ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
·
2023
·Vol. 78
·期 10
·921-926
·
IF 1.8
Cong Liu,Junshen Xing,Zheng Liu,Wenlin Feng
BaSr 2 (PO 4 ) 2 : 4 %Eu 3+ , 4 % A ( A = Li + , Na + , K + ) phosphors were prepared by high-temperature solid-phase method. The crystal structure, photoluminescence properties, thermal stability, chromaticity coordinates, and fluorescence lifetime of the samples were investigated. The excitation and emission spectra of the samples are broadbands and the maximum peak of the emission spectrum is located at 619 nm. Among three charge compensators, the luminescence intensity is optimal for Li + co-doping case, and the quenching temperature of the typical sample is about 500 K. the fluorescence lifetime
τ
is 1469.6 ns, and the chromaticity coordinates exhibit a strong red emission. The present phosphor has a potential application for white light-emitting diodes (LEDs) under the near-ultra violet (n-UV) light excitation.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Ziqian Lv,Hanyu Xu,Zhiying Wang,Mochen Jia,Yanling Wei,Zuoling Fu
The composite of biocompatible carbon dots (CDs) and lanthanide-based luminescent materials have high research value as a promising multifunctional material, which are ideally suited to information encryption and white LED. However, the aggregation-induced quenching of CDs in the solid state still troubles the synthesis of CDs with other solid luminescent materials. Herein, a facile strategy to fabricate polychromatic nanoplatform KLa(MoO 4 ) 2 : Eu 3+ @CDs by encapsulating CDs on the surface of KLM: Eu 3+ with silicon shell is reported, in which the aggregation-induced quenching of CDs is avoided. Due to the overlapping of Eu-O charge transfer band with CDs excitation band, the red luminescence of Eu 3+ ions and the blue fluorescence of can be emitted simultaneously under 395 nm excitation. By changing the proportion of KLa(MoO 4 ) 2 : Eu 3+ in KLa(MoO 4 ) 2 : Eu 3+ @CDs, the mixture can emit "warm", "neutral", and "cold" white light, which can realize people's demand for indoor lighting requirements. Furthermore, a multi-mode information encryption by selectively triggering the luminescence of CDs or Eu 3+ ions is also designed. All the results suggest that KLa(MoO 4 ) 2 : Eu 3+ @CDs have excellent luminescence properties that can be further investigated and applied in the field of white LEDs and information encryption.
研究领域:
材料科学
·
光学
·
信息加密技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 5
·1690-1697
·
IF 8.067
Mengmeng Cao,Chao Xia,Yunpeng Liu,Jinfeng Xia,Danyu Jiang,Guohong Zhou,Tongtong Xuan,Huili Li
Rapid and quantitative detection of nitrobenzene (NB) in wastewater is of great significance to protect the natural environment and human health. In this work, bifunctional Ln@Zr-MOFs based on UiO-66 were successfully fabricated by partially replacing terephthalic acid (H2BDC) ligands with m-phthalic acid (m-H2BDC) ligands and post-synthetic modification (PSM) with Ln3+ (Ln3+ = Eu3+, Tb3+). The “antenna effect” of the m-H2BDC ligands makes Ln@Zr-MOFs exhibit the characteristic emissions of Ln3+. By adjusting the amount and type of Ln3+, controllable color-tuning emissions can be easily realized, which endows them with a great application prospect for white LEDs. On the other hand, Eu10@Zr-MOFs can serve as a turn-off fluorescent switch of NB because the red emission from Eu3+ can be easily quenched by NB through a photoinduced electron transfer (PET) process between NB and its ligands, and as a result, NB is successfully recognized. Particularly, Eu10@Zr-MOFs as a fluorescent probe have shown many appealing properties, such as high sensitivity (limit of detection is 1.04 μM, limit of quantification is 3.48 μM, and Ksv = 24459.71 M−1), quick response (less than 60 s), a broad response window (0–180 μM), excellent selectivity, and strong anti-interference ability. The real detection results of NB concentration in natural water samples have demonstrated that the reported Eu10@Zr-MOFs are a potential fluorescent material that can precisely and sensitively perform fluorescence sensing of NB.
研究领域:
材料科学
·
环境科学
·
光学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 8
·1744-1751
·
IF 2.578
Zhongyang Wang,Ali Hasnain,Xujun Sun,Ying Han,Dongshun Liu,Xiaohua Tan,Xiang-Kui Ren,Yakai Feng
In recent years, fluorescent carbon dots (CDs) have been developed and showed potential applications in biomedical imaging and light-emitting diodes (LEDs) for their excellent fluorescent properties. However, it still remains a challenge to incorporate fluorescent CDs into the host matrix in situ to overcome their serious self-quenching. Herein, a one-pot hydrothermal method is used to prepare nano-zirconia with CDs (CDs@ZrO 2 ) nanoparticles. During the reaction, CDs and nano-zirconia are generated simultaneously and connected with silane coupling agent. The CDs@ZrO 2 nanoparticles exhibit tunable emission wavelength from 450 to 535 nm emission by regulating the content of citric acid in the feed. The quantum yield of the CDs@ZrO 2 is up to 23.8%. Furthermore, the CDs@ZrO 2 nanoparticles with regulable fluorescence emission can be used for the fluorescent material to prepare white LEDs. The prepared LED has significant white light emission with color coordinates of (0.30, 0.37) and its color rendering index (CRI) is 67.1. In summary, we have developed the solid-state CDs@ZrO 2 nanoparticles with tunable emission by a valuable strategy, that is, one-pot method, for white LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Yantong Lu,Guangshe Li,Sixian Fu,Shaofan Fang,Liping Li
CsCu2I3 mixed with Cs3Cu2I5 has shown potential applications as white-light-emitting materials, while their growth, structural evolution behaviors, and their impact on photoluminescence of CsCu2I3 nanocrystals (NCs) are still not known. In this work, we investigated the growth and structural evolution of CsCu2I3 nanocrystals with increasing reaction temperature. At low temperature and in the presence of a high dosage of oleic acid and oleylamine, Cs3Cu2I5 nanoparticles, rather than CsCu2I3 NCs, preferred to form in the hot-injection reaction system. Increasing the reaction temperature promoted the formation of CsCu2I3 nanorods. Phase-pure CsCu2I3 nanorods were steadily obtained at 180 °C. Structural evolution from less copper-containing NCs to copper-rich ones in the low-temperature reaction condition is highly related to the coordination of copper ions with OAm. More importantly, accompanying the growth of nanorods and structural evolution from Cu3Cs2I5 to CsCu2I3, the color of photoluminescence emission of NCs changed from blue to nearly white and to yellow, but their photoluminescence quantum yield decreased from 36.00 to 9.86%. The finding in this work would give a view to the structural evolution of copper-containing perovskite-like halides, being helpful for adjusting their photoluminescence in white LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
LUMINESCENCE
·
2015
·Vol. 31
·期 2
·388-393
·
IF 1.518
Renping Cao,Kangbin Chen,Shenhua Jiang,Zhiyang Luo,Xiaoguang Yu,Pan Liu
A series of SrMoO 4 :Sm 3+ ,Tb 3+ ,Na + phosphors was synthesized using a high-temperature solid-state reaction method in air. On excitation at 290 nm, SrMoO 4 :Sm 3+ ,Tb 3+ phosphor emitted light that varied systematically from green to reddish-orange on changing the Sm 3+ and Tb 3+ ion concentrations. The emission intensities of SrMoO 4 :Sm 3+ and SrMoO 4 :Sm 3+ ,Tb 3+ phosphors were increased two to four times due to charge compensation when Na + was added as a charge compensator. The luminescence mechanism and energy transfer could be explained using energy-level diagrams of the MoO 4 2– group, Sm 3+ and Tb 3+ ions. SrMoO 4 :Sm 3+ ,Tb 3+ ,Na + could be used as reddish-orange phosphor in white light-emitting diodes (LEDs) based on an ~ 405 nm near-UV LED chip. This research is helpful in adjusting and improving the luminescence properties of other phosphors. Copyright © 2015 John Wiley & Sons, Ltd.
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 MOLECULAR STRUCTURE
·
2024
·
IF 4
Bing Zhang,Yixin Luo,Binqiong Peng,Lisha Zhang,Ning Xie,Dan Yue,Weidong Li,Bowen Qin,Wenjing Du,Zhenling Wang,Yilei Zhang
The paper presents a green and easily prepared water-soluble fluorescent nitrogen doped carbon dots (N CDs) synthesized by one-step hydrothermal process. The N CDs displays brilliant blue fluorescence excited by UV light, with excellent water solubility, and a quantum yield of 15.7 %. The fluorescence intensity of N CDs remains unchanged after 48 h of exposure to ultraviolet light, exhibiting good photostability. Moreover, the ion sensing characteristics of these N CDs have been explored for more than a dozen anions and cations. The result reflects that this fluorescent CDs exhibits excellent sensitivity and selectivity for Fe 3+ within a range spanning of 40 ∼ 500 μΜ with a limit of detection down to 0.22 μΜ. The principle of sensor sensing is likely related to the formation of the internal filtering effect (IFE), which leads to a decline in the fluorescence intensity of N CDs in aqueous solutions containing Fe 3+ . Due to the excellent water solubility, good photostability and high yield of N CDs, the application of prepared N CDs/polyvinyl alcohol (PVA) as fluorescent materials for white LED devices was explored. The prepared N CDs/PVA (NCP) composite film can also exhibit bright blue light under 365 nm excitation, indicating good application prospects in the area of white LED devices and agricultural films.
研究领域:
材料科学
·
光学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
AIP Advances
·
2018
·Vol. 8
·期 1
·
IF 1.653
Peng Bing,Song Kaixin,Zhang Shuangshuang,Shen Shaohua,Xu Junming,Wu Jun,Su Weitao
SrLa 4-x-y Si 3 O 13 : xTb 3+ , yEu 3+ phosphor was prepared by high temperature solid-state method. The luminescent centers of Eu 3+ and Tb 3+ occupying La 3+ lattice sites in hosts were confirmed by Rietevld refinement method. The phenomenon of self-cross-relaxation energy transfer is observed between Tb 3+ ions from 5 D 4 - 7 F J to 7 F 6 - 5 D 4 transition. Additionally, the direction of energy transfer (ET) was observed from Tb 3+ to Eu 3+ ions, and ET efficiency became more efficient as the concentration of activator increases. The type of ET between Tb 3+ and Eu 3+ ions was demonstrated to be the dipole-dipole mechanism. The multi-color lights were realized covering the green to red visible region by the route of energy transfer. Furthermore, the decrease of Eu 3+ emission intensity resulting from thermal quenching can be effectively compensated by Tb 3+ →Eu 3+ ET. The excellent luminescent properties and thermal stability show this phosphor to be a promising candidate for white LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 12
·1-13
·
IF 2.8
Wang Leilei,Ji Xiaohui,Xiao Kefeng
A series of red-luminescence bismuthate phosphors of double perovskite BaBiNaTeO 6 doped with trivalent europium (Eu 3+ ) were prepared by the solid-state diffusion method. The crystal structure and phase purity of the phosphors were analyzed. The photoluminescence (PL) properties of BaBiNaTeO 6 :Eu 3+ were studied in detail. Upon blue light (466 nm) excitation, the powders showed brilliant red light at around 619 nm, and it was attributed to the electric dipole (ED) 5 D 0 → 7 F 2 transition of Eu 3+ . The optimal dopant concentration ( x ) of the as-prepared phosphor was x = 0.60 mol and the concentration quenching mechanism was evaluated as the electric quadrupole–quadrupole interaction. The BaBiNaTeO 6 :Eu 3+ exhibited good thermal stability and the corresponding activation energy ( E a ) was obtained to be 0.27 eV. The chromaticity points of phosphors were near the edge of the red region of the Commission Internationale De L’Eclairage (CIE) 1931 chromaticity diagram. As-prepared white LED based on the GaN blue chip exhibited relatively low correlated color temperature (CCT) of 5042.5 K and high color rendering index (CRI) of 91.6. All characterizations suggest that these double perovskite BaBiNaTeO 6 :Eu 3+ red-emitting phosphors have promising applications in illumination and display field based on blue LEDs.
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 SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Yue-Yu Ma,Hong-Mei Pan,Dong-Yang Li,Yu-Hang Liu,Tian Lu,Xiao-Wu Lei,Zhihong Jing
Low-dimensional hybrid antimony halide perovskites have fascinated the extensive research for their excellent photoluminescence behaviors. However, reasonable optimization of luminescence performance through molecule-level structural regulation remains a formidable challenge. The solution evaporation method with the reaction of organic amines and acid solutions of metal salts is a well-established method for the synthetic of low-dimensional hybrid antimony halide . In this work, by selecting organic cations with different sizes as template molecules, we have successfully synthesized three hybrid antimony halides of 0D [HDBA] 2 SbCl 5 ( 1 ), 0D [H 2 ATMP] 2 SbCl 7 ( 2 ) and 1D [H 3 PMDETA]Sb 2 Cl 9 ( 3 ) (DBA = dibutylamine, ATMP = 4-amino-2,2,6,6-tetramethylpiperidine, PMDETA = N,N,N′,N″,N″-pentamethyldiethylenetriamine). by the solution evaporation method at room temperature for 2–5 days. These hybrid antimony halides exhibit broadband yellow-light with the highest photoluminescence quantum yield (PLQY) of 8.38%. According to detailed spectroscopy characterizations and theoretical calculations, the broadband light emissions should originate from self-trapped excitons (STEs). These antimony halides could be fabricated as white LEDs with highest color rendering index (>90%). The intrinsic broad-band light emissions and facile assembly process enable these hybrid antimony halides as promising candidates for yellow-light emitting materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Hua Yu,Bingxue Yao,Degang Deng,Leifeng Chen,Hongting Zhao,Yinqun Li,Youjie Hua,Shiqing Xu
A novel tunable red to yellow emitting phosphor, (Ca, Ba) 4 (PO 4 ) 2 O:Eu 2+ is reported that displays a broad emission from 500 to 800 nm, and its emitting color can be adjusted from red to yellow by changing Ba 2+ doping concentration. X-ray powder diffraction (XRD) analysis confirmed the phase formation. Excitation and emission spectra, and concentration dependence of emission intensity of the phosphor were investigated. The results showed that the emission peak wavelength take blue-shifted from 640 to 545 nm and the color hue can be tuned from red to yellow with increasing Ba 2+ concentration. When single-phase (Ca 3.85 Ba 0.10 )(PO 4 ) 2 O:0.05Eu 2+ phosphor is pumped by a blue InGaN light-emitting diode, we obtain white light with color rending index ( R a ) between 84.0 and 90.6 and color temperatures between 4000 and 5500 K, which suggests that this material is competitive as a color conversion material for solid state lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Di-Wei Zhang,Wei Zhou,Zhi-Guo Xia,Ze Zhang,Xiu-Ting Li
Red-emitting CdTe@SrSO 4 composites phosphors have been successfully fabricated via a two-step precipitation and following electrostatic assembly process. By adjusting the molar ratio of [Sr 2+ ]/[SO 4 2− ], the morphologies of SrSO 4 products vary from rods to rhombs with the increasing thickness, and comparative luminescence properties and phase formation mechanism of as-prepared CdTe@SrSO 4 composites have been investigated. The CdTe@SrSO 4 composites with a rod-like shape show optimum luminescence properties, as well as relatively good thermal stability. White LED prototype based on the CdTe@SrSO 4 composites has been fabricated, and a CIE coordinate of (0.400, 0.389), the correlated color temperature (CCT) of 3600 K, and color rendering index (CRI) of 94.3 can be achieved. The results indicate that CdTe@SrSO 4 composites may have potential in phosphor-converted white LEDs.
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
危险品化学品经营许可证（带存储）