Optical Materials Express
·
2016
·Vol. 6
·期 2
·374-380
·
IF 2.657
X. Y. Chen,Z. J. Zhang,F. F. Xu,S. Q. Shi,J. T. Zhao
A color-tunable fluorescence composite bulk based on carbon dots and Y2WO6: Eu3+ as blue and red emitting materials, respectively, was fabricated. Due to the different excitation regions of the two materials, the emission color of the composite can be tuned from red, across magenta into the blue via varying excitation wavelengths. At the same time, the material is still considerably optically transparent, which demonstrates a clear advantage for integration into real applications.
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 LUMINESCENCE
·
2019
·
IF 2.961
Tong Song,Yue Zhao,Katarzyna Matras-Postolek,Ping Yang
Using carbon spheres and sucrose as the carbon sources, two kinds of color-tunable carbon dots (Cdots) named as Cdots-C and Cdots-S were prepared via change the solution concentration. As the concentration of Cdots solution increased, varying degrees of self-assembly occur between monodisperse Cdots. Hence aggregates with different types formed, which can be observed. Appearance of new excitation bands at 465 and 520 nm caused by H- and J-type Cdots aggregates caused the emission at long wavelengths. At the same time, the excitation band at 300–400 nm induced blue-green emission and the competitions of three excitation bands resulted in the color-tunable PL behaviour which cover the region from green to red emission. The difference of carbon sources of Cdots-C, Cdots-S and Cdots-G (graphite) explained the reason why concentration-dependent PL behaviour were not observed in Cdots-G at a high solution concentration. The process of self-assembly were ascribed to hydrogen bonding interaction between abundant hydroxyl groups on the surface of Cdots-C and Cdots-S. This work provided a simple approach to modulate photoluminescence (PL) color of Cdots and will extend the application in bioimaging.
研究领域:
材料科学
·
生物成像
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Qingling Zeng,Wenxiang He,Fangfei Luan,Dongcai Guo
A novel BaCeF 5 : Tb 3+ , Eu 3+ color-tunable phosphor was synthesized using a co-precipitation-hydrothermal method. The photoluminescence (PL) spectra revealed that BaCeF 5 has its own fluorescence effect as blue emission. The energy transfer process from Ce 3+ to Tb 3+ was achieved after doping with Tb 3+ , enabling the conversion of the luminous color from blue to green. By doping Eu 3+ in BaCeF 5 : 10 %Tb 3+ , the energy transfer process from Tb 3+ to Eu 3+ was further realized and the transition from green to orange light continued in the phosphor. Finally, the energy transfer mechanism of Ce 3+ -Tb 3+ -Eu 3+ in the BaCeF 5 : Tb 3+ , Eu 3+ samples was explored. The results indicate that by varying the Tb 3+ and Eu 3+ concentrations, the phosphor transition from blue - green - orange light can be performed, which is a promising material to be applied to multicolor emission modulated luminescent materials as well as incandescent lamp materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-7
·
IF 3.125
Zhang Guilin,Mei Shiliang,Wei Xian,Wei Chang,Yang Wu,Zhu Jiatao,Zhang Wanglu,Guo Ruiqian
In this letter, dual-emissive and color-tunable Mn-doped InP/ZnS quantum dots (Mn:InP/ZnS QDs) with the absolute photoluminescence quantum yield (PL QY) up to 78% were successfully synthesized via a growth-doping method. The dual emission of Mn:InP/ZnS QDs is composed of intrinsic emission and Mn-doped emission, which can be tuned by different Mn/In ratios. With the increase of Mn dopant concentration, the intrinsic emission shows a red shift from 485 to 524 nm. The new class of dual-emissive QDs provides potential for future application in white LED.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 3
·1270-1277
·
IF 3.049
Yufeng Zhang,Jie Xiong,Dingyi Shen,Wenpeng Xia,Jie Yu,Yanfei Zhang,Jun Yang,Shanshan Hu,Yuxin Wan,Haili Wen,Hang Ye,Yucan Liu
A series of color-tunable emitting Na3Sc2(PO4)3:Ce3+/Tb3+/Eu3+ (NSPO) phosphors were prepared by a combination of hydrothermal synthesis and low temperature calcination. The phase structure, photoluminescence and energy transfer properties of the samples were studied in detail. The tunable colors were obtained by co-doping the Tb3+ ions into the NSPO:Ce3+ or NSPO:Eu3+ phosphors with varying concentrations. Under UV excitation, the energy transfers from Tb3+ to Eu3+ in the NSPO host occurred mainly via a dipole–dipole mechanism, and the critical distances of the ion pairs (Rc) was calculated to be 17.94 Å by the quenching concentration method. And that, the emission colors of the NSPO:Tb3+,Eu3+ phosphors could be adjusted from green through yellow to red because of the energy transfer from Tb3+ to Eu3+. Based on its good photoluminescence properties and abundant emission colors, the NSPO:Ce3+/Tb3+/Eu3+ phosphors might be promising as potential candidates for solid-state lighting and display fields.
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
MATERIALS LETTERS
·
2018
·
IF 2.687
Yannan Qian,Xunze Tang,ZhengYu Zhang,Haiyan Zhang,Maxim Ivanov,Qibai Wu
A novel multicolor-tunable lanthanide doped 12CaO·7Al 2 O 3 (Ln 3+ :C12A7; Ln 3+ = Yb 3+ , Tm 3+ and Er 3+ ) synthesized by solid-state reaction method would greatly enhance the scope of its applications ranging from infrared solar cells to field emission display . The scanning electron microscopy (SEM) was used to characterize the morphology of Ln 3+ :C12A7. Under 980 nm excitation, the emission color was tuned from green-yellow to red region through adjusting the concentrations of Ln 3+ ions. The obtained near infrared upconversion (UC) emissions in Ln 3+ :C12A7 was corresponded to “window of optical transparency”. All blue, green and red UC emissions were populated by one-photon process, and the proposed UC mechanisms were studied in Ln 3+ :C12A7.
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 SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 7
·6832-6837
·
IF 2.195
Li Chunzhe
A series of Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ and Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ /Mn 2+ phosphors were fabricated by a solid state reaction. The phase composition and luminescent properties of the fabricated phosphors were investigated. The XRD patterns show that Eu 2+ and Mn 2+ were doped into the Ca 3 La 6 (SiO 4 ) 6 host in the present experiment. The Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ phosphors show the emission band in blue region and the Ca 3 La 6 (SiO 4 ) 6 :Mn 2+ phosphors exhibit the emission band in yellow region. The excitation band of Ca 3 La 6 (SiO 4 ) 6 :Mn 2+ overlaps with the emission band of Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ that means a possibility for the energy transfer process from Eu 2+ to Mn 2+ in the Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ /Mn 2+ phosphors. Tunable luminescence was obtained due to this energy transfer process and warm white light was emitted by Ca 3 La 6 (SiO 4 ) 6 :0.05Eu 2+ /0.04Mn 2+ and Ca 3 La 6 (SiO 4 ) 6 :0.05Eu 2+ /0.05Mn 2+ phosphors.
研究领域:
材料科学
·
无机化学
·
固体物理
·
发光材料
·
光学材料
✓ 已验证
DOI
高影响因子
Light-Science & Applications
·
2025
·Vol. 14
·期 1
·1-10
·
IF 23.4
Li Haotao,Wang Jiming,Chen Shuming
The realization of solution-processed tandem quantum-dot LEDs (QLEDs) remains a technical challenge due to the limitations of inefficient interconnect layer and the damage caused by multiple solution processes. Here, we develop a high performance tandem QLED by face-to-face integrating a top-emitting QLED with a transparent QLED. The top and bottom units can be addressed independently, thereby enabling the tandem QLED to operate in series, parallel, and color-tunable modes for multifunctionality. In series mode, QLEDs demonstrate an ultra-low turn-on voltage of 3.3 V and a record-breaking external quantum efficiency of 60.7%. In parallel mode, QLEDs achieve an impressive brightness of over 4.8 × 10 6 cd m -2 . In color-tunable mode, the color, brightness, and color temperature can all be adjusted with a color tuning range of 114% NSTC. Moreover, both series and parallel connections contribute to an improved stability, resulting in a T 95 lifetime of nearly 30,000 h at 1000 cd m -2 , which is an improvement of approximately 2.8 times over control devices. Our work offers a feasible solution for achieving multifunctional tandem QLEDs with the advantages of solution processed, high efficiency, high brightness, long lifetime and full color tunability for various light source applications.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 9
·4325-4341
·
IF 3.5
P. J. Xia,X. Z. Zheng,L. Yue,Y. F. Lei,M. Xu,W. B. Dai
For further development of light sources, white light-emitting diodes (wLEDs) have attracted widespread attention as promising next-generation light sources fabricated via the combination of phosphors and LED chips. However, latent defects, such as chemical/thermal instability, low color rendering index (CRI) and high correlated color temperature (CCT), of current mainstream wLEDs seriously hinder their further large-scale implementation. Herein, in order to overcome these limitations, single-phase color-tunable gaudefroyite (Ca3Y(GaO)3(BO3)4 (CYGB)) tridoped with Bi3+/Tb3+/Eu3+ ions was synthesized for the first time and detailed characterisation was performed via high-temperature solid-state reaction and structural/spectral analyses, respectively. Radius difference percentage calculations and Rietveld refinements indicate that dopants occupy both Y3+ and Ca2+ sites but preferably the Y3+ site over the Ca2+ site due to the same valence state. Through subtly regulating the (co)doping contents and skillfully utilizing the energy transfer (ET) strategy from the allowed transition of blue light-emitting Bi to the forbidden transition of green/red light-emitting Tb/Eu, the color hue (including white light) of highly efficient PL can be easily tuned according to the need. Meanwhile, composition/content-optimized white light-emitting CYGB:2%Bi/10%Tb/12%Eu also shows splendid chemical/thermal stability. Finally, as a proof-of-concept experiment, the CYGB:2%Bi/10%Tb/12%Eu phosphor-converted wLED (pc-wLED) was fabricated and encapsulated via the up-to-date remote ‘capping’ method, which imparted attractive performances. Altogether, the stable CYGB:Bi/Tb/Eu phosphor is a promising candidate for application in lighting/display fields.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Yuexin Wang,Yanhua Song,Xiuqing Zhou,Yi Li,Tingting Cui,Keyan Zheng,Ye Sheng,Haifeng Zou
A series of color-tunable emitting LuVO 4 :Tm 3+ ,Dy 3+ ,Eu 3+ microspheres were successfully synthesized by a solvothermal process. The structure was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results revealed that the sample is pure tetragonal phase of LuVO 4 and consists of 3D-hierachical microspheres with the diameter about 2 μm. Additionally, the possible formation mechanism of microspheres was proposed. Furthermore, the photoluminescence properties of LuVO 4 :Dy 3+ ,Eu 3+ samples were investigated in detail. Both blue and yellow emissions corresponding to the 4 F 9/2 - 6 H 15/2 , 4 F 9/2 - 6 H 13/2 transition of Dy 3+ ions and red emission corresponding to the 5 D 0 - 7 F J (J = 1, 2, 3, 4) transition of Eu 3+ ions can be observed in LuVO 4 :Dy 3+ ,Eu 3+ phosphors under 366 nm near-ultraviolet radiation. The energy transfer process between Dy 3+ and Eu 3+ was demonstrated to be resonant type via dipole-quadrupole mechanism. Additionally, when co-doping Dy 3+ with Tm 3+ or Eu 3+ or tri-doping Tm 3+ ,Dy 3+ ,Eu 3+ ions in the single component, the colorful emitting can be obtained by giving abundant blue, green, red, yellow, orange, especially white-light-emission. This type of color-tunable luminescence phosphors may have promising application in solid state lighting application.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Matter
·
2024
·
IF 17.3
Xiaoyu Hou,Kaiyue Zhang,Xintao Lai,Liwei Hu,Florian Vogelbacher,Yanlin Song,Lei Jiang,Mingzhu Li
Passive daytime radiative cooling is regarded as a promising technology to achieve all-day subambient cooling without energy consumption and pollution. The installation of monotonous white radiative cooling coating on the facades of buildings poses challenges in terms of aesthetic integration. Fabricating radiative cooling coatings with different colors and high cooling efficiency at a low cost is an optimal solution for their broad adoption and commercialization. Here, inspired by the elytra of the scarab beetle, we design a hierarchically porous nested structured radiative cooling film with high subambient cooling efficiency and flexible color tunability. This film exhibits both high solar reflectance (93.4%) and superior thermal emissivity (92.3%), realizing subambient cooling of ∼10.2°C at night and ∼7.2°C at midday. Its color is brilliant, stable, and flexible. Additionally, this film is self-cleaning and can reduce noise, which suggests possibilities for the development of multifunctional radiative cooling surfaces in building envelopes, automobile coatings, and clothes.
研究领域:
材料科学
·
建筑技术
·
热能工程
✓ 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）