- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Solution-processed, top-emitting, microcavity polymer light-emitting diodes for the pure red, green, blue and near white emission
摘要： Top-emitting microcavity polymer light-emitting diodes (TMPLEDs) are of great significance for active matrix PLED displays with high color purity. However, the complex device structures of high efficiency microcavity organic light-emitting diodes fabricated by the full vapor deposition technology are not suitable to the solution processed PLEDs. The solution-processed TMPLEDs with simple device structures are promising candidates as the large-area, mass production display techniques. In this work, three strategies were used to apply microcavity into PLEDs: (1) double Ag electrodes performed as the mirrors of cavity, instead of multi-layer Bragg reflector, which simplified the device structure and fabrication process; (2) three solution processed functional layers were specially designed for avoiding the inter-infiltration between the different solution and improve the interface contacts; (3) high order microcavities were utilized according to the optical simulation results, in which thick EMLs benefited to thickness control and reproductivity. As results, the full-color emission including pure red, green, blue was realized, and quasi-white light was also achieved from single polymer emitting material. The achievement of color purity always sacrifices part of current efficiency (CE) due to the spectra narrowing, while the higher CE of green TMPLED (10.08 cd/A) than that of non-cavity PLED (∽8.60 cd/A) cast lights on the future improvement.
关键词： Top-emitting,Interface Engineering,Color Tuning,Polymer Light-Emitting Diodes,Solution-processed,Microcavity
更新于2025-09-16 10:30:52
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The Enhanced Sensitivity of a Porous Silicon Microcavity Biosensor Based on an Angular Spectrum Using CdSe/ZnS Quantum Dots
摘要： To improve the detection sensitivity of porous silicon microcavity biosensors, CdSe/ZnS quantum dots are used to label complementary DNA molecules for the refractive index amplification and angular spectrum method for detection. In this method, the TE mode laser is used as the detection light and the light source is changed into a parallel beam by collimating and expanding the beam, which illuminates the PSM surface and receives the reflected light from the PSM surface through the detector. The angle corresponding to the weakest reflected light intensity before and after the biological reaction between probe DNA and complementary DNA of different concentrations labeled by quantum dots was measured by the detector, and the relationship between the angle change before and after the biological reaction and the complementary DNA concentration labeled by quantum dots was obtained. The experimental results show that the angle change increases linearly with increasing complementary DNA concentration. The detection limit of the experiment, as determined by fitting, is approximately 36 pM. The detection limit of this method is approximately 1/300 of that without quantum dot labeling. Our method has a low cost because it does not require the use of a reflectance spectrometer, and it also demonstrates high sensitivity.
关键词： refractive index amplification,angular spectrum,quantum dot,porous silicon microcavity
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Continuously Tunable Fano Resonance Filter in a Fiber Taper Coupled Conical Microcavity
摘要： A conical microresonator with cone half-angle of ~10-5 rad is fabricated from a single mode fiber by a chemical etching method. Fano resonance with EIT-like spectrum is generated in a thin fiber taper coupled conical microcavity. Such the Fano spectrum can be used as the bandpass optical filter. Also, the central wavelength of the filter can be tuned continuously by displacing the fiber taper along the axis direction of the conical microcavity. The quality factor and extinction ratio of the optical filter could be up to 7×104 and 11.4dB. And the wavelength tunable coefficient is 0.22nm/mm.
关键词： Fano Resonance,Conical Microcavity,Optical Filter
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Liquid Crystal Tunable Narrow Linewidth Filter Based On Subwavelength Gratings Reflector
摘要： We present a electro-tunable liquid crystal (LC) filter consisting of a DBRs and SWGs reflectors which enables uniform alignment of LC. The filter achieve a wide-continuous tuning range of 60 nm and a linewidth of less than 1 nm.
关键词： optical microcavity,subwavelength grating,liquid crystal,tunable
更新于2025-09-16 10:30:52
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Transition Between Exciton-Polariton and Coherent Photonic Lasing in All-Inorganic Perovskite Microcuboid
摘要： All-inorganic lead halide perovskites are ideal platforms to investigate the fundamental physics of the light-matter interactions, due to their strong oscillator strength at room temperature and various microstructures. In this paper, we investigated strong exciton-photon coupling and coherent photonic lasing in a same high-quality self-assembled CsPbBr3 perovskite microcuboid grown by a chemical vapor deposition method. The vacuum Rabi splitting of polariton up to 309 meV, and the exciton-like and photon-like components in low polariton states at different cavity-exciton detuning, were revealed by angle-resolved photoluminescence spectra at room temperature. Moreover, we realized a coherent photonic lasing with a high quality-factor (4153) and narrow linewidth (0.13 nm) in the microcuboid above threshold (16 μJ/cm2), originated from population inversion. Significantly, the interference pattern of the coherent lasing through the Young's double-slit interference method based on far-field Fourier optical system, directly indicate the parity (odd) of the lasing mode and the asymmetric electric-field distribution in the CsPbBr3 microstructure. Our work demonstrates for the first time a transition from the strong coupling regime (vertical Fabry–Pérot oscillation) to weak coupling regime (lateral Fabry–Pérot oscillation) in such self-assembled microcuboid under the competition between gain and internal loss. Based on this mechanism, a considerable promise is expected to enrich the functions of micro-nano structure photoelectric devices by precisely controlling the quality-factor and gain of such microstructure.
关键词： Exciton-polaritons,Young's interference,Perovskite microcuboid,Photonic lasing,Fabry–Pérot microcavity
更新于2025-09-16 10:30:52
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Highly Efficient and High Peak Transmittance Colorful Semitransparent Organic Solar Cells with Hybrid-Electrode-Mirror Microcavity Structure
摘要： Microcavity is an efficient approach to manufacture colorful semitransparent organic solar cells (ST-OSCs) with high color purity by tailoring the transmission spectrum to narrow peaks. However, in this type of colorful semitransparent devices, high power conversion efficiency (PCE) and high peak transmittance are not yet simultaneously achieved. This paper proposes a new type of microcavity structure to achieve colorful ST-OSCs with both high PCE and high peak transmittance, in which hybrid Au/Ag electrode is used as mirror and WO3 as spacer layer. Firstly, it is demonstrated that the hybrid Au/Ag electrode mirror brings about an improvement of 7.7% and 5.5% for PCE and peak transmittance respectively, when compared with those of the reference devices using Ag electrode mirror. Specifically, the PCE of the optimized devices reaches the satisfactory value of over 9%, and the peak transmittance is over 25%. This value of PCE is the highest one reported so far for the microcavity-based ST-OSCs with the same peak transmittance. Secondly, it is demonstrated that the second-order resonance of the microcavity can be used to improve the color purity of green ST-OSCs by narrowing the transmission peak and the combination of the second-order and third-order resonance can be used to construct colorful ST-OSCs with mixed colors. Thus, a novel approach is developed to tune the color of ST-OSCs, which is based on high-order resonance modes of the microcavity.
关键词： transparency,color mixing,color tunability,semitransparent organic solar cells,interface optimization,hybrid Au/Ag electrode,microcavity,efficiency
更新于2025-09-12 10:27:22
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An Erbium-Doped Fiber Whispering-Gallery-Mode Microcavity Laser
摘要： A kind of whispering-gallery-mode (WGM) micro-cavities has been fabricated by melting a corroded erbium-doped fiber with a fiber-fusion splicer. The quality factor (Q) value of the microcavity can reach as high as 3×107. The microcavity is pumped by a wavelength-tunable laser source, and due to the high-Q characteristics, the laser threshold can be as low as 21.2 μW in a 60-μm-diameter microsphere-like cavity. By tuning the frequency of the pump laser at 1485 nm with 19.6 GHz, we can tune the WGM microcavity laser by 17.3 GHz around 1578.25 nm.
关键词： Erbium,whispering gallery mode (WGM),microcavity,microlaser
更新于2025-09-12 10:27:22
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Effect of second-order nonlinearity on quantum coherent oscillations in a quantum dot embedded in a doubly resonant-semiconductor micro-cavity
摘要： The quantum Rabi oscillations in a coherently driven quantum dot embedded in a high-Q doubly resonant semiconductor micro-cavity in the presence of a strong second-order nonlinear medium is investigated theoretically. It is shown that the χ(2) nonlinearity effect the Rabi oscillations in a significant manner.
关键词： Rabi oscillation,Semiconductor microcavity,Second order nonlinearity
更新于2025-09-12 10:27:22
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Design of parallel-connected polymer tandem solar cells using efficient low bandgap PTB7-Th:PC71BM blend
摘要： Parallel-connected tandem cells adopting a highly efficient donor polymer, PTB7-Th, combined with acceptor fullerene PC71BM as the back sub-cell was introduced to further improve the performance of polymer solar cells. Design of the device architecture was investigated using modeling and simulation methods based on the transfer matrix formalism. To optimize the device structure, detailed analysis of the effect of active layer thickness, different device structure, and transparent Ag intermediated electrode on the short-circuit current density has been studied. It was found the long-wavelength absorption in the top-illuminated ITO-free back cell was significantly enhanced due to the resonant microcavity effect, leading to an efficient utilization of the incident light and increased photocurrent. Giving these advantages, the power conversion efficiency of the parallel homo-tandem cell was estimated to be ~ 11%, which was ~ 15% higher than that of a single cell of PTB7-Th. Moreover, the maximum achievable current density and the corresponding optimum active layer thickness of the sub-cells varied a little as the thickness of ultrathin Ag layer was changed, indicating that parallel connection architecture provided more freedom in the design and optimization for high-performance tandem solar cells.
关键词： PC71BM,Polymer solar cells,Microcavity effect,Transfer matrix formalism,PTB7-Th,Parallel-connected tandem cells
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Loss-Induced Resonant Refractive Index Sensing using Total Internal Reflection Phase Shift
摘要： Refractometry has a variety of applications in chemistry, biotechnology, or food industry. A number of sensor systems are available to analyze the refractive index of liquid solutions or even biological tissue. We present a novel technique that aims at recording local distributions of refractive indices. The approach relies on the phase shift upon total internal reflection (TIR) and uses an extremely short Fabry-Pérot microcavity of less than 3 μm effective length as the key element to precisely measure refractive indices at less than 100 μm spatial resolution.
关键词： Fabry-Pérot microcavity,Total Internal Reflection,Refractometry,Refractive Index Sensing
更新于2025-09-12 10:27:22