JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Sijin Liu,Guixiang Chen,Yunyun Huang,Sai Lin,Yijun Zhang,Meiling He,Weidong Xiang,Xiaojuan Liang
The formation of cesium lead halide perovskite nanocrystals are very effortless due to its extremely fast reaction kinetics. Herein, we present simple hot-inject approach and anion exchange reaction to fabricate all inorganic colloidal CsPbX 3 perovskite nanocrystals (NCs). The colloidal CsPbX 3 NCs with controlling-size exhibit the characteristics of the high luminescent intensity, superior quantum yields (QY, above 69%) and the narrow-band emission tuning, the bandgap energies and emission spectra are readily tunable over the entire visible spectral region of 425–710 nm. Moreover, the third-order nonlinear optical properties of all inorganic colloidal perovskite nanocrystals (CsPbCl 3 , CsPbBr 3 , CsPbI 3 ) were measured using the Z-scan technique, indicating excellent third-order optical nonlinearities. Nonlinear optical susceptibilities reaching to 3.78 × 10 −11 esu for CsPbBr 3 NCs, figure of merit is achieving above 5 for CsPbI 3 NCs. These interesting results demonstrate that the as-prepared all inorganic colloidal CsPbX 3 perovskite nanocrystals are expected to hold great promise for application on nonlinear optoelectronic devices .
研究领域:
纳米材料
·
光电子学
·
光子学
·
非线性光学
·
胶体化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Yang Zhou,Shuai Zhang,Xiaoming Wang,Huan Jiao
A novel red oxyfluoride phosphor K3TaO2F4:Mn4+ has been prepared by a simple two-step synthesis method. The structure, composition, and luminescence properties of K3TaO2F4:Mn4+ phosphors were investigated and discussed in detail. The real structure of K3TaO2F4 was carefully studied through X-ray powder diffraction data Rietveld refinement. K3TaO2F4 holds a D4h group symmetry [TaO2F4]3– octahedron with the oxygen occupying the para-position. Under ultraviolet (UV) and blue light excitation, K3TaO2F4:Mn4+ phosphor emits a narrow band red emission peaking at 630 nm. High-performance warm white-light-emitting diodes (WLEDs) were fabricated using a blue LED chip, YAG:Ce3+ yellow phosphor, and K3TaO2F4:Mn4+ red phosphor. This device exhibits high color quality (CCT = 3488 K, Ra = 93.0, R9 = 90.0), which indicates that Mn4+-doped K3TaO2F4 would be a promising red phosphor for WLED applications.
研究领域:
材料科学
·
光电子学
·
固态化学
·
光子学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Pengtao Tang,Haibo Shu,Mingjun Yang,Mingsong Zhang,Chuangwei Sheng,Pei Liang,Dan Cao,Xiaoshuang Chen
Monolayer transition metal dichalcogenide (TMD) alloys with tunable band gaps exhibit huge potential in nanoelectronics, optoelectronics, and photonics. The scalable production of uniform atomically thin TMD alloys is a key step for the realization of their device applications but remains a large challenge so far. Here, we report oxygen-assisted chemical vapor deposition (CVD) of uniform atomically thin MoS2(1–x)Se2x semiconductor alloys via a vertical Mo-precursor supply strategy. The growth scheme leads to the formation of highly crystalline MoS2(1–x)Se2x monolayer films within a short growth time of 8 min, which benefits from a stable and homogeneous Mo-precursor feeding environment and the synergic effect of NaBr and oxygen carrier on the growth. The high-resolution spectral characterizations and density functional theory calculations demonstrate that the chemical composition of the as-grown MoS2(1–x)Se2x monolayers can be continuously tuned from x = 0 to 1, leading to the corresponding band gap being gradually changed from 1.81 to 1.55 eV. This work provides an efficient strategy to obtain large-area uniform MoS2(1–x)Se2x monolayer alloys with tunable compositions and optical properties, which is essential for driving their applications in various functional optoelectronic devices, especially for high-performance flexible photodetectors.
研究领域:
材料科学
·
纳米电子学
·
光电子学
·
光子学
·
半导体合金
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薄膜生长
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2022
·Vol. 16
·期 12
·2200473
·
IF 10.947
Shuai Huang,Mengmeng Shang,Yu Yan,Yining Wang,Peipei Dang,Jun Lin
Phosphor-converted white light-emitting diodes (WLEDs) are extensively spread to every part of our daily life and trigger urgent needs for discovery of phosphors without cyan gap (spectral missing in the 480–520 nm range) in pursuit of “human-centric” sunlight-like full-spectrum lighting. Here, a new ultra-broadband green-emitting K 3 La(PO 4 ) 2 :Eu 2+ phosphor is reported to meet this challenge. An efficient and positive double-heterovalent substitution strategy is proved in K 3 La(Ca/Sr/Ba)(PO 4 ) 2 :Eu 2+ by the evidence of enhanced quantum yield, improved thermal stability, and the tunable luminescence color. The luminescence mechanisms are revealed in this paper. Fabricating a dichromatic 370 nm-UV chip pumped WLED using K 3 La(Ca)(PO 4 ) 2 :Eu 2+ along with a commercially available red phosphor shows a continuity spectrum comparable to the solar spectrum with excellent CIE color coordinates of (0.350, 0.347), low color-correlated temperature of 4853 K, and high color rendering index (Ra) of 96. It is shown that the double-heterovalent substitution contributes to designing and optimizing phosphors for full-spectrum WLEDs.
研究领域:
材料科学
·
光学材料
·
固态照明
·
光子学
·
发光材料
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Fangyi Zhao,Hao Cai,Zhen Song,Quanlin Liu
Trivalent chromium ion-doped near-infrared (NIR) phosphors have been widely studied due to their tunable emission wavelengths and broad applications. High Cr3+ concentration can improve absorption efficiency but generally results in low emission intensity due to the concentration quenching effect. Herein, we report a series of efficient NIR phosphors with suppressed concentration quenching, Sr9M1–x(PO4)7:xCr3+ (M = Ga, Sc, In, and Lu), showing a broadband NIR emission ranging from 700 to 1100 nm peaking at 850 nm upon the 485 nm light excitation. The emission peak position is almost independent of the type of M ion and the Cr3+ dopant content, and the type of M ion has little influence on the luminescence thermal quenching, indicating that [MO6] octahedra are rigid enough to keep octahedral volumes and average M3+–O2– distances nearly constant owing to the formation of the framework structure on Cr3+ substitution. The NIR emission intensities monotonously increase with the Cr3+ content increasing from 0 to 80% with suppressed concentration quenching, the intensity of Sr9Cr(PO4)7 still maintains 84.23% of Sr9Ga0.2(PO4)7:0.8Cr3+ phosphor, and the thermal quenching behavior is slightly dependent on x; these effects can be attributed to the suppressed energy transfer due to the structural confinement effect. The optimal sample, Sr9Ga0.2(PO4)7:0.8Cr3+, has an internal/external quantum efficiency of 66.3%/29.9%. Finally, we fabricate a NIR phosphor-conversion light-emitting diode and demonstrate its applications in nondestructive examination and medical fields.
研究领域:
材料科学
·
光学材料
·
固态化学
·
光子学
·
发光学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Fusheng Zhang,Wenna Ge,Cunli Wang,Xintong Zheng,Dongdong Wang,Xiancheng Zhang,Xue Wang,Xingya Xue,Guangyan Qing
Cellulose nanocrystals (CNCs) are powerful photonic building blocks for the fabrication of biosourced colored films. A combination of the advantages of self-assembled CNCs and multiple templating agents offers access to the development of novel physicochemical sensors, structural coatings, and optic devices. However, due to the inherent brittleness and water instability of CNC-derived materials, their further applications are widely questionable and restrictive. Here, a soft polymer of poly(vinyl alcohol) (PVA) was introduced into the rigid CNC system to balance molecular interactions, whereafter two hard/soft nanocomposites were fastened through a cross-linking reaction of glutaraldehyde (GA), resulting in a highly flexible, water-stable, and chiral nematic CNC composite film through an evaporation-induced self-assembly technique. For a 1.5 wt % GA-cross-linked 70 wt % CNC loading film, its treatment with harsh hydrophilic exposure (soaking in a strong acid, strong base, and seawater) and various organic solvents show exceptional solvent-resistant abilities. Furthermore, the film can even withstand a weight of 167 g cm–2 without failure, which is a highly stiff and durable character. Importantly, the film remains a highly ordered chiral nematic organization, being able to act as a highly transparent substrate for selective reflection of left-handed circularly polarized light, preparing fully covered and patterned full-color coatings on various substrates. Our work paves the way for applications in low-cost, durable, and photonic cellulosic coatings.
研究领域:
材料科学
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纳米技术
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光子学
·
高分子科学
·
可持续材料
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Shihai Miao,Yanjie Liang,Ruiqi Shi,Weili Wang,Yongfu Li,Xiao-Jun Wang
Blue InGaN chip-pumped short-wave infrared (SWIR) emitters have aroused tremendous attention and shown emerging applications in diverse fields such as healthcare, retail, and agriculture. However, discovering blue light-emitting diode (LED)-pumped SWIR phosphors with a central emission wavelength over 1000 nm remains a significant challenge. Herein, we demonstrate the efficient broadband SWIR luminescence of Ni2+ by simultaneously incorporating Cr3+ and Ni2+ ions into the MgGa2O4 lattice, with Cr3+ as the sensitizer and Ni2+ as the emitter. Because of the strong blue light absorption of Cr3+ and high energy transfer efficiency to Ni2+, the obtained MgGa2O4:Cr3+, Ni2+ phosphors show intense SWIR luminescence with a peak wavelength at 1260 nm and a full width at half maximum (FWHM) of 222 nm under the excitation of blue light. The optimized SWIR phosphor presents an ultra-high SWIR photoluminescence quantum efficiency of 96.5% and outstanding luminescence thermal stability (67.9%@150 °C). A SWIR light source has been fabricated through a combination of the prepared MgGa2O4:Cr3+, Ni2+ phosphor and a commercial 450 nm blue LED chip, delivering a maximum SWIR radiant power of 14.9 mW at 150 mA input current. This work not only demonstrates the feasibility of developing broadband high-power SWIR emitters using converter technology but also presents new insights into the importance of SWIR technology.
研究领域:
材料科学
·
光电子学
·
固态照明
·
光子学
·
红外发射
✓ 已验证
DOI
高影响因子
ACS Applied Optical Materials
·
2024
·
IF 0
Meng Zhao,Fangyi Zhao,Shengqiang Liu,Chuandong Wang,Zhen Song,Quanlin Liu
Near-infrared (NIR) luminescent materials activated by Cr3+ ion attracted significant attention for their tunable broadband emission, making them highly promising for applications in nondestructive testing and biomedicine fields. Nevertheless, the lack of NIR phosphors emitting above 900 nm that can be used in multiple scenarios has hindered their practical application. Inspired by the crystal field engineering, we successfully realized NIR luminescence tunable from 775 to 980 nm in niobate double perovskites A2BNbO6:Cr3+ (A = Ca, Sr, Ba; B = Ga, Sc, In). Specifically, due to unique structural distortion, Ca2.08In0.88Nb1.04O6:Cr3+ (CIN:Cr3+) exhibits a broadband NIR emission centered at 935 nm, characterized by a full width at half-maximum of 226 nm. Ultimately, by applying a layer of a CIN:Cr3+ phosphor onto the surface of a light-emitting diode (LED) chip, a type of LED device was constructed, showcasing its promising use in the realms of biological imaging and health monitoring.
研究领域:
材料科学
·
光学材料
·
固态化学
·
光子学
·
生物医学工程
✓ 已验证
DOI
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xinglai Zhang,Jing Li,Zongyi Ma,Jian Zhang,Bing Leng,Baodan Liu
Molybdenum disulfide (MoS2) as a typical two-dimensional (2D) transition-metal dichalcogenide exhibits great potential applications for the next-generation nanoelectronics such as photodetectors. However, most MoS2-based photodetectors hold obvious disadvantages including a narrow spectral response in the visible region, poor photoresponsivity, and slow response speed. Here, for the first time, we report the design of a two-dimensional MoS2/GaN van der Waals (vdWs) heterostructure photodetector consisting of few-layer p-type MoS2 and very thin n-type GaN flakes. Thanks to the good crystal quality of the 2D-GaN flake and the built-in electric field in the interface depletion region of the MoS2/GaN p–n junction, photogenerated carriers can be rapidly separated and more excitons are collected by electrodes toward the high photoresponsivity of 328 A/W and a fast response time of 400 ms under the illumination of 532 nm light, which is seven times faster than pristine MoS2 flake. Additionally, the response spectrum of the photodetector is also broadened to the UV region with a high photoresponsivity of 27.1 A/W and a fast response time of 300 ms after integrating with the 2D-GaN flake, exhibiting an advantageous synergetic effect. These excellent performances render MoS2/GaN vdWs heterostructure photodetectors as promising and competitive candidates for next-generation optoelectronic devices.
研究领域:
纳米电子学
·
光电子学
·
材料科学
·
半导体物理
·
光子学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 15
·2303018
·
IF 8
Xueqing Liu,Lu Chen,Xiaowen Huo,Feng Liu,Chuan Liao,Liangliang Zhang,Jiahua Zhang,Shaoan Zhang,Yang Li,Xiao-jun Wang,Yichun Liu
The ZnGa 2 O 4 :Cr 3+ phosphor has emerged as a significant luminescent material due to its long-lasting afterglow and near-infrared emission, making it suitable for applications in bioimaging and night-vision detection. However, the limited availability of excitation light sources poses a challenge for charging the phosphor. In this study, the charging capabilities of ZnGa 2 O 4 :Cr 3+ using visible lasers and a white flashlight as excitation sources are explored. By absorbing two excitation photons, the high-lying delocalized state of Cr 3+ can be excited through a two-step process, resulting in the filling of persistent luminescence traps and producing a long-lasting emission peaking at 696 nm. The application of the white flashlight revealed a nonlinear excitation threshold for charging at 1.5 mW cm −2 . The findings also uncovered that the excitation mechanism involves excited-state absorption and energy-transfer upconversion. Moreover, taking advantage of the unique excitability of the near-infrared persistent phosphor, the potential for charging persistent luminescent probes in vivo using chicken breast tissue as a representative model is showcased. The present upconversion charging approach may offer promising possibilities and introduce a novel excitation technique for ZnGa 2 O 4 :Cr 3+ persistent phosphor.
研究领域:
材料科学
·
光子学
·
发光材料
·
生物成像
·
光学传感
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xiaowei Yang,Yanfei Zou,Chen Hu,Shikun Su,Zhenghang Wang,Houhe Dong,Wenying Teng,Bing Teng,Bingtao Zhang,Degao Zhong
Cr4+-activated phosphors are important candidate materials for NIR-II light sources, but providing a suitable lattice coordination environment for Cr4+ and achieving long wavelength broadband emission remains a challenge. In this work, a series of Cr4+-activated ABO2 (A = Li, Na; B = Al, Ga) phosphors were successfully prepared. Due to the presence of only tetrahedral coordination structures available for Cr4+ to occupy in the matrix crystal ABO2, the valence state and luminescence stability of Cr4+ are effectively guaranteed. Through the cation substitution design of A-site (Na → Li) and B-site (Ga → Al), the [BO4] tetrahedron is distorted and expanded, which degrades the symmetry of the Cr4+ coordination crystal field. Consequently, the central wavelength of the Cr4+ emission peak is tuned from 1280 to 1430 nm, and the fwhm is significantly extended from 257 to 355 nm. Thebroadband NIR-II light sources constructed with LiAlO2: 0.03Cr4+ and NaGaO2: 0.03Cr4+ phosphors verify their important potential applications in nondestructive testing and biological imaging.
研究领域:
材料科学
·
光学材料
·
固态化学
·
光子学
·
近红外光源
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 12
·期 10
·2302300
·
IF 9
Xibao Zhang,Xiudi Wu,Yonghui Xu,Shuwen Yin,Chuansheng Zhong,Liang Zhou,Hongpeng You
For near-infrared (NIR) luminescent materials, it is a challenge to develop the next generation materials with high external quantum efficiency (EQE), low toxicity, and adjustable spectrum. The transition metal ion Fe 3+ can act as a good activator and emit NIR light in oxide host lattice, but there is limited research on this topic. Herein, authors have developed a series of Fe 3+ activated A 2 BSbO 6 :yFe 3+ (A = Ca, Sr, Ba; B = Sc, Y, Ga) phosphors with a double perovskite structure, which can efficiently convert the exciting light into NIR emission in the range of 750–1200 nm with a full-width half-maximum (FWHM) of 1372−1525 cm −1 . The NIR luminescence originates from the 4 T 1 (4G)→ 6 A 1 (6S) transition of the Fe 3+ ions situated in the octahedral sites. By employing crystal field engineering, the emission spectra peak can be adjusted within the range of 842–944 nm, and the excitation spectra can be tuned from 334 to 374 nm. These spectral adjustments enable a good match between the phosphors and commercially ultraviolet chips. When excited at 334 nm, the Sr 2 ScSbO 6 :0.1%Fe 3+ phosphor demonstrates a remarkably high EQE of 54.2% and high luminescent thermostability. These characteristics make it suitable for applications in NIR spectral detection.
研究领域:
材料科学
·
光学材料
·
固态化学
·
发光学
·
光子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）