Advanced Optical Materials
·
2016
·Vol. 4
·期 5
·798-806
·
IF 5.359
Enhai Song,Zitao Chen,Ming Wu,Sha Ding,Shi Ye,Shifeng Zhou,Qinyuan Zhang
In contrast to well-known multiple and fixed upconversion (UC) emission bands from lanthanide (Ln 3+ ) ions activated luminescent materials, room temperature wavelength-tunable single-band UC emissions are designed and demonstrated in Ln 3+ ions/transition metal Yb 3+ /Mn 2+ codoped fluoride perovskites ABF 3 (A = K + , Rb + , and Cs + ; B = Mg 2+ , Zn 2+ , and Cd 2+ ). Upon 976 nm laser excitation, the perovskites ABF 3 :Yb 3+ , Mn 2+ exhibit intense single band UC emission centered at 550–610 nm depending on the substitution of the A + and / or the B 2+ species in ABF 3 . Crystal structure and luminescent properties analysis show that the UC emission should originate from the transitions of super-exchange coupled Yb 3+ –Mn 2+ pair. The Stokes and UC emission properties, UC luminescence decay behaviors, as well as temperature dependent UC emission properties of ABF 3 :Yb 3+ , Mn 2+ are investigated and discussed in detail. The intense room (or high) temperature UC emission and ultralong UC decay lifetimes (≈25–45 ms) clearly reveal that the perovskites ABF 3 :Yb 3+ , Mn 2+ can be potentially applied in the fields of time-resolved luminescence imaging, lighting, and solid state lasers.
研究领域:
材料科学
·
光学材料
·
无机化学
·
光子学
·
固体物理
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 9
·期 6
·2047-2053
·
IF 7.059
Guojun Zhou,Zhiyang Liu,Maxim S. Molokeev,Zewen Xiao,Zhiguo Xia,Xian-Ming Zhang
Low-dimensional-networked metal halides are attractive for the screening of emitters applied in solid-state lighting and displays, but the lead toxicity and poor stability are obstacles that must be overcome in industrial applications. Herein, we aim at the discovery of bright and stable photoluminescence in zero-dimensional (0D) Mn2+-based metal halides. By manipulation of Cl/Br transmutation, the nature of the halogen can be confirmed as a pivotal factor to tune the PL behaviors, and the optimum Mn2+ emission with a high PLQY of 99.8% and a short lifetime of 0.372 ms can be achieved in (C24H20P)2MnBr4. The thermal quenching behaviors have been discussed in depth, indicating that the synergistic effect of good chemical stability of organic groups, a long Mn⋯Mn distance of 10.447 Å and a relatively large activation energy (ΔE = 0.277 eV) provides a platform for achieving excellent thermal stability in (C24H20P)2MnBr4. Moreover, the as-fabricated white LED device with a high luminous efficacy of 118.9 lm W−1 and a wide color gamut of 105.3% National Television System Committee (NTSC) shows that (C24H20P)2MnBr4 can be employed as a desirable narrow-band green emitter for LED displays. This work provides a new understanding of fine tailoring halogens, and proposes a feasible approach to achieving high thermal stability emitters toward the targeted practical applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Pengcheng Zhang,Yuanyuan Zhang,Kuo Gao,Diao Zhang,Yu Zhao,Jin Lin,Na Li,Zixuan Shi,Mingxi Zhang,Fengfeng Li
With the growing severity of counterfeiting threats, counterfeiting anti-counterfeiting technologies including fluorescence, QR codes, and query-based labels, rely on static patterns with limited encryption security, leading to inadequate protection and a lack of diversity in anti-counterfeiting strength. Consequently, advancing dynamic anti-counterfeiting systems has become an urgent priority. This study developed a novel dynamic anti-counterfeiting strategy through the synthesis of yellow persistent luminescent CaGa 2 O 4 :Mn 2+ via high-temperature solid-state reaction. In this research, the results demonstrated that at the doping concentration of 0.001 mol Mn, the sample exhibited the best luminescence properties. Furthermore, electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) analyses revealed that electron traps responsible for the afterglow process primarily originated from oxygen vacancies, and the underlying afterglow mechanism was elucidated. Finally, CaGa 2 O 4 :Mn 2+ long-lasting phosphorescent ink was synthesized and anti-counterfeiting labels were fabricated via screen printing technology. The material's intrinsic photoresponsive behavior enables time-dependent luminance decay post-UV excitation, establishing dynamic authentication through programmable optical evolution, Which effectively realize dynamic anti-counterfeiting.
研究领域:
材料科学
·
光学材料
·
安全技术
·
固态化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Pei Gao,Boxiong Shen,Peng Zhao,Guofei Shi,Xiaolan Zhao
Recycling metal resources from spent battery powder to prepare electrode materials is an eco-friendly and sustainable strategy. However, direct utilization of spent battery powder is mostly ignored, and the prepared electrode materials by this approach exhibit limited electrochemical performance. Herein, we employ unpurified spent zinc-carbon battery powder (SP) and carbon nanotubes (CNTs) as raw materials to fabricate SP/CNTs via the ball milling method, and then use a novel electrochemical activation strategy to obtain oxygen vacancy-rich SP@CNTs (Ov-SP@CNTs) materials. Under the combined action of CNTs doping and oxygen vacancies caused by the tuning of Mn 2+ /Mn 3+ ratio via the electrochemical activation strategy, the optimum electrode (Ov-SP@CNTs-10) for supercapacitor shows the specific capacitance of 443.9 F g −1 at 1 A g −1 , which is nearly six and three times higher than that of SP and SP/CNTs electrodes, respectively. Additionally, the packaged asymmetric supercapacitor (ASC) device with Ov-SP@CNTs-10 as the cathode and commercial active carbon (AC) as the anode manifests a large energy density of 25.51 Wh·kg −1 at the power density of 399.98 W kg −1 , and the capacity retention of 88.58% after 10,000 cycles at 4 A g −1 . This work opens up a new way for the direct utilization of SP to prepare high-performance supercapacitor electrode materials.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Yuzhen Wang,Qian Zhu,Jiance Jin,Wei Liao,Zhiguo Xia
All-optical logic gates (AOLGs) have attracted considerable attention for their high computing speed, low power consumption, and parallel processing; however, chemical design of new luminescent materials is a challenge to explore a facile platform for undertaking AOLGs. Here, an AOLG system is developed based on the organic–inorganic hybrid halides [NH 3 (CH 2 ) 2 NH 3 ] 2 ZnCl 6 :Mn 2+ with tricolor luminescence under dual-wavelength excitation, and the intrinsic emission mechanisms are further addressed. When employing 275 and 365 nm UV excitations as input signals, the AOLGs conduct Boolean operations “OR, YES, AND” via identifying the green (G) and red (R) emissions and their intensity ratio (R/G) as output signals. This work further demonstrates the AOLG operation imaging and image processing via hybrid halide emitters, indicating promise in optical computing applications.
研究领域:
材料科学
·
光电
·
光子学
·
计算光学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-9
·
IF 17.694
Song Enhai,Chen Meihua,Chen Zitao,Zhou Yayun,Zhou Weijie,Sun Hong-Tao,Yang Xianfeng,Gan Jiulin,Ye Shi,Zhang Qinyuan
Photothermal sensing is crucial for the creation of smart wearable devices. However, the discovery of luminescent materials with suitable dual-wavelength emissions is a great challenge for the construction of stable wearable optical fibre temperature sensors. Benefiting from the Mn 2+ -Mn 2+ superexchange interactions, a dual-wavelength (530/650 nm)-emitting material Li 2 ZnSiO 4 :Mn 2+ is presented via simple increasing the Mn 2+ concentration, wherein the two emission bands have different temperature-dependent emission behaviours, but exhibit quite similar excitation spectra. Density functional theory calculations, coupled with extended X-ray absorption fine structure and electron-diffraction analyses reveal the origins of the two emission bands in this material. A wearable optical temperature sensor is fabricated by incorporating Li 2 ZnSiO 4 :Mn 2+ in stretchable elastomer-based optical fibres, which can provide thermal-sensitive emissions at dual- wavelengths for stable ratiometric temperature sensing with good precision and repeatability. More importantly, a wearable mask integrated with this stretchable fibre sensor is demonstrated for the detection of physiological thermal changes, showing great potential for use as a wearable health monitor. This study also provides a framework for creating transition-metal-activated luminescence materials.
研究领域:
材料科学
·
光学工程
·
生物医学工程
·
可穿戴技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 12
·期 4
·1309-1316
·
IF 6.4
Zhichao Liu,Yuexiao Pan,Xiaoxiao Fu,Yihong Ding,Liyi Li
The development of efficient, non-toxic, and cost-effective white-light emitters is crucial for advancing lighting technology. Here, we present a groundbreaking study on a new all-inorganic perovskite crystal, CsCaCl3:Mn2+, which exhibits temperature sensing and hue-tunable white light emission. The CsCaCl3 matrix emits broad blue light at 455 nm due to self-trapped exciton (STE) emission. Upon Mn2+ doping, the CsCaCl3:Mn2+ crystal emits broad yellow light at 555 nm, originating from the Mn2+ 4T1(G)–6A1(S) transition. Increasing Mn2+ concentration led to a decrease in blue emission intensity, accompanied by enhanced yellow emission, suggesting an energy transfer from STEs to Mn2+. The enhanced stability of CsCaCl3:Mn2+ compared to pure CsCaCl3 is demonstrated through thermal analysis. The distinctive temperature-dependent responses of STE and Mn2+ emissions in CsCaCl3:Mn2+ suggest its potential application in temperature sensing. The synthesis process for this luminescent crystal is both straightforward and scalable, making it a promising candidate for large-scale applications.
研究领域:
材料科学
·
光学工程
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Qiliang Chen,Han Xu,Shuai Yang,Guoying Zhao,Langping Dong,Jingshan Hou,Yongzheng Fang
A series of color-tunable Na 2 Ca(PO 4 )F:Eu 2+ , Mn 2+ phosphors were prepared by solid state reaction. The structure, as well as the photoluminescent properties of the as-prepared phosphor were investigated. The energy transfer process between Eu 2+ -Mn 2+ was also discussed. The phosphor demonstrates luminescence in the range of 420 nm–750 nm under UV excitation. Specifically, the emission spectra comprise green light (420–550 nm) attributed to the 4f-5d transition of Eu 2+ ions, and orange red light (550–750 nm) resulting from the 6 A 1 → 4 A 1 ( 4 G), 4 E( 4 G) transitions of Mn 2+ ions. An effective dipole-dipole energy transfer has been confirmed to occur between the co-doped Eu 2+ and Mn 2+ ions. The luminescent color of the as-prepared phosphors can change from blue to yellow, and finally to orange red by adjusting the doping amount of the co-doped ions. The optimal sample's EQE reached 20.59% due to the high absorption efficiency. Finally, a 400 nm violet light chip excited white LED with a high color rendering index (CRI) of Ra = 98 was fabricated by using the as-prepared Na 2 Ca(PO 4 )F:0.02Eu 2+ ,0.04Mn 2+ phosphor in combination with the commercial blue Sr 5 (PO 4 ) 3 Cl:Eu 2+ phosphor and red CaAlSiN 3 :Eu 2+ phosphor. The results indicated that the developed phosphor holds notable potential for application in in the field of sunlike healthy lighting.
研究领域:
材料科学
·
光电子学
·
固态照明
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Liming Yang,Yanjun Cui,Bing Hu,Qian Yang,Xia Xu
Perovskite quantum dots (PQDs) offer high photoluminescence quantum yields. However, their poor stability and aqueous-quenching of fluorescence limit their wider application, especially in biochemical detection. In this work, a simple and highly successful coating strategy was used to encapsulate Mn2+-doped CsPbCl3 PQDs in poly(ethylene glycol) (PEG), effectively increasing the water stability of PQDs. After dispersion in deionized water for 25 days, the CsPbCl3/Mn2+/PEG nanocrystals (NCs) retained 40% of their initial fluorescence intensity. In addition, due to the FRET mechanism, 4-nitrophenol (4-NP) can effectively quench the fluorescence of CsPbCl3/Mn2+/PEG NCs. Therefore, utilizing the excellent water stability of CsPbCl3/Mn2+/PEG NCs and their interaction with 4-NP, a fast and conservative fluorescent probe can be established, which can perform highly selective and ultrasensitive quantitative detection of 4-NP in aqueous solutions. In addition, the molecular weight of PEG used for encapsulation, the fluorescence intensity of CsPbCl3/Mn2+/PEG NCs, and the detection range for 4-NP vary. Fortunately, the detection limits are all lower than the drinking water concentrations allowed by the U.S. Environmental Protection Agency. This study also provides a theoretical basis and methodological support for the subsequent application of PQDs in the detection of water pollutants.
研究领域:
材料科学
·
纳米技术
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 2
·1216-1229
·
IF 4.186
Guangtao Lu,Yichao Wang,Siqi Piao,Jinsu Zhang,Xizhen Zhang,Xufeng Zhou,Yongze Cao,Xiangping Li,Baojiu Chen
The excellent narrow-band emitters, especially the green ones, are regarded as a pivotal research direction for light-emitting diodes (LED) backlights in liquid-crystal displays (LCDs). A nearly single-peak green emission centered at 513 nm with a full width at half maximum of 28 nm is reached in KAl 11 O 17 :0.1Eu 2+ , 0.15Mn 2+ phosphor via nearly 100% energy transfer (ET) efficiency, and the extended X-ray absorption fine structure analysis elucidates its mechanism, which is that Eu 2+ and Mn 2+ are constrained to form Eu 2+ –Mn 2+ pairs with a small distance 3.7 Å caused by the local environment relaxation inducement. Meanwhile, by creating an unhindered energy flow between Eu 2+ , Mn 2+ and K + /O 2− defect levels through ET and multilevel electron trapped and recombination process, the KAO:Eu 2+ , Mn 2+ phosphors perform superb photoluminescence property with a high color purity of 83%, an excellent thermal stability (94%@200°C), and unexceptionable internal and external quantum efficiencies of 91.7% and 66.4%, which all are superior to characteristics of commercial β-SiAlON:Eu 2+ phosphor. Moreover, the white LED fabricated using KAO:Eu 2+ , Mn 2+ to provide green component shows a wide color gamut of 105% National Television System Committee. These results indicate a potential for an application of our material in LCD–LED backlights, and the design of such local relaxation-induced structure provides a significative reference to develop the new narrow-band emitters.
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
Materials Today Advances
·
2024
·
IF 8.1
Reziwanguli Yantake,Aierken Sidike,Wang Qingling,Zhou Shihang
Among the green-cyan phosphors widely used in white LEDs, the full width at half maximum, thermal stability and quantum efficiency are key performance indicators. This kind of phosphor should have stable peak shape and peak position when working at different temperatures. It should simultaneously exhibit ultrawideband emission, which is conducive to the realization of two-color white light and simplification of the preparation process of white LED devices. In this paper, a series of KAlSiO 4 :Eu 2+ , Mn 2+ luminescent materials were synthesized by a high-temperature recalcination strategy. Phase analysis and refinement results showed that the samples were effectively synthesized. After the first calcination, a bright green powder was obtained. The main emission peak was at 514 nm, and the FWHM was 30 nm. After recalcination, the color of the light emission from the representative samples changed from green to cyan-green, which was very close to white light, under near-UV irradiation. The emission range was wide, including blue and green light, and the full width at half maximum could reach 150 nm. After recalcination, the emission intensity of the representative samples increased by 3.4 times, and the quantum efficiency reached 90 % under near-UV excitation. The emission intensity at 150 °C was 82 % of that at room temperature. The Raman spectra showed that recalcination had a good effect on the lattice symmetry of the samples and promoted their luminescence intensity. The experimental value of the optical bandgap of the matrix was 5.6 eV, whereas the DFT-calculated bandgap was 4.8 eV, indicating good thermal stability. The chromaticity shift of the sample at high temperatures was very small, indicating good chromaticity stability. A commercial broadband red powder and representative samples after refiring were combined with 365 nm near-UV chips. The color rendering index of the white LED devices exhibited under different driving currents was greater than 90, indicating that the refiring strategy successfully improved the luminous performance of the representative samples. KAlSiO 4 :Eu 2+ , Mn 2+ phosphors were verified to have good application prospects in the field of white LED lighting. This work provides a new idea and technology for calcination and color control of luminescent phosphors.
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
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Zhibin Ye,Ziwang Zhang,Nan Yang,Zhuo Li,Weijie Huang,Jianxin Shi
Artificial light sources have a significant impact on the cultivation of houseplants. In this work, a novel single-phase dual-emission phosphor, Ca18Na3Y(PO4)14:Eu2+,Mn2+ (CNYPO:Eu2+,Mn2+), was synthesized and the emission spectra were modulated by co-doping of Mg2+ to better match the absorption of plants. The occupancies of Eu2+, Mn2+ and Mg2+ are analyzed by using the data of bond length from XRD Rietveld refinements and the emission spectra. The energy transfer process from Eu2+ to Mn2+ is proved through the photoluminescence spectra and decay curves. Benefiting from the efficient energy transfer, two broadband emissions peaking at 500 and 650 nm can be achieved, which meets the requirements of plant growth, and the luminescence colour can be tuned from cyan to white and finally to red by changing the ratio of Mn2+ to Eu2+. The internal quantum efficiency of CNYPO:0.18Eu2+,0.18Mn2+ is 76.8% under 340 nm excitation. The introduction of Mg2+ can regulate the occupation sites of Eu2+ and the emission peak position, improve the responsiveness to the plant absorption spectra, and tune the luminescence colour to white. Finally, a white light-emitting diode (WLED) device fabricated using CNYPO:0.18Eu2+,0.18Mn2+,2.16Mg2+ on a 365 nm chip has a high colour rendering index of 89.0 and a low correlated colour temperature of 3580 K, indicating that the prepared phosphor has potential applications in plant lighting and WLEDs.
研究领域:
材料科学
·
光学工程
·
农业科学
✓ 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）