OPTIK
·
2021
·
IF 2.443
Yaoyao Yang,Xiao Min,Mengzhu Hu,Bingfa Liu,Yuheng Wu,Yuansheng Wu,Lixin Yu
In this study, a dual photoluminescence (PL) carbon quantum dots (CQDs) are obtained using two common raw materials, phenylenediamines and phosphorus acid, with a one-step hydrothermal method . The three typical CQDs are obtained by using three phenylenediamine isomers as carbon source, which can emit a bright and stable turquoise, green and yellow light under a single ultraviolet-light excitation, respectively. In addition, the effect of reaction temperature and ambient pH on the performance of CQDs is systematically researched in the hydrothermal process. The results show that tunable optical properties of CQDs can be achieved by changing the reaction temperature, carbon sources and the surrounding pH value.
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 ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 6
·3869-3876
·
IF 1.774
Cao Renping,Jiao Yuming,Wang Xuantian,Ouyang Xun,Chen Ting,Wan Huijun,Fan Ting,Xie Shikun
In this work, CaTiSiO 5 :Ce 3+ and CaTiSiO 5 :Ce 3+ , Mn 2+ phosphors are prepared in air via the high-temperature solid-state reaction method. The crystal structure, phase purity, and luminescence properties of the samples are investigated. CaTiSiO 5 :Ce 3+ phosphor under excitation at 320 nm emits mazarine light with chromaticity coordinates (0.1693, 0.0053) and optimal Ce 3+ doping concentration of ∼ 6 mol.%. CaTiSiO 5 :6%Ce 3+ , Mn 2+ phosphor with excitation at 320 nm shows a tunable color emission from yellow to red-orange with increasing Mn 2+ concentration from 1 mol.% to 8 mol.%, the corresponding chromaticity coordinates are changed from (0.4302, 0.4507) to (0.5475, 0.3916), and the corresponding lifetimes decrease from 34.22 ns to 16.33 ns. The energy transfer (ET) process between Ce 3+ and Mn 2+ ions is confirmed by the spectral properties and lifetimes of CaTiSiO 5 :6%Ce 3+ , Mn 2+ phosphor, with ET efficiency reaching ∼ 52.28%. The luminescence mechanism is explained by the energy level diagrams of Ce 3+ and Mn 2+ ions. The experimental results are of benefit for research and improving the tunable emission of other phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 4
·619
·
IF 3.164
Junhua Tong,Songtao Li,Chao Chen,Yulan Fu,Fengzhao Cao,Lianze Niu,Tianrui Zhai,Xinping Zhang
A random laser was achieved in a polymer membrane with silver nanoflowers on a flexible substrate. The strong confinement of the polymer waveguide and the localized field enhancement of silver nanoflowers were essential for the low-threshold random lasing action. The lasing wavelength can be tuned by bending the flexible substrate. The solution phase synthesis of the silver nanoflowers enables easy realization of this type of random lasers. The flexible and high-efficiency random lasers provide favorable factors for the development of imaging and sensing devices.Keywords:polymer waveguides;plasmonics;random laser;tunable
研究领域:
光学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Renping Cao,Tengyu Huang,Jingheng Nie,Lei Zhang,Yuyu Chen,Lan Li,Bang Lan,Jing Wang
New tunable-color luminescent materials are getting a lot of attention. Double-doped activated ions are an important research method. Here, CaSrNb 2 O 7 :R 3+ (R 3+ = Sm 3+ , Bi 3+ , and Sm 3+ /Bi 3+ ) are synthesized by solid state method in the air. Phase purity and successful synthesis of samples are confirmed by X-ray diffractometer (XRD) patterns and energy disperse spectroscopy (EDS) diagram. The luminescence properties of samples are studied. CaSrNb 2 O 7 :Sm 3+ has an excitation spectrum due to the O 2- - Sm 3+ charge transfer band (CTB) and the 6 H 5/2 → 4 H 9/2 , 4 D 3/2 , 4 D 1/2 , 4 F 7/2 , and 4 I 11/2 transitions of Sm 3+ ion. The red-orange emission of CaSrNb 2 O 7 :Sm 3+ is observed because of the 4 G 5/2 → 6 H 5/2 , 6 H 7/2 , 6 H 9/2 , and 6 H 11/2 transitions of Sm 3+ ion. PLE spectrum of CaSrNb 2 O 7 :Bi 3+ comes from the metal-to-metal charge- transfer (MMCT) Bi 3+ - Nb 5+ and the 1 S 0 → 1 P 1 and 3 P 1 transitions of Bi 3+ ion. CaSrNb 2 O 7 :Bi 3+ shows blue emission due to the 3 P 1 → 1 S 0 transition of Bi 3+ ion. The excitation spectrum of CaSrNb 2 O 7 :Sm 3+ , Bi 3+ contains that of CaSrNb 2 O 7 :Bi 3+ and CaSrNb 2 O 7 :Sm 3+ . CaSrNb 2 O 7 :Sm 3+ , Bi 3+ with excitation at 314, 363, and 406 nm glows orange and red-orange, and red emission, respectively. We observe the energy transfer from Bi 3+ to Sm 3+ ions and the effect of Bi 3+ on luminescence properties of Sm 3+ ion by their spectra. The optimal Sm 3+ and Bi 3+ concentrations are confirmed by the concentration dependent spectra. The energy level diagrams of Sm 3+ and Bi 3+ are used to analyze the luminous mechanism. The results are conducive to the development of new Sm 3+ and Bi 3+ co-doped luminescent materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xueyang Li,Hao Liu,Xiaoyan Xu,Bing Yang,Hong Yuan,Jingwei Guo,Fengting Sang,Yuqi Jin
We describe herein a flexible and tunable random laser made from a flexible poly(dimethylsiloxane) substrate. The substrate is prepared by casting via soft lithography from a lotus leaf to produce a micropapilla surface structure similar to that of a lotus leaf. The micropapilla provides efficient multiple scattering for the photons generated in the gain medium, and random lasing emerges because photons undergo closed-loop paths by scattering from three equilaterally arranged micropapillae. Given the diverse distribution of microscale features on the soft substrate, the random laser spectrum can be tuned by as much as 26.0 nm by changing the pump position. Furthermore, the random laser can be easily tuned by about 14 nm by flexing it, which modifies the micropapilla density and thereby changes the reabsorption strength of the laser dye. The photostability of the random laser is ensured by sealing the gain medium (i.e., dye solution) in a closed system. The results provide a promising method to realize a variety of laser-based applications such as optical biosensors on chips, microscale structural alteration detectors, flexible wearable devices, and multicolor (even white) random lasers.
研究领域:
光学材料
·
纳米技术
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Xiaoli Li,Yonglei Feng,Liwei Wang,Xianke Sun
A few of Bi 3+ /Mn 2+ doped Ba 9 La 2 Si 6 O 24 phosphors were synthesized in air by the solid state reactions at 1400 °C for the purpose of investigating their possible uses in the light-emitting diodes. The phase and luminescence performance were surveyed using the X-ray diffractometer and spectrometer, respectively. The results demonstrate the single phase and absorbance to the ultraviolet light of the synthesized phosphors. There is the Bi 3+ → Mn 2+ energy transfer, which gives rise to the tunable luminescence of the Bi 3+ /Mn 2+ codoped Ba 9 La 2 Si 6 O 24 phosphors. Upon the ultraviolet light excitation, the white light is generated by the Ba 9 La 2 Si 6 O 24 :0.03Bi 3+ /0.02Mn 2+ and Ba 9 La 2 Si 6 O 24 :0.03Bi 3+ /0.03Mn 2+ phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2023
·
IF 5.5
Qiu Huandi,Ran Qimeng,Bai Yun,He Wei,Zheng Li,Pan Cong,Jia Kun,Hu Yiguo
Lanthanide coordinating polymeric microparticles have witnessed increasing research interests during the past decades due to their versatile morphology and tunable fluorescent properties. Herein, we have synthesized an amidoximed block copolymer containing aromatic backbone and pendent amidoxime as well as carboxyl groups, which has been employed as the ligand to sensitize the intrinsic fluorescence emission of lanthanide ions of Tb3+ and Eu3+. Furthermore, the lanthanide coordinating polymeric microparticles showing tunable green and red emission fluorescence have been prepared via the emulsion confinement co-self-assembly of amidoximed polymeric ligands with Tb3+ and Eu3+. It is found that both the fluorescence emission and sizes of obtained fluorescent microparticles can be easily modulated in a wide range by tuning concentration of polymers and lanthanide ions, as well as emulsion evaporation temperature. Thanks to their tunable sizes (250–900 nm), fluorescence emission as well as presence of surface active functional groups, the present fluorescent microparticles would find potential applications in in-vitro detection, optical encoding and devices.
研究领域:
材料科学
·
化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2023
·Vol. 42
·期 11
·3787-3796
·
IF 8.8
Peng Chao-Yue,Wang Bo,Yuan Li-Fang,Hu Kai-Ge,Chen Geng,Wu Hao-Yi,Hu Yi-Hua,Jin Ya-Hong
Broadband near-infrared (NIR) light sources play a critical role in widespread applications such as advanced spectroscopy analysis and nondestructive testing. One of the most promising techniques is the fabrication of broadband NIR phosphor-converted light emitting diode (pc-LED). However, the purposeful design of a tunable ultra-broadband NIR-emitting phosphor in a single host is still a challenge. In this work, Ga 2 GeO 5 with two sites of six-coordinated [Ga1O 6 ] and five-coordinated [Ga2O 5 ] is chosen to host Cr 3+ , successfully producing tunable broadband NIR luminescence (680–1350 nm). It can be tuned largely from 828 to 970 nm with the full-width at half maximum (FWHM) varied from 208 to 258 nm just by simply adjusting the Cr 3+ -doping content. The tailoring of the Cr 3+ NIR spectral emission is ascertained to the site occupation preference and competition. The encapsulation of a prototype of NIR pc-LED with an output power of 29.5 mW@390 mA is conducted for the implementation of night-vision application. This work provides a novel broadband NIR phosphor by Cr 3+ -doping in both the six- and five-coordination field, meanwhile, further demonstrating the feasibility of discovering new host material with more than one crystallographic site for Cr 3+ to trigger tunable broadband NIR emission. Graphical abstract
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 21
·1900775
·
IF 7.125
Qianyi Guo,Minchen Wei,Zekun Zheng,Xiongjian Huang,Xiaoqian Song,Shao-Bin Qiu,Xiao-bao Yang,Xiaofeng Liu,Jianrong Qiu,Guoping Dong
Polymeric g-C 3 N 4 with controllable photoluminescence emission wavelength in the whole visible light range (450–650 nm) is synthesized through the one-step molecular doping during the thermal condensation process of g-C 3 N 4 conjugated framework, which opens up its application beyond the conventional catalysis scopes. By adjusting the doped content of hetero-molecules, the modified g-C 3 N 4 with the optical properties controlled according to the demand of practical applications can be facilely and largely obtained. It overcomes the limitation of the narrow adjusting range of conventional g-C 3 N 4 on optical properties and makes it become more promising for applications in solid-state displays. The corresponding multiple-color g-C 3 N 4 -based LED devices and the white-light LEDs with high quality can be obtained as supported by experiments and theoretical calculations. Moreover, the effect of doped molecule on the π-conjugated system of g-C 3 N 4 is systematically studied here, and the tunable luminescence mechanism is proposed.
研究领域:
材料科学
·
光学工程
·
化学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 7
·1249
·
IF 4.324
Jun Xiao,Cong Wang,Xin Min,Xiaowen Wu,Yangai Liu,Zhaohui Huang,Minghao Fang
Advances in solid-state white-light-emitting diodes (WLEDs) necessitate the urgent development of highly efficient single-phase phosphors with tunable photoluminescence properties. Herein, the Tm3+, Dy3+, and Sm3+ions are incorporated into the orthorhombic NaGdTiO4(NGT) phosphors, resulting in phosphors that fulfill the aforementioned requirement. The emission spectrum of Tm3+ions overlaps well with the adsorption spectra of both Dy3+and Sm3+ions. Under the excitation at 358 nm, the single-phase NaGdTiO4: Tm3+, Dy3+, Sm3+phosphor exhibits tunable emission peaks in the blue, yellow, and red regions simultaneously, resulting in an intense white-light emission. The coexisting energy transfer behaviors from Tm3+to Dy3+and Sm3+ions and the energy transfer from Dy3+to Sm3+ions are demonstrated to be responsible for this phenomenon. The phosphors with multiple energy transfers enable the development of single-phase white-light-emitting phosphors for phosphor-converted WLEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2009
·Vol. 19
·期 33
·5952-5955
·
IF 4.646
Yijie Lu,Hongwei Xia,Guangzhao Zhang,Chi Wu
Electrically tunable full color display photonic crystals (PCs) made of a thin film of block copolymer, polystyrene-b-poly(2-vinyl pyridine) (PS-b-P2VP), have been developed. The phase separation of PS and P2VP blocks leads to a one-dimensional periodic lamellar structure parallel to the surface of the thin film. In a solvent mixture of water and ethanol, each P2VP layer is swollen and partially charged. Applying a low voltage (<2.5 V) to such a thin film can lead to the repeatable expansion or contraction of each P2VP layer, depending on the direction and strength of the electrical potential. Such a variation of the lamellar periodicity leads to a full color display over a wide range from ultraviolet to near infrared. The advantages of such PCs are their facile preparation, low driving voltage and good durability, which make them potentially useful in information technologies.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Li Liang,Xuejia Hu,Yang Shi,Shukun Zhao,Qinghao Hu,Minhui Liang,Ye Ai
Microlens arrays (MLAs) are acquiring a key role in the micro-optical system, which have been widely applied in the fields of imaging processing, light extraction, biochemical sensing, and display technology. Compared with solid MLAs, liquid MLAs have received extensive attention due to their natural smooth interface and adjustability. However, manufacturing tunable liquid MLAs with ideal structures is still a key challenge for current technologies. In this paper, a novel and simple optofluidic method is demonstrated, enabling the tunable focusing and high-quality imaging of liquid MLAs. Tunable droplets are fabricated and self-assembled into arrays as the MLAs, which can be easily adjusted to focus, form images, and display different focal lengths. Tuning of MLAs’ focusing properties (range from 550 to 5370 μm) is demonstrated by changing the refractive index (RI) of the droplets with a fixed size of 200 μm, which can be changed by adjusting the flow rates of the two branch streams. Also, the corresponding numerical apertures of the MLAs range from 0.026 to 0.26. Furthermore, the MLAs’ functionality for microparticle imaging applications is also illustrated. Combining the MLAs with a 4× objective, microparticle imaging is magnified two times, and the resolution has also been improved on the original basis. Besides, both the size and RI of the MLAs in an optofluidic chip can be further adjusted to detect samples at different positions. These MLAs have the merits of high optical performance, a simple fabrication procedure, easy integration, and good tunability. Thus, it shows promising opportunities for many applications, such as adaptive imaging and sensing.
研究领域:
光学
·
微流控技术
·
成像技术
·
生物传感
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）