- 标题
- 摘要
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- 实验方案
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[IEEE 2018 IEEE Life Sciences Conference (LSC) - Montreal, QC, Canada (2018.10.28-2018.10.30)] 2018 IEEE Life Sciences Conference (LSC) - Design, Implementation, and Test of an Adiabatic Stimulation Back-End for Implantable Optical Stimulation Microsystems
摘要： This paper introduces a new circuit-level idea for driving optrodes in an optical stimulation system. Trying to make the stimulation circuitry energy efficient, the proposed idea is based on the basic concept of adiabatic circuits. Based on the idea proposed in this paper, a prototype stimulation circuit was developed and tested. The optical stimulation back-end also includes a micro-fabricated optrode array, specifically designed, developed, and tested for multi-channel optical stimulation in a semi-implantable optogenetic system.
关键词： optrode,optical stimulation,organic light-emitting diode (OLED),optogenetics,adiabatic circuits,LED driver
更新于2025-09-23 15:22:29
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24.3: <i>Invited Paper:</i> Printed Electrodes for All‐Solution‐Processed Inverted‐Structure OLEDs
摘要： A key enabling technology for all-printed organic light-emitting diodes is printing electrodes that can be used for anodes or cathodes for conventional or inverted device structures. In both device structures, the first bottom electrodes, which are either transparent or opaque depending on the device structure, are typically printed while the last top electrodes have been deposited by using a vacuum-based evaporation process because when the last top electrodes are fabricated by using a solution-based process, under organic layers are easily damaged during the fabrication process. Although so-called transfer printing process has been often reported for organic devices such as organic solar cells, it has been rarely applied for OLEDs. In addition, no fine patterning has been adopted in such printing processes. As part of our efforts towards all-printed OLEDs, inkjet-printed and/or transfer-printed, finely-patterned PEDOT:PSS electrodes have been investigated in our lab and most recent achievement will be reported in detail. In order to implement all-solution-processed OLEDs, we also studied the inverted-structure OLEDs, which showed comparable results to the conventional structure OLEDs with the vacuum-based deposited electrodes.
关键词： inverted structure,Organic light-emitting diode,OLED,PLED,inkjet-printing,transfer-printing,polymer light-emitting diode
更新于2025-09-19 17:13:59
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A review of highly reliable flexible encapsulation technologies towards rollable and foldable OLEDs
摘要： As the demand for flexible, rollable, and foldable displays grows, various state-of-the-art component technologies, including thin-film transistors (TFTs), electrodes, thin-film encapsulations (TFEs), and touch screen panels, have been developed based on organic light-emitting diodes (OLEDs) with flexible organic layers. Developing highly reliable flexible OLEDs is essential to realize flexible displays, but the flexible encapsulation technology still has technical difficulties and issues to be addressed. This review covers the recent developments in encapsulation technologies, particularly their material and structural designs, for highly reliable, flexible OLEDs. The solution concepts for the existing technical hurdles in flexible encapsulations are addressed. Among the various advanced flexible encapsulation technologies developed so far, neutral-axis engineering with a thin metal layer and a crack arrester is introduced.
关键词： organic light-emitting diode (OLED),Thin-film encapsulation (TFE),foldable,flexible,rollable
更新于2025-09-16 10:30:52
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A Temperature Compensation Method by Adjusting Gamma Voltages for High Luminance Uniformity of Active Matrix Organic Light-Emitting Diode Displays
摘要： In this paper, a temperature compensation method is proposed for active-matrix organic light-emitting diode (AMOLED) displays to achieve high luminance uniformity over a wide operating temperature range. The proposed temperature compensation method compensates for variation in OLED luminance according to temperature by adjusting the gamma voltages. To verify the proposed method, a built-in test circuit, which includes temperature sensors, current calculation block, current adjustment block, and gamma voltage generator, was fabricated using 90 nm complementary metal-oxide semiconductor process technology with 6 V high-voltage devices. The measurement results show that the proposed method achieves a high luminance uniformity with an OLED luminance variation of less than 1.54 cd/m2 over the temperature range of –45°C to 60°C. Therefore, the proposed temperature compensation method is suitable for AMOLED displays requiring high luminance uniformity.
关键词： gamma voltage,high luminance uniformity,temperature compensation,Organic light-emitting diode (OLED)
更新于2025-09-12 10:27:22
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Organic LED based light sensor for detection of ovarian cancer
摘要： Organic devices possess an interdisciplinary facet that can be utilized in the different fields; communication, memory devices, bio-degradable technology and sensor application owing to their robustness, light weight and low power requirements. The proposed work is focused on the development of a sensor application based on the organic LEDs for the diagnosis of ‘Ovarian Cancer’. Two organic LEDs: Multilayered OLED and triple hole block layer OLED are analyzed for utilization as light detector and light source in the sensing device for cancer detection. Multilayered OLED depicts excellent light detection qualities owing to lower electron hole recombination and it is six times better as compared to the triple hole block layer OLED. Therefore, it is used as the detector element in the sensing device. On the other hand, triple hole block layer OLED, is used as light source due to its high luminescence characteristics of 25,285 cd/m2. Further, a dual gate OTFT is used to drive the triple hole block layer OLED, which is utilized as the light source. DG OTFT in dual gate mode is 18% better compared to single gate mode. Thus DG-OTFT in dual gate mode is able to generate 18 volts at the terminals of the triple HBL OLED necessary for its operation. Thereafter, light detection is performed utilizing the OLED. Multilayered OLED depicted excellent light detecting capabilities. It is able to generate a cathode current of 29mA and 13mA at an incident wavelength of 420 and 440 nm, respectively, an essential requirement for present sensor application. Therefore, it presents a possibility to fabricate a portable fully flexible device for the screening and diagnosis of the ovarian cancer.
关键词： Ovarian Cancer,Triple Hole Block Layer (THBL) OLED,Dual Gate-Organic Thin Film Transistor (DG-OTFT),Bio-Medical Sensor,Organic Light Emitting Diode (OLED)
更新于2025-09-11 14:15:04
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White organic light-emitting diode (OLED) microdisplay with a tandem structure
摘要： Microdisplay is a key technology for realizing augmented reality (AR) and mixed reality (MR) devices, which have attracted much attention of late. Even though the operating voltage in the tandem structure is higher than that in the single structure, 2-stack tandem OLED exhibited 20,000 cd/m2 at 9 V, which is compatible with CMOS circuit driving. Due to its top-emitting geometry with a tandem structure, the OLED device with a well-controlled thickness exhibited a white spectrum with (0.26, 0.26) color coordinates. The pixel density of the fabricated microdisplay panel with a white tandem OLED was about 2350 pixels per inch, and the active area of the panel was 0.7 inch diagonally. The resolution of the panel was 1280 × 1024, corresponding to SXGA, and the maximal luminance was 3,000 cd/m2.
关键词： white OLED,tandem,Organic light-emitting diode (OLED),microdisplay
更新于2025-09-11 14:15:04
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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) - Evaluation of Plamsonic Enhancement and Quenching of Ag Nanoparticles in Organic Light-Emitting Diode
摘要： The utilization of localized surface plasmon (LSPR) to improve the yield of organic light emitting diode (OLED), has been subject of numerous publications and reports. Several enhancement mechanisms have been highlighted such as the increase of F?rster energy transfer, the enhancement of the OLED electroluminescence as well as the increase of the current I and the decrease of the turn-on voltage V [1,2]. Nevertheless, these mechanisms are still not completely studied and understood. One major problem of using metallic NPs is the inherent losses associated with their conductivity. Another important issue concerns the evaluation of their electrical and optical effects on the total yield enhancement. Besides, the LSPR wavelength and the distance of the metallic NPs from the OLED emitting layer (EML) are very important parameters for a maximum enhancement of the near-field-induced energy transfer between excitons and NPs LSPR. In fact, LSPR modifies the radiative and the non-radiative decay rates of adjacent emitters resulting in two competitive processes: the fluorophores radiation intensity enhancement and the non-radiative quenching of activated fluorophores on the NP metal surface. To obtain an overall enhancement, the resonance energy of the fluorophore and the LSPR should be carefully adjusted with an appropriate distance between the metal NPs and the emitter. In this work, we report a thorough investigation of Ag NPs randomly dispersed into a standard guest-host OLED (Alq3:DCM) by thermal evaporation during the OLED fabrication process. Mainly, we follow-up the interaction between the Ag-thin layer and the excitons by varying the position of Ag-NPs within the OLED stack (fig. 1). At each position of Ag-NPs, we compare the plasmonic-OLED performances to those of the reference one without NPs (zero line) and we bring a general analysis of the electroluminescence efficiency variation as a function of the position of Ag-NPs related to the excitons distribution within the OLED emitting layer. The experimental results allow us to draw the balance between the amplification and quenching due to the Ag-NPs. By considering the spatial distribution of the emission sites in the EML, we particularly, highlighted two competing effects: the LSPR amplification for large distances between the Ag-NPs and the emissive sites, and the quenching effect by metallic NPs for short distances between the Ag-NPs and the emissive sites. Nevertheless, other phenomena such as the influence of Ag-NPs on the charge carriers injection and transport as well as extraction effect should be also taken into account in order to thoroughly understand the effect of plasmonic nanoparticles on the OLED structure performance. Our study enable us to suggest a figure of merit giving the total yield as following (cid:75) (cid:97) σ. (cid:69)a. (cid:69)q. (cid:75)ex, where (cid:86) accounts for the electrical effects, (cid:69)a and (cid:69)b are LSPR amplification and plasmonic quenching, respectively and (cid:75)ex is related to the extraction effect. The weight of the previous parameters depends on the distance NPs-EML with three zones of interest: anode side, cathode side and nearby the EML. Two different physical phenomena are also to be considered on the side of the cathode and the anode (blue and green lines in fig.1), as well as the correlation between near and far field. These results are of a great interest in order to develop new generation of highly efficient OLED-based devices.
关键词： Ag nanoparticles,plasmonic enhancement,localized surface plasmon (LSPR),quenching,organic light emitting diode (OLED)
更新于2025-09-11 14:15:04
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High-triplet-level phthalimide based acceptors for exciplexes with multicolor emission
摘要： To provide high exciton utilization in organic light emitting diodes, phthalimide derivatives were designed and synthesized as exciplex-forming materials. Due to high triplet levels (2.92-3.11 eV) and ionization potentials (7.18-7.29 eV), the developed phthalimide derivatives were found to be not only appropriate accepting materials for the formation of different color exciplexes but also as bifunctional materials with a satisfactory hole and exciton-blocking abilities. Solid-state blends of the synthesized phthalimides as acceptors and a carbazole containing donors showed exciplex emission. Bimolecular blends exhibited multicolor exciplex emission which covered a visible spectrum from sky-blue to red colors, depending on the donor used. However, the photoluminescence quantum efficiencies of the studied exciplex-forming systems were found to be sensitive to the molecular design of the phthalimides. Acceptor with para- substituted phthalimide showed better exciplex-forming properties in comparison to other compounds. Exciplex-forming blend of (2-(4-benzoylphenyl)isoindoline-1,3-dione) as an acceptor and 1,3-di(9H-carbazol-9-yl)benzene (mCP) as a donor showed the most efficient sky-blue emission with small singlet-triplet splitting (0.06±0.03eV). Such exciplex-forming molecular mixture was implemented as the light-emitting material in the sky-blue organic light emitting diodes which showed the brightness of 2500 cd m-2 and maximum external quantum efficiency of 2.9 % due to the employment of both singlet and triplet excitons.
关键词： exciplex,phthalimide,acceptors,organic light emitting diode (OLED),thermally activated delayed fluorescence (TADF)
更新于2025-09-10 09:29:36