SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Cong Xiang,Jingyi Fang,Yanlin Huang,Zhuo Zheng,Hyo Jin Seo
Eu 3+ is not only a major red-emitting activator, but also an excellent spectral probe ion. This work reports the Eu 3+ -sites and luminescence in the cation-deficient perovskite tungstates, A-site deficient SrLa 2 (Mg 2 W 2 )O 12 [Sr 1/2 □ 1/2 La(MgW)O 6 ] and B-site deficient Sr 2 La 2 (MgW 2 )O 12 [SrLa(Mg 1/2 □ 1/2 W)O 6 ]. The 7 F 0 → 5 D 0 excitation spectra of Eu 3+ activators in two lattices were measured via pulsed dye laser. In SrLa 2 (Mg 2 W 2 )O 12 :Eu 3+ , there is only one 7 F 0 → 5 D 0 transition, which could be related to the Eu 3+ center on La 3+ sites; while, two 7 F 0 → 5 D 0 transitions in Sr 2 La 2 (MgW 2 )O 12 indicate Eu 3+ ions occupy Sr 2+ in addition to La 3+ , resulting in the luminescent centers related to heterovalent substitution defects. The different Eu 3+ sites make two phosphors exhibit different red luminescence properties. SrLa 2 (Mg 2 W 2 )O 12 :Eu 3+ shows higher luminescent efficiency and thermal quenching due to its regular distribution of the activators resulting in lower dispersion losses of the energy transfer. The experimental results show that rare earth ions occupy different crystallographic positions in A -site and B -site deficient perovskite oxides, and this microstructure can be important for the corresponding luminescent properties.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 11
·2331
·
IF 4.6
Ajeesh Kumar Somakumar,Ivo Romet,Agnieszka Grabias,Marcin Kruk,Shusaku Hayama,Damian Wlodarczyk,Justyna Barzowska,Yadhu Krishnan Edathumkandy,Eduard Feldbach,Puxian Xiong,Yaroslav Zhydachevskyy,Monika Trzaskowska,Hanka Przybylinska,Andrzej Suchocki
An extensive experimental study of trivalent iron (Fe3+) ions in orthorhombic lithium gallate nanocrystals was undertaken. Various spectroscopic methods, such as Raman spectroscopy, extended X-ray absorption fine structure, the Mössbauer effect, electron paramagnetic resonance, photoluminescence, thermoluminescence, and cathodoluminescence were used to investigate the synthesized phosphor. This study revealed the existence of multiple Fe3+sites, out of which the tetrahedral sites are preferentially occupied. Extensive optical studies showed that the Fe3+doped lithium gallate phosphor is a promising candidate for various luminescence and thermoluminescence-related applications in the near-infrared regime.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Research Express
·
2014
·Vol. 1
·期 1
·015033
·
IF 0
Yanyan Chen,Shenjie Li,Lijian Huang,Daocheng Pan
Au+ ions have been successfully incorporated into the lattice of ZnxCd1−xS quantum dots as luminescent centers via an aqueous method. The dopant emission can be tuned in the range of 445 to 570 nm, and the highest quantum yield can reach as high as 30%. Our results showed that Au+ ions can be used as an excellent luminescent dopant in doped quantum dots. Finally, these water-soluble quantum dots can be used directly in PL imaging of HepG2 cells without conjugating any biological targets, indicating a high potential application in bio-labeling.
研究领域:
材料科学
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生物学
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医学
✓ 已验证
产品关联
DOI
RSC Advances
·
2016
·Vol. 6
·期 109
·107263-107269
·
IF 3.289
Bo Li,Yali Guo,Anam Iqbal,Yaping Dong,Wu Li,Weisheng Liu,Wenwu Qin,Yabin Wang
Excitation-dependent luminescence (EDE) or excitation-independent luminescence (EIE) property of carbon dots (CDs) has attracted considerable attention. For the first time, we found that nitrogen doped CDs possess adjustable EDE and EIE properties by changing the corresponding environmental pH values for photoluminescence (PL) properties. Structural characterizations and property tests demonstrate that the unique photoluminescence properties of CDs can be attributed to the synergistic effect from the PL centers in the carbon core and on the surface. Doping nitrogen into the carbon core improves the emission efficiency of PL centers; these enhanced PL sites can even dominate fluorescence emission. Passivated surfaces of CDs modified with amino groups not only further boost the emission efficiency, but also make energy levels of PL centers more uniform. In addition, the mechanism of synergistic effect is investigated, which opens up the possibility of designing CDs with desirable PL characteristics. Such nitrogen-doped CDs with adjustable excitation-related luminescence properties have potential applications in detecting acidity or alkalinity of a certain physiological environment by intuitively observing the change in the wavelength.
研究领域:
材料科学
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光学
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生物医学
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
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2016
·
IF 9.407
Jun-Cheng Zhang,Yun-Ze Long,Xu Yan,Xusheng Wang,Feng Wang
Recoverable mechanoluminescence (ML), characterized by nondestructive and repetitive luminescence in response to a mechanical stress, has shown considerable promise in a variety of practical applications including lighting and display, as well as stress sensing and imaging. However, the progress in utilizing ML processes has been constrained by the difficulties in developing new ML materials and in ascertaining ML mechanism. In this paper, we report a new strategy to constructing recoverable ML materials by doping piezoelectric hosts with luminescent lanthanide ions, which simultaneously create luminescent centers and carrier traps in the host lattice. The viability of the strategy has been confirmed by assessing a series of Pr3+ activated calcium niobates composed of mCaO·Nb2O5 (m = 1, 2, and 3). Furthermore, systematical characterizations of the series of calcium niobates also reveal an unusual host dependent ML phenomenon. Our results are expected to expand the scope of designing ML materials and to deepen our understanding of ML mechanism, thereby promoting further utilization of recoverable ML.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
INFRARED PHYSICS & TECHNOLOGY
·
2023
·
IF 3.3
Junyi Wang,Feifei Huang,JiaBo Li,Bingpeng Li,Ying Tian,Shiqing Xu
ZnGa/AlO 4 provides an octahedral coordination field in which Ni 2+ serves as the luminescent center and combines with highly attractive transparent glass ceramics, playing a crucial role in achieving broadband near-infrared (NIR) emission. Transparent glass-ceramics embedded with ZnGa/AlO 4 :Ni 2+ mixed crystals prepared by secondary high-temperature melting methods retain the structural characteristics of the dual-phase crystal, which was confirmed by a series of structural and morphological characterization. Through fine tailoring, the surrounding Ni 2+ ligand field environment was transformed, realizing special composite NIR emission characteristics with a half-maximum width (FWHM) exceeding 280 nm, which achieved the best results for now in kinds of similar materials. The results show that the NIR emission of ZnGa/AlO 4 :Ni 2+ -doped transparent glass-ceramics is significantly broadened while maintaining a high level and a long lifetime, which makes it an excellent candidate material for IR light sources and broadband fiber amplifiers.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Shichang Xu,Yanjie Zhang,Xiuping Wu,Jinlong Wang,Bing Li,Jingjie Yu
The red@green core-shell emitting phosphor with monodisperse luminescence center was successfully constructed by Eu 2+ doped Sr 2 Si 5 N 8 and Sr 2 Si 5 N 8 @SrSi 2 O 2 N 2 via a deposition-precipitation (DP) method. Compared to traditional solid state reaction (SSR) method, under excitation at 370 nm, Sr 2 Si 5 N 8 :0.05Eu 2+ phosphor prepared by DP method exhibits red emission at 611 nm and an ~1.4-fold luminescent intensity enhancement. Interestingly, upon near-ultraviolet (NUV) excitation, Eu 2+ doped Sr 2 Si 5 N 8 @SrSi 2 O 2 N 2 phosphors prepared by DP method exhibit a dual emission feature with the green emission at 538 nm and red emission peak at 611 nm. The elemental line scanning spectrum of the energy dispersive X-ray analysis indicates a core@shell structure of Sr 2 Si 5 N 8 @SrSi 2 O 2 N 2 . Furthermore, this red@green core-shell emitting phosphor can be encapsulated in ultra-low melting Sn-F-P-O glass to achieve the white light with excellent color quality Ra = 85) and low correlated color temperature (4484 K) when pumped by near ultraviolet LED chips.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xue Yang,Xiangyu Zhang,Yuanyuan Hu,Jia Yu,Yuqiang Wang,Sining Yun,Dangli Gao
Afterglow energy storage materials, also known as photovoltaic cells, can continuously emit luminescence for a few minutes to hours, demonstrating enormous potential applications in many fields. However, due to the mysterious nature of their energy storage traps, the development of afterglow materials has largely remained in a state of trial and error. Here, encouraged by the rich intrinsic defects such as the anti-site defects of Li + and Ga 3+ and oxygen-related defects in LiGa 5 O 8 (LGO)-based phosphors, LGO:Bi 3+ ,Ln 3+ (Ln Tb and Eu) and LGO:Cr 3+ ,Ln 3+ (Ln Ce, Pr, Tb, Nd and Dy) phosphors were developed to explore the criteria of doping ions as effective afterglow centers. A phenomenological theory on effective afterglow centers has been proposed based on the energy-resonance degree between the energy levels of luminescence center and defect states through the analysis of multi-color and multi-mode spectra, dynamic afterglow spectra, thermoluminescence curves, X-ray photoelectron spectroscopy, and band theory calculations. This study provides a theoretical basis for the rational design of efficient afterglow materials and offers new insights into unveiling the afterglow mechanism.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Ruijia Sun,Nianqiao Liu,Wei Zheng,Jiangwei Zhang,Ning Li,Huqiang Lian,Hong Liu,Yuhai Zhang
The photoluminescence of green-emitting Cs4PbBr6 crystals has shown superior stability over that of the standard CsPbBr3 phase toward many harsh conditions, including long-term storage, heat shock, light irradiation, and even multiple solvent rinsing. However, the understanding of its origin remained controversial, partially due to the lack of real-time observation on its initial formation stage. Here, this work reported the direct observation of emitter generation in the crystallization stage. Through the use of a home-made crystal incubator coupled with a fluorescent microscope, both the crystal growth and emitter emergence were tracked in a real-time manner. The emitter distribution was found oriented along the c axis and the cooling rate of the precursor was found as a key factor to manipulate the emitter density, which was reported for the first time to the best of our knowledge. Through an ultraslow cooling procedure, a full-body emitting crystal of high photoluminescence quantum yield (PL QY) up to 83% was obtained. The emitter emergence was accompanied with a release of strain as evidenced by Williamson–Hall fitting, and the PL evolution was further simulated with the Johnson–Mehl–Avrami model. Combined with the linear relationship of lifetime to temperature, a two-dimensional phase of disordered Csn+1PbnBr3n+1 was proposed as the emitter according to the Rosales model. Although the direct evidence of the emitter phase remains elusive, this work provided many new insights into the PL origin of Cs4PbBr6.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACTA MATERIALIA
·
2024
·
IF 8.3
Tianshuai Lyu,Pieter Dorenbos,Zhanhua Wei
Discovering bismuth based smart materials that can respond to thermal, mechanical, and wide range X-ray to infrared photon excitation remains a challenge. Such materials have various uses like in advanced information encryption . In this work, valence state change between Bi 2+ , Bi 3+ , and Bi 4+ , and the dual role of Bi 3+ in trapping electrons and holes have been studied in Bi 3+ or/and Ln 3+ (Ln=Tb or Pr) doped LiScGeO 4 family of compounds by vacuum referred binding energy (VRBE) diagram construction, thermoluminescence , and spectroscopy. Electron release from Bi 2+ has been evidenced. It can be used to experimentally determine the VRBE in the Bi 2+ 2 P 1/2 ground state and to realize Bi 3+ negative quenching luminescence . Particularly, a new force induced charge carrier storage phenomenon has been discovered for non-real-time force recording. Wide range of emission tailorable afterglow , unique Bi 3+ ultraviolet-A, white, and infrared afterglow have been demonstrated by using Bi 3+ as a hole trapping and recombination center and using energy transfer processes from Bi 3+ to Tb 3+ , Pr 3+ , Dy 3+ , or Cr 3+ . Proof-of-concept advanced anti-counterfeiting, information encryption, and X-ray imaging will be demonstrated. This work not only develops smart storage phosphors , but more importantly unravels the valence change between Bi 2+ , Bi 3+ , or Bi 4+ and how it can affect the trapping and release of charge carriers with thermal, optical, or mechanical excitation. This work therefore can promote the discovery and development of Bi 3+ based smart materials for various applications.
研究领域:
材料科学
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光学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Shuaichen Si,Xiaoxuan Guo,Weijiang Gan,Xuejie Zhang,Bang Lan,Man-Rong Li,Jing Wang
Lead-free perovskite variants have attracted wide interest because of the lead-free feature and broadband emission originated from self-trapped exciton (STE), which show great advantages in lighting applications. Especially the tetravalent Te-doped A 2 B(IV)X 6 perovskite variants, which have efficient excitation in the blue range and strong emission in the yellow region as well as high photoluminescence quantum yield , is particularly suitable for solid-state lighting. Despite these fascinating properties, it is still not suitable for high-power illumination due to its poor thermal resistance and severe light saturation feature at high laser power density. Herein, we develop a lead-free perovskite variant Rb 2 SnCl 6 :Te based phosphor-sapphire composite (PSC) fused with low-melting glass through a simple screen-printing and sintering process . The as-prepared PSC shows yellow-green emission at 570 nm, due to the combination of Te luminescent center and Jahn-Teller-like STE, and exhibits a high thermal conductivity of 37.06 W m −1 K −1 . Benefitted from the high thermal conductivity of the sapphire substrate , the PSC exhibits the great improvement in light saturation behavior, heat dissipation, and chromaticity stability withstand the high-power blue laser , compared to Rb 2 SnCl 6 :Te phosphor, finally contributing to an excellent PLQY of 70.3%. In addition, by combining the PSC with the blue laser, a warm white light with a CIE chromaticity coordinate of (0.368, 0.344), and a correlated color temperature of 4129 K is achieved. These results demonstrate that this simple and low-cost fabrication method is expected to be widely used for various phosphors and the PSC can own excellent application prospects in high-power laser-driven lighting.
研究领域:
材料科学
·
光学工程
·
固态照明
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Bin Li,Yingfang Li,Bin Cao,Chong Yang,Rongbo Ma,Chaoyong Deng,Weichao Huang
The high-temperature solid-state method synthesized novel double perovskite CaSrLaSbO 6 : Bi 3+ , Mn 4+ phosphors. Its crystal structure, luminescence properties, crystal field strength, energy transfer process, and temperature-sensitive properties were comprehensively investigated. The band gap values of CaSrLaSbO 6 were calculated using density functional theory. In the CaSrLaSbO 6 host, Bi 3+ exhibits multiple emission properties in the violet, blue, and NIR regions due to the 3 P 1 → 1 S 0 transition, while the red emission is due to the 2 E g → 4 A 2g transition of Mn 4+ . Light-converting films fabricated using CaSrLaSbO 6 :Bi 3+ , Mn 4+ under 302 nm UV excitation with multiple emissions showed significant plant growth promotion. In addition, the optical temperature-dependent response of CaSrLaSbO 6 : Bi 3+ , Mn 4+ was analyzed using the luminescence intensity ratio technique, and the relative sensitivity of the best samples reached 2.1 % K −1 . The above results indicate that CaSrLaSbO 6 : Bi 3+ , Mn 4+ provides almost all the light sources necessary for plant growth and can be applied in the field of optical temperature sensors, which shows that this multifunctional phosphor has great potential for application.
研究领域:
材料科学
·
植物学
·
光学工程
✓ 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）