JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 11
·10491-10498
·
IF 2.195
Li Zhenzhang,zhong Biliang,Cao Yujun,Zhang Shaoan,Lv Yang,Mu Zhongfei,Hu Zhengfa,Hu Yihua
Highly thermo-stable and tunable-luminescence phosphors Y 3 Al 2 Ga 3 O 12 : Tb 3+ , Sm 3+ are synthesized by conventional solid-state reaction method. In this study, the multicolor emission, thermal stability and energy transfer mechanism in Y 3 Al 2 Ga 3 O 12 : Tb 3+ , Sm 3+ are evaluated in detail. The emission color can be tuned from green to yellow by adjusting the Tb 3+ /Sm 3+ ratio. The energy transfer efficiency from Tb 3+ to Sm 3+ reaches as high level as 62.5%. Energy transfer mechanism of Tb 3+ -Sm 3+ are related to the dipole–dipole interaction. Furthermore, Y 3 Al 2 Ga 3 O 12 : Tb 3+ , Sm 3+ phosphor shows a good thermal stability, the integrated intensity (150 °C) of YAGO: 0.5 Tb 3+ , 0.1Sm 3+ still keeps more than half of that at room temperature. Therefore, the multicolor tunable phosphor Y 3 Al 2 Ga 3 O 12 : Tb 3+ , Sm 3+ presents a potential for application in the white LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiaoxuan Fan,Lirong Xu,Wen Liu,Feifei Yin,Jianbo Xu,Shuo Cao,Yadan Ding,Xia Hong,Tianya Tan,Kexin Wang,Jiwei Wang
In this work, a Bi 3+ and Eu 3+ co-doped borate oxide LiY 6 (BO 3 ) 3 O 5 (LYBO) phosphor was prepared using high temperature solid-state method. Eu 3+ can be well sensitized by Bi 3+ in the LYBO matrix under 305 nm excitation and produce well-separated emission bands with high intensity. The energy transfer from Bi 3+ to Eu 3+ results in the tunable multicolor emission from LYBO. The maximum energy transfer efficiency can reach 95.93 %. The Bi 3+ and Eu 3+ emissions exhibit the differentiated responses to thermal quenching. The fluorescence intensity ratios between 615 nm and 421 nm show a favorable linear relationship in the range of 123–483 K. It indicates the outstanding optical thermometry performance of LYBO: Bi 3+ , Eu 3+ . The maximum absolute sensitivity (S a ) and relative sensitivity (S r ) are determined to be 0.0087 K -1 and 3.84 % K −1 , respectively. The results exhibit that LYBO: Bi 3+ , Eu 3+ phosphor has a promising application as an optical thermometer in non-contact temperature measurement.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhongfa Li,Wenjun Zhang,Chengyue Xin,Zihan Chen,Jian Sheng
Mn ions in different valence states can emit light of different colors in an octahedral coordination environment, which is conducive to the development of a single matrix with multi-color luminescence and applications in the field of anti-counterfeiting. The dual mode multi-color luminescent material CaSb 2 O 6 : Mn has been successfully synthesized using a single Mn source in the atmosphere. The CaSb 2 O 6 matrix itself can also absorb 285 nm UV light, emit blue light, and show a long afterglow phenomenon. Both Mn 4+ and Mn 2+ ions will appear in the [SbO 6 ] octahedra, whether the Mn source adopts MnCO 3 or MnO 2 . The Mn 4+ ion exhibits red emission upon UV excitation at 347 nm. The Mn 2+ ion can emit a bright green light at 285 nm excitation while exhibiting a long afterglow phenomenon. In this study, the Mn 2+ doped octahedron showed unique green emission and broadens the range of its photoluminescence (PL) wavelength. The performance of the material's long afterglow properties on the digital codes demonstrates its potential for dynamic anti-counterfeiting.
研究领域:
材料科学
·
光学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 18
·3132
·
IF 5.719
Longshi Rao,Qing Zhang,Bin Sun,Mingfu Wen,Jiayang Zhang,Guisheng Zhong,Ting Fu,Xiaodong Niu
Carbon dots (CDs) are attracting much interest due to their excellent photoelectric properties and wide range of potential applications. However, it is still a challenge to regulate their bandgap emissions to achieve full-color CDs with high emissions. Herein, we propose an approach for producing full-color emissive CDs by employing a solvent engineering strategy. By only tuning the volume ratio of water and dimethylformamide (H2O/DMF), the photoluminescence (PL) emission wavelengths of the CDs can be changed from 451 to 654 nm. Different fluorescence features of multicolor CDs were systematically investigated. XRD, SEM, TEM, Abs/PL/PLE, XPS, and PL decay lifetime characterizations provided conclusive evidence supporting the extent to which the solvent controlled the dehydration and carbonization processes of the precursors, leading to a variation in their emission color from red to blue. The as-prepared CDs exhibited excellent and stable fluorescence performance even after being heated at 80 °C for 48 h and with UV light continuously irradiated for 15 h. Based on their excellent fluorescent properties and photothermal stability, bright multicolor light-emitting diodes with a high CRI of up to 91 were obtained. We anticipate that these full-color emissive CDs are beneficial for applications in lighting, display, and other fields.Keywords:carbon dots;multicolor emission;solvent engineering;light-emitting diodes
研究领域:
材料科学
·
光电领域
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 14
·6846-6855
·
IF 7.79
Xiaokai Xu,Guangqi Hu,Luoqi Mo,Yadong Li,Haopeng Wei,Bingfu Lei,Xuejie Zhang,Chaofan Hu,Jianle Zhuang,Yingliang Liu
The mechanism of the solvation-dependent multicolor luminescence of carbon dots (CDs) is not clear, despite the fact that multicolor luminescent CDs have important applications in many fields. In this article, we report solvated chromogenic CDs with productivity of up to 57%. The luminescence of the CD particles exhibits a regular redshift in N,N-dimethylformamide (DMF), ethanol, water, and acetic acid. The redshift of the CDs may be ascribed to the linking of the CD surfaces to the solvent through hydrogen bonds (HB). Different surface level states are formed by HB between the surfaces of the CDs and the solvent, and differences in dispersion states lead to different energy resonance transfer (ETR) efficiencies. The CDs/B2O3 composite exhibits excellent fluorescence thermal stability, and it has also been used to manufacture white-light-emitting devices with a high color rendering index of 87. Additionally, the excellent solvation effects of the CDs have application prospects in the detection of the water content in organic solvents. Finally, the CDs are used to realize cell imaging and positioning, which has significant application prospects in biological fields.
研究领域:
材料科学
·
生物医学
·
光学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2024
·
IF 4.1
Zelin Zhang,Fengshan Liu,Yang Xu,Huanrong Li
The growing demands for multiple-level optical information encryption require the development of novel room temperature phosphorescence (RTP) materials with long afterglow performance and multi-color phosphorescence. Carbon dots (CDs), as a new generation of carbon-based luminescent nanomaterials , have received widespread attention. Here, a series of sulfur-doped carbon dots (S-CDs) with different sulfur doping regulation are proposed as emitters to fabricate RTP materials by embedding boric acid (BA) matrix. With different sulfur doping amount, S-CDs exhibit green, yellow-green and orange RTP, respectively. The RTP spectrum can be split into three emission centers with different intensities. Thus, the multi-color RTP emission is ascribed to varied surface state of S-CDs involving the phosphorescence center intensity changes, which results from sulfur doping. The RTP lifetimes of these S-CDs are calculated to be 579.28, 540.87, and 288.89 ms, which is measured for S-CDs-G@BA, S-CDs-Y@BA and S-CDs-O@BA, respectively. In addition, the phosphorescence quantum yield (PQY) is 27.93 %, 10.62 % and 13.58 %, respectively. The encryption test is performed utilizing these multi-color RTP S-CDs, demonstrating that these S-CDs have good RTP performance and are suitable for anti-counterfeiting and information encryption.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Ya Su,Zhigang Xie,Min Zheng
Carbon dots (CDs) with concentration-modulated luminescence were obtained by pyrolysis of citric acid (CA) and thiourea (TU). CDs exhibit multi-colored emission by varying their concentrations. As a contrast, Zr-doped CDs (ZrCDs) were prepared from CA, TU and ZrCl 4 in a similar way. To our surprise, no concentration-dependent emission were observed in ZrCDs. Structural and optical characterizations prove that the concentration-tunable fluorescence is attributed to the aggregation between CDs. As the concentration increases, the aggregation of CDs results in a gradual decrease in the band gaps (from 2.18 eV to 1.56 eV), which ultimately causes the fluorescence to redshift continuously. However, ZrCDs are always in a highly dispersed state no matter how the concentration goes up, the zirconium complexes on the surface of ZrCDs prevents them from aggregation and maintains the band gap of ZrCDs at about 2.21 eV. Therefore, we proposed an aggregation-induced multicolor emission mechanism for CDs, which has a certain reference significance for exploiting the potential applications of CDs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Changchang Li,Xinyang Zhao,Chao Li,Junhua Hu,Jinyang Zhu,Qing Lou,Niu Chen,Zhijiang Song,Xu Chen,Gencai Pan
Room temperature phosphorescence (RTP) materials are highly attractive in many fields, but it is still a great challenge to obtain RTP materials with color tunability. Herein, we report a new type of multicolor phosphorescence carbon dots (CDs) through confining CDs into rigid crystal network through the introduction of ionic bonds . The RTP color can rationally vary from green (553 nm) to orange-red (640 nm) under different excitation wavelengths. More importantly, the obtained CDs can also maintain their RTP emission in ethanol solution. The excitation-dependent property was owing to the existence of polychromatic emission centers on the surface of CDs, and the generation of RTP can be attributed to the ionic bond in CDs system to suppress non-radiative transition of triplet states. Based on this unique multicolor RTP phenomenon, the CDs were successfully applied in anticounterfeiting and light-emitting diodes. This finding not only provides a new strategy for the preparation of multicolor RTP materials but also reveals a great potential of CDs in developing novel optical materials.
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 NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 12
·7694-7697
·
IF 1.134
Liu Nian,Chen Xiao,Ma Xiaopeng
Sub-30 nm lanthanide-doped KLu2F7 upconversion (UC) nanorods were synthesized using a hightemperature coprecipitation method. Highly uniform morphologies, a small size distribution and the desirable orthorhombic crystalline phase was achieved by controlling the
reaction temperature; while control over the UC luminescence color was achieved by changing the dopant activator. Orthorhombic KLu2F7 nanorods showed excellent potential as a host phase for future UC luminescence materials in applications such as bioimaging.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2013
·Vol. 42
·期 34
·12101-12108
·
IF 3.806
Zhuo Wang,Jing Feng,Min Pang,Shunhao Pan,Hongjie Zhang
In this paper, uniform rice-shaped lanthanide doped BiPO4 upconversion submicron particles have been successfully synthesized via a facile room-temperature co-precipitation reaction and subsequent calcination route. The morphology, phase transformation and upconversion luminescent properties of synthesized submicron particles (SMPs) were characterized by using different analytical techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetry-differential scanning calorimetry (TG-DSC) and upconversion luminescence (UCL) spectra. The transformation from hexagonal phase to monoclinic phase is crucial for upconversion luminescent properties due to the loss of water molecules in the lattice of hexagonal phase. With different variety and concentration of the dopant Ln3+ (Ln = Yb, Er, Tm and Ho) ions, the obtained samples present bright green, blue, and red upconversion emissions under a 980 nm continual wave laser diode excitation. Multicolor and bright white upconversion emissions have also been obtained by precisely adjusting the dopants concentration in the host lattice.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Chao Wang,Zhengguang Yan,Lin Ma,Jiawen Xiao
Advanced optical information encryption usually relies on the integration of multicolor, stimulus-responsive, and afterglow luminescence. However, achieving these simultaneously within a single-phase system has posed challenges, complicating the design process. In this study, an advanced 3D information encryption strategy is presented based on undoped and alloyed Cs₂CdCl₄, encrypted through three distinct channels: emission wavelength, water stimulation, and afterglow time. Specifically, Mn 2+ , Sb 3+ , and Ag + doped Cs₂CdCl₄ single crystals are successfully synthesized via a modified hydrothermal method, which exhibit bright orange, green, and blue emissions, respectively. Decryption of specific information can be achieved by employing corresponding narrowband filters. Furthermore, the Cs₂CdCl₄ system demonstrates hydrochromism, attributed to water-induced sequential phase transitions. Upon water treatment, the 2D Cs₂CdCl₄ will undergo a phase transition to Cs 3 Cd 2 Cl 7 , and finally to cubic CsCdCl 3 . Interestingly, the resultant CsCdCl 3 exhibits pronounced afterglow, originating from the triplet emission of Cd ions. Leveraging these unique properties, a highly secure and adjustable 3D encrypted quick response code is designed. The encrypted information is encoded in coordinates, and decrypted information can be retrieved in both compressed and decompressed modes as required. These findings pave the way for the development of novel smart photonic materials and multimodal optical information encryption.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 51
·期 2
·553-561
·
IF 4.39
Dangli Gao,Kaiwei Ma,Peng Wang,Xiangyu Zhang,Qing Pang,Hong Xin,Zihan Zhang,Huan Jiao
Traditional fluorescent materials used in the anti-counterfeiting field usually exhibit monochromatic luminescence at a single-wavelength excitation, which is easily forged by sophisticated counterfeiters. In this work, Zn2GeO4:Mn,x%Li (x = 0 and 20), Zn2GeO4–NaLiGe4O9:Mn,x%Li (x = 50 and 70) and NaLiGe4O9:Mn micro-phosphors with multi-chromatic and multi-mode luminescence have been successfully synthesized via a hydrothermal approach followed by an annealing treatment. As expected these Li+ doped Zn2GeO4:Mn and Zn2GeO4–NaLiGe4O9:Mn phosphors exhibit a double peak emission including a long green afterglow (∼540 nm) and red photoluminescence (∼668 nm). By tuning Li+ doping concentrations, a gradual colour output and a tuneable afterglow duration are achieved. In particular, the Zn2GeO4:Mn,Li and NaLiGe4O9:Mn phosphors exhibit excellent performance as security inks for printing luminescent numbers and anti-counterfeiting patterns, which show an afterglow time-dependent or excitation wavelength-dependent luminescence colour evolution. This work proves the feasibility of the Li+ doping strategy in emission tuning, which can stimulate further studies on multi-mode luminescent materials for anti-counterfeiting applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）