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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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[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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Planarization of Slot-Die Coated Multilayer Stripes via Pre-drying by a Heating Roll for Organic Light-Emitting Diodes
摘要： Micro-patterning of single-layer thin films in the cross-web (transverse) direction is feasible using a slot-die coating system. For its practical applications in organic light-emitting diodes (OLEDs), however, the fabrication and planarization of multilayer thin-film stripes are indispensable. We have coated multilayer stripes using an aqueous poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) and non-aqueous poly(N-vinylcarbazole) (PVK) and planarized them via pre-drying by a heating roll in a roll-to-roll slot-die coating system. It is demonstrated that the PEDOT:PSS stripe can be planarized at a pre-drying (heating roll) temperature of 40 °C. At higher temperatures, it is found that there appear the evaporation-induced inward and/or outward capillary flows depending on the wet film thickness. Using a low-boiling-point solvent, the PVK stripe coated atop the planarized PEDOT:PSS stripe is shown to be planarized at a pre-drying temperature of 65 °C, the step coverage and thickness uniformity by which are substantially enhanced. Such a planarization scheme also brings in the positive effect on the surface morphology of those stripes. To verify the planarization effect at the device level, we have fabricated phosphorescent OLED stripes. Without planarization, the light-emitting area shrinks and a spot with strong light emission appears, increasing the probability of a short circuit in OLEDs. With planarization, however, we can achieve brighter light emission from OLED stripes with high inter-stripe emission uniformity.
关键词： planarization,Slot-die coating,organic light-emitting diode,heating roll,multilayer stripes
更新于2025-09-11 14:15:04
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Synthesis and Properties of New Imidazole Derivatives Including Various Chromophore for OLEDs
摘要： Two new blue compounds were successfully synthesized by introducing phenanthroimidazole group as a side group into pyrene, a chromophore with good luminous efficiency: 1-(4-(10-(naphthalen-2-yl)anthracen-9-yl)phenyl)-2-(pyren-1-yl)-1H-phenanthro[9,10-d]imidazole (NA-PPI) and 1-(4’-(9H-carbazol-9-yl)-[1,1’-biphenyl]-4-yl)-2-(pyren-1-yl)-1H-phenanthro[9,10-d]imidazole (CP-PPI). The optical and electroluminescence properties of newly synthesized materials were measured. Both materials emit blue or sky-blue photoluminescence in the film state and have a high PLQY value of over 80% in solution state. The synthesized materials were applied as EML in non-doped devices, and high efficiency of 3.51 cd/A and EQE of 2.39% in CP-PPI device were achieved.
关键词： pyrene,blue emission,Organic light-emitting diode,imidazole,fluorescence
更新于2025-09-11 14:15:04
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Uncommon Intramolecular Charge Transfer Effect and Its Potential Application in OLED Emitters
摘要： Planarized intramolecular charge transfer(PLICT) state can facilitate the fluorescence process thanks to the relative excellent planarity. Recently, we have discovered that the excited state quinone -conformation induced planarization(ESQIP) occurring on tetraphenylpyrazine(TPP) based derivatives could furnish them with PLICT feature. Unlike to the well-known intramolecular charge transfer, strengthening the electron-donating nature on the donor(D) moiety did not impair the PLICT. The calculation results showed that planarization of the TPP based compounds scarcely accompanied with energy wastage while amount of energy was required for the torsion on geometries. In the polar solvents, the energy consumption for planarization could further decrease, but that for twisting structure would increase. To take advantage of the transformation of the frontier orbitals’ distribution, the PLICT type materials would perform a potential application on organic light-emitting diodes(OLEDs).
关键词： Tetraphenylpyrazine,Organic light-emitting diode,Planarized intramolecular charge transfer,Excited state quinone-conformation induced planarization
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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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
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Electroluminescence and contact formation of 1-(pyridin-2-yl)-3-(quinolin-2-yl)imidazo[1,5-a]quinoline thin films
摘要： Contact formation was investigated for the recently introduced organic light emitting molecule 1-(pyridin-2-yl)-3-(quinolin-2-yl)imidazo[1,5-a]quinoline (PCIC) by in situ atomic force microscopy (AFM) and Kelvin probe force microscopy (KPFM) during physical vapor deposition (PVD). The hole conductors poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and poly(9-vinylcarbazole) (PVK), as well as the electron conductor bathocuproine (BCP) were used. Different growth modes were found for PCIC films and charge carrier injection barriers were identified. Based on these findings, electroluminescent layer structures with an imidazo[1,5-a]quinoline were prepared for the first time and effects of contact formation on radiative recombination were studied. Depending on the chosen contact material, blue PCIC electroluminescence or significantly red-shifted emission presumably caused by electroplex formation could be obtained. Using PCIC in a host-guest system within a matrix of PVK and 1,3-bis[5-(4-tert-butylphenyl)-2-[1,3,4]oxadiazolyl]benzene (Oxd-7), led to blue emission at improved luminescence. The studied interactions of PCIC with typical contact materials reveal the potential and limitations to use PCIC as an electroluminescent material.
关键词： Kelvin probe force microscopy,Electroluminescence,Contact formation,Organic light-emitting diode
更新于2025-09-10 09:29:36
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A review on low-molar-mass carbazole- based derivatives for organic light emitting diodes
摘要： Organic light emitting diodes (OLEDs) have attracted a great deal of attention within academia and industry because of their potential applications in flat panel displays and solid-state lighting technologies. Among all low-molar-mass derivatives under investigation in OLEDs field, carbazole-based materials have been studied at length for their interesting physical properties, including good charge injection and transport, electro-luminescence, improved thermal and morphological stabilities as well as film forming properties. In addition, the relatively high triplet energy level of some substituted carbazoles makes them suitable candidates to design hosts for wide bandgap triplet emitters such as blue dopants. The article is written from structural organic chemist's point of view and is divided in several parts: V-shaped 3(2)-substituted carbazoles and derivatives with 9-carbazolyl rings, star-shaped 3,6(2,7)-substituted carbazoles and branched twin derivatives containing (di)arylcarbazolyl fragments.
关键词： Amorphous material,Ionization potential,Glass transition temperature,Organic light emitting diode,Substituted carbazole,Hole transporting material
更新于2025-09-09 09:28:46
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[IEEE 2017 IEEE Workshop on Recent Advances in Photonics (WRAP) - Hyderabad (2017.12.18-2017.12.19)] 2017 IEEE Workshop on Recent Advances in Photonics (WRAP) - Effect of Moth-Eye Antireflective Coatings in Extraction of Far Field Intensity of an Organic Light Emitting Diode (OLED)
摘要： In this work, the OLED is modelled using Moth-eye Anti Reflective coatings to extract maximum far field intensity compared to Conventional OLED. Finite difference time domain method is used to simulate the OLED structure. The presented structure shows maximum far field intensity of 3.6μV/m.
关键词： Moth eye Antireflectors,Organic Light Emitting Diode,Total Internal Reflection
更新于2025-09-04 15:30:14