Materials Research Express
·
2023
·Vol. 10
·期 11
·116202
·
IF 2.3
Yifan Yang,Yongqi Zhu,Shuang Wu,Xinyue Li,Qinan Mao,Yifan Chen,Jiasong Zhong,Yiwen Zhu
In this study, a series of near-infrared (NIR) KZnF3:Cr3+ phosphors was prepared by different chromium sources using a HF-free hydrothermal method. The influence of different chromium sources on the crystal structure, morphology, and luminescence properties of Cr3+-doped KZnF3 phosphors were systematically investigated. The results showed that the chromium source changed from CrF3·xH2O to (NH4)3CrF6 and leaded to an increased crystal field, resulting in a blue shift of the emission peak position from 803 nm to 753 nm, accompanied by the full-width half maximum (FWHM) reduced from 140 nm to 122 nm. Moreover, KZnF3:0.03Cr3+ (CrF3·xH2O) and KZnF3:0.03Cr3+ ((NH4)3CrF6) phosphors maintained 58% and 87% of their initial room-temperature intensity at 423 K, respectively. These results indicated that altering the synthetic raw materials provided new insights for designing NIR phosphors with highly thermal stability.
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高影响因子
Nanoscale
·
2020
·Vol. 12
·期 26
·14180-14187
·
IF 6.895
Luyan Wu,Jie Hu,Qilin Zou,Yaling Lin,Decai Huang,Dejian Chen,Hongyu Lu,Haomiao Zhu
Persistent luminescence nanophosphors (PLNPs) emitting in the second near-infrared window (1000–1700 nm, NIR-II) are emerging as one promising class of in vivo bio-imaging agents due to their unique advantages including non-autofluorescence and low optical scattering in tissues. Currently, it remains a great challenge to synthesize nanosized lanthanide-doped inorganic NIR-II phosphors with a good persistent luminescence performance. Herein, we present a salt microemulsion method for synthesizing Ce3+, Cr3+, Nd3+ codoped Y3(Al/Ga)5O12 nanocrystals, which generate multi-wavelength persistent luminescence in the visible (∼508 nm, 5d1 → 4f of Ce3+), the first near-infrared window (∼890 nm, 4F3/2 → 4I9/2 of Nd3+) and NIR-II (∼1063 nm, 4F3/2 → 4I11/2 of Nd3+) regions. Under illumination of a 410 nm diode (3 W) for 10 min, the observed duration time of NIR-II persistent luminescence is as long as 60 min at room temperature. Moreover, the persistent luminescence can be excited efficiently by multiple excitation sources including a blue diode, white LEDs and an X-ray generator, which is crucial for deep tissue imaging applications. By comparing the penetration depth between NIR-I and NIR-II persistent luminescence through chicken breast, we prove that NIR-II photons exhibit a deeper optical penetration length (3.9 mm) than that of the NIR-I ones (2.5 mm). In addition, the NIR signals can still be detected 3 min after ceasing the excitation source by a small animal imaging system (InGaAs detector) when the thickness of the covering chicken breast is 20 mm. These results show great promise for Y3(Al/Ga)5O12:Ce3+,Cr3+,Nd3+ nanocrystals as a PLNP for bio-imaging applications with deep penetration depth and a high signal-to-noise ratio.
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PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 20
·7098-7109
·
IF 6.1
Fengmei Zhu,Yuan Gao,Jianbei Qiu
Presently, there is a need to expand the near-infrared (NIR) emission range, especially in the bio-transparent window, to improve the internal quantum efficiency and external quantum efficiency, and to minimize the shortcomings of luminescence properties. In this work, an ultra-broadband NIR emission Cr3+-doped Cs2NaLuCl6 all-inorganic metal halide perovskite phosphor was synthesized by a grinding–sintering method. Under 300 nm excitation, Cs2NaLuCl6:Cr3+ phosphors exhibited ultra-broadband NIR emission of 800–1400 nm, which covers nearly the entire NIR-I (700–1000 nm) and NIR-II (1000–1400 nm) regions; the emission peaked at around 960 nm, with a full width at half maximum of ∼182 nm. Noticeably, the internal- and external-quantum efficiencies of the optimized Cs2NaLuCl6:Cr3+ phosphor were as high as ∼92.9% and ∼60.75%, respectively. We showed through analysis and simulation that the weak crystal field strength is conducive to increasing the odd term of the crystal field, and therefore it partially released the restriction imposed by the parity prohibition law and improved the energy absorption efficiency of Cr3+. As the size of the phosphor approaches the wavelength of NIR luminescence, the apparent Mie scattering effect starts to take effect, which enhances the light extraction of NIR luminescence in the radial direction.
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LUMINESCENCE
·
2024
·Vol. 39
·期 11
·1-8
·
IF 3.2
Zhigang Wang,Jiayu Wang,Dangli Gao,Wenqian Xu,Wenna Gao,Xiangyu Zhang,Sining Yun,Xiaojun Wang
Double wavelength emitting phosphors with hypersensitive thermal response are important for optical/thermal sensors and multiplexing optical data storage technology. However, it is a daunting challenge to develop multicolor electron-trapping materials with superheat sensitivity and anomalous quenching luminescence characteristics for information storage. Here, based on the selection of host lattice and the control of doping ion types, we have designed Mn 2+ - and/or Cr 3+ -activated persistent materials with excellent fluorescence properties. Among these phosphors, Mn,Cr co-activated biphasic mixture exhibits not only sensitive anomalous thermosensitive fluorescence properties but also multicolor and multimode fluorescence emission characteristics derived from Mn and Cr simultaneously. The corresponding multimode fluorescence mechanism is proposed based on afterglow energy transfer and deepening trap effect. Especially, based on the excellent fluorescence performances, these phosphors as information storage medium demonstrate multilevel information storage by a combination of the trap multiplexing and wavelength multiplexing technologies. The study here provides not only the ideas for designing and synthesizing new electronic materials but also a material foundation for the fourth generation of optical information storage and encryption.
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PubMed
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 9
·4214-4221
·
IF 3.5
Geng Chen,Lifang Yuan,Chaoyue Peng,Haoyi Wu,Yahong Jin
Recently, short-wave infrared (SWIR) phosphor-converted light-emitting diodes (pc-LEDs) have garnered increased attention due to their widespread applications in night vision, biological imaging, and non-destructive testing. Nevertheless, the currently used SWIR phosphors suffer from poor thermal stability and low quantum efficiency. In this study, a finely tuned spinel-based solid solution, Mg0.5Zn0.5Ga2O4, is prepared to host Ni2+ to induce SWIR emission. Cr3+ is codoped as a sensitizer to bridge Cr3+ and Ni2+ ions, significantly enhancing blue light absorption and facilitating energy transfer (ET) to Ni2+ ions. The champion SWIR phosphor exhibits a broadband emission centered at 1304 nm with a full width at half maximum (FWHM) of 250 nm, achieving a near-unity internal quantum efficiency (IQE = 97.7%) and a good thermal stability (70.7%@423 K). The fabricated SWIR pc-LED device delivers a high SWIR output power of 39.9 mW at 360 mA, enabling its application in non-destructive imaging and testing.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhuojia Xie,Xiuxin Zheng,Wenbin He,Min Feng,Changji Xu,Zhengguang Zou
The investigation focused on the impact of Cr 3+ incorporation on structural features, surface morphology, and the magnetocaloric effect in La 0.8 Sr 0.2 Mn 1- x Cr x O 3 ceramics, with x values of 0.05, 0.10, and 0.15, employing both experimental methods and theoretical simulations. Synthesis of La 0.8 Sr 0.2 Mn 1- x Cr x O 3 ceramics was achieved using the sol-gel method. Analyses via transmission electron microscopy and X-ray diffraction confirmed that La 0.8 Sr 0.2 Mn 1- x Cr x O 3 ceramics possess a rhombohedral crystal structure, corresponding to space group No.167 (R-3c). Scanning electron microscopy revealed that La 0.8 Sr 0.2 Mn 1- x Cr x O 3 ceramics comprise irregular ellipsoidal particles. The average particle size ranged from 173 nm to 226 nm. XPS confirmed the presence of all elements in La 0.8 Sr 0.2 Mn 1- x Cr x O 3 ceramics. Mixed valence states of Mn (Mn 3+ /Mn 4+ ) and Cr (Cr 3+ /Cr 4+ ) were identified, with Sr at +2 and La at +3. The Tc of La 0.8 Sr 0.2 Mn 1- x Cr x O 3 ceramics ( x = 0.05, 0.10, 0.15) were determined using a Magnetic Property Measurement System to be 301 K, 278 K, and 253 K, respectively. A decrease in Tc with increasing Cr 3+ doping was observed. Analysis of isothermal magnetization and Arrott plots reveals that La 0.8 Sr 0.2 Mn 1- x Cr x O 3 ceramics undergoes a second-order transition from paramagnetism to ferromagnetism. It was found that the net magnetic moment (The vector sum of all magnetic moments) and magnetic entropy change of La 0.8 Sr 0.2 Mn 1- x Cr x O 3 ceramics decreased with increasing of Cr 3+ doping. For samples with a chromium doping level of x = 0.05, the Tc is recorded at 301 K. At this doping concentration, the peak magnetic entropy change is observed to be 3.50 J/(kg K) (H = 5 T).
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Advanced Optical Materials
·
2023
·Vol. 12
·期 12
·2302611
·
IF 9
Yining Wang,Mengmeng Shang,Yixin Sun,Yiying Zhu,Xiaole Xing,Peipei Dang,Jun Lin
The development of the new generation of smart near infrared (NIR) light sources is a problem demanding prompt solution with the increasing role of NIR spectroscopy in security, food, medical treatment, agriculture, and other fields. In this work, Cr 3+ doped ANb 2 O 6 (A = Zn/Mg) phosphors are successfully developed, which generate a NIR emission with a peak at 930 nm covering 750–1300 nm under excitation of 515 nm light. Thanks to the small Stokes shift, the internal quantum efficiency (IQE) values of the optimal samples of ZnNb 2 O 6 :Cr 3+ and MgNb 2 O 6 :Cr 3+ reach up to 70% and 62%, respectively. This ultra-broadband NIR emission originates from the simultaneous occupation of [AO 6 ] and [NbO 6 ] octahedrons by Cr 3+ , which is confirmed by the excitation wavelength-dependent emission spectra, low-temperature photoluminescence spectra (77 K), time-resolved photoluminescence (TRPL) spectra, and density functional theory (DFT) calculation. The thermal quenching mechanism of ANb 2 O 6 :Cr 3+ (A = Zn/Mg) is revealed from the aspects of thermal cross and thermal ionization. Benefiting from the excellent performance of ANb 2 O 6 :Cr 3+ (A = Zn / Mg) NIR phosphors, the combination of 520 nm LED chips, and as-prepared phosphors demonstrate the dramatic potential applications in night vision, non-destructive testing, biological tissue imaging, and spectral analysis.
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高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yu Yan,Mengmeng Shang,Shuai Huang,Yining Wang,Yixin Sun,Peipei Dang,Jun Lin
Near-infrared (NIR) phosphors are fascinating photoluminescence materials with applications in phosphor-converted light-emitting diodes (pc-LEDs) for night vision lighting, which are still restricted by low efficiency and thermal stability in the current research stage. In this work, AScSi2O6 (A = Na/Li) are chosen as hosts due to a larger band gap and a single octahedral site for Cr3+ doping. The NIR-emitting Cr3+-activated AScSi2O6:Cr3+ phosphors were successfully prepared by a common high-temperature solid-state method. X-ray diffraction and Rietveld refinement confirm that the Cr3+ prefers to enter the Sc3+-octahedral lattice site in the AScSi2O6 structure. Under blue light excitation, AScSi2O6:Cr3+ phosphors exhibit broadband NIR emission from 700 to 1100 nm with a full width at half-maximum of ∼150 nm owing to the 4T2 → 4A2 electron transition of Cr3+. The photoluminescence properties were enhanced by adjusting the fluxes and sintering conditions, and highly efficient LiScSi2O6:Cr3+ NIR phosphors with external quantum efficiencies of 33.4% were obtained. Moreover, the optimized LiScSi2O6:Cr3+ exhibits excellent thermal stability (75% at 150 °C) with an activation energy of 0.33 eV. Importantly, the fabricated NIR pc-LED with the highly efficient LiScSi2O6:Cr3+ phosphor demonstrates brighter NIR light and a higher luminous efficacy than the NaScSi2O6:Cr3+ phosphor in night vision.
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RSC Advances
·
2014
·Vol. 4
·期 86
·46332-46339
·
IF 3.708
TongMou Geng,RongYi Huang,DaYu Wu
A new monomeric fluorophore N-acryl-N′′-(rhodamine B-yl) diethylenetriamine (ARBD) was synthesized. Free radical precipitation copolymerization was carried out in order to prepare a water-soluble fluorescent copolymer (poly(AM–ARBD)), based on acrylamide. The chemical constitution of poly(AM–ARBD) was studied by FTIR and 1H NMR spectroscopy. The fluorescent characteristic of the aqueous solutions of the copolymer was investigated both in varied pH and in the presence of metal cations. It was found that polymeric sensors exhibited high selectivity and sensitivity in colorimetric and fluorescence responses toward Fe3+ and Cr3+ over other metal ions. The polymeric sensors were non-fluorescent in the spirolactam form and could be selectively converted into the fluorescent ring-opened amide form in the presence of Fe3+ or Cr3+ ions that lead to fluorescence enhancements and colorimetric changes from colorless to red or pink, respectively. Fe3+ and Cr3+ can be sensed with a detection limit at 1.34 × 10−4 and 9.90 × 10−6 mol L−1, respectively. The combination of water solubility and positive fluorescence response as well as color change is therefore particularly promising for the practical utility of this sensor.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yi-Fan Gao,Rui Zou,Guang-Feng Chen,Bo-Mei Liu,Yong Zhang,Ju Jiao,Ka-Leung Wong,Jing Wang
Featured with excellent biocompatibility and background-free biomedical imaging, near infrared persistent luminescence (NIR-PersL) nanomaterials synthesized by mesoporous silica nanoparticles (MSNs) template have captured increasing attentions to be as a tumor theranostic nanoplatform. Unfortunately, many researches in the past decades have mainly focused on bioimaging performance of NIR-PersL nanomaterials themselves but not synergistically on tailoring the pore volume of the MSNs to optimize the drug loading/releasing performance, which greatly limits their potential application in tumor theranostics. In this work, we propose a tailorable large-pore mesoporous-silica-assisted synthesis strategy to synthesize a series of ZnGa 2 O 4 :Cr 3+ /Sn 4+ @MSNs (ZGOCS@MSNs) NIR-PersL nanospheres as nanoplatform. The ZGOCS@MSNs possess average diameters of ~ 80 nm. More interestingly, the mass ratio of ZGOCS to MSNs (MRZM) increases with the increasing of pore sizes of MSNs and the NIR-PersL performances of ZGOCS@MSNs enhance with the increase of MRZM, suggesting that MRZM plays an important role in optimizing NIR-PersL performance of the nanospheres. In vitro and in vivo NIR-PersL imaging further confirm the MRZM-dependent performance enhancement in NIR-PersL nanospheres. More importantly, the employment of large pore MSNs maintains the mesoporous structure of NIR-PersL nanospheres and the residual pore volume of ZnGa 2 O 4 :Cr 3+ /Sn 4+ @MSNs is high enough and available for efficient drug loading/releasing. Benefited from excellent rechargeable tumor NIR-PersL imaging ability and large residual cavities, ZGOCS@MSNs show high dose (~53%) of loading DOX and exhibit outstanding cancer cell killing efficiency, implying the MRZM also plays an important role in optimizing the drug loading/releasing performance of the nanospheres. In summary, the as-synthesized high performance ZnGa 2 O 4 :Cr 3+ /Sn 4+ @MSNs bi-functional nanoplatform showcases its great potential for imaging-guided cancer chemotherapy. We expect our work could take the development of NIR-PersL-based theranostic nanoplatforms a step forward.
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