properties have been fabricated through the unique TL and PersL characteristics of ZnGa 2 O 4 : Tb 3+ , Bi 3+ phosphors, including “Optical information storage film”, “snowflake and characters” and “QR code”. Moreover, a set of optical information encryption is obtained by combining ZnGa 2 O 4 :Tb 3+ , Bi 3+ phosphor and red emitting phosphor. The results indicate that ZnGa 2 O 4 :Tb 3+ , Bi 3+ phosphor with multi-modal stimulus response can be expected to be potentially used in the applications of optical information storage and anti-counterfeiting fields.
研究领域:
材料科学
·
光学工程
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Peng Liu,Yuchi Zhang,Bohan Li,Le Han,Yan Xu
Anti-counterfeiting and encryption are key technologies for information transmission in modern society. Whereas, most optical materials reported only provide single luminous color and fixed response mode, which limits their safety in advanced anti-counterfeiting applications. In this work, we reported a Bi 3+ -assisted trap depth engineering strategy to achieve a dual-mode dynamic photoluminescence response of MgGa 2 O 4 : Bi 3+ with intriguing anti-counterfeiting and encryption performances. Upon the ultraviolet (UV) of 254 nm irradiation for 20 s, the color of MgGa 2 O 4 : x% Bi 3+ (x = 0, 1.0, 2.0, 3.0, 5.0) samples showed dynamic transformation from green or near-infrared to bluish-white emission. Combined with the dynamic photoluminescent (PL) behavior of MgGa 2 O 4 : 2.0% Bi 3+ , high-level dynamic anti-counterfeiting and encryption properties of MgGa 2 O 4 : Bi 3+ for tagging spies were investigated through powder filling followed by a masked screen printing method. On the other hand, the fluorescence intensity ratios (FIR) of I 430 nm /I 500 nm and I 430 nm /I 709 nm for MgGa 2 O 4 : 2.0% Bi 3+ showed excellent temperature-dependent quenching behaviors in the temperature range of 283 to 393 K, and the relative temperature sensitivities for FIR of I 430 nm /I 500 nm and I 430 nm /I 709 nm are 2.18% and 2.98% K −1 at 283 K, respectively. These results inspired more flexible designs to safeguard information security and develop novel high-efficiency optical temperature detectors.
研究领域:
材料科学
·
光学
·
信息安全
·
温度传感
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 42
·15413-15421
·
IF 4.39
Jingwei Liu,Yanjie Liang,Shao Yan,Dongxun Chen,Shihai Miao,Weili Wang
Luminescent materials that emit in the narrowband ultraviolet-B (NB-UVB; 310–313 nm) spectral region have attracted considerable attention due to their unique spectral features, which endow them with great potential applications in the fields of photochemistry and photomedicine. However, NB-UVB persistent luminescent materials are relatively lacking, especially materials that are excitable by natural sunlight. Here we report the NB-UVB persistent luminescence of Gd3+ in (Y,Gd)3Ga5O12:Bi3+ garnets by making use of the persistent energy transfer from Bi3+ to Gd3+. The optimal Bi3+ and Gd3+ concentrations for the maximum energy transfer efficiency are determined and persistent NB-UVB light emission with a peak wavelength at 313 nm and an afterglow time of more than 24 h is successfully achieved in the (Y,Gd)3Ga5O12:Bi3+ phosphor. More importantly, the as-synthesized NB-UVB persistent phosphors are also excitable by the widely available natural sunlight and exhibit exceptional NB-UVB persistent luminescence performance. Benefitting from the visible-blind emission feature, interference-free capability from indoor ambient light and self-sustained optical characteristic, the developed sunlight-excitable NB-UVB persistent phosphors here not only hold great promise for covert optical tagging applications, but also open new opportunities for optical data storage in a bright indoor environment.
研究领域:
材料科学
·
光物理学
·
生物医学工程
·
光学成像
·
药物递送系统
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Guang-Xuan Zhang,Qiao-Yun Yin,Bing Wang,Li-Ying Liu,Li-Yuan Chang,Ru-Zhi Wang
All-inorganic lead-containing perovskites have shown strong luminescence, but the use of lead has hindered their commercial development due to its stability and toxicity. In this paper, we propose thermal precipitation in ionic liquids (ILs) for synthesizing Bi 3+ -doped Cs 2 ZrCl 6 double perovskites (Cs 2 ZrCl 6 :Bi 3+ (ILs)), which have a better crystallinity compared to the Cs 2 ZrCl 6 :Bi 3+ (HCl) synthesized by the traditional hydrochloric acid method. Most interestingly, the Cs 2 ZrCl 6 :Bi 3+ (ILs) exhibits ultra-high photoluminescence quantum yield (PLQY) of up to 78.52%, which is about three times higher than the Cs 2 ZrCl 6 :Bi 3+ (HCl) prepared by the traditional method. In addition, the PLQY of this paper is the highest in the reported works for the Cs 2 ZrCl 6 :Bi 3+ . It has been confirmed that the high PLQY of Cs 2 ZrCl 6 :Bi 3+ (ILs) is due to the interaction force between N atoms and perovskites in ionic liquid cations, and the cations in ionic liquids can improve the crystallinity of Cs 2 ZrCl 6 :Bi 3+ (ILs) double perovskite crystallites by passivating shallow defects. The research provides an alternative and efficient method for synthesizing stable lead-free double perovskites with good optical properties.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Optical Materials Express
·
2016
·Vol. 6
·期 11
·3574-3585
·
IF 2.657
X. Y. Liu,H. Guo,S. X. Dai,M. Y. Peng,Q. Y. Zhang
In this paper, novel Bi3+/Eu3+ co-doped white-emitting germanium-borate glasses were successfully prepared by the melt-quenching method. Their luminescent properties were evaluated using the transmission spectra, photoluminescence excitation, and emission spectra (with a temperature range of 298-573 K), and lifetime decay curves. Due to the efficient energy transfer from Bi3+ to Eu3+, tunable emitting color between the bluish-green and the orange-red region has been obtained by varying the content of Eu3+ (0-7%). Interestingly, a perfect white-light emission with CIE coordinates (X = 0.356, Y = 0.325) is realized upon the excitation at 345 nm light in the Bi3+/Eu3+ co-doped sample. More remarkably, the white-light emission glass maintains excellent color stability even at 423 K. Our results indicate that the Bi3+/Eu3+ co-doped germanium-borate glasses may be used as a potential single-phased white light-emitting matrix material for the UV converted organic-resin-free WLEDs in the future.
研究领域:
材料科学
·
光学
✓ 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）