Nanomaterials
·
2018
·Vol. 8
·期 12
·1023
·
IF 3.504
Dandan Ju,Feng Song,Adnan Khan,Feifei Song,Aihua Zhou,Xiaoli Gao,Huimin Hu,Xu Sang,Victor Zadkov
The dual-mode emission and multicolor outputs in the time domain from core-shell microcrystals are presented. The core-shell microcrystals, with NaYF4:Yb/Er as the core and NaYF4:Ce/Tb/Eu as the shell, were successfully fabricated by employing the hydrothermal method, which confines the activator ions into a separate region and minimizes the effect of surface quenching. The material is capable of both upconversion and downshifting emission, and their multicolor outputs in response to 980 nm near-infrared (NIR) excitation laser and 252 nm, and 395 nm ultraviolet (UV) excitation light have been investigated. Furthermore, the tunable color emissions by controlling the Tb3+-Eu3+ratio in shells and the energy transfer of Ce3+→Tb3+→Eu3+were discussed in details. In addition, color tuning of core-shell-structured microrods from green to red region in the time domain could be obtained by setting suitable delay time. Due to downshifting multicolor outputs (time-resolved and pump-wavelength-induced downshifting) coupled with the upconversion mode, the core-shell microrods can be potentially applied to displays and high-level security.Keywords:NaYF4:Yb/Er@NaYF4:Ce/Tb/Eu microrods;dual-mode emission;time-resolved emission spectra;multicolor emission
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Optoelectronics Letters
·
2020
·Vol. 16
·期 5
·355-359
·
IF 0
Bian Ming-jing,Zhang Hong-yan
In this work, we studied the effect of different pH values on morphology, band gap and photoluminescence (PL) properties of Eu 3+ /Tb 3+ co-doped ZnO prepared by coprecipitation method. Experimental results show that alkaline condition is more favorable for the doping of Eu 3+ and Tb 3+ ions which reduce the band gap and increases the PL intensity of UV emission (385 nm) and visible emission (400—600 nm) of ZnO. Gaussian deconvolution PL spectra show that the defects on the surface of ZnO are decreased when it is synthesized under alkaline conditions. Furthermore, both the intrinsic orange emission of Eu 3+ ions (611 nm) and the intrinsic green emission of the Tb 3+ ions (495 nm) of ZnO in this case are obtained at the same time. High intensity green and orange emission indicates that Eu 3+ /Tb 3+ co-doped ZnO is a promising PL material and has potential in emission devices.
研究领域:
材料科学
·
光电技术
·
化学
✓ 已验证
产品关联
DOI
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 40
·14325-14331
·
IF 4.39
Junfeng Qian,Huangjie Lu,Zhaofa Zheng,Miaomiao Xu,Yuan Qian,Zhi-Hui Zhang,Jian-Qiang Wang,Ming-Yang He,Jian Lin
Expanding the family of lanthanide terpyridine coordination polymers has yielded eighteen new complexes with two different phases, Ln(TPC)2(HCOO)(H2O) (Ln-1) and Ln(TPC)(HCOO)2 (Ln-2) (Ln = Sm–Lu, except Tm). Both structures are composed of lanthanide cations interconnected by 2,2′:6′,2′′-terpyridine-4′-carboxylate ligands to yield one-dimensional chain topologies. However, the incorporation of an additional crystallographically unique decorative TPC ligand into Ln-1 gives rises to a distinct phase. The encapsulation of both metal- and ligand-based phosphors within single coordination polymers leads to dual-emission of the afforded materials. Furthermore, judicious lanthanide doping in heterometallic Ln-1 and Ln-2 allows for fine-tuning the photoluminescent colours over a wide range of gamut. Such a combination showcases the capability to fine-tune the emission colours from deep green, to red, and to blue. In addition, direct white-light emission upon UV excitation can be achieved in the SmxGd1−x-1 system.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 41
·2203152
·
IF 15.153
Jingjing Wang,Shaofeng Zhang,Yunfei Li,Cuiyu Wu,Wenfei Zhang,Hailong Zhang,Zheng Xie,Shuyun Zhou
The continuous white-light emission of carbon dots (CDs) can be applied to producing multicolor laser emissions by one single medium. Meanwhile, the solid-state emission greatly contributes to its practical application. In this work, a strategy to realize the in-situ hybridization of silane-functionalized CDs (SiCDs) and 1,3,5-benzenetricarboxylic acid trimethyl ester (Et3BTC) by a one-pot solvothermal method is reported. Significantly, the SiCDs/Et3BTC hybrid crystals exhibit ultra-broadband random laser emission over the near ultraviolet-visible region under 265 nm nanosecond pulsed laser excitation. The wavelength region of laser emission is achieved from 315 to 600 nm within an emission band of CDs-based materials. It is worth noting that the wavelength range of the laser is wider than the previously reported works. It is proposed that the continuous white-light emission of SiCDs caused by multiple fluorescence centers mainly gives rise to the broadband random laser emission. Moreover, the crystals are conducive to forming resonance and realizing solid-state laser emission. This in-situ method is expected to enable a more convenient, cheaper, and greener approach to prepare luminescent hybrids for application in multicolor laser displays, multi-level laser anti-counterfeiting, supercontinuum light sources, and so on.
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 LUMINESCENCE
·
2022
·
IF 4.171
Shiyu Xiao,Shian Xie,Manbo Zhang,Shengmin Hu,Marc Adape,Jian Wang,Xinhui Zhang,Yongqin Wei,Wei Chen
Here we report two luminescent copper complexes with different structures and luminescent properties, the blue-green [CuI(dmpyHS) (PPh 3 ) 2 ]⸱CH 3 CN (CuPy-PPh 3 ) and the red [Cu 6 (dmpyS) 6 ]⸱H 2 O (CuPy). When the blue-green light (CuPy-PPh 3 ) is heated to above 147 °C, it loses the phosphine-containing ligand, PPh 3 , and turns into CuPy and instead emits red light. Many luminescent complexes show the change of luminescence properties when the temperature is lower than room temperature , while the luminescence change of CuPy-PPh 3 occurs during the heating process above room temperature. Even more interesting, the luminescence wavelength transition span is large, from blue-green light emission at 490 nm to red light at 676 nm. The luminescence of the two copper complexes covers the three primary colors of red, green and blue required for the formation of white light emitting diodes WLEDs, which has potential in the development of non-rare earth phosphor white color displays. The integration of CuPy-PPh 3 and CuPy on a 395 nm near-ultraviolet chip can assemble WLEDs with good white light properties, which provides a new way for the construction of rare earth-free phosphor WLEDs. The synthesis of the two luminescent copper complexes is simple and environmentally friendly. Even though the structures of two copper complexes have been reported, the synthesis methods are different from those in the related literature and the luminescence properties of these complexes have never been described previously. The red emission copper complex CuPy is obtained by the thermal conversion of the blue-green emission copper complex CuPy-PPh 3 , which is a new phenomenon discovered for the first time in this work.
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 Materials Chemistry C
·
2023
·Vol. 11
·期 7
·2522-2530
·
IF 6.4
Qinbin Zhang,Chuan Huang,Shilu Huang,Haijiao Xie,Qing Huang,Mingming Guo
Luminogens without recognizable luminophores are attracting increasing attention owing to their particular photophysical properties and outstanding biocompatibility features. Despite rapid advances, it is still a formidable challenge to synthesize nonconjugated fluorescent materials with efficient near-infrared emission. Unlike traditional organic luminescent materials with long-range conjugation, the limited degree of electron delocalization and large energy gap are not favorable for long-wavelength emission. Herein, we observed universal intrinsic fluorescence formed from the mixtures of itaconic anhydride (ITA) and electron-rich solvents/monomers. Further, triethylamine (TEA) could promote the ring opening of ITA and subsequently generated the zwitterionic compound (I-TEA). The photophysical properties of I-TEA showed that I-TEA had the typical characteristics of concentration enhanced emission (CEE), excitation-dependent emission (EDF), temperature-sensitive emission (TSE), and efficient red emissions (λex = 585 nm, QY = 12.63%). The cytotoxicity assay indicated that I-TEA had low toxicity for MC3T3-E1 cells and was suitable for cell imaging. In addition, the PL properties and emission source of the mixtures of ITA and electron-rich solvents (DMSO and DMF) were preliminary investigated by NMR, fluorescence, and UV-vis spectroscopy techniques and theoretical calculations. This study reveals the general intrinsic fluorescence from mixtures of ITA and electron-rich solvents or monomers and provides a strategy for preparing nonconventional luminophores with efficient long-wavelength emission.
研究领域:
材料科学
·
光化学
·
生物医学工程
·
分析化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yuhang Kuang,Jiance Jin,Gaochao Liu,Weibin Chen,Zhiguo Xia
Single-phase white-light emitters in the lighting technology overcome the challenges of re-absorption and color shift. However, achieving the broadband white emission in single-phase phosphor remains a challenge. Here, crystallized KBaScSi 3 O 9 :Eu 2+ (KBSSO:Eu 2+ ) glass-ceramics (GC) with abundant cationic sites have been developed and an ultra-broad emission band ranging from 460 to 800 nm have been found, in which the asymmetric green emission is ascribed to the Eu 2+ ions in [KO 8 ] and [BaO 7 ] polyhedra, while the red emission centered at 620 nm is originated from Eu 2+ ions in [ScO 6 ] sites. The optimized GC-converted white LED (WLED) exhibits a high color rendering index ( R a = 89.8) and low correlated color temperature (CCT = 4241 K). Moreover, the encapsulant-free GCc-WLED can operate continuously under high drive currents. This work paves the way for the design and future development of single-phase high-power white light sources.
研究领域:
材料科学
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光学工程
·
照明技术
✓ 已验证
产品关联
DOI
高影响因子
Physica Status Solidi-Rapid Research Letters
·
2021
·Vol. 16
·期 2
·2100517
·
IF 2.821
Feng Zhao,Qingfeng Bian,Yunting Chu,Yi Zhang,Qianyun Zhao,Jingchang Sun,Chengren Li
To date, it is still a challenging topic to achieve a wide tunable emission from the same sample under the excitation of a single pump source. Herein, a new sort of nanophosphor NaYO 2 :Er 3+ /Yb 3+ is prepared and characterized. In particular, the wide tunable range crossing red–yellow–green–white regions can be realized only by modulating the power density of the 980 nm semiconductor laser. The mechanism of emitting white light is discussed, and two formulae for quantitatively defining the fluorescent material's tuning ability are also offered. At the same time, the nanophosphor on hand possesses a high degree of reversibility. The nanophosphor presents comprehensive application prospects in information security, anticounterfeiting, display, and other fields.
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 Materials Chemistry C
·
2020
·Vol. 8
·期 20
·6710-6714
·
IF 7.059
Dong Li,Wentao Wu,Sasa Wang,Xinyuan Zhang,Lina Li,Yunpeng Yao,Yu Peng,Junhua Luo
White-light emissive hybrid perovskites have received continuous attention because of their potential applications in solid-state lighting and displays. However, there have been limited reports about dual-emissive white-light hybrid perovskites, although they enable a wide range of emission switching. Here, we report a one-dimensional hybrid perovskite, (N-AEP)2Pb2Cl10·H2O (NAPC, N-AEP = 1-piperazineethylammonium), which exhibits dual-emissive photoluminescence with a wide emission switch ranging from blue to orange. Significantly, tunable white-light emission from “cold” white light (0.25, 0.29) to “warm” white light (0.40, 0.42) can be easily observed by finely tuning the excitation wavelength. Under excitation at 335 nm, a “cold” white light with chromaticity coordinates (0.31, 0.33) close to those of “optimal” white light (0.33, 0.33) is achieved. Furthermore, NAPC exhibits a color rendering index reaching 93.4, which is among the highest values currently reported from white-light emissive hybrid perovskites. This work paves a way to tune the photophysical properties of hybrid perovskites, and highlights their potential for solid-state lighting applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Yuanyuan Li,Puxian Xiong,Gaochao Liu,Mingying Peng,Zhijun Ma
Bismuth (Bi)-activated luminescence materials have attracted much attention for their tunable broad emissions ranging from a visible to near-infrared (NIR) region. However, it remains a challenge to regulate the Bi valence state and achieve NIR emission via a facile way. Here, we report the design and preparation of Ba3Sc4O9:Bi phosphors, which emit visible and NIR emissions simultaneously even prepared in the air condition. The self-reduction mechanism of Bi3+ species in Ba3Sc4O9 with a rigid crystal structure is illustrated based on the charge compensation model, and the coexistence of different Bi-active centers, Bi3+ for visible emission, while Bi+ and Bi0 for NIR emission, is confirmed by the spectroscopic data and X-ray photoelectron spectroscopy (XPS) analysis. The enhanced NIR emission was further achieved through controlled reducing treatment and the related mechanism has also been clarified. This work paves a new way to control bismuth valence and tune the emission of Bi-based luminescence materials for emerging photonics applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Yubin Zhao,Xiao Zhang,Cong Xie,Wenbin Shi,Ping Yang,San Ping Jiang
Although inorganic cesium halide lead perovskite nanocrystals (NCs) exhibited tunable photoluminescence (PL), it is still a challenge for such NCs with multicolor and white emission for application. In this article, as-synthesized Mn:CsPbCl3 NCs were treated using an oleoamine solution of CdX2 (X = Cl, Br) to get a high PL quantum yield (PLQY) and stability. CdCl2 passivated the surface defects of Mn:CsPbCl3 NCs through anion exchange to get high PL intensity, especially to increase Mn emission. The PLQY of the sample was increased from 15 to 85% after ion exchange. Furthermore, the treatment of CdBr2 resulted in the appearance of a powerful blue emission peak, and the PLQY increased to 95.7%. The PL decay kinetics of samples was studied before and after treatment. Mn2+ emission in Mn:CsPb(Cl/Br)3 NCs was increased because of the reaction of CdBr2 and Mn:CsPbCl3 NCs. Interestingly, the tunable and bright white emission from Mn:CsPb(Cl/Br)3 NCs was obtained by controlling the amount of Br. The controlling of Mn emission plays an important role in changing the Commission Internationale de l’Eclairage color coordinates. Because of bright and tunable PL, the NCs may be used in white-light-emitting diodes.
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 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
危险品化学品经营许可证（带存储）