Biomicrofluidics
·
2016
·Vol. 10
·期 3
·
IF 2.708
Morton J. A. S.,Bridle H.
Microfluidics has shown rapid growth in both research and development and offers significant commercialisation potential for biomedical and diagnostic applications in particular. However, there is a lack of awareness of microfluidics outside the field of study, and few dedicated educational programmes are available. While many topics incorporate microfluidics teaching, reported initiatives in the literature have not yet taken a problem based learning (PBL) approach to the delivery of practical sessions. The educational approaches already reported typically focus upon production and testing of pre-determined device designs for specific applications, using a “recipe” style of lab teaching. Here, we report on a newly designed lab section of a microfluidic teaching component utilising problem based learning (PBL) to involve the students in all aspects of design, manufacture, and performance characterisation of microfluidic solutions. Details of the lab design and development are given enabling others to replicate the lab structure described here or use it as a basis for the design of similar PBL microfluidics teaching labs. A key focus of the work has been the evaluation of the student experience, and the results of a survey indicate a high degree of student satisfaction and skills development due to the PBL approach.
研究领域:
生物医学工程
·
教育学
·
微流控技术
✓ 已验证
DOI
PubMed
高影响因子
SOFT MATERIALS
·
2017
·
IF 1.101
Lingli Ni,Mei Wu,Feng Chen,Irena Deroche,Abraham Chemtob
A visible light-mediated sol–gel process can promote the ordering of hexylene, octylene, and decylene-bridged polysilsesquioxane (SQ) with very simple organosilane building blocks having only a short alkylene bridging group: (CH3O)3SiCnH2nSi(OCH3)3 (n = 6, 8, 10). Photocondensation and self-assembly of films are promoted through exposure to a light-emitting diode (LED; 405 nm). The solvent-free synthesis involves very low light intensity (0.1 mW/cm2) and a minimum amount of photoacid generator (PAG; 0.5 wt%) acting as a photocatalyst. X-ray diffraction (XRD) and scanning electron microscopy (SEM) prove the high level of organization, while real-time Fourier transform infrared spectroscopy shows conformational ordering of alkylene chains throughout irradiation. Molecular modeling reveals a multilayer structure based on the stacking of a single polysiloxane chain, with organic groups attached to adjacent Si atoms showing up and down orientation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2016
·
IF 0
D.C. Huang,You Fu Zhou,Chao Quan,Wen Tao Xu
New luminescent oxynitridosilicates doped with Eu2+ and Ce3+ have been synthesized by solid state reaction method at 1450oC. The host has the general formula La1-ySr1-xSiO3N: (yCe3+, xEu2+), which presents greenish-yellow or orange photoluminescence under UV/blue excitation. Remarkable long wavelength emissions centered above 565 nm were observed for the Ce3+ activated oxynitridosilicates, with compositions LaSrSiO3N:0.02Ce3+, and LaSrSiO3N:(0.02Ce3+, 0.02Eu2+) for 598 nm due to a significant amount of energy transfer from Ce3+ ions to Eu2+ ions. By combining the title LaSrSiO3N:(Ce3+, Eu2+) phosphors with the 450 nm InGaN chip, a broad range of white light with correlated color temperatures of ~3500 K and color-rendering index of 92 can be generated, demonstrating their promising practical applicability to the warm-white light-emitting diodes.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
Laser & Photonics Reviews
·
2022
·Vol. 16
·期 7
·2200012
·
IF 10.947
Hao Suo,Yu Wang,Xiaoqi Zhao,Xin Zhang,Leipeng Li,Kuiwen Guan,Wenge Ding,Panlai Li,Zhijun Wang,Feng Wang
The rapid development of near-infrared (NIR) spectroscopic techniques has greatly stimulated the discovery of novel broadband NIR-emitting phosphors as advanced light sources. Herein, a novel double-perovskite phosphor La 2 MgHfO 6 :Cr 3+ /Yb 3+ that displays ultra-broadband NIR emissions with a full-width at half maximum (FWHM) of 333 nm is reported. The remarkable luminescence property stems from the multiple crystallographic sites, relatively weak crystal field, and efficient Cr 3 -to-Yb 3+ energy transfer (ET). The site occupation of Cr 3+ is elaborately verified by the Rietveld refinement and first-principles calculation. By controlling the ET process, the internal/external quantum efficiency (IQE/EQE), bandwidth, and thermal stability of NIR emissions are substantially improved. The as-prepared phosphors are further integrated into a miniaturized NIR light-emitting diode (LED) package, demonstrating superior performance in rapid nondestructive detection of structural failure in thin electronic cables. The results described here provide a novel pointcut for designing broadband NIR-emitting phosphors with desired optical properties toward applications in industrial inspection and medical diagnosis.
研究领域:
材料科学
·
光学工程
·
工业检测
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 14
·18513-18519
·
IF 5.6
Haixia Zheng,Zhongxiang Shao,Faling Ling,Li Li,Guotao Xiang,Yongjie Wang,Xianju Zhou
The effectiveness of near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) is primarily determined by the NIR phosphors. Unfortunately, there is still a shortage of effective broadband near-infrared luminescent materials which emit NIR light with wavelengths exceeding 800 nm. Herein, Cr 3+ doped SrGe 4 O 9 phosphors were prepared by a high-temperature solid-state reaction. The phosphor exhibits a wide NIR emission spanning from 650 to 1250 nm, with the center located at approximately 846 nm. It demonstrates a full width at half maximum (FWHM) of 190 nm and a quantum yield of 66.9 % when excited by the blue light at 442 nm. When subjected to 373 K, the luminescence intensity of the phosphor remains above 80 % of the value at room temperature . The application in night vision and biological imaging have been realized by the prepared SrGe 3.99 O 9 : 1%Cr 3+ phosphor combined with a commercial 440 nm blue chip.
研究领域:
材料科学
·
光电子学
·
光子学
·
发光材料
·
固态照明
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Xiaoyu Zhao,Wenlong Jia,Huiqiang Wang,Guihua Yan,Yong Sun,Xing Tang,Xianhai Zeng,Lu Lin
Perovskite quantum dots (PQDs) has been attracted enormous attention in optoelectronic fields, especially as highly efficient narrow-band phosphors for lighting and next-generation display devices, attributed by high photoluminescence quantum yield, tunable emission colors and high color purity. However, poor stability seriously impeded their practical applications. Here, we described a robust-stable CH 3 NH 3 PbBr 3 PQDs/Ethyl Cellulose (EC) composite films with adjustable amounts of PQDs by ligand-assisted precipitation EC in one-step. The key to the preparation of CH 3 NH 3 PbBr 3 PQDs/EC composite film is to achieve the supersaturated recrystallization of CH 3 NH 3 PbBr 3 PQDs and the dissolution of EC in toluene. Combined with experimental results and investigated material characterization unveiles that the synthetic composite film possessed very high transparency, excellent down-conversion luminescence function and strong specific absorption in the ultraviolet region, which benefits form the excellent stability & hydrophobicity of EC, and long-term stable fluorescence performance in air or water under the protection of EC. Moreover, the fluorescence intensity maintained significantly stablility even after 1000 folds. In addition, the CH 3 NH 3 PbBr 3 PQDs/EC composite film exhibited excellent flexibility, which made our composite film showed great potential in the field of flexible display.
研究领域:
光学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2026
·
IF 17.3
Kai Jia,Yuewen Mu,Fangjun Huo,Jingying Zhou,Caixia Yin
The preparation of broadband near-infrared phosphors has emerged as a frontier research area, presenting significant scientific importance alongside considerable technical challenges. Cr3+-doped garnet-type near-infrared phosphors have garnered widespread attention due to their ability to be excited by inexpensive blue chips. However, existing phosphors suffer from drawbacks such as narrow full width at half-maximum and short emission wavelengths. This study employs a high-temperature solid-state method to synthesize a garnet-type phosphor, La3In2Ga3O12:Cr3+. XRD patterns confirm that the sample exhibits a garnet structure with the space group Ia3¯d. Excited at 490 nm, this phosphor exhibits strong emission within the 700–1000 nm range, with an emission peak at 826 nm and full width at half-maximum of 149 nm. This study employed a fluxing agent strategy to enhance crystallinity, thereby improving the phosphor in luminescence and ultimately identifying H3BO3 as the optimal fluxing agent. Monitoring the luminescence intensity at various temperatures revealed that at 423 K, the intensity remained at 50% of the initial value, yielding an activation energy of 0.340 eV. Finally, by fabricating the phosphor with a blue 485 nm LED chip into a near-infrared LED device, a luminous efficiency of 9.72%@20 mA was achieved, with an output power reaching 978 mW@320 mA. This device demonstrates promising applications in night vision security screening, information recognition, and biological imaging.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.6
YinFei Liu,Wei Zhu,Feifei Huang,Renguang Ye,Hongping Ma,Youjie Hua,Shiqing Xu
Achieving high color rendering index (CRI) in white LEDs requires the use of red-emitting phosphors. With the expanding application range of high-power LEDs and laser diodes, the demand for thermal stability of phosphor has become increasingly stringent. In this study, a series of novel red-emitting phosphors Sr 2- x LiAlO 4 : x Sm 3+ ( x = 0.01–0.18) were synthesized by a solid-state reaction. Under 407 nm excitation, this phosphor displays a prominent red emission (608 nm) characterized by the dominant 4 G → 6 H transition of Sm 3+ . The phosphor maintains 98.5% of its luminescence intensity at 200°C compared to room temperature (30°C). This indicates that Sr 1.91 LiAlO 4 : 0.09Sm 3+ phosphor has excellent thermal stability, which is attributed to the high rigidity of its crystal structure. A white LED was fabricated by coating a 365 nm near-UV chip with a blend of phosphors: the red Sr 1.91 LiAlO 4 : 0.09Sm 3+ , a yellow-green (Sr, Ba) 2 SiO 4 : Eu 2+ and a blue BaMgAl 10 O 17 : Eu 2+ phosphors. The device emits white light with a high color rendering index (CRI) of 94.4 and a correlated color temperature (CCT) of 5625 K. The results demonstrate the promising application potential of the Sr 1.91 LiAlO 4 : 0.09Sm 3+ red phosphor in white LED applications.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 37
·12581-12589
·
IF 7.393
Yixuan Liu,Lulu Zhang,Xuemi Long,PanPan Jiang,Chong Geng,Shu Xu
Perovskite nanocrystals (PNCs) are promising luminescent materials but suffer severe stability issues due to their ionic surface nature. SiO2 encapsulation is widely adopted for stabilizing PNCs in LED lighting and display applications. However, PNCs commonly lose ligands during the SiO2 encapsulation process, leading to fluorescence quenching and agglomeration. Here, CsPbBr3 PNCs with lead-carboxylate capping motif, which shows extraordinary ethanol and moisture resistance, were developed to facilitate fast and controlled growth of PNC–SiO2 nanocrystals using ethanol to accelerate the hydrolysis of tetramethoxysilane. Surface analysis revealed the preservation of the original carboxylate ligands after the reaction. Carboxylate and SiO2 form uniform dual-encapsulation that provides PNCs with superior air and water resistance, excellent photoluminescence maintenance, and high miscibility in silicone resin. Finally, saturated green LED and white-light LED with a wide color gamut were fabricated through on-chip packaging of the PNC–SiO2 on the blue LED chip. LEDs retained >85% of their light intensity after continuous illumination for 1000 h, demonstrating the high potential of the encapsulation method and the materials in light-emitting applications.
研究领域:
材料科学
·
光学工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2022
·Vol. 16
·期 9
·2200020
·
IF 10.947
Shuhang Tian,Zhenguo Shi,Yongsheng Sun,Pengyu Zhang,Sheng Wu,Dongdan Chen,Puxian Xiong,Qi Qian,Zhongmin Yang
Though widely applied in light-emitting diode (LED) lighting and X-ray detection, respectively, rare-earth ions doped phosphor and scintillating single crystals still face many challenges in practicalities, like aging of package material and difficulty to construct tiny array structure. Using phosphate glass as the host is quite beneficial for solving these problems while enabling distinguished luminescence. Therefore, Eu 3+ and Tb 3+ doped phosphate glasses which, respectively, show strong red/green emissions are researched. Superior thermal stabilities (78.69% and 89.35% emission intensities remain at 150 °C) and high internal quantum efficiencies (87.3% and 68.6%) are found to guarantee the excellent photoluminescence performances. The brilliant X-ray excited luminescence properties are demonstrated by general 19.49% and 34.74% integrated emission intensities of that of commercial Bi 4 Ge 3 O 12 single crystal scintillator with the change of X-ray power. Meanwhile, Tb 3+ doped scintillating fiber is drawn. Finally, excited by 380 nm LED, color manipulation and white light generation are achieved in LEDs with a structure of stacked emitting layers (mainly Eu 3+ and Tb 3+ doped phosphate glasses). Many of the as-constructed white LED's performance parameters are much better than the commercial white LED. These results show that Eu 3+ and Tb 3+ doped phosphate glasses possess promising potential in LED lighting and X-ray detections.
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
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 9
·2619-2630
·
IF 4
Xuejiao Wang,Xiaowen Feng,Maxim S. Molokeev,Huiling Zheng,Qiushi Wang,Chunyan Xu,Ji-Guang Li
Phosphors that exhibit tunable broadband emissions are highly desired in multi-functional LEDs, including pc-WLEDs and pc-NIR LEDs. In this work, broadband emissions were obtained and modulated in the unexpectedly wide spectral range of 517–609 nm for (Lu0.99−xGdxBi0.01)2WO6 phosphors by tuning the Gd3+ content (x = 0–0.99). The effects of Gd3+ doping on phase constituents, particle morphology, crystal structure, and photoluminescence were systematically investigated. Broadband green emission was obtained from Gd3+-free (Lu0.99Bi0.01)2WO6 phosphors (x = 0), whose emission intensity was enhanced by 50% with 5 at% Gd3+ (x = 0.05). The phase transition happened when x > 0.50 and the broadband red-NIR emission was obtained when x = 0.75–0.99. Three luminescence centers were proved to be responsible for the broadband green emissions via crystal structure, spectral fitting and fluorescence decay analysis. A pc-WLED with a high color rendering index (Ra = 91.3), a stable emission color, and a low color temperature (3951 K) was fabricated from the (Lu0.94Gd0.05Bi0.01)2WO6 broadband green phosphor, and an LED device that simultaneously emits high color rendering index white light and NIR light was obtained with the (Gd0.99Bi0.01)2WO6 broadband red-NIR phosphor. Night vision and noninvasive imaging were also demonstrated using the latter LED device.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhenyu Wang,Xinyu Shen,Chengyuan Tang,Xin Li,Junhua Hu,Jinyang Zhu,William W. Yu,Hongwei Song,Xue Bai
Oleylamine and oleic acid are common organic capping ligands used in the hot injection preparation of perovskite quantum dots (QDs). Their labile nature is responsible for the poor colloidal stability and conductivity that affect the performance of perovskite QD light-emitting diodes (LEDs). We introduced 4-trifluoro phenethylammonium iodide (CF3PEAI) directly in the synthesis and found that CF3PEAI efficiently modified the I– vacancy defects on the QD surface and partially substituted the surface capping ligand oleylamine. The strong electron pulling ability of F in CF3PEAI results in a more positive −NH3+ terminal compared to that of PEAI, which promotes tight bonding of CF3PEAI on the surface of CsPbI3 QDs. As a result, we achieved bright QDs with a photoluminescence quantum yield of 92% and efficient red LEDs. The maximal luminance was improved to 4550 cd m–2 for 685 nm red light, which was nearly 4.6-fold of the LEDs with plain CsPbI3 QDs. Additionally, the peak external quantum efficiency reached 12.5%.
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
危险品化学品经营许可证（带存储）