JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Junqian Zhao,Huaina Yu,Shusheng Pan,Shang Zhou,Li Zhong,Hua Wang,Yuan Yuan Luo,SiuFung Yu,Guanghai Li
CsPbI 3 sub-micrometer wires were synthesized by one-pot solution method at near room temperature . The wires are single crystalline with [100] orientation. An strong emission band centered at 470 nm was observed under ultraviolet excitation, and the emission intensity and bandwidth are dependent on the molar ratio of CsI/PbI 2 in the wires. A bright green emission with a lifetime of several tens ns was observed when excited with a soft X-ray, and the spectral response range can be modulated by the molar ratio of CsI/PbI 2 in the wires. The growth mechanism of the wires was discussed, and the influences of the cycling strain and X-ray irrigation time on the X-ray excited optical luminescence of the CsI/PbI 2 wires/PET film were analyzed and discussed.
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 ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xiaoqian Dong,Zhibin Chen,Lehui Liu,Feifei Yuan,Yisheng Huang,Lizhen Zhang,Zhoubin Lin
Broadband near-infrared (NIR) phosphors play a crucial role in the development of next-generation smart NIR light sources based on blue light-emitting diodes (LEDs). The emission bandwidth is an important parameter for evaluating the performance of these phosphors. Herein, an ultra-broadband NIR phosphor CaMgSi 2 O 6 :Cr 3+ (CMSO:Cr), with a tunable emission band and a full width at half maximum (FWHM) ranging from 138 nm to 393 nm, is obtained by adjusting the doping concentration of Cr 3+ . In the low-concentration doped sample, a single emission peak at 785 nm is observed. When the concentration of Cr 3+ exceeds 1.0 at%, emissions at both 785 nm and 980 nm are detected. The emission peak at 785 nm originates from the [MgO 6 ](Ⅰ) octahedron within the CMSO structure. On the other hand, the emission peak at 980 nm is attributed to the presence of a twisted octahedron [MgO 6 ](Ⅱ), which is caused by defects and vacancies resulting from the charge imbalance when Mg 2+ ions are replaced by Cr 3+ ions. The Cr 3+ ion primarily occupies the [MgO6](Ⅰ) site in the lower-concentration doped sample, which explains the photoluminescence peak at 785 nm. With the increase in the concentration of Cr 3+ ions, more and more Cr 3+ ions preferentially occupy the [MgO 6 ](Ⅱ) octahedral sites, leading to the broad emission at 980 nm. A novel NIR phosphor light source was fabricated by combining a blue chip with CMSO:Cr phosphor. Driven by a current of 60 mA, the NIR light output power of 5.89 mW and 0.76 mW is achieved by using CMSO:0.015Cr and CMSO:0.04Cr, respectively. This work demonstrates that new luminescent centers can be generated by substituting heterovalent ions, resulting in broadened emission spectra.
研究领域:
材料科学
·
光电
·
光子学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 6
·3446-3454
·
IF 3.9
Zhicong Sun,Tianliang Zhou,Ronghui Liu,Xueyuan Tang,Rong-Jun Xie
Near-infrared phosphor-converted light-emitting diodes (NIR-pc-LEDs) are superior to traditional NIR-LEDs in spectral modulation, volume, and cost, and their optoelectronic properties are dominantly controlled by the NIR phosphors, which thus boosts the search for high efficiency and broadband NIR phosphors. In this work, we attempt to realize ultra-broadband NIR phosphors by doping Cr 3+ in self-emitting SrHfO 3 with a weak crystal field. Dual emission bands centered at 770 (host) and 1000 nm (Cr 3+ ) are observed, leading to a wide spectral range of 700–1400 nm. The Cr 3+ ions enter the HfO 6 octahedron and thus produce an NIR emission with a full width at half maximum of 190 nm and an internal quantum efficiency of 24% under 460 nm excitation. A prototype NIR-pc-LED surface light is demonstrated for machine vision by using NIR-pc-LEDs that combine the blue LED with SrHfO 3 :Cr. The work paves an avenue for designing super-broadband NIR phosphors by doping Cr 3+ or other ions into hosts with self-trapped exciton emission (e.g., halide perovskites).
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 Optical Materials
·
2014
·Vol. 2
·期 7
·670-678
·
IF 0
Enhai Song,Sha Ding,Ming Wu,Shi Ye,Fen Xiao,Shifeng Zhou,Qinyuan Zhang
An anomalous near-infrared (NIR) upconversion (UC) emission band at approximately 770 nm is demonstrated in KZnF 3 :Yb 3+ ,Mn 2+ nanocrystals with heavy Mn 2+ doping. This band would enable advanced biological imaging with improved resolution and enhanced penetration depth. Careful studies based on structure analysis, excitation and emission spectra, and luminescence decay curves indicate that this unusual NIR emission (770 nm) originates from the 6 A 1g (S) 4 T 1g (G)→ 6 A 1g (S) 6 A 1g (S) transitions of the Mn 2+ –Mn 2+ dimers. The influence of Mn 2+ concentration and temperature on the Stokes and UC luminescence properties are also investigated. The proposed mechanism for the observed NIR UC emission involves ground state absorption and excited state absorption processes. The present results not only provide a useful and effective approach to achieving pure NIR UC emission, and also new insights into the development of advanced photonic devices and technologies.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
产品关联
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Juyu Yang,Haojun Yu,Yan-gai Liu,Ruiyu Mi,Ci-an Xie,Linlin Wang,Tonglu Sun,Jingang Liu,Lefu Mei
Currently, the application potential of Cr 3+ doped near-infrared (NIR) fluoride phosphors excited by blue light is promising. However, the development of near-infrared fluoride phosphors with wider emission bandwidth remains a challenge. Herein, we employed the hydrothermal method to prepare K 2 NaCrF 6 :Fe 3+ phosphors. Upon excitation at 432 nm, the K 2 NaCrF 6 :xFe 3+ phosphors exhibited broad near-infrared emission, with the main peak ranging from 752 nm to 780 nm. As the Fe 3+ concentration increased, the luminescence intensity of the K 2 NaCrF 6 :xFe 3+ phosphor decreased, accompanied by a redshift in the emission band and an increase in the full width of the emission spectrum half-peak. These changes can be attributed to the dipole-dipole interaction, specifically the energy transfer between Fe 3+ and Cr 3+ , leading to the 4 T 2 ( 4 F) → 4 A 2 (Cr 3+ ) and 4 T 1 ( 4 G) → 6 A 1 ( 6 S) (Fe 3+ ) transitions.
研究领域:
材料科学
·
光学
·
光子学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 20
·1-10
·
IF 2.8
Ji Changjian,Zhang Hailong,Wang Wenjing,Yuan Huimin,Zhao Gang
In order to acquire a red light-emitting component for an efficient w -LEDs device, we synthesized a series of Eu 3+ -doped Sr 2 GaTaO 6 (SGT) phosphors using a traditional high-temperature solid-phase technique. The results of UV diffuse reflectance proved that the SGT host possesses a broad optical energy bandgap ( E gap ) of 4.47 eV (calculated value). The relevant characteristic spectra were also tested. By monitoring the emission at 612 nm, the excitation peak at 466 nm matches the blue light region (460–470 nm) of the popular blue LED chips on the market. The photoluminescence (PL) spectra of SGT: Eu 3+ phosphors at room temperature consisting of four obvious PL bands ( 5 D 0 → 7 F 1 , 5 D 0 → 7 F 2 , 5 D 0 → 7 F 3 , and 5 D 0 → 7 F 4 ) in the visible range. And the PL properties are necessarily analyzed by fluorescence decay curves. And it exhibits a decent photoluminescence quantum yield (39.88%). Moreover, the color purity and the ∆E of the SGT: 0.2Eu 3+ sample are 96.5% and 0.29 eV, respectively, demonstrating that the ∆E of SGT: Eu 3+ phosphor is superior to other reported Eu 3+ -doped materials for w -LEDs applications. The results manifest that the Eu 3+ doped SGT phosphors can be outstanding candidates for w -LEDs applications with high color purity and activation energy.
研究领域:
材料科学
·
光电
·
固体化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Dan-Na Song,Dao-Jun Zhang,Yong-Lei Wang,Jun-Jie Wang,Xiu-Shuang Xing,Zhi-Ying Lv,Fan Liu,Jiang-Xia Han,Ren-Chun Zhang,Shui-Jiao Liao,Run Zhang
Luminescent thermochromic materials with a dramatic shift of emission band under different temperatures are highly desirable in temperature sensing fields. However, the design of the synthesis of such compounds remains a great challenge. In this work, two new luminescent thermochromic silver iodides, (emIm)Ag3I4 (1) and (emIm)Ag2I3 (2) (emIm = 1-ethyl-3-methyl imidazole), have been synthesized under solvothermal conditions. Compound 1 features a [Ag3I4]− anionic layer, while compound 2 possesses an infinite [Ag2I3]− chain structure, both of which are charge balanced by emIm+ cations. Particularly, they display luminescent thermochromism with a significant wavelength shift of emission maximum with temperature change. They represent rare examples of infinite layered or chain silver iodides that show luminescent thermochromism. Furthermore, the results indicate that compounds 1 and 2 are promising wavelength-dependent luminescent thermometers.
研究领域:
材料科学
·
化学
·
热致变色
·
光学传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Optical Materials
·
2025
·
IF 3.8
Lei Chen,Hui Jiang,Fanghai Liu,Syed Aamir Hussain,Hossein Chamkouri,Yang Song,Ping Chen,Asad Ali,Xianghua Wang
As an alternative to toxic Cd-based blue light-emitting quantum dots (QDs) and chemically unstable perovskite ones, heavy-metal-free and stable ZnSe QDs have great potential for quantum dot light-emitting diode (QLED) displays. Through overcoming the challenge of controllable synthesis of ZnSe QDs with desirable properties, this work reported the synthesis of super-narrow-band blue-emitting ZnSe/ZnS core/shell QDs with full width at half-maximum (FWHM) of photoluminescence/electroluminescence as narrow as 19/20 nm, peaked at 446/449 nm, respectively. The crystallization of the core/shell QDs was well controlled by systematic optimization on the molar ratios of cations to anions and the amount of precursor addition. The coating shell of ZnS, which has a wider band gap than ZnSe, could effectively suppresses the fluorescence tail in the emission spectrum that is caused by defects on the ZnSe core surface, narrowing the FWHM of the emission spectrum and increasing the fluorescence quantum yield of ZnSe/ZnS core/shell QDs. The prepared QLED using ZnSe/ZnS core/shell QDs exhibits superior color purity, particularly suitable for display applications. This work opens up a new route to synthesizing heavy-metal-free ultra-narrow-band blue-emitting QDs.
研究领域:
纳米技术
·
材料科学
·
光电子学
·
显示技术
·
量子点
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Dan Chang,Zhonghua Zhao,Hu Shi,Jianyang Feng,Yongxing Yang,Lihong Shi
Ratiometric fluorescent probes with wavelength-resolved dual target sensing capacity are highly desirable for the simultaneous recognition of target objects. A novel fluorescent carbon dots (CDs) with a yield of 32% was simply synthesized by hydrothermal treatment of neutral red and urea, resulting in discrete dual-emission bands (440 nm/542 nm) under single-wavelength excitation of 380 nm. It was discovered that the fluorescence (FL) signal of CDs at 440 nm enhances with the addition of L -Lysine, whereas the FL intensity at 542 nm remains invariable. Surprisingly, no significant luminescence response is observed after the addition of D -Lysine, implying that as-prepared CDs can serve as fluorescent nanoprobes for chiral recognition of Lysine. On the contrary, it was discovered that the FL band at 542 nm is highly sensitive to pH in linear ranges of 2.0–3.4 and 3.4–8.0, while the FL band at 440 nm is inert to it, providing an effective tool for the ratiometric detection of pH in a “turn-on” mode. Confocal imaging experiments further verify that this nanoprobe can monitor L -Lysine and pH fluctuations in biological systems in real time using ratiometric methods. We believe that our research will provide new insight into the suitable construction of prompt and straightforward ratiometric fluorescent probes for the simultaneous differentiation of two analytes .
研究领域:
分析化学
·
材料科学
·
生物技术
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CRYSTAL GROWTH
·
2023
·
IF 1.8
Yi Yu,Chonghui Niu,Kai Shao,Mingjie Dan,Zhibin Wang,Yingying Wang,Jie Chen,Jiani Luo
A Ho 3+ :KBGM crystal with good quality and large size was successfully grown via TSSG method. The crystal’s structure, ambient-temperature polarized absorption and emission spectra and fluorescence lifetime were studied. The J-O theory was adopted to analyze the absorption spectra and results show that crystal exhibits relatively large intensity parameters Ω 2 and spectroscopic quality factor which is up to 3.12. At 453 nm, the absorption band is the strongest, and the corresponding cross-sections are 21.94 × 10 –20 cm 2 , 26.66 × 10 –20 cm 2 and 18.56 × 10 –20 cm 2 for the - X , - Y and - Z polarizations, respectively. The emission spectra also demonstrate the broad and strong emission band at 2030 nm. The FWHMs and cross-sections are 74 nm, 0.37 × 10 −20 cm 2 , 50 nm, 0.68 × 10 −20 cm 2 , and 49 nm 0.52 × 10 −20 cm 2 for the three polarizations, respectively. In addition, the crystal has a superior quantum efficiency which is as high as 97.1%. Taking all the analyses into account, it is reasonable to assert that the Ho 3+ :KBGM crystal an ideal candidate for ∼2 µm laser applications in many areas.
研究领域:
材料科学
·
光学
·
激光物理
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2019
·
IF 4.916
Yang Xing,Ying Zhou,Li Fan,Yajuan Yang,Yuan Zhang,Xu Deng,Chuan Dong,Shaomin Shuang
Herein, we figured out a novel ratiometric fluorescent probe based on Janus silica nanoparticles (SiO 2 NPs) where fluorescein isothiocyanate (FITC) and rhodamine B (RB) were asymmetrically functionalized for intracellular pH detection. With this unique strategy, the probe exhibited dual emission bands at 530 and 580 nm upon excitation at a single wavelength of 488 nm. The pH titrations of the probe showed a remarkable increase in ratiometric intensities ratio (I 530nm /I 580nm ) when the pH was switched from 3.0 to 8.0 with a acid dissociation constant (pKa) value of 6.64. The probe was successfully applied to imaging and detection of pH in living cells without noticeable cytotoxicity, indicating that it is a promising candidate for bioanalysis and bioimaging.
研究领域:
纳米技术
·
生物化学
·
生物医学工程
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL LETTERS
·
2017
·
IF 1.15
Lijiao Liang,Tongde Rao
Zinc is essential for normal growth and development, and hence selective recognition and detection for zinc has been a significant area of research. Here 4′-(4-methoxyphenyl)-2,2′:6′,2″-terpyridine is described for the ratiometric fluorescence quantification of zinc ion with high selectivity. The fluorescence of 4′-(4-methoxyphenyl)-2,2′:6′,2″-terpyridine at 406 nm was quenched in the presence of zinc, and a new emission band appeared at 452 nm. The ratiometric method for the determination of zinc ion was based on the dual fluorescence measurements at 406 and 452 nm. This fluorescence response is caused by the formation of a 1:1 complex between 4′-(4-methoxyphenyl)-2,2′:6′,2″-terpyridine and the zinc(II) ion. The analytical figures of merit for the protocol were obtained. The linear dynamic range extended for zinc concentrations from 3.0 to 40.0 µmol/L with a limit of detection of 0.28 µmol/L. Zinc was determined in water with satisfactory results.
研究领域:
分析化学
·
光谱学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）